Blame - lib/CodeGen/SelectionDAG/TargetLowering.cpp - platform/external/llvm

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Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	1	//===-- TargetLowering.cpp - Implement the TargetLowering class -----------===//
Misha Brukman	f976c85	2005-04-21 22:55:34 +0000	[diff] [blame]	2	//
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	3	// The LLVM Compiler Infrastructure
				4	//
Chris Lattner	4ee451d	2007-12-29 20:36:04 +0000	[diff] [blame]	5	// This file is distributed under the University of Illinois Open Source
				6	// License. See LICENSE.TXT for details.
Misha Brukman	f976c85	2005-04-21 22:55:34 +0000	[diff] [blame]	7	//
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	8	//===----------------------------------------------------------------------===//
				9	//
				10	// This implements the TargetLowering class.
				11	//
				12	//===----------------------------------------------------------------------===//
				13
				14	#include "llvm/Target/TargetLowering.h"
Chris Lattner	af76e59	2009-08-22 20:48:53 +0000	[diff] [blame]	15	#include "llvm/MC/MCAsmInfo.h"
Chris Lattner	beeb93e	2010-01-26 05:58:28 +0000	[diff] [blame]	16	#include "llvm/MC/MCExpr.h"
Owen Anderson	07000c6	2006-05-12 06:33:49 +0000	[diff] [blame]	17	#include "llvm/Target/TargetData.h"
Chris Lattner	f014412	2009-07-28 03:13:23 +0000	[diff] [blame]	18	#include "llvm/Target/TargetLoweringObjectFile.h"
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	19	#include "llvm/Target/TargetMachine.h"
Dan Gohman	6f0d024	2008-02-10 18:45:23 +0000	[diff] [blame]	20	#include "llvm/Target/TargetRegisterInfo.h"
Dan Gohman	707e018	2008-04-12 04:36:06 +0000	[diff] [blame]	21	#include "llvm/GlobalVariable.h"
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	22	#include "llvm/DerivedTypes.h"
Dan Gohman	84023e0	2010-07-10 09:00:22 +0000	[diff] [blame]	23	#include "llvm/CodeGen/Analysis.h"
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	24	#include "llvm/CodeGen/MachineFrameInfo.h"
Chris Lattner	071c62f	2010-01-25 23:26:13 +0000	[diff] [blame]	25	#include "llvm/CodeGen/MachineJumpTableInfo.h"
Chris Lattner	589c6f6	2010-01-26 06:28:43 +0000	[diff] [blame]	26	#include "llvm/CodeGen/MachineFunction.h"
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	27	#include "llvm/CodeGen/SelectionDAG.h"
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	28	#include "llvm/ADT/BitVector.h"
Owen Anderson	718cb66	2007-09-07 04:06:50 +0000	[diff] [blame]	29	#include "llvm/ADT/STLExtras.h"
Nadav Rotem	b6fbec3	2011-06-01 12:51:46 +0000	[diff] [blame]	30	#include "llvm/Support/CommandLine.h"
Torok Edwin	c25e758	2009-07-11 20:10:48 +0000	[diff] [blame]	31	#include "llvm/Support/ErrorHandling.h"
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	32	#include "llvm/Support/MathExtras.h"
Nick Lewycky	476b242	2010-12-19 20:43:38 +0000	[diff] [blame]	33	#include <cctype>
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	34	using namespace llvm;
				35
Nadav Rotem	b6fbec3	2011-06-01 12:51:46 +0000	[diff] [blame]	36	/// We are in the process of implementing a new TypeLegalization action
				37	/// - the promotion of vector elements. This feature is disabled by default
				38	/// and only enabled using this flag.
				39	static cl::opt<bool>
Nadav Rotem	8fb06b3	2011-10-16 20:31:33 +0000	[diff] [blame]	40	AllowPromoteIntElem("promote-elements", cl::Hidden, cl::init(true),
Nadav Rotem	b6fbec3	2011-06-01 12:51:46 +0000	[diff] [blame]	41	cl::desc("Allow promotion of integer vector element types"));
				42
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	43	/// InitLibcallNames - Set default libcall names.
				44	///
Evan Cheng	79cca50	2007-01-12 22:51:10 +0000	[diff] [blame]	45	static void InitLibcallNames(const char **Names) {
Anton Korobeynikov	c31642f	2009-05-03 13:14:08 +0000	[diff] [blame]	46	Names[RTLIB::SHL_I16] = "__ashlhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	47	Names[RTLIB::SHL_I32] = "__ashlsi3";
				48	Names[RTLIB::SHL_I64] = "__ashldi3";
Duncan Sands	dddc629	2008-07-11 16:52:29 +0000	[diff] [blame]	49	Names[RTLIB::SHL_I128] = "__ashlti3";
Anton Korobeynikov	c31642f	2009-05-03 13:14:08 +0000	[diff] [blame]	50	Names[RTLIB::SRL_I16] = "__lshrhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	51	Names[RTLIB::SRL_I32] = "__lshrsi3";
				52	Names[RTLIB::SRL_I64] = "__lshrdi3";
Duncan Sands	dddc629	2008-07-11 16:52:29 +0000	[diff] [blame]	53	Names[RTLIB::SRL_I128] = "__lshrti3";
Anton Korobeynikov	c31642f	2009-05-03 13:14:08 +0000	[diff] [blame]	54	Names[RTLIB::SRA_I16] = "__ashrhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	55	Names[RTLIB::SRA_I32] = "__ashrsi3";
				56	Names[RTLIB::SRA_I64] = "__ashrdi3";
Duncan Sands	dddc629	2008-07-11 16:52:29 +0000	[diff] [blame]	57	Names[RTLIB::SRA_I128] = "__ashrti3";
Anton Korobeynikov	8983da7	2009-11-07 17:14:39 +0000	[diff] [blame]	58	Names[RTLIB::MUL_I8] = "__mulqi3";
Anton Korobeynikov	c31642f	2009-05-03 13:14:08 +0000	[diff] [blame]	59	Names[RTLIB::MUL_I16] = "__mulhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	60	Names[RTLIB::MUL_I32] = "__mulsi3";
				61	Names[RTLIB::MUL_I64] = "__muldi3";
Duncan Sands	5ac319a	2008-07-10 15:35:05 +0000	[diff] [blame]	62	Names[RTLIB::MUL_I128] = "__multi3";
Eric Christopher	362fee9	2011-06-17 20:41:29 +0000	[diff] [blame]	63	Names[RTLIB::MULO_I32] = "__mulosi4";
				64	Names[RTLIB::MULO_I64] = "__mulodi4";
				65	Names[RTLIB::MULO_I128] = "__muloti4";
Anton Korobeynikov	8983da7	2009-11-07 17:14:39 +0000	[diff] [blame]	66	Names[RTLIB::SDIV_I8] = "__divqi3";
Anton Korobeynikov	813090c	2009-05-03 13:18:16 +0000	[diff] [blame]	67	Names[RTLIB::SDIV_I16] = "__divhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	68	Names[RTLIB::SDIV_I32] = "__divsi3";
				69	Names[RTLIB::SDIV_I64] = "__divdi3";
Duncan Sands	5ac319a	2008-07-10 15:35:05 +0000	[diff] [blame]	70	Names[RTLIB::SDIV_I128] = "__divti3";
Anton Korobeynikov	8983da7	2009-11-07 17:14:39 +0000	[diff] [blame]	71	Names[RTLIB::UDIV_I8] = "__udivqi3";
Anton Korobeynikov	fb3f84f	2009-05-08 18:50:54 +0000	[diff] [blame]	72	Names[RTLIB::UDIV_I16] = "__udivhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	73	Names[RTLIB::UDIV_I32] = "__udivsi3";
				74	Names[RTLIB::UDIV_I64] = "__udivdi3";
Duncan Sands	5ac319a	2008-07-10 15:35:05 +0000	[diff] [blame]	75	Names[RTLIB::UDIV_I128] = "__udivti3";
Anton Korobeynikov	8983da7	2009-11-07 17:14:39 +0000	[diff] [blame]	76	Names[RTLIB::SREM_I8] = "__modqi3";
Anton Korobeynikov	813090c	2009-05-03 13:18:16 +0000	[diff] [blame]	77	Names[RTLIB::SREM_I16] = "__modhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	78	Names[RTLIB::SREM_I32] = "__modsi3";
				79	Names[RTLIB::SREM_I64] = "__moddi3";
Duncan Sands	5ac319a	2008-07-10 15:35:05 +0000	[diff] [blame]	80	Names[RTLIB::SREM_I128] = "__modti3";
Anton Korobeynikov	8983da7	2009-11-07 17:14:39 +0000	[diff] [blame]	81	Names[RTLIB::UREM_I8] = "__umodqi3";
Anton Korobeynikov	9fe9c8e	2009-05-03 13:19:57 +0000	[diff] [blame]	82	Names[RTLIB::UREM_I16] = "__umodhi3";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	83	Names[RTLIB::UREM_I32] = "__umodsi3";
				84	Names[RTLIB::UREM_I64] = "__umoddi3";
Duncan Sands	5ac319a	2008-07-10 15:35:05 +0000	[diff] [blame]	85	Names[RTLIB::UREM_I128] = "__umodti3";
Evan Cheng	8e23e81	2011-04-01 00:42:02 +0000	[diff] [blame]	86
				87	// These are generally not available.
				88	Names[RTLIB::SDIVREM_I8] = 0;
				89	Names[RTLIB::SDIVREM_I16] = 0;
				90	Names[RTLIB::SDIVREM_I32] = 0;
				91	Names[RTLIB::SDIVREM_I64] = 0;
				92	Names[RTLIB::SDIVREM_I128] = 0;
				93	Names[RTLIB::UDIVREM_I8] = 0;
				94	Names[RTLIB::UDIVREM_I16] = 0;
				95	Names[RTLIB::UDIVREM_I32] = 0;
				96	Names[RTLIB::UDIVREM_I64] = 0;
				97	Names[RTLIB::UDIVREM_I128] = 0;
				98
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	99	Names[RTLIB::NEG_I32] = "__negsi2";
				100	Names[RTLIB::NEG_I64] = "__negdi2";
				101	Names[RTLIB::ADD_F32] = "__addsf3";
				102	Names[RTLIB::ADD_F64] = "__adddf3";
Duncan Sands	007f984	2008-01-10 10:28:30 +0000	[diff] [blame]	103	Names[RTLIB::ADD_F80] = "__addxf3";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	104	Names[RTLIB::ADD_PPCF128] = "__gcc_qadd";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	105	Names[RTLIB::SUB_F32] = "__subsf3";
				106	Names[RTLIB::SUB_F64] = "__subdf3";
Duncan Sands	007f984	2008-01-10 10:28:30 +0000	[diff] [blame]	107	Names[RTLIB::SUB_F80] = "__subxf3";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	108	Names[RTLIB::SUB_PPCF128] = "__gcc_qsub";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	109	Names[RTLIB::MUL_F32] = "__mulsf3";
				110	Names[RTLIB::MUL_F64] = "__muldf3";
Duncan Sands	007f984	2008-01-10 10:28:30 +0000	[diff] [blame]	111	Names[RTLIB::MUL_F80] = "__mulxf3";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	112	Names[RTLIB::MUL_PPCF128] = "__gcc_qmul";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	113	Names[RTLIB::DIV_F32] = "__divsf3";
				114	Names[RTLIB::DIV_F64] = "__divdf3";
Duncan Sands	007f984	2008-01-10 10:28:30 +0000	[diff] [blame]	115	Names[RTLIB::DIV_F80] = "__divxf3";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	116	Names[RTLIB::DIV_PPCF128] = "__gcc_qdiv";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	117	Names[RTLIB::REM_F32] = "fmodf";
				118	Names[RTLIB::REM_F64] = "fmod";
Duncan Sands	007f984	2008-01-10 10:28:30 +0000	[diff] [blame]	119	Names[RTLIB::REM_F80] = "fmodl";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	120	Names[RTLIB::REM_PPCF128] = "fmodl";
Cameron Zwarich	3339084	2011-07-08 21:39:21 +0000	[diff] [blame]	121	Names[RTLIB::FMA_F32] = "fmaf";
				122	Names[RTLIB::FMA_F64] = "fma";
				123	Names[RTLIB::FMA_F80] = "fmal";
				124	Names[RTLIB::FMA_PPCF128] = "fmal";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	125	Names[RTLIB::POWI_F32] = "__powisf2";
				126	Names[RTLIB::POWI_F64] = "__powidf2";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	127	Names[RTLIB::POWI_F80] = "__powixf2";
				128	Names[RTLIB::POWI_PPCF128] = "__powitf2";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	129	Names[RTLIB::SQRT_F32] = "sqrtf";
				130	Names[RTLIB::SQRT_F64] = "sqrt";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	131	Names[RTLIB::SQRT_F80] = "sqrtl";
				132	Names[RTLIB::SQRT_PPCF128] = "sqrtl";
Dale Johannesen	7794f2a	2008-09-04 00:47:13 +0000	[diff] [blame]	133	Names[RTLIB::LOG_F32] = "logf";
				134	Names[RTLIB::LOG_F64] = "log";
				135	Names[RTLIB::LOG_F80] = "logl";
				136	Names[RTLIB::LOG_PPCF128] = "logl";
				137	Names[RTLIB::LOG2_F32] = "log2f";
				138	Names[RTLIB::LOG2_F64] = "log2";
				139	Names[RTLIB::LOG2_F80] = "log2l";
				140	Names[RTLIB::LOG2_PPCF128] = "log2l";
				141	Names[RTLIB::LOG10_F32] = "log10f";
				142	Names[RTLIB::LOG10_F64] = "log10";
				143	Names[RTLIB::LOG10_F80] = "log10l";
				144	Names[RTLIB::LOG10_PPCF128] = "log10l";
				145	Names[RTLIB::EXP_F32] = "expf";
				146	Names[RTLIB::EXP_F64] = "exp";
				147	Names[RTLIB::EXP_F80] = "expl";
				148	Names[RTLIB::EXP_PPCF128] = "expl";
				149	Names[RTLIB::EXP2_F32] = "exp2f";
				150	Names[RTLIB::EXP2_F64] = "exp2";
				151	Names[RTLIB::EXP2_F80] = "exp2l";
				152	Names[RTLIB::EXP2_PPCF128] = "exp2l";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	153	Names[RTLIB::SIN_F32] = "sinf";
				154	Names[RTLIB::SIN_F64] = "sin";
Duncan Sands	007f984	2008-01-10 10:28:30 +0000	[diff] [blame]	155	Names[RTLIB::SIN_F80] = "sinl";
				156	Names[RTLIB::SIN_PPCF128] = "sinl";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	157	Names[RTLIB::COS_F32] = "cosf";
				158	Names[RTLIB::COS_F64] = "cos";
Duncan Sands	007f984	2008-01-10 10:28:30 +0000	[diff] [blame]	159	Names[RTLIB::COS_F80] = "cosl";
				160	Names[RTLIB::COS_PPCF128] = "cosl";
Dan Gohman	e54be10	2007-10-11 23:09:10 +0000	[diff] [blame]	161	Names[RTLIB::POW_F32] = "powf";
				162	Names[RTLIB::POW_F64] = "pow";
				163	Names[RTLIB::POW_F80] = "powl";
				164	Names[RTLIB::POW_PPCF128] = "powl";
Dan Gohman	2bb1e3e	2008-08-21 18:38:14 +0000	[diff] [blame]	165	Names[RTLIB::CEIL_F32] = "ceilf";
				166	Names[RTLIB::CEIL_F64] = "ceil";
				167	Names[RTLIB::CEIL_F80] = "ceill";
				168	Names[RTLIB::CEIL_PPCF128] = "ceill";
				169	Names[RTLIB::TRUNC_F32] = "truncf";
				170	Names[RTLIB::TRUNC_F64] = "trunc";
				171	Names[RTLIB::TRUNC_F80] = "truncl";
				172	Names[RTLIB::TRUNC_PPCF128] = "truncl";
				173	Names[RTLIB::RINT_F32] = "rintf";
				174	Names[RTLIB::RINT_F64] = "rint";
				175	Names[RTLIB::RINT_F80] = "rintl";
				176	Names[RTLIB::RINT_PPCF128] = "rintl";
				177	Names[RTLIB::NEARBYINT_F32] = "nearbyintf";
				178	Names[RTLIB::NEARBYINT_F64] = "nearbyint";
				179	Names[RTLIB::NEARBYINT_F80] = "nearbyintl";
				180	Names[RTLIB::NEARBYINT_PPCF128] = "nearbyintl";
				181	Names[RTLIB::FLOOR_F32] = "floorf";
				182	Names[RTLIB::FLOOR_F64] = "floor";
				183	Names[RTLIB::FLOOR_F80] = "floorl";
				184	Names[RTLIB::FLOOR_PPCF128] = "floorl";
Duncan Sands	d2c817e	2010-03-14 21:08:40 +0000	[diff] [blame]	185	Names[RTLIB::COPYSIGN_F32] = "copysignf";
				186	Names[RTLIB::COPYSIGN_F64] = "copysign";
				187	Names[RTLIB::COPYSIGN_F80] = "copysignl";
				188	Names[RTLIB::COPYSIGN_PPCF128] = "copysignl";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	189	Names[RTLIB::FPEXT_F32_F64] = "__extendsfdf2";
Anton Korobeynikov	927411b	2010-03-14 18:42:24 +0000	[diff] [blame]	190	Names[RTLIB::FPEXT_F16_F32] = "__gnu_h2f_ieee";
				191	Names[RTLIB::FPROUND_F32_F16] = "__gnu_f2h_ieee";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	192	Names[RTLIB::FPROUND_F64_F32] = "__truncdfsf2";
Bruno Cardoso Lopes	e36bfe6	2008-08-07 19:01:24 +0000	[diff] [blame]	193	Names[RTLIB::FPROUND_F80_F32] = "__truncxfsf2";
				194	Names[RTLIB::FPROUND_PPCF128_F32] = "__trunctfsf2";
				195	Names[RTLIB::FPROUND_F80_F64] = "__truncxfdf2";
				196	Names[RTLIB::FPROUND_PPCF128_F64] = "__trunctfdf2";
Anton Korobeynikov	de0118c	2010-03-26 21:32:14 +0000	[diff] [blame]	197	Names[RTLIB::FPTOSINT_F32_I8] = "__fixsfqi";
				198	Names[RTLIB::FPTOSINT_F32_I16] = "__fixsfhi";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	199	Names[RTLIB::FPTOSINT_F32_I32] = "__fixsfsi";
				200	Names[RTLIB::FPTOSINT_F32_I64] = "__fixsfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	201	Names[RTLIB::FPTOSINT_F32_I128] = "__fixsfti";
Anton Korobeynikov	de0118c	2010-03-26 21:32:14 +0000	[diff] [blame]	202	Names[RTLIB::FPTOSINT_F64_I8] = "__fixdfqi";
				203	Names[RTLIB::FPTOSINT_F64_I16] = "__fixdfhi";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	204	Names[RTLIB::FPTOSINT_F64_I32] = "__fixdfsi";
				205	Names[RTLIB::FPTOSINT_F64_I64] = "__fixdfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	206	Names[RTLIB::FPTOSINT_F64_I128] = "__fixdfti";
Duncan Sands	be1ad4d	2008-07-10 15:33:02 +0000	[diff] [blame]	207	Names[RTLIB::FPTOSINT_F80_I32] = "__fixxfsi";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	208	Names[RTLIB::FPTOSINT_F80_I64] = "__fixxfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	209	Names[RTLIB::FPTOSINT_F80_I128] = "__fixxfti";
Duncan Sands	041cde2	2008-06-25 20:24:48 +0000	[diff] [blame]	210	Names[RTLIB::FPTOSINT_PPCF128_I32] = "__fixtfsi";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	211	Names[RTLIB::FPTOSINT_PPCF128_I64] = "__fixtfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	212	Names[RTLIB::FPTOSINT_PPCF128_I128] = "__fixtfti";
Anton Korobeynikov	de0118c	2010-03-26 21:32:14 +0000	[diff] [blame]	213	Names[RTLIB::FPTOUINT_F32_I8] = "__fixunssfqi";
				214	Names[RTLIB::FPTOUINT_F32_I16] = "__fixunssfhi";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	215	Names[RTLIB::FPTOUINT_F32_I32] = "__fixunssfsi";
				216	Names[RTLIB::FPTOUINT_F32_I64] = "__fixunssfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	217	Names[RTLIB::FPTOUINT_F32_I128] = "__fixunssfti";
Anton Korobeynikov	de0118c	2010-03-26 21:32:14 +0000	[diff] [blame]	218	Names[RTLIB::FPTOUINT_F64_I8] = "__fixunsdfqi";
				219	Names[RTLIB::FPTOUINT_F64_I16] = "__fixunsdfhi";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	220	Names[RTLIB::FPTOUINT_F64_I32] = "__fixunsdfsi";
				221	Names[RTLIB::FPTOUINT_F64_I64] = "__fixunsdfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	222	Names[RTLIB::FPTOUINT_F64_I128] = "__fixunsdfti";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	223	Names[RTLIB::FPTOUINT_F80_I32] = "__fixunsxfsi";
				224	Names[RTLIB::FPTOUINT_F80_I64] = "__fixunsxfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	225	Names[RTLIB::FPTOUINT_F80_I128] = "__fixunsxfti";
Duncan Sands	041cde2	2008-06-25 20:24:48 +0000	[diff] [blame]	226	Names[RTLIB::FPTOUINT_PPCF128_I32] = "__fixunstfsi";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	227	Names[RTLIB::FPTOUINT_PPCF128_I64] = "__fixunstfdi";
Dan Gohman	a2e9485	2008-03-10 23:03:31 +0000	[diff] [blame]	228	Names[RTLIB::FPTOUINT_PPCF128_I128] = "__fixunstfti";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	229	Names[RTLIB::SINTTOFP_I32_F32] = "__floatsisf";
				230	Names[RTLIB::SINTTOFP_I32_F64] = "__floatsidf";
Duncan Sands	9bed0f5	2008-07-11 16:57:02 +0000	[diff] [blame]	231	Names[RTLIB::SINTTOFP_I32_F80] = "__floatsixf";
				232	Names[RTLIB::SINTTOFP_I32_PPCF128] = "__floatsitf";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	233	Names[RTLIB::SINTTOFP_I64_F32] = "__floatdisf";
				234	Names[RTLIB::SINTTOFP_I64_F64] = "__floatdidf";
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	235	Names[RTLIB::SINTTOFP_I64_F80] = "__floatdixf";
				236	Names[RTLIB::SINTTOFP_I64_PPCF128] = "__floatditf";
Dan Gohman	d91446d	2008-03-05 01:08:17 +0000	[diff] [blame]	237	Names[RTLIB::SINTTOFP_I128_F32] = "__floattisf";
				238	Names[RTLIB::SINTTOFP_I128_F64] = "__floattidf";
				239	Names[RTLIB::SINTTOFP_I128_F80] = "__floattixf";
				240	Names[RTLIB::SINTTOFP_I128_PPCF128] = "__floattitf";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	241	Names[RTLIB::UINTTOFP_I32_F32] = "__floatunsisf";
				242	Names[RTLIB::UINTTOFP_I32_F64] = "__floatunsidf";
Duncan Sands	ac6cece	2008-07-11 17:00:14 +0000	[diff] [blame]	243	Names[RTLIB::UINTTOFP_I32_F80] = "__floatunsixf";
				244	Names[RTLIB::UINTTOFP_I32_PPCF128] = "__floatunsitf";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	245	Names[RTLIB::UINTTOFP_I64_F32] = "__floatundisf";
				246	Names[RTLIB::UINTTOFP_I64_F64] = "__floatundidf";
Duncan Sands	ac6cece	2008-07-11 17:00:14 +0000	[diff] [blame]	247	Names[RTLIB::UINTTOFP_I64_F80] = "__floatundixf";
				248	Names[RTLIB::UINTTOFP_I64_PPCF128] = "__floatunditf";
				249	Names[RTLIB::UINTTOFP_I128_F32] = "__floatuntisf";
				250	Names[RTLIB::UINTTOFP_I128_F64] = "__floatuntidf";
				251	Names[RTLIB::UINTTOFP_I128_F80] = "__floatuntixf";
				252	Names[RTLIB::UINTTOFP_I128_PPCF128] = "__floatuntitf";
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	253	Names[RTLIB::OEQ_F32] = "__eqsf2";
				254	Names[RTLIB::OEQ_F64] = "__eqdf2";
				255	Names[RTLIB::UNE_F32] = "__nesf2";
				256	Names[RTLIB::UNE_F64] = "__nedf2";
				257	Names[RTLIB::OGE_F32] = "__gesf2";
				258	Names[RTLIB::OGE_F64] = "__gedf2";
				259	Names[RTLIB::OLT_F32] = "__ltsf2";
				260	Names[RTLIB::OLT_F64] = "__ltdf2";
				261	Names[RTLIB::OLE_F32] = "__lesf2";
				262	Names[RTLIB::OLE_F64] = "__ledf2";
				263	Names[RTLIB::OGT_F32] = "__gtsf2";
				264	Names[RTLIB::OGT_F64] = "__gtdf2";
				265	Names[RTLIB::UO_F32] = "__unordsf2";
				266	Names[RTLIB::UO_F64] = "__unorddf2";
Evan Cheng	d385fd6	2007-01-31 09:29:11 +0000	[diff] [blame]	267	Names[RTLIB::O_F32] = "__unordsf2";
				268	Names[RTLIB::O_F64] = "__unorddf2";
Sanjiv Gupta	a114baa	2009-07-30 09:12:56 +0000	[diff] [blame]	269	Names[RTLIB::MEMCPY] = "memcpy";
				270	Names[RTLIB::MEMMOVE] = "memmove";
				271	Names[RTLIB::MEMSET] = "memset";
Duncan Sands	b0f1e17	2009-05-22 20:36:31 +0000	[diff] [blame]	272	Names[RTLIB::UNWIND_RESUME] = "_Unwind_Resume";
Jim Grosbach	e03262f	2010-06-18 21:43:38 +0000	[diff] [blame]	273	Names[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_1] = "__sync_val_compare_and_swap_1";
				274	Names[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_2] = "__sync_val_compare_and_swap_2";
				275	Names[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_4] = "__sync_val_compare_and_swap_4";
				276	Names[RTLIB::SYNC_VAL_COMPARE_AND_SWAP_8] = "__sync_val_compare_and_swap_8";
Jim Grosbach	ef6eb9c	2010-06-18 23:03:10 +0000	[diff] [blame]	277	Names[RTLIB::SYNC_LOCK_TEST_AND_SET_1] = "__sync_lock_test_and_set_1";
				278	Names[RTLIB::SYNC_LOCK_TEST_AND_SET_2] = "__sync_lock_test_and_set_2";
				279	Names[RTLIB::SYNC_LOCK_TEST_AND_SET_4] = "__sync_lock_test_and_set_4";
				280	Names[RTLIB::SYNC_LOCK_TEST_AND_SET_8] = "__sync_lock_test_and_set_8";
Jim Grosbach	e03262f	2010-06-18 21:43:38 +0000	[diff] [blame]	281	Names[RTLIB::SYNC_FETCH_AND_ADD_1] = "__sync_fetch_and_add_1";
				282	Names[RTLIB::SYNC_FETCH_AND_ADD_2] = "__sync_fetch_and_add_2";
				283	Names[RTLIB::SYNC_FETCH_AND_ADD_4] = "__sync_fetch_and_add_4";
				284	Names[RTLIB::SYNC_FETCH_AND_ADD_8] = "__sync_fetch_and_add_8";
				285	Names[RTLIB::SYNC_FETCH_AND_SUB_1] = "__sync_fetch_and_sub_1";
				286	Names[RTLIB::SYNC_FETCH_AND_SUB_2] = "__sync_fetch_and_sub_2";
				287	Names[RTLIB::SYNC_FETCH_AND_SUB_4] = "__sync_fetch_and_sub_4";
				288	Names[RTLIB::SYNC_FETCH_AND_SUB_8] = "__sync_fetch_and_sub_8";
				289	Names[RTLIB::SYNC_FETCH_AND_AND_1] = "__sync_fetch_and_and_1";
				290	Names[RTLIB::SYNC_FETCH_AND_AND_2] = "__sync_fetch_and_and_2";
				291	Names[RTLIB::SYNC_FETCH_AND_AND_4] = "__sync_fetch_and_and_4";
				292	Names[RTLIB::SYNC_FETCH_AND_AND_8] = "__sync_fetch_and_and_8";
				293	Names[RTLIB::SYNC_FETCH_AND_OR_1] = "__sync_fetch_and_or_1";
				294	Names[RTLIB::SYNC_FETCH_AND_OR_2] = "__sync_fetch_and_or_2";
				295	Names[RTLIB::SYNC_FETCH_AND_OR_4] = "__sync_fetch_and_or_4";
				296	Names[RTLIB::SYNC_FETCH_AND_OR_8] = "__sync_fetch_and_or_8";
				297	Names[RTLIB::SYNC_FETCH_AND_XOR_1] = "__sync_fetch_and_xor_1";
				298	Names[RTLIB::SYNC_FETCH_AND_XOR_2] = "__sync_fetch_and_xor_2";
Jim Grosbach	312b7c9	2011-10-14 15:53:48 +0000	[diff] [blame]	299	Names[RTLIB::SYNC_FETCH_AND_XOR_4] = "__sync_fetch_and_xor_4";
Jim Grosbach	e03262f	2010-06-18 21:43:38 +0000	[diff] [blame]	300	Names[RTLIB::SYNC_FETCH_AND_XOR_8] = "__sync_fetch_and_xor_8";
				301	Names[RTLIB::SYNC_FETCH_AND_NAND_1] = "__sync_fetch_and_nand_1";
				302	Names[RTLIB::SYNC_FETCH_AND_NAND_2] = "__sync_fetch_and_nand_2";
				303	Names[RTLIB::SYNC_FETCH_AND_NAND_4] = "__sync_fetch_and_nand_4";
				304	Names[RTLIB::SYNC_FETCH_AND_NAND_8] = "__sync_fetch_and_nand_8";
Evan Cheng	d385fd6	2007-01-31 09:29:11 +0000	[diff] [blame]	305	}
				306
Anton Korobeynikov	72977a4	2009-08-14 20:10:52 +0000	[diff] [blame]	307	/// InitLibcallCallingConvs - Set default libcall CallingConvs.
