Misha Brukman | cf2b9ac | 2002-11-22 22:43:47 +0000 | [diff] [blame] | 1 | //===- X86RegisterInfo.cpp - X86 Register Information -----------*- C++ -*-===// |
Alkis Evlogimenos | 39354c9 | 2004-03-14 07:19:51 +0000 | [diff] [blame] | 2 | // |
John Criswell | b576c94 | 2003-10-20 19:43:21 +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. |
Alkis Evlogimenos | 39354c9 | 2004-03-14 07:19:51 +0000 | [diff] [blame] | 7 | // |
John Criswell | b576c94 | 2003-10-20 19:43:21 +0000 | [diff] [blame] | 8 | //===----------------------------------------------------------------------===// |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 9 | // |
Dan Gohman | 6f0d024 | 2008-02-10 18:45:23 +0000 | [diff] [blame] | 10 | // This file contains the X86 implementation of the TargetRegisterInfo class. |
| 11 | // This file is responsible for the frame pointer elimination optimization |
| 12 | // on X86. |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 13 | // |
| 14 | //===----------------------------------------------------------------------===// |
| 15 | |
Misha Brukman | b83b286 | 2002-11-20 18:59:43 +0000 | [diff] [blame] | 16 | #include "X86.h" |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 17 | #include "X86RegisterInfo.h" |
Misha Brukman | cf2b9ac | 2002-11-22 22:43:47 +0000 | [diff] [blame] | 18 | #include "X86InstrBuilder.h" |
Evan Cheng | e8bd0a3 | 2006-06-06 23:30:24 +0000 | [diff] [blame] | 19 | #include "X86MachineFunctionInfo.h" |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 20 | #include "X86Subtarget.h" |
Evan Cheng | e8bd0a3 | 2006-06-06 23:30:24 +0000 | [diff] [blame] | 21 | #include "X86TargetMachine.h" |
Misha Brukman | b83b286 | 2002-11-20 18:59:43 +0000 | [diff] [blame] | 22 | #include "llvm/Constants.h" |
Evan Cheng | 3649b0e | 2006-06-02 22:38:37 +0000 | [diff] [blame] | 23 | #include "llvm/Function.h" |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 24 | #include "llvm/Type.h" |
Chris Lattner | c8c377d | 2003-07-29 05:14:16 +0000 | [diff] [blame] | 25 | #include "llvm/CodeGen/ValueTypes.h" |
Misha Brukman | b83b286 | 2002-11-20 18:59:43 +0000 | [diff] [blame] | 26 | #include "llvm/CodeGen/MachineInstrBuilder.h" |
Chris Lattner | 198ab64 | 2002-12-15 20:06:35 +0000 | [diff] [blame] | 27 | #include "llvm/CodeGen/MachineFunction.h" |
Dan Gohman | 2dad025 | 2008-07-01 18:15:35 +0000 | [diff] [blame] | 28 | #include "llvm/CodeGen/MachineFunctionPass.h" |
Chris Lattner | aa09b75 | 2002-12-28 21:08:28 +0000 | [diff] [blame] | 29 | #include "llvm/CodeGen/MachineFrameInfo.h" |
Jim Laskey | f1d78e8 | 2006-03-23 18:12:57 +0000 | [diff] [blame] | 30 | #include "llvm/CodeGen/MachineLocation.h" |
Chris Lattner | 84bc542 | 2007-12-31 04:13:23 +0000 | [diff] [blame] | 31 | #include "llvm/CodeGen/MachineModuleInfo.h" |
| 32 | #include "llvm/CodeGen/MachineRegisterInfo.h" |
Anton Korobeynikov | ce3b465 | 2007-05-02 19:53:33 +0000 | [diff] [blame] | 33 | #include "llvm/Target/TargetAsmInfo.h" |
Chris Lattner | f158da2 | 2003-01-16 02:20:12 +0000 | [diff] [blame] | 34 | #include "llvm/Target/TargetFrameInfo.h" |
Evan Cheng | 51cdcd1 | 2006-12-07 01:21:59 +0000 | [diff] [blame] | 35 | #include "llvm/Target/TargetInstrInfo.h" |
Misha Brukman | 83eaa0b | 2004-06-21 21:10:24 +0000 | [diff] [blame] | 36 | #include "llvm/Target/TargetMachine.h" |
Chris Lattner | 0cf0c37 | 2004-07-11 04:17:10 +0000 | [diff] [blame] | 37 | #include "llvm/Target/TargetOptions.h" |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 38 | #include "llvm/ADT/BitVector.h" |
Reid Spencer | 551ccae | 2004-09-01 22:55:40 +0000 | [diff] [blame] | 39 | #include "llvm/ADT/STLExtras.h" |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 40 | #include "llvm/Support/CommandLine.h" |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 41 | #include "llvm/Support/Compiler.h" |
Torok Edwin | c25e758 | 2009-07-11 20:10:48 +0000 | [diff] [blame] | 42 | #include "llvm/Support/ErrorHandling.h" |
Chris Lattner | 300d0ed | 2004-02-14 06:00:36 +0000 | [diff] [blame] | 43 | using namespace llvm; |
Brian Gaeke | d0fde30 | 2003-11-11 22:41:34 +0000 | [diff] [blame] | 44 | |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 45 | X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm, |
| 46 | const TargetInstrInfo &tii) |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 47 | : X86GenRegisterInfo(tm.getSubtarget<X86Subtarget>().is64Bit() ? |
| 48 | X86::ADJCALLSTACKDOWN64 : |
| 49 | X86::ADJCALLSTACKDOWN32, |
| 50 | tm.getSubtarget<X86Subtarget>().is64Bit() ? |
| 51 | X86::ADJCALLSTACKUP64 : |
| 52 | X86::ADJCALLSTACKUP32), |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 53 | TM(tm), TII(tii) { |
| 54 | // Cache some information. |
| 55 | const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>(); |
| 56 | Is64Bit = Subtarget->is64Bit(); |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 57 | IsWin64 = Subtarget->isTargetWin64(); |
Evan Cheng | db807ed | 2007-11-05 07:30:01 +0000 | [diff] [blame] | 58 | StackAlign = TM.getFrameInfo()->getStackAlignment(); |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 59 | if (Is64Bit) { |
| 60 | SlotSize = 8; |
| 61 | StackPtr = X86::RSP; |
| 62 | FramePtr = X86::RBP; |
| 63 | } else { |
| 64 | SlotSize = 