				308	///
				309	static void InitLibcallCallingConvs(CallingConv::ID *CCs) {
				310	for (int i = 0; i < RTLIB::UNKNOWN_LIBCALL; ++i) {
				311	CCs[i] = CallingConv::C;
				312	}
				313	}
				314
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	315	/// getFPEXT - Return the FPEXT__ value for the given types, or
				316	/// UNKNOWN_LIBCALL if there is none.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	317	RTLIB::Libcall RTLIB::getFPEXT(EVT OpVT, EVT RetVT) {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	318	if (OpVT == MVT::f32) {
				319	if (RetVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	320	return FPEXT_F32_F64;
				321	}
Anton Korobeynikov	927411b	2010-03-14 18:42:24 +0000	[diff] [blame]	322
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	323	return UNKNOWN_LIBCALL;
				324	}
				325
				326	/// getFPROUND - Return the FPROUND__ value for the given types, or
				327	/// UNKNOWN_LIBCALL if there is none.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	328	RTLIB::Libcall RTLIB::getFPROUND(EVT OpVT, EVT RetVT) {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	329	if (RetVT == MVT::f32) {
				330	if (OpVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	331	return FPROUND_F64_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	332	if (OpVT == MVT::f80)
Bruno Cardoso Lopes	e36bfe6	2008-08-07 19:01:24 +0000	[diff] [blame]	333	return FPROUND_F80_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	334	if (OpVT == MVT::ppcf128)
Bruno Cardoso Lopes	e36bfe6	2008-08-07 19:01:24 +0000	[diff] [blame]	335	return FPROUND_PPCF128_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	336	} else if (RetVT == MVT::f64) {
				337	if (OpVT == MVT::f80)
Bruno Cardoso Lopes	e36bfe6	2008-08-07 19:01:24 +0000	[diff] [blame]	338	return FPROUND_F80_F64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	339	if (OpVT == MVT::ppcf128)
Bruno Cardoso Lopes	e36bfe6	2008-08-07 19:01:24 +0000	[diff] [blame]	340	return FPROUND_PPCF128_F64;
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	341	}
Anton Korobeynikov	927411b	2010-03-14 18:42:24 +0000	[diff] [blame]	342
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	343	return UNKNOWN_LIBCALL;
				344	}
				345
				346	/// getFPTOSINT - Return the FPTOSINT__ value for the given types, or
				347	/// UNKNOWN_LIBCALL if there is none.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	348	RTLIB::Libcall RTLIB::getFPTOSINT(EVT OpVT, EVT RetVT) {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	349	if (OpVT == MVT::f32) {
				350	if (RetVT == MVT::i8)
Sanjiv Gupta	8aa207e	2009-06-16 09:03:58 +0000	[diff] [blame]	351	return FPTOSINT_F32_I8;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	352	if (RetVT == MVT::i16)
Sanjiv Gupta	8aa207e	2009-06-16 09:03:58 +0000	[diff] [blame]	353	return FPTOSINT_F32_I16;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	354	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	355	return FPTOSINT_F32_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	356	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	357	return FPTOSINT_F32_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	358	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	359	return FPTOSINT_F32_I128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	360	} else if (OpVT == MVT::f64) {
Anton Korobeynikov	de0118c	2010-03-26 21:32:14 +0000	[diff] [blame]	361	if (RetVT == MVT::i8)
				362	return FPTOSINT_F64_I8;
				363	if (RetVT == MVT::i16)
				364	return FPTOSINT_F64_I16;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	365	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	366	return FPTOSINT_F64_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	367	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	368	return FPTOSINT_F64_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	369	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	370	return FPTOSINT_F64_I128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	371	} else if (OpVT == MVT::f80) {
				372	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	373	return FPTOSINT_F80_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	374	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	375	return FPTOSINT_F80_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	376	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	377	return FPTOSINT_F80_I128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	378	} else if (OpVT == MVT::ppcf128) {
				379	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	380	return FPTOSINT_PPCF128_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	381	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	382	return FPTOSINT_PPCF128_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	383	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	384	return FPTOSINT_PPCF128_I128;
				385	}
				386	return UNKNOWN_LIBCALL;
				387	}
				388
				389	/// getFPTOUINT - Return the FPTOUINT__ value for the given types, or
				390	/// UNKNOWN_LIBCALL if there is none.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	391	RTLIB::Libcall RTLIB::getFPTOUINT(EVT OpVT, EVT RetVT) {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	392	if (OpVT == MVT::f32) {
				393	if (RetVT == MVT::i8)
Sanjiv Gupta	8aa207e	2009-06-16 09:03:58 +0000	[diff] [blame]	394	return FPTOUINT_F32_I8;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	395	if (RetVT == MVT::i16)
Sanjiv Gupta	8aa207e	2009-06-16 09:03:58 +0000	[diff] [blame]	396	return FPTOUINT_F32_I16;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	397	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	398	return FPTOUINT_F32_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	399	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	400	return FPTOUINT_F32_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	401	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	402	return FPTOUINT_F32_I128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	403	} else if (OpVT == MVT::f64) {
Anton Korobeynikov	de0118c	2010-03-26 21:32:14 +0000	[diff] [blame]	404	if (RetVT == MVT::i8)
				405	return FPTOUINT_F64_I8;
				406	if (RetVT == MVT::i16)
				407	return FPTOUINT_F64_I16;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	408	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	409	return FPTOUINT_F64_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	410	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	411	return FPTOUINT_F64_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	412	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	413	return FPTOUINT_F64_I128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	414	} else if (OpVT == MVT::f80) {
				415	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	416	return FPTOUINT_F80_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	417	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	418	return FPTOUINT_F80_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	419	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	420	return FPTOUINT_F80_I128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	421	} else if (OpVT == MVT::ppcf128) {
				422	if (RetVT == MVT::i32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	423	return FPTOUINT_PPCF128_I32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	424	if (RetVT == MVT::i64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	425	return FPTOUINT_PPCF128_I64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	426	if (RetVT == MVT::i128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	427	return FPTOUINT_PPCF128_I128;
				428	}
				429	return UNKNOWN_LIBCALL;
				430	}
				431
				432	/// getSINTTOFP - Return the SINTTOFP__ value for the given types, or
				433	/// UNKNOWN_LIBCALL if there is none.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	434	RTLIB::Libcall RTLIB::getSINTTOFP(EVT OpVT, EVT RetVT) {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	435	if (OpVT == MVT::i32) {
				436	if (RetVT == MVT::f32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	437	return SINTTOFP_I32_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	438	else if (RetVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	439	return SINTTOFP_I32_F64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	440	else if (RetVT == MVT::f80)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	441	return SINTTOFP_I32_F80;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	442	else if (RetVT == MVT::ppcf128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	443	return SINTTOFP_I32_PPCF128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	444	} else if (OpVT == MVT::i64) {
				445	if (RetVT == MVT::f32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	446	return SINTTOFP_I64_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	447	else if (RetVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	448	return SINTTOFP_I64_F64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	449	else if (RetVT == MVT::f80)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	450	return SINTTOFP_I64_F80;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	451	else if (RetVT == MVT::ppcf128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	452	return SINTTOFP_I64_PPCF128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	453	} else if (OpVT == MVT::i128) {
				454	if (RetVT == MVT::f32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	455	return SINTTOFP_I128_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	456	else if (RetVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	457	return SINTTOFP_I128_F64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	458	else if (RetVT == MVT::f80)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	459	return SINTTOFP_I128_F80;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	460	else if (RetVT == MVT::ppcf128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	461	return SINTTOFP_I128_PPCF128;
				462	}
				463	return UNKNOWN_LIBCALL;
				464	}
				465
				466	/// getUINTTOFP - Return the UINTTOFP__ value for the given types, or
				467	/// UNKNOWN_LIBCALL if there is none.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	468	RTLIB::Libcall RTLIB::getUINTTOFP(EVT OpVT, EVT RetVT) {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	469	if (OpVT == MVT::i32) {
				470	if (RetVT == MVT::f32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	471	return UINTTOFP_I32_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	472	else if (RetVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	473	return UINTTOFP_I32_F64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	474	else if (RetVT == MVT::f80)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	475	return UINTTOFP_I32_F80;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	476	else if (RetVT == MVT::ppcf128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	477	return UINTTOFP_I32_PPCF128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	478	} else if (OpVT == MVT::i64) {
				479	if (RetVT == MVT::f32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	480	return UINTTOFP_I64_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	481	else if (RetVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	482	return UINTTOFP_I64_F64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	483	else if (RetVT == MVT::f80)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	484	return UINTTOFP_I64_F80;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	485	else if (RetVT == MVT::ppcf128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	486	return UINTTOFP_I64_PPCF128;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	487	} else if (OpVT == MVT::i128) {
				488	if (RetVT == MVT::f32)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	489	return UINTTOFP_I128_F32;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	490	else if (RetVT == MVT::f64)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	491	return UINTTOFP_I128_F64;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	492	else if (RetVT == MVT::f80)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	493	return UINTTOFP_I128_F80;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	494	else if (RetVT == MVT::ppcf128)
Duncan Sands	b2ff885	2008-07-17 02:36:29 +0000	[diff] [blame]	495	return UINTTOFP_I128_PPCF128;
				496	}
				497	return UNKNOWN_LIBCALL;
				498	}
				499
Evan Cheng	d385fd6	2007-01-31 09:29:11 +0000	[diff] [blame]	500	/// InitCmpLibcallCCs - Set default comparison libcall CC.
				501	///
				502	static void InitCmpLibcallCCs(ISD::CondCode *CCs) {
				503	memset(CCs, ISD::SETCC_INVALID, sizeof(ISD::CondCode)*RTLIB::UNKNOWN_LIBCALL);
				504	CCs[RTLIB::OEQ_F32] = ISD::SETEQ;
				505	CCs[RTLIB::OEQ_F64] = ISD::SETEQ;
				506	CCs[RTLIB::UNE_F32] = ISD::SETNE;
				507	CCs[RTLIB::UNE_F64] = ISD::SETNE;
				508	CCs[RTLIB::OGE_F32] = ISD::SETGE;
				509	CCs[RTLIB::OGE_F64] = ISD::SETGE;
				510	CCs[RTLIB::OLT_F32] = ISD::SETLT;
				511	CCs[RTLIB::OLT_F64] = ISD::SETLT;
				512	CCs[RTLIB::OLE_F32] = ISD::SETLE;
				513	CCs[RTLIB::OLE_F64] = ISD::SETLE;
				514	CCs[RTLIB::OGT_F32] = ISD::SETGT;
				515	CCs[RTLIB::OGT_F64] = ISD::SETGT;
				516	CCs[RTLIB::UO_F32] = ISD::SETNE;
				517	CCs[RTLIB::UO_F64] = ISD::SETNE;
				518	CCs[RTLIB::O_F32] = ISD::SETEQ;
				519	CCs[RTLIB::O_F64] = ISD::SETEQ;
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	520	}
				521
Chris Lattner	f014412	2009-07-28 03:13:23 +0000	[diff] [blame]	522	/// NOTE: The constructor takes ownership of TLOF.
Dan Gohman	f0757b0	2010-04-21 01:34:56 +0000	[diff] [blame]	523	TargetLowering::TargetLowering(const TargetMachine &tm,
				524	const TargetLoweringObjectFile *tlof)
Nadav Rotem	b6fbec3	2011-06-01 12:51:46 +0000	[diff] [blame]	525	: TM(tm), TD(TM.getTargetData()), TLOF(*tlof),
				526	mayPromoteElements(AllowPromoteIntElem) {
Chris Lattner	cba82f9	2005-01-16 07:28:11 +0000	[diff] [blame]	527	// All operations default to being supported.
				528	memset(OpActions, 0, sizeof(OpActions));
Evan Cheng	0329466	2008-10-14 21:26:46 +0000	[diff] [blame]	529	memset(LoadExtActions, 0, sizeof(LoadExtActions));
Chris Lattner	ddf8956	2008-01-17 19:59:44 +0000	[diff] [blame]	530	memset(TruncStoreActions, 0, sizeof(TruncStoreActions));
Chris Lattner	c9133f9	2008-01-18 19:36:20 +0000	[diff] [blame]	531	memset(IndexedModeActions, 0, sizeof(IndexedModeActions));
Evan Cheng	7f04268	2008-10-15 02:05:31 +0000	[diff] [blame]	532	memset(CondCodeActions, 0, sizeof(CondCodeActions));
Dan Gohman	93f81e2	2007-07-09 20:49:44 +0000	[diff] [blame]	533
Chris Lattner	1a3048b	2007-12-22 20:47:56 +0000	[diff] [blame]	534	// Set default actions for various operations.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	535	for (unsigned VT = 0; VT != (unsigned)MVT::LAST_VALUETYPE; ++VT) {
Chris Lattner	1a3048b	2007-12-22 20:47:56 +0000	[diff] [blame]	536	// Default all indexed load / store to expand.
Evan Cheng	5ff839f	2006-11-09 18:56:43 +0000	[diff] [blame]	537	for (unsigned IM = (unsigned)ISD::PRE_INC;
				538	IM != (unsigned)ISD::LAST_INDEXED_MODE; ++IM) {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	539	setIndexedLoadAction(IM, (MVT::SimpleValueType)VT, Expand);
				540	setIndexedStoreAction(IM, (MVT::SimpleValueType)VT, Expand);
Evan Cheng	5ff839f	2006-11-09 18:56:43 +0000	[diff] [blame]	541	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	542
Chris Lattner	1a3048b	2007-12-22 20:47:56 +0000	[diff] [blame]	543	// These operations default to expand.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	544	setOperationAction(ISD::FGETSIGN, (MVT::SimpleValueType)VT, Expand);
				545	setOperationAction(ISD::CONCAT_VECTORS, (MVT::SimpleValueType)VT, Expand);
Evan Cheng	5ff839f	2006-11-09 18:56:43 +0000	[diff] [blame]	546	}
Evan Cheng	d2cde68	2008-03-10 19:38:10 +0000	[diff] [blame]	547
				548	// Most targets ignore the @llvm.prefetch intrinsic.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	549	setOperationAction(ISD::PREFETCH, MVT::Other, Expand);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	550
				551	// ConstantFP nodes default to expand. Targets can either change this to
Evan Cheng	eb2f969	2009-10-27 19:56:55 +0000	[diff] [blame]	552	// Legal, in which case all fp constants are legal, or use isFPImmLegal()
Nate Begeman	e179584	2008-02-14 08:57:00 +0000	[diff] [blame]	553	// to optimize expansions for certain constants.
Dan Gohman	e3376ec	2011-12-20 00:02:33 +0000	[diff] [blame]	554	setOperationAction(ISD::ConstantFP, MVT::f16, Expand);
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	555	setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
				556	setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
				557	setOperationAction(ISD::ConstantFP, MVT::f80, Expand);
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	558
Dale Johannesen	0bb4160	2008-09-22 21:57:32 +0000	[diff] [blame]	559	// These library functions default to expand.
Dan Gohman	e3376ec	2011-12-20 00:02:33 +0000	[diff] [blame]	560	setOperationAction(ISD::FLOG , MVT::f16, Expand);
				561	setOperationAction(ISD::FLOG2, MVT::f16, Expand);
				562	setOperationAction(ISD::FLOG10, MVT::f16, Expand);
				563	setOperationAction(ISD::FEXP , MVT::f16, Expand);
				564	setOperationAction(ISD::FEXP2, MVT::f16, Expand);
				565	setOperationAction(ISD::FFLOOR, MVT::f16, Expand);
				566	setOperationAction(ISD::FNEARBYINT, MVT::f16, Expand);
				567	setOperationAction(ISD::FCEIL, MVT::f16, Expand);
				568	setOperationAction(ISD::FRINT, MVT::f16, Expand);
				569	setOperationAction(ISD::FTRUNC, MVT::f16, Expand);
Owen Anderson	4a4fdf3	2011-12-08 19:32:14 +0000	[diff] [blame]	570	setOperationAction(ISD::FLOG , MVT::f32, Expand);
				571	setOperationAction(ISD::FLOG2, MVT::f32, Expand);
				572	setOperationAction(ISD::FLOG10, MVT::f32, Expand);
				573	setOperationAction(ISD::FEXP , MVT::f32, Expand);
				574	setOperationAction(ISD::FEXP2, MVT::f32, Expand);
				575	setOperationAction(ISD::FFLOOR, MVT::f32, Expand);
				576	setOperationAction(ISD::FNEARBYINT, MVT::f32, Expand);
				577	setOperationAction(ISD::FCEIL, MVT::f32, Expand);
				578	setOperationAction(ISD::FRINT, MVT::f32, Expand);
				579	setOperationAction(ISD::FTRUNC, MVT::f32, Expand);
Dan Gohman	e3376ec	2011-12-20 00:02:33 +0000	[diff] [blame]	580	setOperationAction(ISD::FLOG , MVT::f64, Expand);
				581	setOperationAction(ISD::FLOG2, MVT::f64, Expand);
				582	setOperationAction(ISD::FLOG10, MVT::f64, Expand);
				583	setOperationAction(ISD::FEXP , MVT::f64, Expand);
				584	setOperationAction(ISD::FEXP2, MVT::f64, Expand);
				585	setOperationAction(ISD::FFLOOR, MVT::f64, Expand);
				586	setOperationAction(ISD::FNEARBYINT, MVT::f64, Expand);
				587	setOperationAction(ISD::FCEIL, MVT::f64, Expand);
				588	setOperationAction(ISD::FRINT, MVT::f64, Expand);
				589	setOperationAction(ISD::FTRUNC, MVT::f64, Expand);
Dale Johannesen	0bb4160	2008-09-22 21:57:32 +0000	[diff] [blame]	590
Chris Lattner	41bab0b	2008-01-15 21:58:08 +0000	[diff] [blame]	591	// Default ISD::TRAP to expand (which turns it into abort).
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	592	setOperationAction(ISD::TRAP, MVT::Other, Expand);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	593
Owen Anderson	a69571c	2006-05-03 01:29:57 +0000	[diff] [blame]	594	IsLittleEndian = TD->isLittleEndian();
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	595	PointerTy = MVT::getIntegerVT(8*TD->getPointerSize());
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	596	memset(RegClassForVT, 0,MVT::LAST_VALUETYPEsizeof(TargetRegisterClass));
Owen Anderson	718cb66	2007-09-07 04:06:50 +0000	[diff] [blame]	597	memset(TargetDAGCombineArray, 0, array_lengthof(TargetDAGCombineArray));
Evan Cheng	a03a5dc	2006-02-14 08:38:30 +0000	[diff] [blame]	598	maxStoresPerMemset = maxStoresPerMemcpy = maxStoresPerMemmove = 8;
Evan Cheng	0521928	2011-01-06 06:52:41 +0000	[diff] [blame]	599	maxStoresPerMemsetOptSize = maxStoresPerMemcpyOptSize
				600	= maxStoresPerMemmoveOptSize = 4;
Evan Cheng	6ebf7bc	2009-05-13 21:42:09 +0000	[diff] [blame]	601	benefitFromCodePlacementOpt = false;
Anton Korobeynikov	d27a258	2006-12-10 23:12:42 +0000	[diff] [blame]	602	UseUnderscoreSetJmp = false;
				603	UseUnderscoreLongJmp = false;
Chris Lattner	6618039	2007-02-25 01:28:05 +0000	[diff] [blame]	604	SelectIsExpensive = false;
Nate Begeman	405e3ec	2005-10-21 00:02:42 +0000	[diff] [blame]	605	IntDivIsCheap = false;
				606	Pow2DivIsCheap = false;
Chris Lattner	de189be	2010-11-30 18:12:52 +0000	[diff] [blame]	607	JumpIsExpensive = false;
Chris Lattner	ee4a765	2006-01-25 18:57:15 +0000	[diff] [blame]	608	StackPointerRegisterToSaveRestore = 0;
Jim Laskey	9bb3c93	2007-02-22 18:04:49 +0000	[diff] [blame]	609	ExceptionPointerRegister = 0;
				610	ExceptionSelectorRegister = 0;
Duncan Sands	0322808	2008-11-23 15:47:28 +0000	[diff] [blame]	611	BooleanContents = UndefinedBooleanContent;
Duncan Sands	28b77e9	2011-09-06 19:07:46 +0000	[diff] [blame]	612	BooleanVectorContents = UndefinedBooleanContent;
Dan Gohman	8c2d270	2011-10-24 17:45:02 +0000	[diff] [blame]	613	SchedPreferenceInfo = Sched::ILP;
Chris Lattner	7acf5f3	2006-09-05 17:39:15 +0000	[diff] [blame]	614	JumpBufSize = 0;
Duraid Madina	0c9e0ff	2006-09-04 07:44:11 +0000	[diff] [blame]	615	JumpBufAlignment = 0;
Eli Friedman	fc5d305	2011-05-06 20:34:06 +0000	[diff] [blame]	616	MinFunctionAlignment = 0;
				617	PrefFunctionAlignment = 0;
Evan Cheng	fb8075d	2008-02-28 00:43:03 +0000	[diff] [blame]	618	PrefLoopAlignment = 0;
Rafael Espindola	cbeeae2	2010-07-11 04:01:49 +0000	[diff] [blame]	619	MinStackArgumentAlignment = 1;
Jim Grosbach	9a52649	2010-06-23 16:07:42 +0000	[diff] [blame]	620	ShouldFoldAtomicFences = false;
Eli Friedman	26689ac	2011-08-03 21:06:02 +0000	[diff] [blame]	621	InsertFencesForAtomic = false;
Evan Cheng	5696622	2007-01-12 02:11:51 +0000	[diff] [blame]	622
				623	InitLibcallNames(LibcallRoutineNames);
Evan Cheng	d385fd6	2007-01-31 09:29:11 +0000	[diff] [blame]	624	InitCmpLibcallCCs(CmpLibcallCCs);
Anton Korobeynikov	72977a4	2009-08-14 20:10:52 +0000	[diff] [blame]	625	InitLibcallCallingConvs(LibcallCallingConvs);
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	626	}
				627
Chris Lattner	f014412	2009-07-28 03:13:23 +0000	[diff] [blame]	628	TargetLowering::~TargetLowering() {
				629	delete &TLOF;
				630	}
Chris Lattner	cba82f9	2005-01-16 07:28:11 +0000	[diff] [blame]	631
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	632	MVT TargetLowering::getShiftAmountTy(EVT LHSTy) const {
				633	return MVT::getIntegerVT(8*TD->getPointerSize());
				634	}
				635
Mon P Wang	f7ea6c3	2010-02-10 23:37:45 +0000	[diff] [blame]	636	/// canOpTrap - Returns true if the operation can trap for the value type.
				637	/// VT must be a legal type.
				638	bool TargetLowering::canOpTrap(unsigned Op, EVT VT) const {
				639	assert(isTypeLegal(VT));
				640	switch (Op) {
				641	default:
				642	return false;
				643	case ISD::FDIV:
				644	case ISD::FREM:
				645	case ISD::SDIV:
				646	case ISD::UDIV:
				647	case ISD::SREM:
				648	case ISD::UREM:
				649	return true;
				650	}
				651	}
				652
				653
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	654	static unsigned getVectorTypeBreakdownMVT(MVT VT, MVT &IntermediateVT,
Chris Lattner	598751e	2010-07-05 05:36:21 +0000	[diff] [blame]	655	unsigned &NumIntermediates,
				656	EVT &RegisterVT,
				657	TargetLowering *TLI) {
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	658	// Figure out the right, legal destination reg to copy into.
				659	unsigned NumElts = VT.getVectorNumElements();
				660	MVT EltTy = VT.getVectorElementType();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	661
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	662	unsigned NumVectorRegs = 1;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	663
				664	// FIXME: We don't support non-power-of-2-sized vectors for now. Ideally we
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	665	// could break down into LHS/RHS like LegalizeDAG does.
				666	if (!isPowerOf2_32(NumElts)) {
				667	NumVectorRegs = NumElts;
				668	NumElts = 1;
				669	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	670
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	671	// Divide the input until we get to a supported size. This will always
				672	// end with a scalar if the target doesn't support vectors.
				673	while (NumElts > 1 && !TLI->isTypeLegal(MVT::getVectorVT(EltTy, NumElts))) {
				674	NumElts >>= 1;
				675	NumVectorRegs <<= 1;
				676	}
				677
				678	NumIntermediates = NumVectorRegs;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	679
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	680	MVT NewVT = MVT::getVectorVT(EltTy, NumElts);
				681	if (!TLI->isTypeLegal(NewVT))
				682	NewVT = EltTy;
				683	IntermediateVT = NewVT;
				684
Nadav Rotem	0c3e678	2011-06-12 14:56:55 +0000	[diff] [blame]	685	unsigned NewVTSize = NewVT.getSizeInBits();
				686
				687	// Convert sizes such as i33 to i64.
				688	if (!isPowerOf2_32(NewVTSize))
				689	NewVTSize = NextPowerOf2(NewVTSize);
				690
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	691	EVT DestVT = TLI->getRegisterType(NewVT);
				692	RegisterVT = DestVT;
Chris Lattner	32b4b5a	2010-07-05 05:53:14 +0000	[diff] [blame]	693	if (EVT(DestVT).bitsLT(NewVT)) // Value is expanded, e.g. i64 -> i16.
Nadav Rotem	0c3e678	2011-06-12 14:56:55 +0000	[diff] [blame]	694	return NumVectorRegs*(NewVTSize/DestVT.getSizeInBits());
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	695
Chris Lattner	32b4b5a	2010-07-05 05:53:14 +0000	[diff] [blame]	696	// Otherwise, promotion or legal types use the same number of registers as
				697	// the vector decimated to the appropriate level.
				698	return NumVectorRegs;
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	699	}
				700
Evan Cheng	46dcb57	2010-07-19 18:47:01 +0000	[diff] [blame]	701	/// isLegalRC - Return true if the value types that can be represented by the
				702	/// specified register class are all legal.
				703	bool TargetLowering::isLegalRC(const TargetRegisterClass *RC) const {
				704	for (TargetRegisterClass::vt_iterator I = RC->vt_begin(), E = RC->vt_end();
				705	I != E; ++I) {
				706	if (isTypeLegal(*I))
				707	return true;
				708	}
				709	return false;
				710	}
				711
Evan Cheng	46dcb57	2010-07-19 18:47:01 +0000	[diff] [blame]	712	/// findRepresentativeClass - Return the largest legal super-reg register class
Evan Cheng	4f6b467	2010-07-21 06:09:07 +0000	[diff] [blame]	713	/// of the register class for the specified type and its associated "cost".
				714	std::pair<const TargetRegisterClass*, uint8_t>
				715	TargetLowering::findRepresentativeClass(EVT VT) const {
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	716	const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
Evan Cheng	4f6b467	2010-07-21 06:09:07 +0000	[diff] [blame]	717	const TargetRegisterClass *RC = RegClassForVT[VT.getSimpleVT().SimpleTy];
				718	if (!RC)
				719	return std::make_pair(RC, 0);
Evan Cheng	46dcb57	2010-07-19 18:47:01 +0000	[diff] [blame]	720
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	721	// Compute the set of all super-register classes.
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	722	BitVector SuperRegRC(TRI->getNumRegClasses());
Jakob Stoklund Olesen	7fc4d9c	2012-05-04 22:53:28 +0000	[diff] [blame^]	723	for (SuperRegClassIterator RCI(RC, TRI); RCI.isValid(); ++RCI)
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	724	SuperRegRC.setBitsInMask(RCI.getMask());
				725
Jakob Stoklund Olesen	7fc4d9c	2012-05-04 22:53:28 +0000	[diff] [blame^]	726	// Find the first legal register class with the largest spill size.
				727	const TargetRegisterClass *BestRC = RC;
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	728	for (int i = SuperRegRC.find_first(); i >= 0; i = SuperRegRC.find_next(i)) {
				729	const TargetRegisterClass *SuperRC = TRI->getRegClass(i);
Jakob Stoklund Olesen	7fc4d9c	2012-05-04 22:53:28 +0000	[diff] [blame^]	730	// We want the largest possible spill size.
				731	if (SuperRC->getSize() <= BestRC->getSize())
				732	continue;
				733	if (!isLegalRC(SuperRC))
				734	continue;
				735	BestRC = SuperRC;
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	736	}
Jakob Stoklund Olesen	7fc4d9c	2012-05-04 22:53:28 +0000	[diff] [blame^]	737	return std::make_pair(BestRC, 1);
Jakob Stoklund Olesen	e3ee49f	2012-05-04 02:19:22 +0000	[diff] [blame]	738	}
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	739
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	740	/// computeRegisterProperties - Once all of the register classes are added,
				741	/// this allows us to compute derived properties we expose.
				742	void TargetLowering::computeRegisterProperties() {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	743	assert(MVT::LAST_VALUETYPE <= MVT::MAX_ALLOWED_VALUETYPE &&
Chris Lattner	bb97d81	2005-01-16 01:10:58 +0000	[diff] [blame]	744	"Too many value types for ValueTypeActions to hold!");
				745
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	746	// Everything defaults to needing one register.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	747	for (unsigned i = 0; i != MVT::LAST_VALUETYPE; ++i) {
Dan Gohman	b9f1019	2007-06-21 14:42:22 +0000	[diff] [blame]	748	NumRegistersForVT[i] = 1;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	749	RegisterTypeForVT[i] = TransformToType[i] = (MVT::SimpleValueType)i;
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	750	}
				751	// ...except isVoid, which doesn't need any registers.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	752	NumRegistersForVT[MVT::isVoid] = 0;
Misha Brukman	f976c85	2005-04-21 22:55:34 +0000	[diff] [blame]	753
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	754	// Find the largest integer register class.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	755	unsigned LargestIntReg = MVT::LAST_INTEGER_VALUETYPE;
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	756	for (; RegClassForVT[LargestIntReg] == 0; --LargestIntReg)
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	757	assert(LargestIntReg != MVT::i1 && "No integer registers defined!");
Chris Lattner	310968c	2005-01-07 07:44:53 +0000	[diff] [blame]	758
				759	// Every integer value type larger than this largest register takes twice as
				760	// many registers to represent as the previous ValueType.
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	761	for (unsigned ExpandedReg = LargestIntReg + 1; ; ++ExpandedReg) {
Dan Gohman	8a55ce4	2009-09-23 21:02:20 +0000	[diff] [blame]	762	EVT ExpandedVT = (MVT::SimpleValueType)ExpandedReg;
				763	if (!ExpandedVT.isInteger())
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	764	break;
Dan Gohman	b9f1019	2007-06-21 14:42:22 +0000	[diff] [blame]	765	NumRegistersForVT[ExpandedReg] = 2*NumRegistersForVT[ExpandedReg-1];
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	766	RegisterTypeForVT[ExpandedReg] = (MVT::SimpleValueType)LargestIntReg;
				767	TransformToType[ExpandedReg] = (MVT::SimpleValueType)(ExpandedReg - 1);
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	768	ValueTypeActions.setTypeAction(ExpandedVT, TypeExpandInteger);
Evan Cheng	1a8f1fe	2006-12-09 02:42:38 +0000	[diff] [blame]	769	}
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	770
				771	// Inspect all of the ValueType's smaller than the largest integer
				772	// register to see which ones need promotion.
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	773	unsigned LegalIntReg = LargestIntReg;
				774	for (unsigned IntReg = LargestIntReg - 1;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	775	IntReg >= (unsigned)MVT::i1; --IntReg) {
				776	EVT IVT = (MVT::SimpleValueType)IntReg;
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	777	if (isTypeLegal(IVT)) {
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	778	LegalIntReg = IntReg;
				779	} else {
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	780	RegisterTypeForVT[IntReg] = TransformToType[IntReg] =
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	781	(MVT::SimpleValueType)LegalIntReg;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	782	ValueTypeActions.setTypeAction(IVT, TypePromoteInteger);
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	783	}
				784	}
				785
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	786	// ppcf128 type is really two f64's.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	787	if (!isTypeLegal(MVT::ppcf128)) {
				788	NumRegistersForVT[MVT::ppcf128] = 2*NumRegistersForVT[MVT::f64];
				789	RegisterTypeForVT[MVT::ppcf128] = MVT::f64;
				790	TransformToType[MVT::ppcf128] = MVT::f64;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	791	ValueTypeActions.setTypeAction(MVT::ppcf128, TypeExpandFloat);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	792	}
Dale Johannesen	161e897	2007-10-05 20:04:43 +0000	[diff] [blame]	793
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	794	// Decide how to handle f64. If the target does not have native f64 support,
				795	// expand it to i64 and we will be generating soft float library calls.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	796	if (!isTypeLegal(MVT::f64)) {
				797	NumRegistersForVT[MVT::f64] = NumRegistersForVT[MVT::i64];
				798	RegisterTypeForVT[MVT::f64] = RegisterTypeForVT[MVT::i64];
				799	TransformToType[MVT::f64] = MVT::i64;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	800	ValueTypeActions.setTypeAction(MVT::f64, TypeSoftenFloat);
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	801	}
				802
				803	// Decide how to handle f32. If the target does not have native support for
				804	// f32, promote it to f64 if it is legal. Otherwise, expand it to i32.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	805	if (!isTypeLegal(MVT::f32)) {
				806	if (isTypeLegal(MVT::f64)) {
				807	NumRegistersForVT[MVT::f32] = NumRegistersForVT[MVT::f64];
				808	RegisterTypeForVT[MVT::f32] = RegisterTypeForVT[MVT::f64];
				809	TransformToType[MVT::f32] = MVT::f64;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	810	ValueTypeActions.setTypeAction(MVT::f32, TypePromoteInteger);
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	811	} else {
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	812	NumRegistersForVT[MVT::f32] = NumRegistersForVT[MVT::i32];
				813	RegisterTypeForVT[MVT::f32] = RegisterTypeForVT[MVT::i32];
				814	TransformToType[MVT::f32] = MVT::i32;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	815	ValueTypeActions.setTypeAction(MVT::f32, TypeSoftenFloat);
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	816	}
Evan Cheng	1a8f1fe	2006-12-09 02:42:38 +0000	[diff] [blame]	817	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	818
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	819	// Loop over all of the vector value types to see which need transformations.
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	820	for (unsigned i = MVT::FIRST_VECTOR_VALUETYPE;
				821	i <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++i) {
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	822	MVT VT = (MVT::SimpleValueType)i;
Chris Lattner	598751e	2010-07-05 05:36:21 +0000	[diff] [blame]	823	if (isTypeLegal(VT)) continue;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	824
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	825	// Determine if there is a legal wider type. If so, we should promote to
				826	// that wider vector type.
				827	EVT EltVT = VT.getVectorElementType();
				828	unsigned NElts = VT.getVectorNumElements();
				829	if (NElts != 1) {
				830	bool IsLegalWiderType = false;
Nadav Rotem	f1c025d	2011-06-04 20:32:01 +0000	[diff] [blame]	831	// If we allow the promotion of vector elements using a flag,
				832	// then return TypePromoteInteger on vector elements.
				833	// First try to promote the elements of integer vectors. If no legal
				834	// promotion was found, fallback to the widen-vector method.
				835	if (mayPromoteElements)
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	836	for (unsigned nVT = i+1; nVT <= MVT::LAST_VECTOR_VALUETYPE; ++nVT) {
				837	EVT SVT = (MVT::SimpleValueType)nVT;
Nadav Rotem	f1c025d	2011-06-04 20:32:01 +0000	[diff] [blame]	838	// Promote vectors of integers to vectors with the same number
				839	// of elements, with a wider element type.
				840	if (SVT.getVectorElementType().getSizeInBits() > EltVT.getSizeInBits()
				841	&& SVT.getVectorNumElements() == NElts &&
				842	isTypeLegal(SVT) && SVT.getScalarType().isInteger()) {
				843	TransformToType[i] = SVT;
				844	RegisterTypeForVT[i] = SVT;
				845	NumRegistersForVT[i] = 1;
				846	ValueTypeActions.setTypeAction(VT, TypePromoteInteger);
				847	IsLegalWiderType = true;
				848	break;
Nadav Rotem	b6fbec3	2011-06-01 12:51:46 +0000	[diff] [blame]	849	}
Nadav Rotem	f1c025d	2011-06-04 20:32:01 +0000	[diff] [blame]	850	}
Nadav Rotem	b6fbec3	2011-06-01 12:51:46 +0000	[diff] [blame]	851
Nadav Rotem	f1c025d	2011-06-04 20:32:01 +0000	[diff] [blame]	852	if (IsLegalWiderType) continue;
				853
				854	// Try to widen the vector.
				855	for (unsigned nVT = i+1; nVT <= MVT::LAST_VECTOR_VALUETYPE; ++nVT) {
				856	EVT SVT = (MVT::SimpleValueType)nVT;
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	857	if (SVT.getVectorElementType() == EltVT &&
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	858	SVT.getVectorNumElements() > NElts &&
Dale Johannesen	e93d99c	2010-10-20 21:32:10 +0000	[diff] [blame]	859	isTypeLegal(SVT)) {
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	860	TransformToType[i] = SVT;
				861	RegisterTypeForVT[i] = SVT;
				862	NumRegistersForVT[i] = 1;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	863	ValueTypeActions.setTypeAction(VT, TypeWidenVector);
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	864	IsLegalWiderType = true;
				865	break;
				866	}
				867	}
				868	if (IsLegalWiderType) continue;
				869	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	870
Chris Lattner	598751e	2010-07-05 05:36:21 +0000	[diff] [blame]	871	MVT IntermediateVT;
				872	EVT RegisterVT;
				873	unsigned NumIntermediates;
				874	NumRegistersForVT[i] =
				875	getVectorTypeBreakdownMVT(VT, IntermediateVT, NumIntermediates,
				876	RegisterVT, this);
				877	RegisterTypeForVT[i] = RegisterVT;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	878
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	879	EVT NVT = VT.getPow2VectorType();
				880	if (NVT == VT) {
				881	// Type is already a power of 2. The default action is to split.
				882	TransformToType[i] = MVT::Other;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	883	unsigned NumElts = VT.getVectorNumElements();
				884	ValueTypeActions.setTypeAction(VT,
				885	NumElts > 1 ? TypeSplitVector : TypeScalarizeVector);
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	886	} else {
				887	TransformToType[i] = NVT;
Nadav Rotem	b6aacae	2011-05-28 17:57:14 +0000	[diff] [blame]	888	ValueTypeActions.setTypeAction(VT, TypeWidenVector);
Dan Gohman	7f32156	2007-06-25 16:23:39 +0000	[diff] [blame]	889	}
Chris Lattner	3a593584	2006-03-16 19:50:01 +0000	[diff] [blame]	890	}
Evan Cheng	46dcb57	2010-07-19 18:47:01 +0000	[diff] [blame]	891
				892	// Determine the 'representative' register class for each value type.
				893	// An representative register class is the largest (meaning one which is
				894	// not a sub-register class / subreg register class) legal register class for
				895	// a group of value types. For example, on i386, i8, i16, and i32
				896	// representative would be GR32; while on x86_64 it's GR64.
Evan Cheng	d70f57b	2010-07-19 22:15:08 +0000	[diff] [blame]	897	for (unsigned i = 0; i != MVT::LAST_VALUETYPE; ++i) {
Evan Cheng	4f6b467	2010-07-21 06:09:07 +0000	[diff] [blame]	898	const TargetRegisterClass* RRC;
				899	uint8_t Cost;
				900	tie(RRC, Cost) = findRepresentativeClass((MVT::SimpleValueType)i);
				901	RepRegClassForVT[i] = RRC;
				902	RepRegClassCostForVT[i] = Cost;
Evan Cheng	d70f57b	2010-07-19 22:15:08 +0000	[diff] [blame]	903	}
Chris Lattner	bb97d81	2005-01-16 01:10:58 +0000	[diff] [blame]	904	}
Chris Lattner	cba82f9	2005-01-16 07:28:11 +0000	[diff] [blame]	905
Evan Cheng	7226158	2005-12-20 06:22:03 +0000	[diff] [blame]	906	const char *TargetLowering::getTargetNodeName(unsigned Opcode) const {
				907	return NULL;
				908	}
Evan Cheng	3a03ebb	2005-12-21 23:05:39 +0000	[diff] [blame]	909
Scott Michel	5b8f82e	2008-03-10 15:42:14 +0000	[diff] [blame]	910
Duncan Sands	28b77e9	2011-09-06 19:07:46 +0000	[diff] [blame]	911	EVT TargetLowering::getSetCCResultType(EVT VT) const {
				912	assert(!VT.isVector() && "No default SetCC type for vectors!");
Owen Anderson	1d0be15	2009-08-13 21:58:54 +0000	[diff] [blame]	913	return PointerTy.SimpleTy;
Scott Michel	5b8f82e	2008-03-10 15:42:14 +0000	[diff] [blame]	914	}
				915
Sanjiv Gupta	8f17a36	2009-12-28 02:40:33 +0000	[diff] [blame]	916	MVT::SimpleValueType TargetLowering::getCmpLibcallReturnType() const {
				917	return MVT::i32; // return the default value
				918	}
				919
Dan Gohman	7f32156	2007-06-25 16:23:39 +0000	[diff] [blame]	920	/// getVectorTypeBreakdown - Vector types are broken down into some number of
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	921	/// legal first class types. For example, MVT::v8f32 maps to 2 MVT::v4f32
				922	/// with Altivec or SSE1, or 8 promoted MVT::f64 values with the X86 FP stack.
				923	/// Similarly, MVT::v2i64 turns into 4 MVT::i32 values with both PPC and X86.
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	924	///
Dan Gohman	7f32156	2007-06-25 16:23:39 +0000	[diff] [blame]	925	/// This method returns the number of registers needed, and the VT for each
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	926	/// register. It also returns the VT and quantity of the intermediate values
				927	/// before they are promoted/expanded.
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	928	///
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	929	unsigned TargetLowering::getVectorTypeBreakdown(LLVMContext &Context, EVT VT,
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	930	EVT &IntermediateVT,
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	931	unsigned &NumIntermediates,
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	932	EVT &RegisterVT) const {
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	933	unsigned NumElts = VT.getVectorNumElements();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	934
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	935	// If there is a wider vector type with the same element type as this one,
Nadav Rotem	db34616	2012-04-21 20:08:32 +0000	[diff] [blame]	936	// or a promoted vector type that has the same number of elements which
				937	// are wider, then we should convert to that legal vector type.
				938	// This handles things like <2 x float> -> <4 x float> and
				939	// <4 x i1> -> <4 x i32>.
				940	LegalizeTypeAction TA = getTypeAction(Context, VT);
				941	if (NumElts != 1 && (TA == TypeWidenVector \|\| TA == TypePromoteInteger)) {
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	942	RegisterVT = getTypeToTransformTo(Context, VT);
				943	if (isTypeLegal(RegisterVT)) {
				944	IntermediateVT = RegisterVT;
				945	NumIntermediates = 1;
				946	return 1;
				947	}
				948	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	949
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	950	// Figure out the right, legal destination reg to copy into.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	951	EVT EltTy = VT.getVectorElementType();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	952
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	953	unsigned NumVectorRegs = 1;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	954
				955	// FIXME: We don't support non-power-of-2-sized vectors for now. Ideally we
Nate Begeman	d73ab88	2007-11-27 19:28:48 +0000	[diff] [blame]	956	// could break down into LHS/RHS like LegalizeDAG does.
				957	if (!isPowerOf2_32(NumElts)) {
				958	NumVectorRegs = NumElts;
				959	NumElts = 1;
				960	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	961
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	962	// Divide the input until we get to a supported size. This will always
				963	// end with a scalar if the target doesn't support vectors.
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	964	while (NumElts > 1 && !isTypeLegal(
				965	EVT::getVectorVT(Context, EltTy, NumElts))) {
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	966	NumElts >>= 1;
				967	NumVectorRegs <<= 1;
				968	}
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	969
				970	NumIntermediates = NumVectorRegs;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	971
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	972	EVT NewVT = EVT::getVectorVT(Context, EltTy, NumElts);
Dan Gohman	7f32156	2007-06-25 16:23:39 +0000	[diff] [blame]	973	if (!isTypeLegal(NewVT))
				974	NewVT = EltTy;
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	975	IntermediateVT = NewVT;
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	976
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	977	EVT DestVT = getRegisterType(Context, NewVT);
Dan Gohman	b6f5b00	2007-06-28 23:29:44 +0000	[diff] [blame]	978	RegisterVT = DestVT;
Nadav Rotem	0c3e678	2011-06-12 14:56:55 +0000	[diff] [blame]	979	unsigned NewVTSize = NewVT.getSizeInBits();
				980
				981	// Convert sizes such as i33 to i64.
				982	if (!isPowerOf2_32(NewVTSize))
				983	NewVTSize = NextPowerOf2(NewVTSize);
				984
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	985	if (DestVT.bitsLT(NewVT)) // Value is expanded, e.g. i64 -> i16.
Nadav Rotem	0c3e678	2011-06-12 14:56:55 +0000	[diff] [blame]	986	return NumVectorRegs*(NewVTSize/DestVT.getSizeInBits());
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	987
Chris Lattner	e6f7c26	2010-08-25 22:49:25 +0000	[diff] [blame]	988	// Otherwise, promotion or legal types use the same number of registers as
				989	// the vector decimated to the appropriate level.
				990	return NumVectorRegs;
Chris Lattner	dc87929	2006-03-31 00:28:56 +0000	[diff] [blame]	991	}
				992
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	993	/// Get the EVTs and ArgFlags collections that represent the legalized return
Dan Gohman	84023e0	2010-07-10 09:00:22 +0000	[diff] [blame]	994	/// type of the given function. This does not require a DAG or a return value,
				995	/// and is suitable for use before any DAGs for the function are constructed.
				996	/// TODO: Move this out of TargetLowering.cpp.
Chris Lattner	db125cf	2011-07-18 04:54:35 +0000	[diff] [blame]	997	void llvm::GetReturnInfo(Type* ReturnType, Attributes attr,
Dan Gohman	84023e0	2010-07-10 09:00:22 +0000	[diff] [blame]	998	SmallVectorImpl<ISD::OutputArg> &Outs,
				999	const TargetLowering &TLI,
				1000	SmallVectorImpl<uint64_t> *Offsets) {
				1001	SmallVector<EVT, 4> ValueVTs;
				1002	ComputeValueVTs(TLI, ReturnType, ValueVTs);
				1003	unsigned NumValues = ValueVTs.size();
				1004	if (NumValues == 0) return;
				1005	unsigned Offset = 0;
				1006
				1007	for (unsigned j = 0, f = NumValues; j != f; ++j) {
				1008	EVT VT = ValueVTs[j];
				1009	ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
				1010
				1011	if (attr & Attribute::SExt)
				1012	ExtendKind = ISD::SIGN_EXTEND;
				1013	else if (attr & Attribute::ZExt)
				1014	ExtendKind = ISD::ZERO_EXTEND;
				1015
				1016	// FIXME: C calling convention requires the return type to be promoted to
				1017	// at least 32-bit. But this is not necessary for non-C calling
				1018	// conventions. The frontend should mark functions whose return values
				1019	// require promoting with signext or zeroext attributes.
				1020	if (ExtendKind != ISD::ANY_EXTEND && VT.isInteger()) {
				1021	EVT MinVT = TLI.getRegisterType(ReturnType->getContext(), MVT::i32);
				1022	if (VT.bitsLT(MinVT))
				1023	VT = MinVT;
				1024	}
				1025
				1026	unsigned NumParts = TLI.getNumRegisters(ReturnType->getContext(), VT);
				1027	EVT PartVT = TLI.getRegisterType(ReturnType->getContext(), VT);
				1028	unsigned PartSize = TLI.getTargetData()->getTypeAllocSize(
				1029	PartVT.getTypeForEVT(ReturnType->getContext()));
				1030
				1031	// 'inreg' on function refers to return value
				1032	ISD::ArgFlagsTy Flags = ISD::ArgFlagsTy();
				1033	if (attr & Attribute::InReg)
				1034	Flags.setInReg();
				1035
				1036	// Propagate extension type if any
				1037	if (attr & Attribute::SExt)
				1038	Flags.setSExt();
				1039	else if (attr & Attribute::ZExt)
				1040	Flags.setZExt();
				1041
				1042	for (unsigned i = 0; i < NumParts; ++i) {
				1043	Outs.push_back(ISD::OutputArg(Flags, PartVT, /isFixed=/true));
				1044	if (Offsets) {
				1045	Offsets->push_back(Offset);
				1046	Offset += PartSize;
				1047	}
				1048	}
				1049	}
				1050	}
				1051
Evan Cheng	3ae0543	2008-01-24 00:22:01 +0000	[diff] [blame]	1052	/// getByValTypeAlignment - Return the desired alignment for ByVal aggregate
Dale Johannesen	28d08fd	2008-02-28 22:31:51 +0000	[diff] [blame]	1053	/// function arguments in the caller parameter area. This is the actual
				1054	/// alignment, not its logarithm.
Chris Lattner	db125cf	2011-07-18 04:54:35 +0000	[diff] [blame]	1055	unsigned TargetLowering::getByValTypeAlignment(Type *Ty) const {
Dale Johannesen	28d08fd	2008-02-28 22:31:51 +0000	[diff] [blame]	1056	return TD->getCallFrameTypeAlignment(Ty);
Evan Cheng	3ae0543	2008-01-24 00:22:01 +0000	[diff] [blame]	1057	}
				1058
Chris Lattner	071c62f	2010-01-25 23:26:13 +0000	[diff] [blame]	1059	/// getJumpTableEncoding - Return the entry encoding for a jump table in the
				1060	/// current function. The returned value is a member of the
				1061	/// MachineJumpTableInfo::JTEntryKind enum.
				1062	unsigned TargetLowering::getJumpTableEncoding() const {
				1063	// In non-pic modes, just use the address of a block.
				1064	if (getTargetMachine().getRelocationModel() != Reloc::PIC_)
				1065	return MachineJumpTableInfo::EK_BlockAddress;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1066
Chris Lattner	071c62f	2010-01-25 23:26:13 +0000	[diff] [blame]	1067	// In PIC mode, if the target supports a GPRel32 directive, use it.
				1068	if (getTargetMachine().getMCAsmInfo()->getGPRel32Directive() != 0)
				1069	return MachineJumpTableInfo::EK_GPRel32BlockAddress;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1070
Chris Lattner	071c62f	2010-01-25 23:26:13 +0000	[diff] [blame]	1071	// Otherwise, use a label difference.
				1072	return MachineJumpTableInfo::EK_LabelDifference32;
				1073	}
				1074
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1075	SDValue TargetLowering::getPICJumpTableRelocBase(SDValue Table,
				1076	SelectionDAG &DAG) const {
Chris Lattner	f1214cb	2010-01-26 06:53:37 +0000	[diff] [blame]	1077	// If our PIC model is GP relative, use the global offset table as the base.
Akira Hatanaka	787c3fd	2012-04-09 20:32:12 +0000	[diff] [blame]	1078	unsigned JTEncoding = getJumpTableEncoding();
				1079
				1080	if ((JTEncoding == MachineJumpTableInfo::EK_GPRel64BlockAddress) \|\|
				1081	(JTEncoding == MachineJumpTableInfo::EK_GPRel32BlockAddress))
Dale Johannesen	b300d2a	2009-02-07 00:55:49 +0000	[diff] [blame]	1082	return DAG.getGLOBAL_OFFSET_TABLE(getPointerTy());
Akira Hatanaka	787c3fd	2012-04-09 20:32:12 +0000	[diff] [blame]	1083
Evan Cheng	cc41586	2007-11-09 01:32:10 +0000	[diff] [blame]	1084	return Table;
				1085	}
				1086
Chris Lattner	13e97a2	2010-01-26 05:30:30 +0000	[diff] [blame]	1087	/// getPICJumpTableRelocBaseExpr - This returns the relocation base for the
				1088	/// given PIC jumptable, the same as getPICJumpTableRelocBase, but as an
				1089	/// MCExpr.
				1090	const MCExpr *
Chris Lattner	589c6f6	2010-01-26 06:28:43 +0000	[diff] [blame]	1091	TargetLowering::getPICJumpTableRelocBaseExpr(const MachineFunction *MF,
				1092	unsigned JTI,MCContext &Ctx) const{
Chris Lattner	beeb93e	2010-01-26 05:58:28 +0000	[diff] [blame]	1093	// The normal PIC reloc base is the label at the start of the jump table.
Chris Lattner	589c6f6	2010-01-26 06:28:43 +0000	[diff] [blame]	1094	return MCSymbolRefExpr::Create(MF->getJTISymbol(JTI, Ctx), Ctx);
Chris Lattner	13e97a2	2010-01-26 05:30:30 +0000	[diff] [blame]	1095	}
				1096
Dan Gohman	6520e20	2008-10-18 02:06:02 +0000	[diff] [blame]	1097	bool
				1098	TargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
				1099	// Assume that everything is safe in static mode.
				1100	if (getTargetMachine().getRelocationModel() == Reloc::Static)
				1101	return true;
				1102
				1103	// In dynamic-no-pic mode, assume that known defined values are safe.
				1104	if (getTargetMachine().getRelocationModel() == Reloc::DynamicNoPIC &&
				1105	GA &&
				1106	!GA->getGlobal()->isDeclaration() &&
Duncan Sands	667d4b8	2009-03-07 15:45:40 +0000	[diff] [blame]	1107	!GA->getGlobal()->isWeakForLinker())
Dan Gohman	6520e20	2008-10-18 02:06:02 +0000	[diff] [blame]	1108	return true;
				1109
				1110	// Otherwise assume nothing is safe.
				1111	return false;
				1112	}
				1113
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	1114	//===----------------------------------------------------------------------===//
				1115	// Optimization Methods
				1116	//===----------------------------------------------------------------------===//
				1117
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1118	/// ShrinkDemandedConstant - Check to see if the specified operand of the
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1119	/// specified instruction is a constant integer. If so, check to see if there
				1120	/// are any bits set in the constant that are not demanded. If so, shrink the
				1121	/// constant and return true.
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1122	bool TargetLowering::TargetLoweringOpt::ShrinkDemandedConstant(SDValue Op,
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1123	const APInt &Demanded) {
Dale Johannesen	de06470	2009-02-06 21:50:26 +0000	[diff] [blame]	1124	DebugLoc dl = Op.getDebugLoc();
Bill Wendling	36ae6c1	2009-03-04 00:18:06 +0000	[diff] [blame]	1125
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1126	// FIXME: ISD::SELECT, ISD::SELECT_CC
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	1127	switch (Op.getOpcode()) {
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1128	default: break;
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1129	case ISD::XOR:
Bill Wendling	36ae6c1	2009-03-04 00:18:06 +0000	[diff] [blame]	1130	case ISD::AND:
				1131	case ISD::OR: {
				1132	ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
				1133	if (!C) return false;
				1134
				1135	if (Op.getOpcode() == ISD::XOR &&
				1136	(C->getAPIntValue() \| (~Demanded)).isAllOnesValue())
				1137	return false;
				1138
				1139	// if we can expand it to have all bits set, do it
				1140	if (C->getAPIntValue().intersects(~Demanded)) {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1141	EVT VT = Op.getValueType();
Bill Wendling	36ae6c1	2009-03-04 00:18:06 +0000	[diff] [blame]	1142	SDValue New = DAG.getNode(Op.getOpcode(), dl, VT, Op.getOperand(0),
				1143	DAG.getConstant(Demanded &
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1144	C->getAPIntValue(),
Bill Wendling	36ae6c1	2009-03-04 00:18:06 +0000	[diff] [blame]	1145	VT));
				1146	return CombineTo(Op, New);
				1147	}
				1148
Nate Begeman	de99629	2006-02-03 22:24:05 +0000	[diff] [blame]	1149	break;
				1150	}
Bill Wendling	36ae6c1	2009-03-04 00:18:06 +0000	[diff] [blame]	1151	}
				1152
Nate Begeman	de99629	2006-02-03 22:24:05 +0000	[diff] [blame]	1153	return false;
				1154	}
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1155
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1156	/// ShrinkDemandedOp - Convert x+y to (VT)((SmallVT)x+(SmallVT)y) if the
				1157	/// casts are free. This uses isZExtFree and ZERO_EXTEND for the widening
				1158	/// cast, but it could be generalized for targets with other types of
				1159	/// implicit widening casts.
				1160	bool
				1161	TargetLowering::TargetLoweringOpt::ShrinkDemandedOp(SDValue Op,
				1162	unsigned BitWidth,
				1163	const APInt &Demanded,
				1164	DebugLoc dl) {
				1165	assert(Op.getNumOperands() == 2 &&
				1166	"ShrinkDemandedOp only supports binary operators!");
				1167	assert(Op.getNode()->getNumValues() == 1 &&
				1168	"ShrinkDemandedOp only supports nodes with one result!");
				1169
				1170	// Don't do this if the node has another user, which may require the
				1171	// full value.
				1172	if (!Op.getNode()->hasOneUse())
				1173	return false;
				1174
				1175	// Search for the smallest integer type with free casts to and from
				1176	// Op's type. For expedience, just check power-of-2 integer types.
				1177	const TargetLowering &TLI = DAG.getTargetLoweringInfo();
				1178	unsigned SmallVTBits = BitWidth - Demanded.countLeadingZeros();
				1179	if (!isPowerOf2_32(SmallVTBits))
				1180	SmallVTBits = NextPowerOf2(SmallVTBits);
				1181	for (; SmallVTBits < BitWidth; SmallVTBits = NextPowerOf2(SmallVTBits)) {
Owen Anderson	23b9b19	2009-08-12 00:36:31 +0000	[diff] [blame]	1182	EVT SmallVT = EVT::getIntegerVT(*DAG.getContext(), SmallVTBits);
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1183	if (TLI.isTruncateFree(Op.getValueType(), SmallVT) &&
				1184	TLI.isZExtFree(SmallVT, Op.getValueType())) {
				1185	// We found a type with free casts.
				1186	SDValue X = DAG.getNode(Op.getOpcode(), dl, SmallVT,
				1187	DAG.getNode(ISD::TRUNCATE, dl, SmallVT,
				1188	Op.getNode()->getOperand(0)),
				1189	DAG.getNode(ISD::TRUNCATE, dl, SmallVT,
				1190	Op.getNode()->getOperand(1)));
				1191	SDValue Z = DAG.getNode(ISD::ZERO_EXTEND, dl, Op.getValueType(), X);
				1192	return CombineTo(Op, Z);
				1193	}
				1194	}
				1195	return false;
				1196	}
				1197
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1198	/// SimplifyDemandedBits - Look at Op. At this point, we know that only the
Chad Rosier	8c1ec5a	2011-06-11 02:27:46 +0000	[diff] [blame]	1199	/// DemandedMask bits of the result of Op are ever used downstream. If we can
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1200	/// use this information to simplify Op, create a new simplified DAG node and
				1201	/// return true, returning the original and new nodes in Old and New. Otherwise,
				1202	/// analyze the expression and return a mask of KnownOne and KnownZero bits for
				1203	/// the expression (used to simplify the caller). The KnownZero/One bits may
				1204	/// only be accurate for those bits in the DemandedMask.
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1205	bool TargetLowering::SimplifyDemandedBits(SDValue Op,
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1206	const APInt &DemandedMask,
				1207	APInt &KnownZero,
				1208	APInt &KnownOne,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1209	TargetLoweringOpt &TLO,
				1210	unsigned Depth) const {
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1211	unsigned BitWidth = DemandedMask.getBitWidth();
Dan Gohman	87862e7	2009-12-11 21:31:27 +0000	[diff] [blame]	1212	assert(Op.getValueType().getScalarType().getSizeInBits() == BitWidth &&
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1213	"Mask size mismatches value type size!");
				1214	APInt NewMask = DemandedMask;
Dale Johannesen	6f38cb6	2009-02-07 19:59:05 +0000	[diff] [blame]	1215	DebugLoc dl = Op.getDebugLoc();
Chris Lattner	3fc5b01	2007-05-17 18:19:23 +0000	[diff] [blame]	1216
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1217	// Don't know anything.
				1218	KnownZero = KnownOne = APInt(BitWidth, 0);
				1219
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1220	// Other users may use these bits.
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1221	if (!Op.getNode()->hasOneUse()) {
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1222	if (Depth != 0) {
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1223	// If not at the root, Just compute the KnownZero/KnownOne bits to
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1224	// simplify things downstream.
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1225	TLO.DAG.ComputeMaskedBits(Op, KnownZero, KnownOne, Depth);
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1226	return false;
				1227	}
				1228	// If this is the root being simplified, allow it to have multiple uses,
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1229	// just set the NewMask to all bits.
				1230	NewMask = APInt::getAllOnesValue(BitWidth);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1231	} else if (DemandedMask == 0) {
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1232	// Not demanding any bits from Op.
				1233	if (Op.getOpcode() != ISD::UNDEF)
Dale Johannesen	e8d7230	2009-02-06 23:05:02 +0000	[diff] [blame]	1234	return TLO.CombineTo(Op, TLO.DAG.getUNDEF(Op.getValueType()));
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1235	return false;
				1236	} else if (Depth == 6) { // Limit search depth.
				1237	return false;
				1238	}
				1239
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1240	APInt KnownZero2, KnownOne2, KnownZeroOut, KnownOneOut;
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1241	switch (Op.getOpcode()) {
				1242	case ISD::Constant:
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1243	// We know all of the bits for a constant!
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1244	KnownOne = cast<ConstantSDNode>(Op)->getAPIntValue();
				1245	KnownZero = ~KnownOne;
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1246	return false; // Don't fall through, will infinitely loop.
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1247	case ISD::AND:
Chris Lattner	81cd355	2006-02-27 00:36:27 +0000	[diff] [blame]	1248	// If the RHS is a constant, check to see if the LHS would be zero without
				1249	// using the bits from the RHS. Below, we use knowledge about the RHS to
				1250	// simplify the LHS, here we're using information from the LHS to simplify
				1251	// the RHS.
				1252	if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1253	APInt LHSZero, LHSOne;
Dale Johannesen	97fd9a5	2011-01-10 21:53:07 +0000	[diff] [blame]	1254	// Do not increment Depth here; that can cause an infinite loop.
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1255	TLO.DAG.ComputeMaskedBits(Op.getOperand(0), LHSZero, LHSOne, Depth);
Chris Lattner	81cd355	2006-02-27 00:36:27 +0000	[diff] [blame]	1256	// If the LHS already has zeros where RHSC does, this and is dead.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1257	if ((LHSZero & NewMask) == (~RHSC->getAPIntValue() & NewMask))
Chris Lattner	81cd355	2006-02-27 00:36:27 +0000	[diff] [blame]	1258	return TLO.CombineTo(Op, Op.getOperand(0));
				1259	// If any of the set bits in the RHS are known zero on the LHS, shrink
				1260	// the constant.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1261	if (TLO.ShrinkDemandedConstant(Op, ~LHSZero & NewMask))
Chris Lattner	81cd355	2006-02-27 00:36:27 +0000	[diff] [blame]	1262	return true;
				1263	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1264
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1265	if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1266	KnownOne, TLO, Depth+1))
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1267	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1268	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1269	if (SimplifyDemandedBits(Op.getOperand(0), ~KnownZero & NewMask,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1270	KnownZero2, KnownOne2, TLO, Depth+1))
				1271	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1272	assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
				1273
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1274	// If all of the demanded bits are known one on one side, return the other.
				1275	// These bits cannot contribute to the result of the 'and'.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1276	if ((NewMask & ~KnownZero2 & KnownOne) == (~KnownZero2 & NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1277	return TLO.CombineTo(Op, Op.getOperand(0));
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1278	if ((NewMask & ~KnownZero & KnownOne2) == (~KnownZero & NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1279	return TLO.CombineTo(Op, Op.getOperand(1));
				1280	// If all of the demanded bits in the inputs are known zeros, return zero.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1281	if ((NewMask & (KnownZero\|KnownZero2)) == NewMask)
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1282	return TLO.CombineTo(Op, TLO.DAG.getConstant(0, Op.getValueType()));
				1283	// If the RHS is a constant, see if we can simplify it.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1284	if (TLO.ShrinkDemandedConstant(Op, ~KnownZero2 & NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1285	return true;
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1286	// If the operation can be done in a smaller type, do so.
Dan Gohman	4e39e9d	2010-06-24 14:30:44 +0000	[diff] [blame]	1287	if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1288	return true;
				1289
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1290	// Output known-1 bits are only known if set in both the LHS & RHS.
				1291	KnownOne &= KnownOne2;
				1292	// Output known-0 are known to be clear if zero in either the LHS \| RHS.
				1293	KnownZero \|= KnownZero2;
				1294	break;
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1295	case ISD::OR:
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1296	if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1297	KnownOne, TLO, Depth+1))
				1298	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1299	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1300	if (SimplifyDemandedBits(Op.getOperand(0), ~KnownOne & NewMask,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1301	KnownZero2, KnownOne2, TLO, Depth+1))
				1302	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1303	assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
				1304
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1305	// If all of the demanded bits are known zero on one side, return the other.
				1306	// These bits cannot contribute to the result of the 'or'.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1307	if ((NewMask & ~KnownOne2 & KnownZero) == (~KnownOne2 & NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1308	return TLO.CombineTo(Op, Op.getOperand(0));
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1309	if ((NewMask & ~KnownOne & KnownZero2) == (~KnownOne & NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1310	return TLO.CombineTo(Op, Op.getOperand(1));
				1311	// If all of the potentially set bits on one side are known to be set on
				1312	// the other side, just use the 'other' side.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1313	if ((NewMask & ~KnownZero & KnownOne2) == (~KnownZero & NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1314	return TLO.CombineTo(Op, Op.getOperand(0));
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1315	if ((NewMask & ~KnownZero2 & KnownOne) == (~KnownZero2 & NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1316	return TLO.CombineTo(Op, Op.getOperand(1));
				1317	// If the RHS is a constant, see if we can simplify it.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1318	if (TLO.ShrinkDemandedConstant(Op, NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1319	return true;
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1320	// If the operation can be done in a smaller type, do so.
Dan Gohman	4e39e9d	2010-06-24 14:30:44 +0000	[diff] [blame]	1321	if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1322	return true;
				1323
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1324	// Output known-0 bits are only known if clear in both the LHS & RHS.
				1325	KnownZero &= KnownZero2;
				1326	// Output known-1 are known to be set if set in either the LHS \| RHS.
				1327	KnownOne \|= KnownOne2;
				1328	break;
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1329	case ISD::XOR:
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1330	if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1331	KnownOne, TLO, Depth+1))
				1332	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1333	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1334	if (SimplifyDemandedBits(Op.getOperand(0), NewMask, KnownZero2,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1335	KnownOne2, TLO, Depth+1))
				1336	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1337	assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
				1338
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1339	// If all of the demanded bits are known zero on one side, return the other.
				1340	// These bits cannot contribute to the result of the 'xor'.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1341	if ((KnownZero & NewMask) == NewMask)
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1342	return TLO.CombineTo(Op, Op.getOperand(0));
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1343	if ((KnownZero2 & NewMask) == NewMask)
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1344	return TLO.CombineTo(Op, Op.getOperand(1));
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1345	// If the operation can be done in a smaller type, do so.
Dan Gohman	4e39e9d	2010-06-24 14:30:44 +0000	[diff] [blame]	1346	if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1347	return true;
				1348
Chris Lattner	3687c1a	2006-11-27 21:50:02 +0000	[diff] [blame]	1349	// If all of the unknown bits are known to be zero on one side or the other
				1350	// (but not both) turn this into an inclusive or.
				1351	// e.g. (A & C1)^(B & C2) -> (A & C1)\|(B & C2) iff C1&C2 == 0
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1352	if ((NewMask & ~KnownZero & ~KnownZero2) == 0)
Dale Johannesen	de06470	2009-02-06 21:50:26 +0000	[diff] [blame]	1353	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::OR, dl, Op.getValueType(),
Chris Lattner	3687c1a	2006-11-27 21:50:02 +0000	[diff] [blame]	1354	Op.getOperand(0),
				1355	Op.getOperand(1)));
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1356
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1357	// Output known-0 bits are known if clear or set in both the LHS & RHS.
				1358	KnownZeroOut = (KnownZero & KnownZero2) \| (KnownOne & KnownOne2);
				1359	// Output known-1 are known to be set if set in only one of the LHS, RHS.
				1360	KnownOneOut = (KnownZero & KnownOne2) \| (KnownOne & KnownZero2);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1361
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1362	// If all of the demanded bits on one side are known, and all of the set
				1363	// bits on that side are also known to be set on the other side, turn this
				1364	// into an AND, as we know the bits will be cleared.
				1365	// e.g. (X \| C1) ^ C2 --> (X \| C1) & ~C2 iff (C1&C2) == C2
Joel Jones	d16ce17	2012-04-17 22:23:10 +0000	[diff] [blame]	1366	// NB: it is okay if more bits are known than are requested
				1367	if ((NewMask & (KnownZero\|KnownOne)) == NewMask) { // all known on one side
				1368	if (KnownOne == KnownOne2) { // set bits are the same on both sides
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1369	EVT VT = Op.getValueType();
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1370	SDValue ANDC = TLO.DAG.getConstant(~KnownOne & NewMask, VT);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1371	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::AND, dl, VT,
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1372	Op.getOperand(0), ANDC));
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1373	}
				1374	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1375
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1376	// If the RHS is a constant, see if we can simplify it.
Torok Edwin	4fea2e9	2008-04-06 21:23:02 +0000	[diff] [blame]	1377	// for XOR, we prefer to force bits to 1 if they will make a -1.
				1378	// if we can't force bits, try to shrink constant
				1379	if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
				1380	APInt Expanded = C->getAPIntValue() \| (~NewMask);
				1381	// if we can expand it to have all bits set, do it
				1382	if (Expanded.isAllOnesValue()) {
				1383	if (Expanded != C->getAPIntValue()) {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1384	EVT VT = Op.getValueType();
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1385	SDValue New = TLO.DAG.getNode(Op.getOpcode(), dl,VT, Op.getOperand(0),
Torok Edwin	4fea2e9	2008-04-06 21:23:02 +0000	[diff] [blame]	1386	TLO.DAG.getConstant(Expanded, VT));
				1387	return TLO.CombineTo(Op, New);
				1388	}
				1389	// if it already has all the bits set, nothing to change
				1390	// but don't shrink either!
				1391	} else if (TLO.ShrinkDemandedConstant(Op, NewMask)) {
				1392	return true;
				1393	}
				1394	}
				1395
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1396	KnownZero = KnownZeroOut;
				1397	KnownOne = KnownOneOut;
				1398	break;
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1399	case ISD::SELECT:
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1400	if (SimplifyDemandedBits(Op.getOperand(2), NewMask, KnownZero,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1401	KnownOne, TLO, Depth+1))
				1402	return true;
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1403	if (SimplifyDemandedBits(Op.getOperand(1), NewMask, KnownZero2,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1404	KnownOne2, TLO, Depth+1))
				1405	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1406	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
				1407	assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
				1408
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1409	// If the operands are constants, see if we can simplify them.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1410	if (TLO.ShrinkDemandedConstant(Op, NewMask))
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1411	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1412
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1413	// Only known if known in both the LHS and RHS.
				1414	KnownOne &= KnownOne2;
				1415	KnownZero &= KnownZero2;
				1416	break;
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1417	case ISD::SELECT_CC:
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1418	if (SimplifyDemandedBits(Op.getOperand(3), NewMask, KnownZero,
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1419	KnownOne, TLO, Depth+1))
				1420	return true;
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1421	if (SimplifyDemandedBits(Op.getOperand(2), NewMask, KnownZero2,
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1422	KnownOne2, TLO, Depth+1))
				1423	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1424	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
				1425	assert((KnownZero2 & KnownOne2) == 0 && "Bits known to be one AND zero?");
				1426
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1427	// If the operands are constants, see if we can simplify them.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1428	if (TLO.ShrinkDemandedConstant(Op, NewMask))
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1429	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1430
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1431	// Only known if known in both the LHS and RHS.
				1432	KnownOne &= KnownOne2;
				1433	KnownZero &= KnownZero2;
				1434	break;
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1435	case ISD::SHL:
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1436	if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	1437	unsigned ShAmt = SA->getZExtValue();
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1438	SDValue InOp = Op.getOperand(0);
Chris Lattner	895c4ab	2007-04-17 21:14:16 +0000	[diff] [blame]	1439
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1440	// If the shift count is an invalid immediate, don't do anything.
				1441	if (ShAmt >= BitWidth)
				1442	break;
				1443
Chris Lattner	895c4ab	2007-04-17 21:14:16 +0000	[diff] [blame]	1444	// If this is ((X >>u C1) << ShAmt), see if we can simplify this into a
				1445	// single shift. We can do this if the bottom bits (which are shifted
				1446	// out) are never demanded.
				1447	if (InOp.getOpcode() == ISD::SRL &&
				1448	isa<ConstantSDNode>(InOp.getOperand(1))) {
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1449	if (ShAmt && (NewMask & APInt::getLowBitsSet(BitWidth, ShAmt)) == 0) {
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	1450	unsigned C1= cast<ConstantSDNode>(InOp.getOperand(1))->getZExtValue();
Chris Lattner	895c4ab	2007-04-17 21:14:16 +0000	[diff] [blame]	1451	unsigned Opc = ISD::SHL;
				1452	int Diff = ShAmt-C1;
				1453	if (Diff < 0) {
				1454	Diff = -Diff;
				1455	Opc = ISD::SRL;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1456	}
				1457
				1458	SDValue NewSA =
Chris Lattner	4e7e6cd	2007-05-30 16:30:06 +0000	[diff] [blame]	1459	TLO.DAG.getConstant(Diff, Op.getOperand(1).getValueType());
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1460	EVT VT = Op.getValueType();
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1461	return TLO.CombineTo(Op, TLO.DAG.getNode(Opc, dl, VT,
Chris Lattner	895c4ab	2007-04-17 21:14:16 +0000	[diff] [blame]	1462	InOp.getOperand(0), NewSA));
				1463	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1464	}
				1465
Dan Gohman	a4f4d69	2010-07-23 18:03:30 +0000	[diff] [blame]	1466	if (SimplifyDemandedBits(InOp, NewMask.lshr(ShAmt),
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1467	KnownZero, KnownOne, TLO, Depth+1))
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1468	return true;
Dan Gohman	a4f4d69	2010-07-23 18:03:30 +0000	[diff] [blame]	1469
				1470	// Convert (shl (anyext x, c)) to (anyext (shl x, c)) if the high bits
				1471	// are not demanded. This will likely allow the anyext to be folded away.
				1472	if (InOp.getNode()->getOpcode() == ISD::ANY_EXTEND) {
				1473	SDValue InnerOp = InOp.getNode()->getOperand(0);
				1474	EVT InnerVT = InnerOp.getValueType();
Eli Friedman	2dd0353	2011-12-09 01:16:26 +0000	[diff] [blame]	1475	unsigned InnerBits = InnerVT.getSizeInBits();
				1476	if (ShAmt < InnerBits && NewMask.lshr(InnerBits) == 0 &&
Dan Gohman	a4f4d69	2010-07-23 18:03:30 +0000	[diff] [blame]	1477	isTypeDesirableForOp(ISD::SHL, InnerVT)) {
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	1478	EVT ShTy = getShiftAmountTy(InnerVT);
Dan Gohman	cd20c6f	2010-07-23 21:08:12 +0000	[diff] [blame]	1479	if (!APInt(BitWidth, ShAmt).isIntN(ShTy.getSizeInBits()))
				1480	ShTy = InnerVT;
Dan Gohman	a4f4d69	2010-07-23 18:03:30 +0000	[diff] [blame]	1481	SDValue NarrowShl =
				1482	TLO.DAG.getNode(ISD::SHL, dl, InnerVT, InnerOp,
Dan Gohman	cd20c6f	2010-07-23 21:08:12 +0000	[diff] [blame]	1483	TLO.DAG.getConstant(ShAmt, ShTy));
Dan Gohman	a4f4d69	2010-07-23 18:03:30 +0000	[diff] [blame]	1484	return
				1485	TLO.CombineTo(Op,
				1486	TLO.DAG.getNode(ISD::ANY_EXTEND, dl, Op.getValueType(),
				1487	NarrowShl));
				1488	}
				1489	}
				1490
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	1491	KnownZero <<= SA->getZExtValue();
				1492	KnownOne <<= SA->getZExtValue();
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1493	// low bits known zero.
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	1494	KnownZero \|= APInt::getLowBitsSet(BitWidth, SA->getZExtValue());
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1495	}
				1496	break;
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1497	case ISD::SRL:
				1498	if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1499	EVT VT = Op.getValueType();
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	1500	unsigned ShAmt = SA->getZExtValue();
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	1501	unsigned VTSize = VT.getSizeInBits();
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1502	SDValue InOp = Op.getOperand(0);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1503
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1504	// If the shift count is an invalid immediate, don't do anything.
				1505	if (ShAmt >= BitWidth)
				1506	break;
				1507
Chris Lattner	895c4ab	2007-04-17 21:14:16 +0000	[diff] [blame]	1508	// If this is ((X << C1) >>u ShAmt), see if we can simplify this into a
				1509	// single shift. We can do this if the top bits (which are shifted out)
				1510	// are never demanded.
				1511	if (InOp.getOpcode() == ISD::SHL &&
				1512	isa<ConstantSDNode>(InOp.getOperand(1))) {
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1513	if (ShAmt && (NewMask & APInt::getHighBitsSet(VTSize, ShAmt)) == 0) {
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	1514	unsigned C1= cast<ConstantSDNode>(InOp.getOperand(1))->getZExtValue();
Chris Lattner	895c4ab	2007-04-17 21:14:16 +0000	[diff] [blame]	1515	unsigned Opc = ISD::SRL;
				1516	int Diff = ShAmt-C1;
				1517	if (Diff < 0) {
				1518	Diff = -Diff;
				1519	Opc = ISD::SHL;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1520	}
				1521
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1522	SDValue NewSA =
Chris Lattner	8c7d2d5	2007-04-17 22:53:02 +0000	[diff] [blame]	1523	TLO.DAG.getConstant(Diff, Op.getOperand(1).getValueType());
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1524	return TLO.CombineTo(Op, TLO.DAG.getNode(Opc, dl, VT,
Chris Lattner	895c4ab	2007-04-17 21:14:16 +0000	[diff] [blame]	1525	InOp.getOperand(0), NewSA));
				1526	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1527	}
				1528
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1529	// Compute the new bits that are at the top now.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1530	if (SimplifyDemandedBits(InOp, (NewMask << ShAmt),
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1531	KnownZero, KnownOne, TLO, Depth+1))
				1532	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1533	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1534	KnownZero = KnownZero.lshr(ShAmt);
				1535	KnownOne = KnownOne.lshr(ShAmt);
Chris Lattner	c4fa603	2006-06-13 16:52:37 +0000	[diff] [blame]	1536
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1537	APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt);
Chris Lattner	c4fa603	2006-06-13 16:52:37 +0000	[diff] [blame]	1538	KnownZero \|= HighBits; // High bits known zero.
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1539	}
				1540	break;
				1541	case ISD::SRA:
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	1542	// If this is an arithmetic shift right and only the low-bit is set, we can
				1543	// always convert this into a logical shr, even if the shift amount is
				1544	// variable. The low bit of the shift cannot be an input sign bit unless
				1545	// the shift amount is >= the size of the datatype, which is undefined.
Eli Friedman	2dd0353	2011-12-09 01:16:26 +0000	[diff] [blame]	1546	if (NewMask == 1)
Evan Cheng	e5b51ac	2010-04-17 06:13:15 +0000	[diff] [blame]	1547	return TLO.CombineTo(Op,
				1548	TLO.DAG.getNode(ISD::SRL, dl, Op.getValueType(),
				1549	Op.getOperand(0), Op.getOperand(1)));
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	1550
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1551	if (ConstantSDNode *SA = dyn_cast<ConstantSDNode>(Op.getOperand(1))) {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1552	EVT VT = Op.getValueType();
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	1553	unsigned ShAmt = SA->getZExtValue();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1554
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1555	// If the shift count is an invalid immediate, don't do anything.
				1556	if (ShAmt >= BitWidth)
				1557	break;
				1558
				1559	APInt InDemandedMask = (NewMask << ShAmt);
Chris Lattner	1b73713	2006-05-08 17:22:53 +0000	[diff] [blame]	1560
				1561	// If any of the demanded bits are produced by the sign extension, we also
				1562	// demand the input sign bit.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1563	APInt HighBits = APInt::getHighBitsSet(BitWidth, ShAmt);
				1564	if (HighBits.intersects(NewMask))
Dan Gohman	87862e7	2009-12-11 21:31:27 +0000	[diff] [blame]	1565	InDemandedMask \|= APInt::getSignBit(VT.getScalarType().getSizeInBits());
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1566
Chris Lattner	1b73713	2006-05-08 17:22:53 +0000	[diff] [blame]	1567	if (SimplifyDemandedBits(Op.getOperand(0), InDemandedMask,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1568	KnownZero, KnownOne, TLO, Depth+1))
				1569	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1570	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1571	KnownZero = KnownZero.lshr(ShAmt);
				1572	KnownOne = KnownOne.lshr(ShAmt);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1573
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1574	// Handle the sign bit, adjusted to where it is now in the mask.
				1575	APInt SignBit = APInt::getSignBit(BitWidth).lshr(ShAmt);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1576
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1577	// If the input sign bit is known to be zero, or if none of the top bits
				1578	// are demanded, turn this into an unsigned shift right.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1579	if (KnownZero.intersects(SignBit) \|\| (HighBits & ~NewMask) == HighBits) {
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1580	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::SRL, dl, VT,
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1581	Op.getOperand(0),
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1582	Op.getOperand(1)));
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1583	} else if (KnownOne.intersects(SignBit)) { // New bits are known one.
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1584	KnownOne \|= HighBits;
				1585	}
				1586	}
				1587	break;
				1588	case ISD::SIGN_EXTEND_INREG: {
Nadav Rotem	cc61656	2012-01-15 19:27:55 +0000	[diff] [blame]	1589	EVT ExVT = cast<VTSDNode>(Op.getOperand(1))->getVT();
				1590
				1591	APInt MsbMask = APInt::getHighBitsSet(BitWidth, 1);
				1592	// If we only care about the highest bit, don't bother shifting right.
Eli Friedman	d49db36	2012-01-31 01:08:03 +0000	[diff] [blame]	1593	if (MsbMask == DemandedMask) {
Nadav Rotem	cc61656	2012-01-15 19:27:55 +0000	[diff] [blame]	1594	unsigned ShAmt = ExVT.getScalarType().getSizeInBits();
				1595	SDValue InOp = Op.getOperand(0);
Eli Friedman	d49db36	2012-01-31 01:08:03 +0000	[diff] [blame]	1596
				1597	// Compute the correct shift amount type, which must be getShiftAmountTy
				1598	// for scalar types after legalization.
				1599	EVT ShiftAmtTy = Op.getValueType();
				1600	if (TLO.LegalTypes() && !ShiftAmtTy.isVector())
				1601	ShiftAmtTy = getShiftAmountTy(ShiftAmtTy);
				1602
				1603	SDValue ShiftAmt = TLO.DAG.getConstant(BitWidth - ShAmt, ShiftAmtTy);
Nadav Rotem	cc61656	2012-01-15 19:27:55 +0000	[diff] [blame]	1604	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::SHL, dl,
				1605	Op.getValueType(), InOp, ShiftAmt));
				1606	}
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1607
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1608	// Sign extension. Compute the demanded bits in the result that are not
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1609	// present in the input.
Dan Gohman	d199636	2010-01-09 02:13:55 +0000	[diff] [blame]	1610	APInt NewBits =
				1611	APInt::getHighBitsSet(BitWidth,
Nadav Rotem	cc61656	2012-01-15 19:27:55 +0000	[diff] [blame]	1612	BitWidth - ExVT.getScalarType().getSizeInBits());
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1613
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1614	// If none of the extended bits are demanded, eliminate the sextinreg.
Eli Friedman	1d17d19	2010-08-02 04:42:25 +0000	[diff] [blame]	1615	if ((NewBits & NewMask) == 0)
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1616	return TLO.CombineTo(Op, Op.getOperand(0));
				1617
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1618	APInt InSignBit =
Nadav Rotem	cc61656	2012-01-15 19:27:55 +0000	[diff] [blame]	1619	APInt::getSignBit(ExVT.getScalarType().getSizeInBits()).zext(BitWidth);
Dan Gohman	d199636	2010-01-09 02:13:55 +0000	[diff] [blame]	1620	APInt InputDemandedBits =
				1621	APInt::getLowBitsSet(BitWidth,
Nadav Rotem	cc61656	2012-01-15 19:27:55 +0000	[diff] [blame]	1622	ExVT.getScalarType().getSizeInBits()) &
Dan Gohman	d199636	2010-01-09 02:13:55 +0000	[diff] [blame]	1623	NewMask;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1624
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1625	// Since the sign extended bits are demanded, we know that the sign
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1626	// bit is demanded.
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1627	InputDemandedBits \|= InSignBit;
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1628
				1629	if (SimplifyDemandedBits(Op.getOperand(0), InputDemandedBits,
				1630	KnownZero, KnownOne, TLO, Depth+1))
				1631	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1632	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1633
				1634	// If the sign bit of the input is known set or clear, then we know the
				1635	// top bits of the result.
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1636
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1637	// If the input sign bit is known zero, convert this into a zero extension.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1638	if (KnownZero.intersects(InSignBit))
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1639	return TLO.CombineTo(Op,
Nadav Rotem	cc61656	2012-01-15 19:27:55 +0000	[diff] [blame]	1640	TLO.DAG.getZeroExtendInReg(Op.getOperand(0),dl,ExVT));
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1641
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1642	if (KnownOne.intersects(InSignBit)) { // Input sign bit known set
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1643	KnownOne \|= NewBits;
				1644	KnownZero &= ~NewBits;
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1645	} else { // Input sign bit unknown
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1646	KnownZero &= ~NewBits;
				1647	KnownOne &= ~NewBits;
				1648	}
				1649	break;
				1650	}
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1651	case ISD::ZERO_EXTEND: {
Dan Gohman	d199636	2010-01-09 02:13:55 +0000	[diff] [blame]	1652	unsigned OperandBitWidth =
				1653	Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1654	APInt InMask = NewMask.trunc(OperandBitWidth);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1655
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1656	// If none of the top bits are demanded, convert this into an any_extend.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1657	APInt NewBits =
				1658	APInt::getHighBitsSet(BitWidth, BitWidth - OperandBitWidth) & NewMask;
				1659	if (!NewBits.intersects(NewMask))
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1660	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::ANY_EXTEND, dl,
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1661	Op.getValueType(),
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1662	Op.getOperand(0)));
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1663
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1664	if (SimplifyDemandedBits(Op.getOperand(0), InMask,
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1665	KnownZero, KnownOne, TLO, Depth+1))
				1666	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1667	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1668	KnownZero = KnownZero.zext(BitWidth);
				1669	KnownOne = KnownOne.zext(BitWidth);
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1670	KnownZero \|= NewBits;
				1671	break;
				1672	}
				1673	case ISD::SIGN_EXTEND: {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1674	EVT InVT = Op.getOperand(0).getValueType();
Dan Gohman	d199636	2010-01-09 02:13:55 +0000	[diff] [blame]	1675	unsigned InBits = InVT.getScalarType().getSizeInBits();
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1676	APInt InMask = APInt::getLowBitsSet(BitWidth, InBits);
Dan Gohman	9736028	2008-03-11 21:29:43 +0000	[diff] [blame]	1677	APInt InSignBit = APInt::getBitsSet(BitWidth, InBits - 1, InBits);
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1678	APInt NewBits = ~InMask & NewMask;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1679
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1680	// If none of the top bits are demanded, convert this into an any_extend.
				1681	if (NewBits == 0)
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1682	return TLO.CombineTo(Op,TLO.DAG.getNode(ISD::ANY_EXTEND, dl,
				1683	Op.getValueType(),
				1684	Op.getOperand(0)));
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1685
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1686	// Since some of the sign extended bits are demanded, we know that the sign
				1687	// bit is demanded.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1688	APInt InDemandedBits = InMask & NewMask;
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1689	InDemandedBits \|= InSignBit;
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1690	InDemandedBits = InDemandedBits.trunc(InBits);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1691
				1692	if (SimplifyDemandedBits(Op.getOperand(0), InDemandedBits, KnownZero,
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1693	KnownOne, TLO, Depth+1))
				1694	return true;
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1695	KnownZero = KnownZero.zext(BitWidth);
				1696	KnownOne = KnownOne.zext(BitWidth);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1697
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1698	// If the sign bit is known zero, convert this to a zero extend.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1699	if (KnownZero.intersects(InSignBit))
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1700	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::ZERO_EXTEND, dl,
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1701	Op.getValueType(),
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1702	Op.getOperand(0)));
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1703
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1704	// If the sign bit is known one, the top bits match.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1705	if (KnownOne.intersects(InSignBit)) {
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1706	KnownOne \|= NewBits;
				1707	assert((KnownZero & NewBits) == 0);
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1708	} else { // Otherwise, top bits aren't known.
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1709	assert((KnownOne & NewBits) == 0);
				1710	assert((KnownZero & NewBits) == 0);
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1711	}
				1712	break;
				1713	}
				1714	case ISD::ANY_EXTEND: {
Dan Gohman	d199636	2010-01-09 02:13:55 +0000	[diff] [blame]	1715	unsigned OperandBitWidth =
				1716	Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1717	APInt InMask = NewMask.trunc(OperandBitWidth);
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1718	if (SimplifyDemandedBits(Op.getOperand(0), InMask,
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1719	KnownZero, KnownOne, TLO, Depth+1))
				1720	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1721	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1722	KnownZero = KnownZero.zext(BitWidth);
				1723	KnownOne = KnownOne.zext(BitWidth);
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1724	break;
				1725	}
Chris Lattner	fe8babf	2006-05-05 22:32:12 +0000	[diff] [blame]	1726	case ISD::TRUNCATE: {
Chris Lattner	c93dfda	2006-05-06 00:11:52 +0000	[diff] [blame]	1727	// Simplify the input, using demanded bit information, and compute the known
				1728	// zero/one bits live out.
Dan Gohman	042919c	2010-03-01 17:59:21 +0000	[diff] [blame]	1729	unsigned OperandBitWidth =
				1730	Op.getOperand(0).getValueType().getScalarType().getSizeInBits();
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1731	APInt TruncMask = NewMask.zext(OperandBitWidth);
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1732	if (SimplifyDemandedBits(Op.getOperand(0), TruncMask,
Chris Lattner	fe8babf	2006-05-05 22:32:12 +0000	[diff] [blame]	1733	KnownZero, KnownOne, TLO, Depth+1))
				1734	return true;
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1735	KnownZero = KnownZero.trunc(BitWidth);
				1736	KnownOne = KnownOne.trunc(BitWidth);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1737
Chris Lattner	c93dfda	2006-05-06 00:11:52 +0000	[diff] [blame]	1738	// If the input is only used by this truncate, see if we can shrink it based
				1739	// on the known demanded bits.
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	1740	if (Op.getOperand(0).getNode()->hasOneUse()) {
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1741	SDValue In = Op.getOperand(0);
Chris Lattner	c93dfda	2006-05-06 00:11:52 +0000	[diff] [blame]	1742	switch (In.getOpcode()) {
				1743	default: break;
				1744	case ISD::SRL:
				1745	// Shrink SRL by a constant if none of the high bits shifted in are
				1746	// demanded.
Evan Cheng	e5b51ac	2010-04-17 06:13:15 +0000	[diff] [blame]	1747	if (TLO.LegalTypes() &&
				1748	!isTypeDesirableForOp(ISD::SRL, Op.getValueType()))
				1749	// Do not turn (vt1 truncate (vt2 srl)) into (vt1 srl) if vt1 is
				1750	// undesirable.
				1751	break;
				1752	ConstantSDNode *ShAmt = dyn_cast<ConstantSDNode>(In.getOperand(1));
				1753	if (!ShAmt)
				1754	break;
Owen Anderson	7adf862	2011-04-13 23:22:23 +0000	[diff] [blame]	1755	SDValue Shift = In.getOperand(1);
				1756	if (TLO.LegalTypes()) {
				1757	uint64_t ShVal = ShAmt->getZExtValue();
				1758	Shift =
				1759	TLO.DAG.getConstant(ShVal, getShiftAmountTy(Op.getValueType()));
				1760	}
				1761
Evan Cheng	e5b51ac	2010-04-17 06:13:15 +0000	[diff] [blame]	1762	APInt HighBits = APInt::getHighBitsSet(OperandBitWidth,
				1763	OperandBitWidth - BitWidth);
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	1764	HighBits = HighBits.lshr(ShAmt->getZExtValue()).trunc(BitWidth);
Evan Cheng	e5b51ac	2010-04-17 06:13:15 +0000	[diff] [blame]	1765
				1766	if (ShAmt->getZExtValue() < BitWidth && !(HighBits & NewMask)) {
				1767	// None of the shifted in bits are needed. Add a truncate of the
				1768	// shift input, then shift it.
				1769	SDValue NewTrunc = TLO.DAG.getNode(ISD::TRUNCATE, dl,
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1770	Op.getValueType(),
Evan Cheng	e5b51ac	2010-04-17 06:13:15 +0000	[diff] [blame]	1771	In.getOperand(0));
				1772	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::SRL, dl,
				1773	Op.getValueType(),
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1774	NewTrunc,
Owen Anderson	7adf862	2011-04-13 23:22:23 +0000	[diff] [blame]	1775	Shift));
Chris Lattner	c93dfda	2006-05-06 00:11:52 +0000	[diff] [blame]	1776	}
				1777	break;
				1778	}
				1779	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1780
				1781	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Chris Lattner	fe8babf	2006-05-05 22:32:12 +0000	[diff] [blame]	1782	break;
				1783	}
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1784	case ISD::AssertZext: {
Owen Anderson	7ab15f6	2011-09-03 00:26:49 +0000	[diff] [blame]	1785	// AssertZext demands all of the high bits, plus any of the low bits
				1786	// demanded by its users.
				1787	EVT VT = cast<VTSDNode>(Op.getOperand(1))->getVT();
				1788	APInt InMask = APInt::getLowBitsSet(BitWidth,
				1789	VT.getSizeInBits());
				1790	if (SimplifyDemandedBits(Op.getOperand(0), ~InMask \| NewMask,
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1791	KnownZero, KnownOne, TLO, Depth+1))
				1792	return true;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1793	assert((KnownZero & KnownOne) == 0 && "Bits known to be one AND zero?");
Dan Gohman	400f75c	2010-06-03 20:21:33 +0000	[diff] [blame]	1794
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1795	KnownZero \|= ~InMask & NewMask;
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1796	break;
				1797	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1798	case ISD::BITCAST:
Stuart Hastings	57f1fde	2011-06-06 16:44:31 +0000	[diff] [blame]	1799	// If this is an FP->Int bitcast and if the sign bit is the only
				1800	// thing demanded, turn this into a FGETSIGN.
Eli Friedman	ca072a3	2011-12-15 02:07:20 +0000	[diff] [blame]	1801	if (!TLO.LegalOperations() &&
				1802	!Op.getValueType().isVector() &&
Eli Friedman	0948f0a	2011-11-09 22:25:12 +0000	[diff] [blame]	1803	!Op.getOperand(0).getValueType().isVector() &&
Nadav Rotem	0c3e678	2011-06-12 14:56:55 +0000	[diff] [blame]	1804	NewMask == APInt::getSignBit(Op.getValueType().getSizeInBits()) &&
				1805	Op.getOperand(0).getValueType().isFloatingPoint()) {
Stuart Hastings	57f1fde	2011-06-06 16:44:31 +0000	[diff] [blame]	1806	bool OpVTLegal = isOperationLegalOrCustom(ISD::FGETSIGN, Op.getValueType());
				1807	bool i32Legal = isOperationLegalOrCustom(ISD::FGETSIGN, MVT::i32);
				1808	if ((OpVTLegal \|\| i32Legal) && Op.getValueType().isSimple()) {
				1809	EVT Ty = OpVTLegal ? Op.getValueType() : MVT::i32;
Chris Lattner	2ceb2cf	2007-12-22 21:35:38 +0000	[diff] [blame]	1810	// Make a FGETSIGN + SHL to move the sign bit into the appropriate
				1811	// place. We expect the SHL to be eliminated by other optimizations.
Stuart Hastings	090bf19	2011-06-01 18:32:25 +0000	[diff] [blame]	1812	SDValue Sign = TLO.DAG.getNode(ISD::FGETSIGN, dl, Ty, Op.getOperand(0));
Stuart Hastings	57f1fde	2011-06-06 16:44:31 +0000	[diff] [blame]	1813	unsigned OpVTSizeInBits = Op.getValueType().getSizeInBits();
				1814	if (!OpVTLegal && OpVTSizeInBits > 32)
Stuart Hastings	090bf19	2011-06-01 18:32:25 +0000	[diff] [blame]	1815	Sign = TLO.DAG.getNode(ISD::ZERO_EXTEND, dl, Op.getValueType(), Sign);
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	1816	unsigned ShVal = Op.getValueType().getSizeInBits()-1;
Stuart Hastings	bdce372	2011-06-01 14:04:17 +0000	[diff] [blame]	1817	SDValue ShAmt = TLO.DAG.getConstant(ShVal, Op.getValueType());
Stuart Hastings	3dfc4b12	2011-05-19 18:48:20 +0000	[diff] [blame]	1818	return TLO.CombineTo(Op, TLO.DAG.getNode(ISD::SHL, dl,
				1819	Op.getValueType(),
Chris Lattner	2ceb2cf	2007-12-22 21:35:38 +0000	[diff] [blame]	1820	Sign, ShAmt));
				1821	}
				1822	}
Chris Lattner	2ceb2cf	2007-12-22 21:35:38 +0000	[diff] [blame]	1823	break;
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1824	case ISD::ADD:
				1825	case ISD::MUL:
				1826	case ISD::SUB: {
				1827	// Add, Sub, and Mul don't demand any bits in positions beyond that
				1828	// of the highest bit demanded of them.
				1829	APInt LoMask = APInt::getLowBitsSet(BitWidth,
				1830	BitWidth - NewMask.countLeadingZeros());
				1831	if (SimplifyDemandedBits(Op.getOperand(0), LoMask, KnownZero2,
				1832	KnownOne2, TLO, Depth+1))
				1833	return true;
				1834	if (SimplifyDemandedBits(Op.getOperand(1), LoMask, KnownZero2,
				1835	KnownOne2, TLO, Depth+1))
				1836	return true;
				1837	// See if the operation should be performed at a smaller bit width.
Dan Gohman	4e39e9d	2010-06-24 14:30:44 +0000	[diff] [blame]	1838	if (TLO.ShrinkDemandedOp(Op, BitWidth, NewMask, dl))
Dan Gohman	97121ba	2009-04-08 00:15:30 +0000	[diff] [blame]	1839	return true;
				1840	}
				1841	// FALL THROUGH
Dan Gohman	54eed37	2008-05-06 00:53:29 +0000	[diff] [blame]	1842	default:
Chris Lattner	1482b5f	2006-04-02 06:15:09 +0000	[diff] [blame]	1843	// Just use ComputeMaskedBits to compute output bits.
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1844	TLO.DAG.ComputeMaskedBits(Op, KnownZero, KnownOne, Depth);
Chris Lattner	a6bc5a4	2006-02-27 01:00:42 +0000	[diff] [blame]	1845	break;
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1846	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1847
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1848	// If we know the value of all of the demanded bits, return this as a
				1849	// constant.
Dan Gohman	7b8d4a9	2008-02-27 00:25:32 +0000	[diff] [blame]	1850	if ((NewMask & (KnownZero\|KnownOne)) == NewMask)
Chris Lattner	ec66515	2006-02-26 23:36:02 +0000	[diff] [blame]	1851	return TLO.CombineTo(Op, TLO.DAG.getConstant(KnownOne, Op.getValueType()));
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1852
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1853	return false;
				1854	}
				1855
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1856	/// computeMaskedBitsForTargetNode - Determine which of the bits specified
				1857	/// in Mask are known to be either zero or one and return them in the
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1858	/// KnownZero/KnownOne bitsets.
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1859	void TargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1860	APInt &KnownZero,
Dan Gohman	fd29e0e	2008-02-13 00:35:47 +0000	[diff] [blame]	1861	APInt &KnownOne,
Dan Gohman	ea859be	2007-06-22 14:59:07 +0000	[diff] [blame]	1862	const SelectionDAG &DAG,
Nate Begeman	368e18d	2006-02-16 21:11:51 +0000	[diff] [blame]	1863	unsigned Depth) const {
Chris Lattner	1b5232a	2006-04-02 06:19:46 +0000	[diff] [blame]	1864	assert((Op.getOpcode() >= ISD::BUILTIN_OP_END \|\|
				1865	Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN \|\|
				1866	Op.getOpcode() == ISD::INTRINSIC_W_CHAIN \|\|
				1867	Op.getOpcode() == ISD::INTRINSIC_VOID) &&
Chris Lattner	c6fd6cd	2006-01-30 04:09:27 +0000	[diff] [blame]	1868	"Should use MaskedValueIsZero if you don't know whether Op"
				1869	" is a target node!");
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1870	KnownZero = KnownOne = APInt(KnownOne.getBitWidth(), 0);
Evan Cheng	3a03ebb	2005-12-21 23:05:39 +0000	[diff] [blame]	1871	}
Chris Lattner	4ccb070	2006-01-26 20:37:03 +0000	[diff] [blame]	1872
Chris Lattner	5c3e21d	2006-05-06 09:27:13 +0000	[diff] [blame]	1873	/// ComputeNumSignBitsForTargetNode - This method can be implemented by
				1874	/// targets that want to expose additional information about sign bits to the
				1875	/// DAG Combiner.
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1876	unsigned TargetLowering::ComputeNumSignBitsForTargetNode(SDValue Op,
Chris Lattner	5c3e21d	2006-05-06 09:27:13 +0000	[diff] [blame]	1877	unsigned Depth) const {
				1878	assert((Op.getOpcode() >= ISD::BUILTIN_OP_END \|\|
				1879	Op.getOpcode() == ISD::INTRINSIC_WO_CHAIN \|\|
				1880	Op.getOpcode() == ISD::INTRINSIC_W_CHAIN \|\|
				1881	Op.getOpcode() == ISD::INTRINSIC_VOID) &&
				1882	"Should use ComputeNumSignBits if you don't know whether Op"
				1883	" is a target node!");
				1884	return 1;
				1885	}
				1886
Dan Gohman	97d1163	2009-02-15 23:59:32 +0000	[diff] [blame]	1887	/// ValueHasExactlyOneBitSet - Test if the given value is known to have exactly
				1888	/// one bit set. This differs from ComputeMaskedBits in that it doesn't need to
				1889	/// determine which bit is set.
				1890	///
Dale Johannesen	85b0ede	2009-02-11 19:19:41 +0000	[diff] [blame]	1891	static bool ValueHasExactlyOneBitSet(SDValue Val, const SelectionDAG &DAG) {
Dan Gohman	97d1163	2009-02-15 23:59:32 +0000	[diff] [blame]	1892	// A left-shift of a constant one will have exactly one bit set, because
				1893	// shifting the bit off the end is undefined.
				1894	if (Val.getOpcode() == ISD::SHL)
				1895	if (ConstantSDNode *C =
				1896	dyn_cast<ConstantSDNode>(Val.getNode()->getOperand(0)))
				1897	if (C->getAPIntValue() == 1)
				1898	return true;
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	1899
Dan Gohman	97d1163	2009-02-15 23:59:32 +0000	[diff] [blame]	1900	// Similarly, a right-shift of a constant sign-bit will have exactly
				1901	// one bit set.
				1902	if (Val.getOpcode() == ISD::SRL)
				1903	if (ConstantSDNode *C =
				1904	dyn_cast<ConstantSDNode>(Val.getNode()->getOperand(0)))
				1905	if (C->getAPIntValue().isSignBit())
				1906	return true;
				1907
				1908	// More could be done here, though the above checks are enough
				1909	// to handle some common cases.
				1910
				1911	// Fall back to ComputeMaskedBits to catch other known cases.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1912	EVT OpVT = Val.getValueType();
Dan Gohman	5b870af	2010-03-02 02:14:38 +0000	[diff] [blame]	1913	unsigned BitWidth = OpVT.getScalarType().getSizeInBits();
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	1914	APInt KnownZero, KnownOne;
Rafael Espindola	26c8dcc	2012-04-04 12:51:34 +0000	[diff] [blame]	1915	DAG.ComputeMaskedBits(Val, KnownZero, KnownOne);
Dale Johannesen	85b0ede	2009-02-11 19:19:41 +0000	[diff] [blame]	1916	return (KnownZero.countPopulation() == BitWidth - 1) &&
				1917	(KnownOne.countPopulation() == 1);
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	1918	}
Chris Lattner	5c3e21d	2006-05-06 09:27:13 +0000	[diff] [blame]	1919
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	1920	/// SimplifySetCC - Try to simplify a setcc built with the specified operands
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	1921	/// and cc. If it is unable to simplify it, return a null SDValue.
				1922	SDValue
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	1923	TargetLowering::SimplifySetCC(EVT VT, SDValue N0, SDValue N1,
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	1924	ISD::CondCode Cond, bool foldBooleans,
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	1925	DAGCombinerInfo &DCI, DebugLoc dl) const {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	1926	SelectionDAG &DAG = DCI.DAG;
				1927
				1928	// These setcc operations always fold.
				1929	switch (Cond) {
				1930	default: break;
				1931	case ISD::SETFALSE:
				1932	case ISD::SETFALSE2: return DAG.getConstant(0, VT);
				1933	case ISD::SETTRUE:
				1934	case ISD::SETTRUE2: return DAG.getConstant(1, VT);
				1935	}
				1936
Chris Lattner	7a2bdde	2011-04-15 05:18:47 +0000	[diff] [blame]	1937	// Ensure that the constant occurs on the RHS, and fold constant
				1938	// comparisons.
				1939	if (isa<ConstantSDNode>(N0.getNode()))
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	1940	return DAG.getSetCC(dl, VT, N1, N0, ISD::getSetCCSwappedOperands(Cond));
Eric Christopher	362fee9	2011-06-17 20:41:29 +0000	[diff] [blame]	1941
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	1942	if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1.getNode())) {
Dan Gohman	6c6cd1c	2008-03-03 22:22:56 +0000	[diff] [blame]	1943	const APInt &C1 = N1C->getAPIntValue();
Dale Johannesen	89217a6	2008-11-07 01:28:02 +0000	[diff] [blame]	1944
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	1945	// If the LHS is '(srl (ctlz x), 5)', the RHS is 0/1, and this is an
				1946	// equality comparison, then we're just comparing whether X itself is
				1947	// zero.
				1948	if (N0.getOpcode() == ISD::SRL && (C1 == 0 \|\| C1 == 1) &&
				1949	N0.getOperand(0).getOpcode() == ISD::CTLZ &&
				1950	N0.getOperand(1).getOpcode() == ISD::Constant) {
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	1951	const APInt &ShAmt
				1952	= cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	1953	if ((Cond == ISD::SETEQ \|\| Cond == ISD::SETNE) &&
				1954	ShAmt == Log2_32(N0.getValueType().getSizeInBits())) {
				1955	if ((C1 == 0) == (Cond == ISD::SETEQ)) {
				1956	// (srl (ctlz x), 5) == 0 -> X != 0
				1957	// (srl (ctlz x), 5) != 1 -> X != 0
				1958	Cond = ISD::SETNE;
				1959	} else {
				1960	// (srl (ctlz x), 5) != 0 -> X == 0
				1961	// (srl (ctlz x), 5) == 1 -> X == 0
				1962	Cond = ISD::SETEQ;
				1963	}
				1964	SDValue Zero = DAG.getConstant(0, N0.getValueType());
				1965	return DAG.getSetCC(dl, VT, N0.getOperand(0).getOperand(0),
				1966	Zero, Cond);
				1967	}
				1968	}
				1969
Benjamin Kramer	d822892	2011-01-17 12:04:57 +0000	[diff] [blame]	1970	SDValue CTPOP = N0;
				1971	// Look through truncs that don't change the value of a ctpop.
				1972	if (N0.hasOneUse() && N0.getOpcode() == ISD::TRUNCATE)
				1973	CTPOP = N0.getOperand(0);
				1974
				1975	if (CTPOP.hasOneUse() && CTPOP.getOpcode() == ISD::CTPOP &&
Benjamin Kramer	c9b6a3e	2011-01-17 18:00:28 +0000	[diff] [blame]	1976	(N0 == CTPOP \|\| N0.getValueType().getSizeInBits() >
Benjamin Kramer	d822892	2011-01-17 12:04:57 +0000	[diff] [blame]	1977	Log2_32_Ceil(CTPOP.getValueType().getSizeInBits()))) {
				1978	EVT CTVT = CTPOP.getValueType();
				1979	SDValue CTOp = CTPOP.getOperand(0);
				1980
				1981	// (ctpop x) u< 2 -> (x & x-1) == 0
				1982	// (ctpop x) u> 1 -> (x & x-1) != 0
				1983	if ((Cond == ISD::SETULT && C1 == 2) \|\| (Cond == ISD::SETUGT && C1 == 1)){
				1984	SDValue Sub = DAG.getNode(ISD::SUB, dl, CTVT, CTOp,
				1985	DAG.getConstant(1, CTVT));
				1986	SDValue And = DAG.getNode(ISD::AND, dl, CTVT, CTOp, Sub);
				1987	ISD::CondCode CC = Cond == ISD::SETULT ? ISD::SETEQ : ISD::SETNE;
				1988	return DAG.getSetCC(dl, VT, And, DAG.getConstant(0, CTVT), CC);
				1989	}
				1990
				1991	// TODO: (ctpop x) == 1 -> x && (x & x-1) == 0 iff ctpop is illegal.
				1992	}
				1993
Benjamin Kramer	e7cf062	2011-04-22 18:47:44 +0000	[diff] [blame]	1994	// (zext x) == C --> x == (trunc C)
				1995	if (DCI.isBeforeLegalize() && N0->hasOneUse() &&
				1996	(Cond == ISD::SETEQ \|\| Cond == ISD::SETNE)) {
				1997	unsigned MinBits = N0.getValueSizeInBits();
				1998	SDValue PreZExt;
				1999	if (N0->getOpcode() == ISD::ZERO_EXTEND) {
				2000	// ZExt
				2001	MinBits = N0->getOperand(0).getValueSizeInBits();
				2002	PreZExt = N0->getOperand(0);
				2003	} else if (N0->getOpcode() == ISD::AND) {
				2004	// DAGCombine turns costly ZExts into ANDs
				2005	if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N0->getOperand(1)))
				2006	if ((C->getAPIntValue()+1).isPowerOf2()) {
				2007	MinBits = C->getAPIntValue().countTrailingOnes();
				2008	PreZExt = N0->getOperand(0);
				2009	}
				2010	} else if (LoadSDNode *LN0 = dyn_cast<LoadSDNode>(N0)) {
				2011	// ZEXTLOAD
				2012	if (LN0->getExtensionType() == ISD::ZEXTLOAD) {
				2013	MinBits = LN0->getMemoryVT().getSizeInBits();
				2014	PreZExt = N0;
				2015	}
				2016	}
				2017
				2018	// Make sure we're not loosing bits from the constant.
				2019	if (MinBits < C1.getBitWidth() && MinBits > C1.getActiveBits()) {
				2020	EVT MinVT = EVT::getIntegerVT(*DAG.getContext(), MinBits);
				2021	if (isTypeDesirableForOp(ISD::SETCC, MinVT)) {
				2022	// Will get folded away.
				2023	SDValue Trunc = DAG.getNode(ISD::TRUNCATE, dl, MinVT, PreZExt);
				2024	SDValue C = DAG.getConstant(C1.trunc(MinBits), MinVT);
				2025	return DAG.getSetCC(dl, VT, Trunc, C, Cond);
				2026	}
				2027	}
				2028	}
				2029
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2030	// If the LHS is '(and load, const)', the RHS is 0,
				2031	// the test is for equality or unsigned, and all 1 bits of the const are
				2032	// in the same partial word, see if we can shorten the load.
				2033	if (DCI.isBeforeLegalize() &&
				2034	N0.getOpcode() == ISD::AND && C1 == 0 &&
				2035	N0.getNode()->hasOneUse() &&
				2036	isa<LoadSDNode>(N0.getOperand(0)) &&
				2037	N0.getOperand(0).getNode()->hasOneUse() &&
				2038	isa<ConstantSDNode>(N0.getOperand(1))) {
				2039	LoadSDNode *Lod = cast<LoadSDNode>(N0.getOperand(0));
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2040	APInt bestMask;
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2041	unsigned bestWidth = 0, bestOffset = 0;
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2042	if (!Lod->isVolatile() && Lod->isUnindexed()) {
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2043	unsigned origWidth = N0.getValueType().getSizeInBits();
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2044	unsigned maskWidth = origWidth;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2045	// We can narrow (e.g.) 16-bit extending loads on 32-bit target to
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2046	// 8 bits, but have to be careful...
				2047	if (Lod->getExtensionType() != ISD::NON_EXTLOAD)
				2048	origWidth = Lod->getMemoryVT().getSizeInBits();
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2049	const APInt &Mask =
				2050	cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2051	for (unsigned width = origWidth / 2; width>=8; width /= 2) {
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2052	APInt newMask = APInt::getLowBitsSet(maskWidth, width);
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2053	for (unsigned offset=0; offset<origWidth/width; offset++) {
				2054	if ((newMask & Mask) == Mask) {
				2055	if (!TD->isLittleEndian())
				2056	bestOffset = (origWidth/width - offset - 1) * (width/8);
				2057	else
				2058	bestOffset = (uint64_t)offset * (width/8);
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2059	bestMask = Mask.lshr(offset * (width/8) * 8);
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2060	bestWidth = width;
				2061	break;
Dale Johannesen	89217a6	2008-11-07 01:28:02 +0000	[diff] [blame]	2062	}
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2063	newMask = newMask << width;
Dale Johannesen	89217a6	2008-11-07 01:28:02 +0000	[diff] [blame]	2064	}
				2065	}
				2066	}
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2067	if (bestWidth) {
Chris Lattner	c0c7fca	2011-04-14 04:12:47 +0000	[diff] [blame]	2068	EVT newVT = EVT::getIntegerVT(*DAG.getContext(), bestWidth);
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2069	if (newVT.isRound()) {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2070	EVT PtrType = Lod->getOperand(1).getValueType();
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2071	SDValue Ptr = Lod->getBasePtr();
				2072	if (bestOffset != 0)
				2073	Ptr = DAG.getNode(ISD::ADD, dl, PtrType, Lod->getBasePtr(),
				2074	DAG.getConstant(bestOffset, PtrType));
				2075	unsigned NewAlign = MinAlign(Lod->getAlignment(), bestOffset);
				2076	SDValue NewLoad = DAG.getLoad(newVT, dl, Lod->getChain(), Ptr,
Chris Lattner	ecf42c4	2010-09-21 16:36:31 +0000	[diff] [blame]	2077	Lod->getPointerInfo().getWithOffset(bestOffset),
Pete Cooper	d752e0f	2011-11-08 18:42:53 +0000	[diff] [blame]	2078	false, false, false, NewAlign);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2079	return DAG.getSetCC(dl, VT,
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2080	DAG.getNode(ISD::AND, dl, newVT, NewLoad,
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2081	DAG.getConstant(bestMask.trunc(bestWidth),
				2082	newVT)),
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2083	DAG.getConstant(0LL, newVT), Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2084	}
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2085	}
				2086	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2087
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2088	// If the LHS is a ZERO_EXTEND, perform the comparison on the input.
				2089	if (N0.getOpcode() == ISD::ZERO_EXTEND) {
				2090	unsigned InSize = N0.getOperand(0).getValueType().getSizeInBits();
				2091
				2092	// If the comparison constant has bits in the upper part, the
				2093	// zero-extended value could never match.
				2094	if (C1.intersects(APInt::getHighBitsSet(C1.getBitWidth(),
				2095	C1.getBitWidth() - InSize))) {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2096	switch (Cond) {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2097	case ISD::SETUGT:
				2098	case ISD::SETUGE:
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2099	case ISD::SETEQ: return DAG.getConstant(0, VT);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2100	case ISD::SETULT:
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2101	case ISD::SETULE:
				2102	case ISD::SETNE: return DAG.getConstant(1, VT);
				2103	case ISD::SETGT:
				2104	case ISD::SETGE:
				2105	// True if the sign bit of C1 is set.
				2106	return DAG.getConstant(C1.isNegative(), VT);
				2107	case ISD::SETLT:
				2108	case ISD::SETLE:
				2109	// True if the sign bit of C1 isn't set.
				2110	return DAG.getConstant(C1.isNonNegative(), VT);
				2111	default:
Jakob Stoklund Olesen	78d1264	2009-07-24 18:22:59 +0000	[diff] [blame]	2112	break;
				2113	}
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2114	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2115
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2116	// Otherwise, we can perform the comparison with the low bits.
				2117	switch (Cond) {
				2118	case ISD::SETEQ:
				2119	case ISD::SETNE:
				2120	case ISD::SETUGT:
				2121	case ISD::SETUGE:
				2122	case ISD::SETULT:
				2123	case ISD::SETULE: {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2124	EVT newVT = N0.getOperand(0).getValueType();
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2125	if (DCI.isBeforeLegalizeOps() \|\|
				2126	(isOperationLegal(ISD::SETCC, newVT) &&
				2127	getCondCodeAction(Cond, newVT)==Legal))
				2128	return DAG.getSetCC(dl, VT, N0.getOperand(0),
Jay Foad	40f8f62	2010-12-07 08:25:19 +0000	[diff] [blame]	2129	DAG.getConstant(C1.trunc(InSize), newVT),
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2130	Cond);
				2131	break;
				2132	}
				2133	default:
				2134	break; // todo, be more careful with signed comparisons
				2135	}
				2136	} else if (N0.getOpcode() == ISD::SIGN_EXTEND_INREG &&
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2137	(Cond == ISD::SETEQ \|\| Cond == ISD::SETNE)) {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2138	EVT ExtSrcTy = cast<VTSDNode>(N0.getOperand(1))->getVT();
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2139	unsigned ExtSrcTyBits = ExtSrcTy.getSizeInBits();
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2140	EVT ExtDstTy = N0.getValueType();
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2141	unsigned ExtDstTyBits = ExtDstTy.getSizeInBits();
				2142
Eli Friedman	ad78a88	2010-07-30 06:44:31 +0000	[diff] [blame]	2143	// If the constant doesn't fit into the number of bits for the source of
				2144	// the sign extension, it is impossible for both sides to be equal.
				2145	if (C1.getMinSignedBits() > ExtSrcTyBits)
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2146	return DAG.getConstant(Cond == ISD::SETNE, VT);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2147
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2148	SDValue ZextOp;
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2149	EVT Op0Ty = N0.getOperand(0).getValueType();
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2150	if (Op0Ty == ExtSrcTy) {
				2151	ZextOp = N0.getOperand(0);
				2152	} else {
				2153	APInt Imm = APInt::getLowBitsSet(ExtDstTyBits, ExtSrcTyBits);
				2154	ZextOp = DAG.getNode(ISD::AND, dl, Op0Ty, N0.getOperand(0),
				2155	DAG.getConstant(Imm, Op0Ty));
				2156	}
				2157	if (!DCI.isCalledByLegalizer())
				2158	DCI.AddToWorklist(ZextOp.getNode());
				2159	// Otherwise, make this a use of a zext.
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2160	return DAG.getSetCC(dl, VT, ZextOp,
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2161	DAG.getConstant(C1 & APInt::getLowBitsSet(
				2162	ExtDstTyBits,
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2163	ExtSrcTyBits),
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2164	ExtDstTy),
				2165	Cond);
				2166	} else if ((N1C->isNullValue() \|\| N1C->getAPIntValue() == 1) &&
				2167	(Cond == ISD::SETEQ \|\| Cond == ISD::SETNE)) {
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2168	// SETCC (SETCC), [0\|1], [EQ\|NE] -> SETCC
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2169	if (N0.getOpcode() == ISD::SETCC &&
				2170	isTypeLegal(VT) && VT.bitsLE(N0.getValueType())) {
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2171	bool TrueWhenTrue = (Cond == ISD::SETEQ) ^ (N1C->getAPIntValue() != 1);
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2172	if (TrueWhenTrue)
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2173	return DAG.getNode(ISD::TRUNCATE, dl, VT, N0);
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2174	// Invert the condition.
				2175	ISD::CondCode CC = cast<CondCodeSDNode>(N0.getOperand(2))->get();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2176	CC = ISD::getSetCCInverse(CC,
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2177	N0.getOperand(0).getValueType().isInteger());
				2178	return DAG.getSetCC(dl, VT, N0.getOperand(0), N0.getOperand(1), CC);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2179	}
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2180
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2181	if ((N0.getOpcode() == ISD::XOR \|\|
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2182	(N0.getOpcode() == ISD::AND &&
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2183	N0.getOperand(0).getOpcode() == ISD::XOR &&
				2184	N0.getOperand(1) == N0.getOperand(0).getOperand(1))) &&
				2185	isa<ConstantSDNode>(N0.getOperand(1)) &&
				2186	cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue() == 1) {
				2187	// If this is (X^1) == 0/1, swap the RHS and eliminate the xor. We
				2188	// can only do this if the top bits are known zero.
				2189	unsigned BitWidth = N0.getValueSizeInBits();
				2190	if (DAG.MaskedValueIsZero(N0,
				2191	APInt::getHighBitsSet(BitWidth,
				2192	BitWidth-1))) {
				2193	// Okay, get the un-inverted input value.
				2194	SDValue Val;
				2195	if (N0.getOpcode() == ISD::XOR)
				2196	Val = N0.getOperand(0);
				2197	else {
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2198	assert(N0.getOpcode() == ISD::AND &&
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2199	N0.getOperand(0).getOpcode() == ISD::XOR);
				2200	// ((X^1)&1)^1 -> X & 1
				2201	Val = DAG.getNode(ISD::AND, dl, N0.getValueType(),
				2202	N0.getOperand(0).getOperand(0),
				2203	N0.getOperand(1));
				2204	}
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2205
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2206	return DAG.getSetCC(dl, VT, Val, N1,
				2207	Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ);
				2208	}
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2209	} else if (N1C->getAPIntValue() == 1 &&
				2210	(VT == MVT::i1 \|\|
Duncan Sands	28b77e9	2011-09-06 19:07:46 +0000	[diff] [blame]	2211	getBooleanContents(false) == ZeroOrOneBooleanContent)) {
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2212	SDValue Op0 = N0;
				2213	if (Op0.getOpcode() == ISD::TRUNCATE)
				2214	Op0 = Op0.getOperand(0);
				2215
				2216	if ((Op0.getOpcode() == ISD::XOR) &&
				2217	Op0.getOperand(0).getOpcode() == ISD::SETCC &&
				2218	Op0.getOperand(1).getOpcode() == ISD::SETCC) {
				2219	// (xor (setcc), (setcc)) == / != 1 -> (setcc) != / == (setcc)
				2220	Cond = (Cond == ISD::SETEQ) ? ISD::SETNE : ISD::SETEQ;
				2221	return DAG.getSetCC(dl, VT, Op0.getOperand(0), Op0.getOperand(1),
				2222	Cond);
				2223	} else if (Op0.getOpcode() == ISD::AND &&
				2224	isa<ConstantSDNode>(Op0.getOperand(1)) &&
				2225	cast<ConstantSDNode>(Op0.getOperand(1))->getAPIntValue() == 1) {
				2226	// If this is (X&1) == / != 1, normalize it to (X&1) != / == 0.
Anton Korobeynikov	17458a7	2010-05-01 12:52:34 +0000	[diff] [blame]	2227	if (Op0.getValueType().bitsGT(VT))
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2228	Op0 = DAG.getNode(ISD::AND, dl, VT,
				2229	DAG.getNode(ISD::TRUNCATE, dl, VT, Op0.getOperand(0)),
				2230	DAG.getConstant(1, VT));
Anton Korobeynikov	17458a7	2010-05-01 12:52:34 +0000	[diff] [blame]	2231	else if (Op0.getValueType().bitsLT(VT))
				2232	Op0 = DAG.getNode(ISD::AND, dl, VT,
				2233	DAG.getNode(ISD::ANY_EXTEND, dl, VT, Op0.getOperand(0)),
				2234	DAG.getConstant(1, VT));
				2235
Evan Cheng	2c755ba	2010-02-27 07:36:59 +0000	[diff] [blame]	2236	return DAG.getSetCC(dl, VT, Op0,
				2237	DAG.getConstant(0, Op0.getValueType()),
				2238	Cond == ISD::SETEQ ? ISD::SETNE : ISD::SETEQ);
				2239	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2240	}
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2241	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2242
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2243	APInt MinVal, MaxVal;
				2244	unsigned OperandBitSize = N1C->getValueType(0).getSizeInBits();
				2245	if (ISD::isSignedIntSetCC(Cond)) {
				2246	MinVal = APInt::getSignedMinValue(OperandBitSize);
				2247	MaxVal = APInt::getSignedMaxValue(OperandBitSize);
				2248	} else {
				2249	MinVal = APInt::getMinValue(OperandBitSize);
				2250	MaxVal = APInt::getMaxValue(OperandBitSize);
				2251	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2252
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2253	// Canonicalize GE/LE comparisons to use GT/LT comparisons.
				2254	if (Cond == ISD::SETGE \|\| Cond == ISD::SETUGE) {
				2255	if (C1 == MinVal) return DAG.getConstant(1, VT); // X >= MIN --> true
				2256	// X >= C0 --> X > (C0-1)
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2257	return DAG.getSetCC(dl, VT, N0,
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2258	DAG.getConstant(C1-1, N1.getValueType()),
				2259	(Cond == ISD::SETGE) ? ISD::SETGT : ISD::SETUGT);
				2260	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2261
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2262	if (Cond == ISD::SETLE \|\| Cond == ISD::SETULE) {
				2263	if (C1 == MaxVal) return DAG.getConstant(1, VT); // X <= MAX --> true
				2264	// X <= C0 --> X < (C0+1)
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2265	return DAG.getSetCC(dl, VT, N0,
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2266	DAG.getConstant(C1+1, N1.getValueType()),
				2267	(Cond == ISD::SETLE) ? ISD::SETLT : ISD::SETULT);
				2268	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2269
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2270	if ((Cond == ISD::SETLT \|\| Cond == ISD::SETULT) && C1 == MinVal)
				2271	return DAG.getConstant(0, VT); // X < MIN --> false
				2272	if ((Cond == ISD::SETGE \|\| Cond == ISD::SETUGE) && C1 == MinVal)
				2273	return DAG.getConstant(1, VT); // X >= MIN --> true
				2274	if ((Cond == ISD::SETGT \|\| Cond == ISD::SETUGT) && C1 == MaxVal)
				2275	return DAG.getConstant(0, VT); // X > MAX --> false
				2276	if ((Cond == ISD::SETLE \|\| Cond == ISD::SETULE) && C1 == MaxVal)
				2277	return DAG.getConstant(1, VT); // X <= MAX --> true
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2278
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2279	// Canonicalize setgt X, Min --> setne X, Min
				2280	if ((Cond == ISD::SETGT \|\| Cond == ISD::SETUGT) && C1 == MinVal)
				2281	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETNE);
				2282	// Canonicalize setlt X, Max --> setne X, Max
				2283	if ((Cond == ISD::SETLT \|\| Cond == ISD::SETULT) && C1 == MaxVal)
				2284	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETNE);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2285
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2286	// If we have setult X, 1, turn it into seteq X, 0
				2287	if ((Cond == ISD::SETLT \|\| Cond == ISD::SETULT) && C1 == MinVal+1)
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2288	return DAG.getSetCC(dl, VT, N0,
				2289	DAG.getConstant(MinVal, N0.getValueType()),
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2290	ISD::SETEQ);
				2291	// If we have setugt X, Max-1, turn it into seteq X, Max
				2292	else if ((Cond == ISD::SETGT \|\| Cond == ISD::SETUGT) && C1 == MaxVal-1)
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2293	return DAG.getSetCC(dl, VT, N0,
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2294	DAG.getConstant(MaxVal, N0.getValueType()),
				2295	ISD::SETEQ);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2296
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2297	// If we have "setcc X, C0", check to see if we can shrink the immediate
				2298	// by changing cc.
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2299
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2300	// SETUGT X, SINTMAX -> SETLT X, 0
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2301	if (Cond == ISD::SETUGT &&
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2302	C1 == APInt::getSignedMaxValue(OperandBitSize))
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2303	return DAG.getSetCC(dl, VT, N0,
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2304	DAG.getConstant(0, N1.getValueType()),
				2305	ISD::SETLT);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2306
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2307	// SETULT X, SINTMIN -> SETGT X, -1
				2308	if (Cond == ISD::SETULT &&
				2309	C1 == APInt::getSignedMinValue(OperandBitSize)) {
				2310	SDValue ConstMinusOne =
				2311	DAG.getConstant(APInt::getAllOnesValue(OperandBitSize),
				2312	N1.getValueType());
				2313	return DAG.getSetCC(dl, VT, N0, ConstMinusOne, ISD::SETGT);
				2314	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2315
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2316	// Fold bit comparisons when we can.
				2317	if ((Cond == ISD::SETEQ \|\| Cond == ISD::SETNE) &&
Evan Cheng	d40d03e	2010-01-06 19:38:29 +0000	[diff] [blame]	2318	(VT == N0.getValueType() \|\|
				2319	(isTypeLegal(VT) && VT.bitsLE(N0.getValueType()))) &&
				2320	N0.getOpcode() == ISD::AND)
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2321	if (ConstantSDNode *AndRHS =
				2322	dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2323	EVT ShiftTy = DCI.isBeforeLegalize() ?
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	2324	getPointerTy() : getShiftAmountTy(N0.getValueType());
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2325	if (Cond == ISD::SETNE && C1 == 0) {// (X & 8) != 0 --> (X & 8) >> 3
				2326	// Perform the xform if the AND RHS is a single bit.
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2327	if (AndRHS->getAPIntValue().isPowerOf2()) {
Evan Cheng	d40d03e	2010-01-06 19:38:29 +0000	[diff] [blame]	2328	return DAG.getNode(ISD::TRUNCATE, dl, VT,
				2329	DAG.getNode(ISD::SRL, dl, N0.getValueType(), N0,
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2330	DAG.getConstant(AndRHS->getAPIntValue().logBase2(), ShiftTy)));
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2331	}
Evan Cheng	347a9cb	2010-01-07 20:58:44 +0000	[diff] [blame]	2332	} else if (Cond == ISD::SETEQ && C1 == AndRHS->getAPIntValue()) {
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2333	// (X & 8) == 8 --> (X & 8) >> 3
				2334	// Perform the xform if C1 is a single bit.
				2335	if (C1.isPowerOf2()) {
Evan Cheng	d40d03e	2010-01-06 19:38:29 +0000	[diff] [blame]	2336	return DAG.getNode(ISD::TRUNCATE, dl, VT,
				2337	DAG.getNode(ISD::SRL, dl, N0.getValueType(), N0,
				2338	DAG.getConstant(C1.logBase2(), ShiftTy)));
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2339	}
				2340	}
Eli Friedman	b101b0b	2009-07-26 23:47:17 +0000	[diff] [blame]	2341	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2342	}
				2343
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2344	if (isa<ConstantFPSDNode>(N0.getNode())) {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2345	// Constant fold or commute setcc.
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2346	SDValue O = DAG.FoldSetCC(VT, N0, N1, Cond, dl);
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2347	if (O.getNode()) return O;
				2348	} else if (ConstantFPSDNode *CFP = dyn_cast<ConstantFPSDNode>(N1.getNode())) {
Chris Lattner	63079f0	2007-12-29 08:37:08 +0000	[diff] [blame]	2349	// If the RHS of an FP comparison is a constant, simplify it away in
				2350	// some cases.
				2351	if (CFP->getValueAPF().isNaN()) {
				2352	// If an operand is known to be a nan, we can fold it.
				2353	switch (ISD::getUnorderedFlavor(Cond)) {
Torok Edwin	c23197a	2009-07-14 16:55:14 +0000	[diff] [blame]	2354	default: llvm_unreachable("Unknown flavor!");
Chris Lattner	63079f0	2007-12-29 08:37:08 +0000	[diff] [blame]	2355	case 0: // Known false.
				2356	return DAG.getConstant(0, VT);
				2357	case 1: // Known true.
				2358	return DAG.getConstant(1, VT);
Chris Lattner	1c3e1e2	2007-12-30 21:21:10 +0000	[diff] [blame]	2359	case 2: // Undefined.
Dale Johannesen	e8d7230	2009-02-06 23:05:02 +0000	[diff] [blame]	2360	return DAG.getUNDEF(VT);
Chris Lattner	63079f0	2007-12-29 08:37:08 +0000	[diff] [blame]	2361	}
				2362	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2363
Chris Lattner	63079f0	2007-12-29 08:37:08 +0000	[diff] [blame]	2364	// Otherwise, we know the RHS is not a NaN. Simplify the node to drop the
				2365	// constant if knowing that the operand is non-nan is enough. We prefer to
				2366	// have SETO(x,x) instead of SETO(x, 0.0) because this avoids having to
				2367	// materialize 0.0.
				2368	if (Cond == ISD::SETO \|\| Cond == ISD::SETUO)
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2369	return DAG.getSetCC(dl, VT, N0, N0, Cond);
Dan Gohman	11eab02	2009-09-26 15:24:17 +0000	[diff] [blame]	2370
				2371	// If the condition is not legal, see if we can find an equivalent one
				2372	// which is legal.
				2373	if (!isCondCodeLegal(Cond, N0.getValueType())) {
				2374	// If the comparison was an awkward floating-point == or != and one of
				2375	// the comparison operands is infinity or negative infinity, convert the
				2376	// condition to a less-awkward <= or >=.
				2377	if (CFP->getValueAPF().isInfinity()) {
				2378	if (CFP->getValueAPF().isNegative()) {
				2379	if (Cond == ISD::SETOEQ &&
				2380	isCondCodeLegal(ISD::SETOLE, N0.getValueType()))
				2381	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOLE);
				2382	if (Cond == ISD::SETUEQ &&
				2383	isCondCodeLegal(ISD::SETOLE, N0.getValueType()))
				2384	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETULE);
				2385	if (Cond == ISD::SETUNE &&
				2386	isCondCodeLegal(ISD::SETUGT, N0.getValueType()))
				2387	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETUGT);
				2388	if (Cond == ISD::SETONE &&
				2389	isCondCodeLegal(ISD::SETUGT, N0.getValueType()))
				2390	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOGT);
				2391	} else {
				2392	if (Cond == ISD::SETOEQ &&
				2393	isCondCodeLegal(ISD::SETOGE, N0.getValueType()))
				2394	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOGE);
				2395	if (Cond == ISD::SETUEQ &&
				2396	isCondCodeLegal(ISD::SETOGE, N0.getValueType()))
				2397	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETUGE);
				2398	if (Cond == ISD::SETUNE &&
				2399	isCondCodeLegal(ISD::SETULT, N0.getValueType()))
				2400	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETULT);
				2401	if (Cond == ISD::SETONE &&
				2402	isCondCodeLegal(ISD::SETULT, N0.getValueType()))
				2403	return DAG.getSetCC(dl, VT, N0, N1, ISD::SETOLT);
				2404	}
				2405	}
				2406	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2407	}
				2408
				2409	if (N0 == N1) {
				2410	// We can always fold X == X for integer setcc's.
Chad Rosier	9dbb018	2012-04-03 20:11:24 +0000	[diff] [blame]	2411	if (N0.getValueType().isInteger()) {
				2412	switch (getBooleanContents(N0.getValueType().isVector())) {
Chad Rosier	9dbb018	2012-04-03 20:11:24 +0000	[diff] [blame]	2413	case UndefinedBooleanContent:
				2414	case ZeroOrOneBooleanContent:
				2415	return DAG.getConstant(ISD::isTrueWhenEqual(Cond), VT);
				2416	case ZeroOrNegativeOneBooleanContent:
				2417	return DAG.getConstant(ISD::isTrueWhenEqual(Cond) ? -1 : 0, VT);
				2418	}
				2419	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2420	unsigned UOF = ISD::getUnorderedFlavor(Cond);
				2421	if (UOF == 2) // FP operators that are undefined on NaNs.
				2422	return DAG.getConstant(ISD::isTrueWhenEqual(Cond), VT);
				2423	if (UOF == unsigned(ISD::isTrueWhenEqual(Cond)))
				2424	return DAG.getConstant(UOF, VT);
				2425	// Otherwise, we can't fold it. However, we can simplify it to SETUO/SETO
				2426	// if it is not already.
				2427	ISD::CondCode NewCond = UOF == 0 ? ISD::SETO : ISD::SETUO;
				2428	if (NewCond != Cond)
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2429	return DAG.getSetCC(dl, VT, N0, N1, NewCond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2430	}
				2431
				2432	if ((Cond == ISD::SETEQ \|\| Cond == ISD::SETNE) &&
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	2433	N0.getValueType().isInteger()) {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2434	if (N0.getOpcode() == ISD::ADD \|\| N0.getOpcode() == ISD::SUB \|\|
				2435	N0.getOpcode() == ISD::XOR) {
				2436	// Simplify (X+Y) == (X+Z) --> Y == Z
				2437	if (N0.getOpcode() == N1.getOpcode()) {
				2438	if (N0.getOperand(0) == N1.getOperand(0))
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2439	return DAG.getSetCC(dl, VT, N0.getOperand(1), N1.getOperand(1), Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2440	if (N0.getOperand(1) == N1.getOperand(1))
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2441	return DAG.getSetCC(dl, VT, N0.getOperand(0), N1.getOperand(0), Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2442	if (DAG.isCommutativeBinOp(N0.getOpcode())) {
				2443	// If X op Y == Y op X, try other combinations.
				2444	if (N0.getOperand(0) == N1.getOperand(1))
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2445	return DAG.getSetCC(dl, VT, N0.getOperand(1), N1.getOperand(0),
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2446	Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2447	if (N0.getOperand(1) == N1.getOperand(0))
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2448	return DAG.getSetCC(dl, VT, N0.getOperand(0), N1.getOperand(1),
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2449	Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2450	}
				2451	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2452
Jakob Stoklund Olesen	740cd65	2012-04-05 20:30:20 +0000	[diff] [blame]	2453	// If RHS is a legal immediate value for a compare instruction, we need
				2454	// to be careful about increasing register pressure needlessly.
				2455	bool LegalRHSImm = false;
				2456
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2457	if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(N1)) {
				2458	if (ConstantSDNode *LHSR = dyn_cast<ConstantSDNode>(N0.getOperand(1))) {
				2459	// Turn (X+C1) == C2 --> X == C2-C1
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2460	if (N0.getOpcode() == ISD::ADD && N0.getNode()->hasOneUse()) {
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2461	return DAG.getSetCC(dl, VT, N0.getOperand(0),
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	2462	DAG.getConstant(RHSC->getAPIntValue()-
				2463	LHSR->getAPIntValue(),
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2464	N0.getValueType()), Cond);
				2465	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2466
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2467	// Turn (X^C1) == C2 into X == C1^C2 iff X&~C1 = 0.
				2468	if (N0.getOpcode() == ISD::XOR)
				2469	// If we know that all of the inverted bits are zero, don't bother
				2470	// performing the inversion.
Dan Gohman	2e68b6f	2008-02-25 21:11:39 +0000	[diff] [blame]	2471	if (DAG.MaskedValueIsZero(N0.getOperand(0), ~LHSR->getAPIntValue()))
				2472	return
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2473	DAG.getSetCC(dl, VT, N0.getOperand(0),
Dan Gohman	2e68b6f	2008-02-25 21:11:39 +0000	[diff] [blame]	2474	DAG.getConstant(LHSR->getAPIntValue() ^
				2475	RHSC->getAPIntValue(),
				2476	N0.getValueType()),
				2477	Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2478	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2479
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2480	// Turn (C1-X) == C2 --> X == C1-C2
				2481	if (ConstantSDNode *SUBC = dyn_cast<ConstantSDNode>(N0.getOperand(0))) {
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2482	if (N0.getOpcode() == ISD::SUB && N0.getNode()->hasOneUse()) {
Dan Gohman	2e68b6f	2008-02-25 21:11:39 +0000	[diff] [blame]	2483	return
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2484	DAG.getSetCC(dl, VT, N0.getOperand(1),
Dan Gohman	2e68b6f	2008-02-25 21:11:39 +0000	[diff] [blame]	2485	DAG.getConstant(SUBC->getAPIntValue() -
				2486	RHSC->getAPIntValue(),
				2487	N0.getValueType()),
				2488	Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2489	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2490	}
Jakob Stoklund Olesen	740cd65	2012-04-05 20:30:20 +0000	[diff] [blame]	2491
				2492	// Could RHSC fold directly into a compare?
				2493	if (RHSC->getValueType(0).getSizeInBits() <= 64)
				2494	LegalRHSImm = isLegalICmpImmediate(RHSC->getSExtValue());
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2495	}
				2496
				2497	// Simplify (X+Z) == X --> Z == 0
Jakob Stoklund Olesen	740cd65	2012-04-05 20:30:20 +0000	[diff] [blame]	2498	// Don't do this if X is an immediate that can fold into a cmp
				2499	// instruction and X+Z has other uses. It could be an induction variable
				2500	// chain, and the transform would increase register pressure.
				2501	if (!LegalRHSImm \|\| N0.getNode()->hasOneUse()) {
				2502	if (N0.getOperand(0) == N1)
				2503	return DAG.getSetCC(dl, VT, N0.getOperand(1),
				2504	DAG.getConstant(0, N0.getValueType()), Cond);
				2505	if (N0.getOperand(1) == N1) {
				2506	if (DAG.isCommutativeBinOp(N0.getOpcode()))
				2507	return DAG.getSetCC(dl, VT, N0.getOperand(0),
				2508	DAG.getConstant(0, N0.getValueType()), Cond);
				2509	else if (N0.getNode()->hasOneUse()) {
				2510	assert(N0.getOpcode() == ISD::SUB && "Unexpected operation!");
				2511	// (Z-X) == X --> Z == X<<1
				2512	SDValue SH = DAG.getNode(ISD::SHL, dl, N1.getValueType(), N1,
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	2513	DAG.getConstant(1, getShiftAmountTy(N1.getValueType())));
Jakob Stoklund Olesen	740cd65	2012-04-05 20:30:20 +0000	[diff] [blame]	2514	if (!DCI.isCalledByLegalizer())
				2515	DCI.AddToWorklist(SH.getNode());
				2516	return DAG.getSetCC(dl, VT, N0.getOperand(0), SH, Cond);
				2517	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2518	}
				2519	}
				2520	}
				2521
				2522	if (N1.getOpcode() == ISD::ADD \|\| N1.getOpcode() == ISD::SUB \|\|
				2523	N1.getOpcode() == ISD::XOR) {
				2524	// Simplify X == (X+Z) --> Z == 0
				2525	if (N1.getOperand(0) == N0) {
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2526	return DAG.getSetCC(dl, VT, N1.getOperand(1),
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2527	DAG.getConstant(0, N1.getValueType()), Cond);
				2528	} else if (N1.getOperand(1) == N0) {
				2529	if (DAG.isCommutativeBinOp(N1.getOpcode())) {
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2530	return DAG.getSetCC(dl, VT, N1.getOperand(0),
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2531	DAG.getConstant(0, N1.getValueType()), Cond);
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2532	} else if (N1.getNode()->hasOneUse()) {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2533	assert(N1.getOpcode() == ISD::SUB && "Unexpected operation!");
				2534	// X == (Z-X) --> X<<1 == Z
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2535	SDValue SH = DAG.getNode(ISD::SHL, dl, N1.getValueType(), N0,
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	2536	DAG.getConstant(1, getShiftAmountTy(N0.getValueType())));
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2537	if (!DCI.isCalledByLegalizer())
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2538	DCI.AddToWorklist(SH.getNode());
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2539	return DAG.getSetCC(dl, VT, SH, N1.getOperand(0), Cond);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2540	}
				2541	}
				2542	}
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	2543
Dan Gohman	2c65c3d	2009-01-29 16:18:12 +0000	[diff] [blame]	2544	// Simplify x&y == y to x&y != 0 if y has exactly one bit set.
Dale Johannesen	85b0ede	2009-02-11 19:19:41 +0000	[diff] [blame]	2545	// Note that where y is variable and is known to have at most
				2546	// one bit set (for example, if it is z&1) we cannot do this;
				2547	// the expressions are not equivalent when y==0.
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	2548	if (N0.getOpcode() == ISD::AND)
				2549	if (N0.getOperand(0) == N1 \|\| N0.getOperand(1) == N1) {
Dale Johannesen	85b0ede	2009-02-11 19:19:41 +0000	[diff] [blame]	2550	if (ValueHasExactlyOneBitSet(N1, DAG)) {
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	2551	Cond = ISD::getSetCCInverse(Cond, /isInteger=/true);
				2552	SDValue Zero = DAG.getConstant(0, N1.getValueType());
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2553	return DAG.getSetCC(dl, VT, N0, Zero, Cond);
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	2554	}
				2555	}
				2556	if (N1.getOpcode() == ISD::AND)
				2557	if (N1.getOperand(0) == N0 \|\| N1.getOperand(1) == N0) {
Dale Johannesen	85b0ede	2009-02-11 19:19:41 +0000	[diff] [blame]	2558	if (ValueHasExactlyOneBitSet(N0, DAG)) {
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	2559	Cond = ISD::getSetCCInverse(Cond, /isInteger=/true);
				2560	SDValue Zero = DAG.getConstant(0, N0.getValueType());
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2561	return DAG.getSetCC(dl, VT, N1, Zero, Cond);
Dan Gohman	e5af2d3	2009-01-29 01:59:02 +0000	[diff] [blame]	2562	}
				2563	}
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2564	}
				2565
				2566	// Fold away ALL boolean setcc's.
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	2567	SDValue Temp;
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2568	if (N0.getValueType() == MVT::i1 && foldBooleans) {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2569	switch (Cond) {
Torok Edwin	c23197a	2009-07-14 16:55:14 +0000	[diff] [blame]	2570	default: llvm_unreachable("Unknown integer setcc!");
Bob Wilson	4c24546	2009-01-22 17:39:32 +0000	[diff] [blame]	2571	case ISD::SETEQ: // X == Y -> ~(X^Y)
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2572	Temp = DAG.getNode(ISD::XOR, dl, MVT::i1, N0, N1);
				2573	N0 = DAG.getNOT(dl, Temp, MVT::i1);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2574	if (!DCI.isCalledByLegalizer())
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2575	DCI.AddToWorklist(Temp.getNode());
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2576	break;
				2577	case ISD::SETNE: // X != Y --> (X^Y)
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2578	N0 = DAG.getNode(ISD::XOR, dl, MVT::i1, N0, N1);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2579	break;
Bob Wilson	4c24546	2009-01-22 17:39:32 +0000	[diff] [blame]	2580	case ISD::SETGT: // X >s Y --> X == 0 & Y == 1 --> ~X & Y
				2581	case ISD::SETULT: // X <u Y --> X == 0 & Y == 1 --> ~X & Y
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2582	Temp = DAG.getNOT(dl, N0, MVT::i1);
				2583	N0 = DAG.getNode(ISD::AND, dl, MVT::i1, N1, Temp);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2584	if (!DCI.isCalledByLegalizer())
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2585	DCI.AddToWorklist(Temp.getNode());
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2586	break;
Bob Wilson	4c24546	2009-01-22 17:39:32 +0000	[diff] [blame]	2587	case ISD::SETLT: // X <s Y --> X == 1 & Y == 0 --> ~Y & X
				2588	case ISD::SETUGT: // X >u Y --> X == 1 & Y == 0 --> ~Y & X
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2589	Temp = DAG.getNOT(dl, N1, MVT::i1);
				2590	N0 = DAG.getNode(ISD::AND, dl, MVT::i1, N0, Temp);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2591	if (!DCI.isCalledByLegalizer())
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2592	DCI.AddToWorklist(Temp.getNode());
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2593	break;
Bob Wilson	4c24546	2009-01-22 17:39:32 +0000	[diff] [blame]	2594	case ISD::SETULE: // X <=u Y --> X == 0 \| Y == 1 --> ~X \| Y
				2595	case ISD::SETGE: // X >=s Y --> X == 0 \| Y == 1 --> ~X \| Y
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2596	Temp = DAG.getNOT(dl, N0, MVT::i1);
				2597	N0 = DAG.getNode(ISD::OR, dl, MVT::i1, N1, Temp);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2598	if (!DCI.isCalledByLegalizer())
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2599	DCI.AddToWorklist(Temp.getNode());
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2600	break;
Bob Wilson	4c24546	2009-01-22 17:39:32 +0000	[diff] [blame]	2601	case ISD::SETUGE: // X >=u Y --> X == 1 \| Y == 0 --> ~Y \| X
				2602	case ISD::SETLE: // X <=s Y --> X == 1 \| Y == 0 --> ~Y \| X
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2603	Temp = DAG.getNOT(dl, N1, MVT::i1);
				2604	N0 = DAG.getNode(ISD::OR, dl, MVT::i1, N0, Temp);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2605	break;
				2606	}
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2607	if (VT != MVT::i1) {
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2608	if (!DCI.isCalledByLegalizer())
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2609	DCI.AddToWorklist(N0.getNode());
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2610	// FIXME: If running after legalize, we probably can't do this.
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	2611	N0 = DAG.getNode(ISD::ZERO_EXTEND, dl, VT, N0);
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2612	}
				2613	return N0;
				2614	}
				2615
				2616	// Could not fold it.
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	2617	return SDValue();
Evan Cheng	fa1eb27	2007-02-08 22:13:59 +0000	[diff] [blame]	2618	}
				2619
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2620	/// isGAPlusOffset - Returns true (and the GlobalValue and the offset) if the
				2621	/// node is a GlobalAddress + offset.
Chris Lattner	0a9481f	2011-02-13 22:25:43 +0000	[diff] [blame]	2622	bool TargetLowering::isGAPlusOffset(SDNode N, const GlobalValue &GA,
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2623	int64_t &Offset) const {
				2624	if (isa<GlobalAddressSDNode>(N)) {
Dan Gohman	9ea3f56	2008-06-09 22:05:52 +0000	[diff] [blame]	2625	GlobalAddressSDNode *GASD = cast<GlobalAddressSDNode>(N);
				2626	GA = GASD->getGlobal();
				2627	Offset += GASD->getOffset();
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2628	return true;
				2629	}
				2630
				2631	if (N->getOpcode() == ISD::ADD) {
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	2632	SDValue N1 = N->getOperand(0);
				2633	SDValue N2 = N->getOperand(1);
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2634	if (isGAPlusOffset(N1.getNode(), GA, Offset)) {
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2635	ConstantSDNode *V = dyn_cast<ConstantSDNode>(N2);
				2636	if (V) {
Dan Gohman	7810bfe	2008-09-26 21:54:37 +0000	[diff] [blame]	2637	Offset += V->getSExtValue();
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2638	return true;
				2639	}
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	2640	} else if (isGAPlusOffset(N2.getNode(), GA, Offset)) {
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2641	ConstantSDNode *V = dyn_cast<ConstantSDNode>(N1);
				2642	if (V) {
Dan Gohman	7810bfe	2008-09-26 21:54:37 +0000	[diff] [blame]	2643	Offset += V->getSExtValue();
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2644	return true;
				2645	}
				2646	}
				2647	}
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	2648
Evan Cheng	ad4196b	2008-05-12 19:56:52 +0000	[diff] [blame]	2649	return false;
				2650	}
				2651
				2652
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	2653	SDValue TargetLowering::
Chris Lattner	00ffed0	2006-03-01 04:52:55 +0000	[diff] [blame]	2654	PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const {
				2655	// Default implementation: no optimization.
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	2656	return SDValue();
Chris Lattner	00ffed0	2006-03-01 04:52:55 +0000	[diff] [blame]	2657	}
				2658
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2659	//===----------------------------------------------------------------------===//
				2660	// Inline Assembler Implementation Methods
				2661	//===----------------------------------------------------------------------===//
				2662
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	2663
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2664	TargetLowering::ConstraintType
Chris Lattner	4234f57	2007-03-25 02:14:49 +0000	[diff] [blame]	2665	TargetLowering::getConstraintType(const std::string &Constraint) const {
Chris Lattner	4234f57	2007-03-25 02:14:49 +0000	[diff] [blame]	2666	if (Constraint.size() == 1) {
				2667	switch (Constraint[0]) {
				2668	default: break;
				2669	case 'r': return C_RegisterClass;
				2670	case 'm': // memory
				2671	case 'o': // offsetable
				2672	case 'V': // not offsetable
				2673	return C_Memory;
				2674	case 'i': // Simple Integer or Relocatable Constant
				2675	case 'n': // Simple Integer
John Thompson	67aff16	2010-09-21 22:04:54 +0000	[diff] [blame]	2676	case 'E': // Floating Point Constant
				2677	case 'F': // Floating Point Constant
Chris Lattner	4234f57	2007-03-25 02:14:49 +0000	[diff] [blame]	2678	case 's': // Relocatable Constant
John Thompson	67aff16	2010-09-21 22:04:54 +0000	[diff] [blame]	2679	case 'p': // Address.
Chris Lattner	c13dd1c	2007-03-25 04:35:41 +0000	[diff] [blame]	2680	case 'X': // Allow ANY value.
Chris Lattner	4234f57	2007-03-25 02:14:49 +0000	[diff] [blame]	2681	case 'I': // Target registers.
				2682	case 'J':
				2683	case 'K':
				2684	case 'L':
				2685	case 'M':
				2686	case 'N':
				2687	case 'O':
				2688	case 'P':
John Thompson	67aff16	2010-09-21 22:04:54 +0000	[diff] [blame]	2689	case '<':
				2690	case '>':
Chris Lattner	4234f57	2007-03-25 02:14:49 +0000	[diff] [blame]	2691	return C_Other;
				2692	}
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2693	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2694
				2695	if (Constraint.size() > 1 && Constraint[0] == '{' &&
Chris Lattner	065421f	2007-03-25 02:18:14 +0000	[diff] [blame]	2696	Constraint[Constraint.size()-1] == '}')
				2697	return C_Register;
Chris Lattner	4234f57	2007-03-25 02:14:49 +0000	[diff] [blame]	2698	return C_Unknown;
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2699	}
				2700
Dale Johannesen	ba2a0b9	2008-01-29 02:21:21 +0000	[diff] [blame]	2701	/// LowerXConstraint - try to replace an X constraint, which matches anything,
				2702	/// with another that has more specific requirements based on the type of the
				2703	/// corresponding operand.
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2704	const char *TargetLowering::LowerXConstraint(EVT ConstraintVT) const{
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	2705	if (ConstraintVT.isInteger())
Chris Lattner	5e76423	2008-04-26 23:02:14 +0000	[diff] [blame]	2706	return "r";
Duncan Sands	83ec4b6	2008-06-06 12:08:01 +0000	[diff] [blame]	2707	if (ConstraintVT.isFloatingPoint())
Chris Lattner	5e76423	2008-04-26 23:02:14 +0000	[diff] [blame]	2708	return "f"; // works for many targets
				2709	return 0;
Dale Johannesen	ba2a0b9	2008-01-29 02:21:21 +0000	[diff] [blame]	2710	}
				2711
Chris Lattner	48884cd	2007-08-25 00:47:38 +0000	[diff] [blame]	2712	/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
				2713	/// vector. If it is invalid, don't add anything to Ops.
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	2714	void TargetLowering::LowerAsmOperandForConstraint(SDValue Op,
Eric Christopher	100c833	2011-06-02 23:16:42 +0000	[diff] [blame]	2715	std::string &Constraint,
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	2716	std::vector<SDValue> &Ops,
Chris Lattner	5e76423	2008-04-26 23:02:14 +0000	[diff] [blame]	2717	SelectionDAG &DAG) const {
Eric Christopher	362fee9	2011-06-17 20:41:29 +0000	[diff] [blame]	2718
Eric Christopher	100c833	2011-06-02 23:16:42 +0000	[diff] [blame]	2719	if (Constraint.length() > 1) return;
Eric Christopher	362fee9	2011-06-17 20:41:29 +0000	[diff] [blame]	2720
Eric Christopher	100c833	2011-06-02 23:16:42 +0000	[diff] [blame]	2721	char ConstraintLetter = Constraint[0];
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2722	switch (ConstraintLetter) {
Chris Lattner	9ff6ee8	2007-02-17 06:00:35 +0000	[diff] [blame]	2723	default: break;
Dale Johannesen	eb57ea7	2007-11-05 21:20:28 +0000	[diff] [blame]	2724	case 'X': // Allows any operand; labels (basic block) use this.
				2725	if (Op.getOpcode() == ISD::BasicBlock) {
				2726	Ops.push_back(Op);
				2727	return;
				2728	}
				2729	// fall through
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2730	case 'i': // Simple Integer or Relocatable Constant
				2731	case 'n': // Simple Integer
Dale Johannesen	eb57ea7	2007-11-05 21:20:28 +0000	[diff] [blame]	2732	case 's': { // Relocatable Constant
Chris Lattner	75c7d2b	2007-05-03 16:54:34 +0000	[diff] [blame]	2733	// These operands are interested in values of the form (GV+C), where C may
				2734	// be folded in as an offset of GV, or it may be explicitly added. Also, it
				2735	// is possible and fine if either GV or C are missing.
				2736	ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
				2737	GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(Op);
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2738
Chris Lattner	75c7d2b	2007-05-03 16:54:34 +0000	[diff] [blame]	2739	// If we have "(add GV, C)", pull out GV/C
				2740	if (Op.getOpcode() == ISD::ADD) {
				2741	C = dyn_cast<ConstantSDNode>(Op.getOperand(1));
				2742	GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(0));
				2743	if (C == 0 \|\| GA == 0) {
				2744	C = dyn_cast<ConstantSDNode>(Op.getOperand(0));
				2745	GA = dyn_cast<GlobalAddressSDNode>(Op.getOperand(1));
				2746	}
				2747	if (C == 0 \|\| GA == 0)
				2748	C = 0, GA = 0;
				2749	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2750
Chris Lattner	75c7d2b	2007-05-03 16:54:34 +0000	[diff] [blame]	2751	// If we find a valid operand, map to the TargetXXX version so that the
				2752	// value itself doesn't get selected.
				2753	if (GA) { // Either &GV or &GV+C
				2754	if (ConstraintLetter != 'n') {
				2755	int64_t Offs = GA->getOffset();
Dan Gohman	f5aeb1a	2008-09-12 16:56:44 +0000	[diff] [blame]	2756	if (C) Offs += C->getZExtValue();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2757	Ops.push_back(DAG.getTargetGlobalAddress(GA->getGlobal(),
Devang Patel	07538ad	2010-07-15 18:45:27 +0000	[diff] [blame]	2758	C ? C->getDebugLoc() : DebugLoc(),
Chris Lattner	48884cd	2007-08-25 00:47:38 +0000	[diff] [blame]	2759	Op.getValueType(), Offs));
				2760	return;
Chris Lattner	75c7d2b	2007-05-03 16:54:34 +0000	[diff] [blame]	2761	}
				2762	}
				2763	if (C) { // just C, no GV.
Chris Lattner	9ff6ee8	2007-02-17 06:00:35 +0000	[diff] [blame]	2764	// Simple constants are not allowed for 's'.
Chris Lattner	48884cd	2007-08-25 00:47:38 +0000	[diff] [blame]	2765	if (ConstraintLetter != 's') {
Dale Johannesen	78e3e52	2009-02-12 20:58:09 +0000	[diff] [blame]	2766	// gcc prints these as sign extended. Sign extend value to 64 bits
				2767	// now; without this it would get ZExt'd later in
				2768	// ScheduleDAGSDNodes::EmitNode, which is very generic.
				2769	Ops.push_back(DAG.getTargetConstant(C->getAPIntValue().getSExtValue(),
Owen Anderson	825b72b	2009-08-11 20:47:22 +0000	[diff] [blame]	2770	MVT::i64));
Chris Lattner	48884cd	2007-08-25 00:47:38 +0000	[diff] [blame]	2771	return;
				2772	}
Chris Lattner	9ff6ee8	2007-02-17 06:00:35 +0000	[diff] [blame]	2773	}
Chris Lattner	9ff6ee8	2007-02-17 06:00:35 +0000	[diff] [blame]	2774	break;
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2775	}
Chris Lattner	75c7d2b	2007-05-03 16:54:34 +0000	[diff] [blame]	2776	}
Chris Lattner	eb8146b	2006-02-04 02:13:02 +0000	[diff] [blame]	2777	}
				2778
Chris Lattner	1efa40f	2006-02-22 00:56:39 +0000	[diff] [blame]	2779	std::pair<unsigned, const TargetRegisterClass*> TargetLowering::
Chris Lattner	4217ca8dc	2006-02-21 23:11:00 +0000	[diff] [blame]	2780	getRegForInlineAsmConstraint(const std::string &Constraint,
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	2781	EVT VT) const {
Chris Lattner	1efa40f	2006-02-22 00:56:39 +0000	[diff] [blame]	2782	if (Constraint[0] != '{')
Douglas Gregor	7d9663c	2010-05-11 06:17:44 +0000	[diff] [blame]	2783	return std::make_pair(0u, static_cast<TargetRegisterClass*>(0));
Chris Lattner	a55079a	2006-02-01 01:29:47 +0000	[diff] [blame]	2784	assert(*(Constraint.end()-1) == '}' && "Not a brace enclosed constraint?");
				2785
				2786	// Remove the braces from around the name.
Benjamin Kramer	05872ea	2009-11-12 20:36:59 +0000	[diff] [blame]	2787	StringRef RegName(Constraint.data()+1, Constraint.size()-2);
Chris Lattner	1efa40f	2006-02-22 00:56:39 +0000	[diff] [blame]	2788
				2789	// Figure out which register class contains this reg.
Dan Gohman	6f0d024	2008-02-10 18:45:23 +0000	[diff] [blame]	2790	const TargetRegisterInfo *RI = TM.getRegisterInfo();
				2791	for (TargetRegisterInfo::regclass_iterator RCI = RI->regclass_begin(),
Chris Lattner	1efa40f	2006-02-22 00:56:39 +0000	[diff] [blame]	2792	E = RI->regclass_end(); RCI != E; ++RCI) {
				2793	const TargetRegisterClass RC = RCI;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2794
				2795	// If none of the value types for this register class are valid, we
Chris Lattner	b3befd4	2006-02-22 23:00:51 +0000	[diff] [blame]	2796	// can't use it. For example, 64-bit reg classes on 32-bit targets.
Jakob Stoklund Olesen	22e8a36	2011-10-12 01:24:51 +0000	[diff] [blame]	2797	if (!isLegalRC(RC))
				2798	continue;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2799
				2800	for (TargetRegisterClass::iterator I = RC->begin(), E = RC->end();
Chris Lattner	1efa40f	2006-02-22 00:56:39 +0000	[diff] [blame]	2801	I != E; ++I) {
Benjamin Kramer	05872ea	2009-11-12 20:36:59 +0000	[diff] [blame]	2802	if (RegName.equals_lower(RI->getName(*I)))
Chris Lattner	1efa40f	2006-02-22 00:56:39 +0000	[diff] [blame]	2803	return std::make_pair(*I, RC);
Chris Lattner	1efa40f	2006-02-22 00:56:39 +0000	[diff] [blame]	2804	}
Chris Lattner	4ccb070	2006-01-26 20:37:03 +0000	[diff] [blame]	2805	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2806
Douglas Gregor	7d9663c	2010-05-11 06:17:44 +0000	[diff] [blame]	2807	return std::make_pair(0u, static_cast<const TargetRegisterClass*>(0));
Chris Lattner	4ccb070	2006-01-26 20:37:03 +0000	[diff] [blame]	2808	}
Evan Cheng	30b37b5	2006-03-13 23:18:16 +0000	[diff] [blame]	2809
				2810	//===----------------------------------------------------------------------===//
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	2811	// Constraint Selection.
				2812
Chris Lattner	6bdcda3	2008-10-17 16:47:46 +0000	[diff] [blame]	2813	/// isMatchingInputConstraint - Return true of this is an input operand that is
				2814	/// a matching constraint like "4".
				2815	bool TargetLowering::AsmOperandInfo::isMatchingInputConstraint() const {
Chris Lattner	58f15c4	2008-10-17 16:21:11 +0000	[diff] [blame]	2816	assert(!ConstraintCode.empty() && "No known constraint!");
				2817	return isdigit(ConstraintCode[0]);
				2818	}
				2819
				2820	/// getMatchedOperand - If this is an input matching constraint, this method
				2821	/// returns the output operand it matches.
				2822	unsigned TargetLowering::AsmOperandInfo::getMatchedOperand() const {
				2823	assert(!ConstraintCode.empty() && "No known constraint!");
				2824	return atoi(ConstraintCode.c_str());
				2825	}
				2826
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2827
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2828	/// ParseConstraints - Split up the constraint string from the inline
				2829	/// assembly value into the specific constraints and their prefixes,
				2830	/// and also tie in the associated operand values.
				2831	/// If this returns an empty vector, and if the constraint string itself
				2832	/// isn't empty, there was an error parsing.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2833	TargetLowering::AsmOperandInfoVector TargetLowering::ParseConstraints(
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2834	ImmutableCallSite CS) const {
				2835	/// ConstraintOperands - Information about all of the constraints.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2836	AsmOperandInfoVector ConstraintOperands;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2837	const InlineAsm *IA = cast<InlineAsm>(CS.getCalledValue());
John Thompson	67aff16	2010-09-21 22:04:54 +0000	[diff] [blame]	2838	unsigned maCount = 0; // Largest number of multiple alternative constraints.
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2839
				2840	// Do a prepass over the constraints, canonicalizing them, and building up the
				2841	// ConstraintOperands list.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2842	InlineAsm::ConstraintInfoVector
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2843	ConstraintInfos = IA->ParseConstraints();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2844
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2845	unsigned ArgNo = 0; // ArgNo - The argument of the CallInst.
				2846	unsigned ResNo = 0; // ResNo - The result number of the next output.
				2847
				2848	for (unsigned i = 0, e = ConstraintInfos.size(); i != e; ++i) {
				2849	ConstraintOperands.push_back(AsmOperandInfo(ConstraintInfos[i]));
				2850	AsmOperandInfo &OpInfo = ConstraintOperands.back();
				2851
John Thompson	67aff16	2010-09-21 22:04:54 +0000	[diff] [blame]	2852	// Update multiple alternative constraint count.
				2853	if (OpInfo.multipleAlternatives.size() > maCount)
				2854	maCount = OpInfo.multipleAlternatives.size();
				2855
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2856	OpInfo.ConstraintVT = MVT::Other;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2857
				2858	// Compute the value type for each operand.
				2859	switch (OpInfo.Type) {
				2860	case InlineAsm::isOutput:
				2861	// Indirect outputs just consume an argument.
				2862	if (OpInfo.isIndirect) {
				2863	OpInfo.CallOperandVal = const_cast<Value *>(CS.getArgument(ArgNo++));
				2864	break;
				2865	}
				2866
				2867	// The return value of the call is this value. As such, there is no
				2868	// corresponding argument.
				2869	assert(!CS.getType()->isVoidTy() &&
				2870	"Bad inline asm!");
Chris Lattner	db125cf	2011-07-18 04:54:35 +0000	[diff] [blame]	2871	if (StructType *STy = dyn_cast<StructType>(CS.getType())) {
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2872	OpInfo.ConstraintVT = getValueType(STy->getElementType(ResNo));
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2873	} else {
				2874	assert(ResNo == 0 && "Asm only has one result!");
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2875	OpInfo.ConstraintVT = getValueType(CS.getType());
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2876	}
				2877	++ResNo;
				2878	break;
				2879	case InlineAsm::isInput:
				2880	OpInfo.CallOperandVal = const_cast<Value *>(CS.getArgument(ArgNo++));
				2881	break;
				2882	case InlineAsm::isClobber:
				2883	// Nothing to do.
				2884	break;
				2885	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2886
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2887	if (OpInfo.CallOperandVal) {
Chris Lattner	db125cf	2011-07-18 04:54:35 +0000	[diff] [blame]	2888	llvm::Type *OpTy = OpInfo.CallOperandVal->getType();
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2889	if (OpInfo.isIndirect) {
Chris Lattner	db125cf	2011-07-18 04:54:35 +0000	[diff] [blame]	2890	llvm::PointerType *PtrTy = dyn_cast<PointerType>(OpTy);
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2891	if (!PtrTy)
				2892	report_fatal_error("Indirect operand for inline asm not a pointer!");
				2893	OpTy = PtrTy->getElementType();
				2894	}
Eric Christopher	362fee9	2011-06-17 20:41:29 +0000	[diff] [blame]	2895
Eric Christopher	cef81b7	2011-05-09 20:04:43 +0000	[diff] [blame]	2896	// Look for vector wrapped in a struct. e.g. { <16 x i8> }.
Chris Lattner	db125cf	2011-07-18 04:54:35 +0000	[diff] [blame]	2897	if (StructType *STy = dyn_cast<StructType>(OpTy))
Eric Christopher	cef81b7	2011-05-09 20:04:43 +0000	[diff] [blame]	2898	if (STy->getNumElements() == 1)
				2899	OpTy = STy->getElementType(0);
				2900
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2901	// If OpTy is not a single value, it may be a struct/union that we
				2902	// can tile with integers.
				2903	if (!OpTy->isSingleValueType() && OpTy->isSized()) {
				2904	unsigned BitSize = TD->getTypeSizeInBits(OpTy);
				2905	switch (BitSize) {
				2906	default: break;
				2907	case 1:
				2908	case 8:
				2909	case 16:
				2910	case 32:
				2911	case 64:
				2912	case 128:
Dale Johannesen	71365d3	2010-11-09 01:15:07 +0000	[diff] [blame]	2913	OpInfo.ConstraintVT =
				2914	EVT::getEVT(IntegerType::get(OpTy->getContext(), BitSize), true);
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2915	break;
				2916	}
				2917	} else if (dyn_cast<PointerType>(OpTy)) {
				2918	OpInfo.ConstraintVT = MVT::getIntegerVT(8*TD->getPointerSize());
				2919	} else {
				2920	OpInfo.ConstraintVT = EVT::getEVT(OpTy, true);
				2921	}
				2922	}
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2923	}
				2924
				2925	// If we have multiple alternative constraints, select the best alternative.
				2926	if (ConstraintInfos.size()) {
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2927	if (maCount) {
				2928	unsigned bestMAIndex = 0;
				2929	int bestWeight = -1;
				2930	// weight: -1 = invalid match, and 0 = so-so match to 5 = good match.
				2931	int weight = -1;
				2932	unsigned maIndex;
				2933	// Compute the sums of the weights for each alternative, keeping track
				2934	// of the best (highest weight) one so far.
				2935	for (maIndex = 0; maIndex < maCount; ++maIndex) {
				2936	int weightSum = 0;
				2937	for (unsigned cIndex = 0, eIndex = ConstraintOperands.size();
				2938	cIndex != eIndex; ++cIndex) {
				2939	AsmOperandInfo& OpInfo = ConstraintOperands[cIndex];
				2940	if (OpInfo.Type == InlineAsm::isClobber)
				2941	continue;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2942
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2943	// If this is an output operand with a matching input operand,
				2944	// look up the matching input. If their types mismatch, e.g. one
				2945	// is an integer, the other is floating point, or their sizes are
				2946	// different, flag it as an maCantMatch.
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2947	if (OpInfo.hasMatchingInput()) {
				2948	AsmOperandInfo &Input = ConstraintOperands[OpInfo.MatchingInput];
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2949	if (OpInfo.ConstraintVT != Input.ConstraintVT) {
				2950	if ((OpInfo.ConstraintVT.isInteger() !=
				2951	Input.ConstraintVT.isInteger()) \|\|
				2952	(OpInfo.ConstraintVT.getSizeInBits() !=
				2953	Input.ConstraintVT.getSizeInBits())) {
				2954	weightSum = -1; // Can't match.
				2955	break;
				2956	}
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2957	}
				2958	}
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2959	weight = getMultipleConstraintMatchWeight(OpInfo, maIndex);
				2960	if (weight == -1) {
				2961	weightSum = -1;
				2962	break;
				2963	}
				2964	weightSum += weight;
				2965	}
				2966	// Update best.
				2967	if (weightSum > bestWeight) {
				2968	bestWeight = weightSum;
				2969	bestMAIndex = maIndex;
				2970	}
				2971	}
				2972
				2973	// Now select chosen alternative in each constraint.
				2974	for (unsigned cIndex = 0, eIndex = ConstraintOperands.size();
				2975	cIndex != eIndex; ++cIndex) {
				2976	AsmOperandInfo& cInfo = ConstraintOperands[cIndex];
				2977	if (cInfo.Type == InlineAsm::isClobber)
				2978	continue;
				2979	cInfo.selectAlternative(bestMAIndex);
				2980	}
				2981	}
				2982	}
				2983
				2984	// Check and hook up tied operands, choose constraint code to use.
				2985	for (unsigned cIndex = 0, eIndex = ConstraintOperands.size();
				2986	cIndex != eIndex; ++cIndex) {
				2987	AsmOperandInfo& OpInfo = ConstraintOperands[cIndex];
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	2988
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2989	// If this is an output operand with a matching input operand, look up the
				2990	// matching input. If their types mismatch, e.g. one is an integer, the
				2991	// other is floating point, or their sizes are different, flag it as an
				2992	// error.
				2993	if (OpInfo.hasMatchingInput()) {
				2994	AsmOperandInfo &Input = ConstraintOperands[OpInfo.MatchingInput];
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	2995
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	2996	if (OpInfo.ConstraintVT != Input.ConstraintVT) {
Eric Christopher	5427ede	2011-07-14 20:13:52 +0000	[diff] [blame]	2997	std::pair<unsigned, const TargetRegisterClass*> MatchRC =
				2998	getRegForInlineAsmConstraint(OpInfo.ConstraintCode, OpInfo.ConstraintVT);
				2999	std::pair<unsigned, const TargetRegisterClass*> InputRC =
				3000	getRegForInlineAsmConstraint(Input.ConstraintCode, Input.ConstraintVT);
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3001	if ((OpInfo.ConstraintVT.isInteger() !=
				3002	Input.ConstraintVT.isInteger()) \|\|
Eric Christopher	5427ede	2011-07-14 20:13:52 +0000	[diff] [blame]	3003	(MatchRC.second != InputRC.second)) {
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3004	report_fatal_error("Unsupported asm: input constraint"
				3005	" with a matching output constraint of"
				3006	" incompatible type!");
				3007	}
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3008	}
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3009
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3010	}
				3011	}
				3012
				3013	return ConstraintOperands;
				3014	}
				3015
Chris Lattner	58f15c4	2008-10-17 16:21:11 +0000	[diff] [blame]	3016
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3017	/// getConstraintGenerality - Return an integer indicating how general CT
				3018	/// is.
				3019	static unsigned getConstraintGenerality(TargetLowering::ConstraintType CT) {
				3020	switch (CT) {
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3021	case TargetLowering::C_Other:
				3022	case TargetLowering::C_Unknown:
				3023	return 0;
				3024	case TargetLowering::C_Register:
				3025	return 1;
				3026	case TargetLowering::C_RegisterClass:
				3027	return 2;
				3028	case TargetLowering::C_Memory:
				3029	return 3;
				3030	}
Chandler Carruth	732f05c	2012-01-10 18:08:01 +0000	[diff] [blame]	3031	llvm_unreachable("Invalid constraint type");
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3032	}
				3033
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3034	/// Examine constraint type and operand type and determine a weight value.
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3035	/// This object must already have been set up with the operand type
				3036	/// and the current alternative constraint selected.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3037	TargetLowering::ConstraintWeight
				3038	TargetLowering::getMultipleConstraintMatchWeight(
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3039	AsmOperandInfo &info, int maIndex) const {
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3040	InlineAsm::ConstraintCodeVector *rCodes;
John Thompson	67aff16	2010-09-21 22:04:54 +0000	[diff] [blame]	3041	if (maIndex >= (int)info.multipleAlternatives.size())
				3042	rCodes = &info.Codes;
				3043	else
				3044	rCodes = &info.multipleAlternatives[maIndex].Codes;
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3045	ConstraintWeight BestWeight = CW_Invalid;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3046
				3047	// Loop over the options, keeping track of the most general one.
John Thompson	67aff16	2010-09-21 22:04:54 +0000	[diff] [blame]	3048	for (unsigned i = 0, e = rCodes->size(); i != e; ++i) {
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3049	ConstraintWeight weight =
				3050	getSingleConstraintMatchWeight(info, (*rCodes)[i].c_str());
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3051	if (weight > BestWeight)
				3052	BestWeight = weight;
				3053	}
				3054
				3055	return BestWeight;
				3056	}
				3057
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3058	/// Examine constraint type and operand type and determine a weight value.
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3059	/// This object must already have been set up with the operand type
				3060	/// and the current alternative constraint selected.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3061	TargetLowering::ConstraintWeight
				3062	TargetLowering::getSingleConstraintMatchWeight(
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3063	AsmOperandInfo &info, const char *constraint) const {
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3064	ConstraintWeight weight = CW_Invalid;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3065	Value *CallOperandVal = info.CallOperandVal;
				3066	// If we don't have a value, we can't do a match,
				3067	// but allow it at the lowest weight.
				3068	if (CallOperandVal == NULL)
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3069	return CW_Default;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3070	// Look at the constraint type.
				3071	switch (*constraint) {
				3072	case 'i': // immediate integer.
				3073	case 'n': // immediate integer with a known value.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3074	if (isa<ConstantInt>(CallOperandVal))
				3075	weight = CW_Constant;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3076	break;
				3077	case 's': // non-explicit intregal immediate.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3078	if (isa<GlobalValue>(CallOperandVal))
				3079	weight = CW_Constant;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3080	break;
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3081	case 'E': // immediate float if host format.
				3082	case 'F': // immediate float.
				3083	if (isa<ConstantFP>(CallOperandVal))
				3084	weight = CW_Constant;
				3085	break;
				3086	case '<': // memory operand with autodecrement.
				3087	case '>': // memory operand with autoincrement.
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3088	case 'm': // memory operand.
				3089	case 'o': // offsettable memory operand
				3090	case 'V': // non-offsettable memory operand
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3091	weight = CW_Memory;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3092	break;
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3093	case 'r': // general register.
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3094	case 'g': // general register, memory operand or immediate integer.
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3095	// note: Clang converts "g" to "imr".
				3096	if (CallOperandVal->getType()->isIntegerTy())
				3097	weight = CW_Register;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3098	break;
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3099	case 'X': // any operand.
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3100	default:
John Thompson	44ab89e	2010-10-29 17:29:13 +0000	[diff] [blame]	3101	weight = CW_Default;
John Thompson	eac6e1d	2010-09-13 18:15:37 +0000	[diff] [blame]	3102	break;
				3103	}
				3104	return weight;
				3105	}
				3106
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3107	/// ChooseConstraint - If there are multiple different constraints that we
				3108	/// could pick for this operand (e.g. "imr") try to pick the 'best' one.
Chris Lattner	24e1a9d	2008-04-27 01:49:46 +0000	[diff] [blame]	3109	/// This is somewhat tricky: constraints fall into four classes:
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3110	/// Other -> immediates and magic values
				3111	/// Register -> one specific register
				3112	/// RegisterClass -> a group of regs
				3113	/// Memory -> memory
				3114	/// Ideally, we would pick the most specific constraint possible: if we have
				3115	/// something that fits into a register, we would pick it. The problem here
				3116	/// is that if we have something that could either be in a register or in
				3117	/// memory that use of the register could cause selection of other
				3118	/// operands to fail: they might only succeed if we pick memory. Because of
				3119	/// this the heuristic we use is:
				3120	///
				3121	/// 1) If there is an 'other' constraint, and if the operand is valid for
				3122	/// that constraint, use it. This makes us take advantage of 'i'
				3123	/// constraints when available.
				3124	/// 2) Otherwise, pick the most general constraint present. This prefers
				3125	/// 'm' over 'r', for example.
				3126	///
				3127	static void ChooseConstraint(TargetLowering::AsmOperandInfo &OpInfo,
Dale Johannesen	1784d16	2010-06-25 21:55:36 +0000	[diff] [blame]	3128	const TargetLowering &TLI,
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	3129	SDValue Op, SelectionDAG *DAG) {
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3130	assert(OpInfo.Codes.size() > 1 && "Doesn't have multiple constraint options");
				3131	unsigned BestIdx = 0;
				3132	TargetLowering::ConstraintType BestType = TargetLowering::C_Unknown;
				3133	int BestGenerality = -1;
Dale Johannesen	a5989f8	2010-06-28 22:09:45 +0000	[diff] [blame]	3134
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3135	// Loop over the options, keeping track of the most general one.
				3136	for (unsigned i = 0, e = OpInfo.Codes.size(); i != e; ++i) {
				3137	TargetLowering::ConstraintType CType =
				3138	TLI.getConstraintType(OpInfo.Codes[i]);
Dale Johannesen	a5989f8	2010-06-28 22:09:45 +0000	[diff] [blame]	3139
Chris Lattner	5a09690	2008-04-27 00:37:18 +0000	[diff] [blame]	3140	// If this is an 'other' constraint, see if the operand is valid for it.
				3141	// For example, on X86 we might have an 'rI' constraint. If the operand
				3142	// is an integer in the range [0..31] we want to use I (saving a load
				3143	// of a register), otherwise we must use 'r'.
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3144	if (CType == TargetLowering::C_Other && Op.getNode()) {
Chris Lattner	5a09690	2008-04-27 00:37:18 +0000	[diff] [blame]	3145	assert(OpInfo.Codes[i].size() == 1 &&
				3146	"Unhandled multi-letter 'other' constraint");
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	3147	std::vector<SDValue> ResultOps;
Eric Christopher	100c833	2011-06-02 23:16:42 +0000	[diff] [blame]	3148	TLI.LowerAsmOperandForConstraint(Op, OpInfo.Codes[i],
Chris Lattner	5a09690	2008-04-27 00:37:18 +0000	[diff] [blame]	3149	ResultOps, *DAG);
				3150	if (!ResultOps.empty()) {
				3151	BestType = CType;
				3152	BestIdx = i;
				3153	break;
				3154	}
				3155	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3156
Dale Johannesen	a5989f8	2010-06-28 22:09:45 +0000	[diff] [blame]	3157	// Things with matching constraints can only be registers, per gcc
				3158	// documentation. This mainly affects "g" constraints.
				3159	if (CType == TargetLowering::C_Memory && OpInfo.hasMatchingInput())
				3160	continue;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3161
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3162	// This constraint letter is more general than the previous one, use it.
				3163	int Generality = getConstraintGenerality(CType);
				3164	if (Generality > BestGenerality) {
				3165	BestType = CType;
				3166	BestIdx = i;
				3167	BestGenerality = Generality;
				3168	}
				3169	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3170
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3171	OpInfo.ConstraintCode = OpInfo.Codes[BestIdx];
				3172	OpInfo.ConstraintType = BestType;
				3173	}
				3174
				3175	/// ComputeConstraintToUse - Determines the constraint code and constraint
				3176	/// type to use for the specific AsmOperandInfo, setting
				3177	/// OpInfo.ConstraintCode and OpInfo.ConstraintType.
Chris Lattner	5a09690	2008-04-27 00:37:18 +0000	[diff] [blame]	3178	void TargetLowering::ComputeConstraintToUse(AsmOperandInfo &OpInfo,
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3179	SDValue Op,
Chris Lattner	5a09690	2008-04-27 00:37:18 +0000	[diff] [blame]	3180	SelectionDAG *DAG) const {
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3181	assert(!OpInfo.Codes.empty() && "Must have at least one constraint");
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3182
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3183	// Single-letter constraints ('r') are very common.
				3184	if (OpInfo.Codes.size() == 1) {
				3185	OpInfo.ConstraintCode = OpInfo.Codes[0];
				3186	OpInfo.ConstraintType = getConstraintType(OpInfo.ConstraintCode);
				3187	} else {
Dale Johannesen	1784d16	2010-06-25 21:55:36 +0000	[diff] [blame]	3188	ChooseConstraint(OpInfo, *this, Op, DAG);
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3189	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3190
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3191	// 'X' matches anything.
				3192	if (OpInfo.ConstraintCode == "X" && OpInfo.CallOperandVal) {
				3193	// Labels and constants are handled elsewhere ('X' is the only thing
Dale Johannesen	8ea5ec6	2009-07-07 23:26:33 +0000	[diff] [blame]	3194	// that matches labels). For Functions, the type here is the type of
Dale Johannesen	5339c55	2009-07-20 23:27:39 +0000	[diff] [blame]	3195	// the result, which is not what we want to look at; leave them alone.
				3196	Value *v = OpInfo.CallOperandVal;
Dale Johannesen	8ea5ec6	2009-07-07 23:26:33 +0000	[diff] [blame]	3197	if (isa<BasicBlock>(v) \|\| isa<ConstantInt>(v) \|\| isa<Function>(v)) {
				3198	OpInfo.CallOperandVal = v;
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3199	return;
Dale Johannesen	8ea5ec6	2009-07-07 23:26:33 +0000	[diff] [blame]	3200	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3201
Chris Lattner	4376fea	2008-04-27 00:09:47 +0000	[diff] [blame]	3202	// Otherwise, try to resolve it to something we know about by looking at
				3203	// the actual operand type.
				3204	if (const char *Repl = LowerXConstraint(OpInfo.ConstraintVT)) {
				3205	OpInfo.ConstraintCode = Repl;
				3206	OpInfo.ConstraintType = getConstraintType(OpInfo.ConstraintCode);
				3207	}
				3208	}
				3209	}
				3210
				3211	//===----------------------------------------------------------------------===//
Evan Cheng	30b37b5	2006-03-13 23:18:16 +0000	[diff] [blame]	3212	// Loop Strength Reduction hooks
				3213	//===----------------------------------------------------------------------===//
				3214
Chris Lattner	1436bb6	2007-03-30 23:14:50 +0000	[diff] [blame]	3215	/// isLegalAddressingMode - Return true if the addressing mode represented
				3216	/// by AM is legal for this target, for a load/store of the specified type.
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3217	bool TargetLowering::isLegalAddressingMode(const AddrMode &AM,
Chris Lattner	db125cf	2011-07-18 04:54:35 +0000	[diff] [blame]	3218	Type *Ty) const {
Chris Lattner	1436bb6	2007-03-30 23:14:50 +0000	[diff] [blame]	3219	// The default implementation of this implements a conservative RISCy, r+r and
				3220	// r+i addr mode.
				3221
				3222	// Allows a sign-extended 16-bit immediate field.
				3223	if (AM.BaseOffs <= -(1LL << 16) \|\| AM.BaseOffs >= (1LL << 16)-1)
				3224	return false;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3225
Chris Lattner	1436bb6	2007-03-30 23:14:50 +0000	[diff] [blame]	3226	// No global is ever allowed as a base.
				3227	if (AM.BaseGV)
				3228	return false;
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3229
				3230	// Only support r+r,
Chris Lattner	1436bb6	2007-03-30 23:14:50 +0000	[diff] [blame]	3231	switch (AM.Scale) {
				3232	case 0: // "r+i" or just "i", depending on HasBaseReg.
				3233	break;
				3234	case 1:
				3235	if (AM.HasBaseReg && AM.BaseOffs) // "r+r+i" is not allowed.
				3236	return false;
				3237	// Otherwise we have r+r or r+i.
				3238	break;
				3239	case 2:
				3240	if (AM.HasBaseReg \|\| AM.BaseOffs) // 2r+r or 2r+i is not allowed.
				3241	return false;
				3242	// Allow 2*r as r+r.
				3243	break;
				3244	}
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3245
Chris Lattner	1436bb6	2007-03-30 23:14:50 +0000	[diff] [blame]	3246	return true;
				3247	}
				3248
Benjamin Kramer	9c64030	2011-07-08 10:31:30 +0000	[diff] [blame]	3249	/// BuildExactDiv - Given an exact SDIV by a constant, create a multiplication
				3250	/// with the multiplicative inverse of the constant.
				3251	SDValue TargetLowering::BuildExactSDIV(SDValue Op1, SDValue Op2, DebugLoc dl,
				3252	SelectionDAG &DAG) const {
				3253	ConstantSDNode *C = cast<ConstantSDNode>(Op2);
				3254	APInt d = C->getAPIntValue();
				3255	assert(d != 0 && "Division by zero!");
				3256
				3257	// Shift the value upfront if it is even, so the LSB is one.
				3258	unsigned ShAmt = d.countTrailingZeros();
				3259	if (ShAmt) {
				3260	// TODO: For UDIV use SRL instead of SRA.
				3261	SDValue Amt = DAG.getConstant(ShAmt, getShiftAmountTy(Op1.getValueType()));
				3262	Op1 = DAG.getNode(ISD::SRA, dl, Op1.getValueType(), Op1, Amt);
				3263	d = d.ashr(ShAmt);
				3264	}
				3265
				3266	// Calculate the multiplicative inverse, using Newton's method.
				3267	APInt t, xn = d;
				3268	while ((t = d*xn) != 1)
				3269	xn *= APInt(d.getBitWidth(), 2) - t;
				3270
				3271	Op2 = DAG.getConstant(xn, Op1.getValueType());
				3272	return DAG.getNode(ISD::MUL, dl, Op1.getValueType(), Op1, Op2);
				3273	}
				3274
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3275	/// BuildSDIVSequence - Given an ISD::SDIV node expressing a divide by constant,
				3276	/// return a DAG expression to select that will generate the same value by
				3277	/// multiplying by a magic number. See:
				3278	/// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
Richard Osborne	19a4daf	2011-11-07 17:09:05 +0000	[diff] [blame]	3279	SDValue TargetLowering::
				3280	BuildSDIV(SDNode *N, SelectionDAG &DAG, bool IsAfterLegalization,
				3281	std::vector<SDNode> Created) const {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	3282	EVT VT = N->getValueType(0);
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3283	DebugLoc dl= N->getDebugLoc();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3284
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3285	// Check to see if we can do this.
Eli Friedman	fc69cb4	2008-11-30 06:35:39 +0000	[diff] [blame]	3286	// FIXME: We should be more aggressive here.
				3287	if (!isTypeLegal(VT))
				3288	return SDValue();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3289
Eli Friedman	fc69cb4	2008-11-30 06:35:39 +0000	[diff] [blame]	3290	APInt d = cast<ConstantSDNode>(N->getOperand(1))->getAPIntValue();
Jay Foad	4e5ea55	2009-04-30 10:15:35 +0000	[diff] [blame]	3291	APInt::ms magics = d.magic();
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3292
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3293	// Multiply the numerator (operand 0) by the magic value
Eli Friedman	fc69cb4	2008-11-30 06:35:39 +0000	[diff] [blame]	3294	// FIXME: We should support doing a MUL in a wider type
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	3295	SDValue Q;
Richard Osborne	19a4daf	2011-11-07 17:09:05 +0000	[diff] [blame]	3296	if (IsAfterLegalization ? isOperationLegal(ISD::MULHS, VT) :
				3297	isOperationLegalOrCustom(ISD::MULHS, VT))
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3298	Q = DAG.getNode(ISD::MULHS, dl, VT, N->getOperand(0),
Dan Gohman	525178c	2007-10-08 18:33:35 +0000	[diff] [blame]	3299	DAG.getConstant(magics.m, VT));
Richard Osborne	19a4daf	2011-11-07 17:09:05 +0000	[diff] [blame]	3300	else if (IsAfterLegalization ? isOperationLegal(ISD::SMUL_LOHI, VT) :
				3301	isOperationLegalOrCustom(ISD::SMUL_LOHI, VT))
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3302	Q = SDValue(DAG.getNode(ISD::SMUL_LOHI, dl, DAG.getVTList(VT, VT),
Dan Gohman	525178c	2007-10-08 18:33:35 +0000	[diff] [blame]	3303	N->getOperand(0),
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3304	DAG.getConstant(magics.m, VT)).getNode(), 1);
Dan Gohman	525178c	2007-10-08 18:33:35 +0000	[diff] [blame]	3305	else
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	3306	return SDValue(); // No mulhs or equvialent
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3307	// If d > 0 and m < 0, add the numerator
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3308	if (d.isStrictlyPositive() && magics.m.isNegative()) {
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3309	Q = DAG.getNode(ISD::ADD, dl, VT, Q, N->getOperand(0));
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3310	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3311	Created->push_back(Q.getNode());
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3312	}
				3313	// If d < 0 and m > 0, subtract the numerator.
Eli Friedman	fc69cb4	2008-11-30 06:35:39 +0000	[diff] [blame]	3314	if (d.isNegative() && magics.m.isStrictlyPositive()) {
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3315	Q = DAG.getNode(ISD::SUB, dl, VT, Q, N->getOperand(0));
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3316	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3317	Created->push_back(Q.getNode());
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3318	}
				3319	// Shift right algebraic if shift value is nonzero
				3320	if (magics.s > 0) {
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3321	Q = DAG.getNode(ISD::SRA, dl, VT, Q,
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	3322	DAG.getConstant(magics.s, getShiftAmountTy(Q.getValueType())));
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3323	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3324	Created->push_back(Q.getNode());
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3325	}
				3326	// Extract the sign bit and add it to the quotient
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	3327	SDValue T =
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3328	DAG.getNode(ISD::SRL, dl, VT, Q, DAG.getConstant(VT.getSizeInBits()-1,
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	3329	getShiftAmountTy(Q.getValueType())));
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3330	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3331	Created->push_back(T.getNode());
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3332	return DAG.getNode(ISD::ADD, dl, VT, Q, T);
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3333	}
				3334
				3335	/// BuildUDIVSequence - Given an ISD::UDIV node expressing a divide by constant,
				3336	/// return a DAG expression to select that will generate the same value by
				3337	/// multiplying by a magic number. See:
				3338	/// <http://the.wall.riscom.net/books/proc/ppc/cwg/code2.html>
Richard Osborne	19a4daf	2011-11-07 17:09:05 +0000	[diff] [blame]	3339	SDValue TargetLowering::
				3340	BuildUDIV(SDNode *N, SelectionDAG &DAG, bool IsAfterLegalization,
				3341	std::vector<SDNode> Created) const {
Owen Anderson	e50ed30	2009-08-10 22:56:29 +0000	[diff] [blame]	3342	EVT VT = N->getValueType(0);
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3343	DebugLoc dl = N->getDebugLoc();
Eli Friedman	201c977	2008-11-30 06:02:26 +0000	[diff] [blame]	3344
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3345	// Check to see if we can do this.
Eli Friedman	201c977	2008-11-30 06:02:26 +0000	[diff] [blame]	3346	// FIXME: We should be more aggressive here.
				3347	if (!isTypeLegal(VT))
				3348	return SDValue();
				3349
				3350	// FIXME: We should use a narrower constant when the upper
				3351	// bits are known to be zero.
Benjamin Kramer	1c10b8d	2011-03-17 20:39:14 +0000	[diff] [blame]	3352	const APInt &N1C = cast<ConstantSDNode>(N->getOperand(1))->getAPIntValue();
				3353	APInt::mu magics = N1C.magicu();
				3354
				3355	SDValue Q = N->getOperand(0);
				3356
				3357	// If the divisor is even, we can avoid using the expensive fixup by shifting
				3358	// the divided value upfront.
				3359	if (magics.a != 0 && !N1C[0]) {
				3360	unsigned Shift = N1C.countTrailingZeros();
				3361	Q = DAG.getNode(ISD::SRL, dl, VT, Q,
				3362	DAG.getConstant(Shift, getShiftAmountTy(Q.getValueType())));
				3363	if (Created)
				3364	Created->push_back(Q.getNode());
				3365
				3366	// Get magic number for the shifted divisor.
				3367	magics = N1C.lshr(Shift).magicu(Shift);
				3368	assert(magics.a == 0 && "Should use cheap fixup now");
				3369	}
Eli Friedman	201c977	2008-11-30 06:02:26 +0000	[diff] [blame]	3370
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3371	// Multiply the numerator (operand 0) by the magic value
Eli Friedman	201c977	2008-11-30 06:02:26 +0000	[diff] [blame]	3372	// FIXME: We should support doing a MUL in a wider type
Richard Osborne	19a4daf	2011-11-07 17:09:05 +0000	[diff] [blame]	3373	if (IsAfterLegalization ? isOperationLegal(ISD::MULHU, VT) :
				3374	isOperationLegalOrCustom(ISD::MULHU, VT))
Benjamin Kramer	1c10b8d	2011-03-17 20:39:14 +0000	[diff] [blame]	3375	Q = DAG.getNode(ISD::MULHU, dl, VT, Q, DAG.getConstant(magics.m, VT));
Richard Osborne	19a4daf	2011-11-07 17:09:05 +0000	[diff] [blame]	3376	else if (IsAfterLegalization ? isOperationLegal(ISD::UMUL_LOHI, VT) :
				3377	isOperationLegalOrCustom(ISD::UMUL_LOHI, VT))
Benjamin Kramer	1c10b8d	2011-03-17 20:39:14 +0000	[diff] [blame]	3378	Q = SDValue(DAG.getNode(ISD::UMUL_LOHI, dl, DAG.getVTList(VT, VT), Q,
				3379	DAG.getConstant(magics.m, VT)).getNode(), 1);
Dan Gohman	525178c	2007-10-08 18:33:35 +0000	[diff] [blame]	3380	else
Dan Gohman	475871a	2008-07-27 21:46:04 +0000	[diff] [blame]	3381	return SDValue(); // No mulhu or equvialent
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3382	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3383	Created->push_back(Q.getNode());
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3384
				3385	if (magics.a == 0) {
Benjamin Kramer	1c10b8d	2011-03-17 20:39:14 +0000	[diff] [blame]	3386	assert(magics.s < N1C.getBitWidth() &&
Eli Friedman	201c977	2008-11-30 06:02:26 +0000	[diff] [blame]	3387	"We shouldn't generate an undefined shift!");
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3388	return DAG.getNode(ISD::SRL, dl, VT, Q,
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	3389	DAG.getConstant(magics.s, getShiftAmountTy(Q.getValueType())));
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3390	} else {
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3391	SDValue NPQ = DAG.getNode(ISD::SUB, dl, VT, N->getOperand(0), Q);
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3392	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3393	Created->push_back(NPQ.getNode());
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3394	NPQ = DAG.getNode(ISD::SRL, dl, VT, NPQ,
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	3395	DAG.getConstant(1, getShiftAmountTy(NPQ.getValueType())));
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3396	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3397	Created->push_back(NPQ.getNode());
Dale Johannesen	ff97d4f	2009-02-03 00:47:48 +0000	[diff] [blame]	3398	NPQ = DAG.getNode(ISD::ADD, dl, VT, NPQ, Q);
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3399	if (Created)
Gabor Greif	ba36cb5	2008-08-28 21:40:38 +0000	[diff] [blame]	3400	Created->push_back(NPQ.getNode());
Wesley Peck	bf17cfa	2010-11-23 03:31:01 +0000	[diff] [blame]	3401	return DAG.getNode(ISD::SRL, dl, VT, NPQ,
Owen Anderson	95771af	2011-02-25 21:41:48 +0000	[diff] [blame]	3402	DAG.getConstant(magics.s-1, getShiftAmountTy(NPQ.getValueType())));
Andrew Lenharth	dae9cbe	2006-05-16 17:42:15 +0000	[diff] [blame]	3403	}
				3404	}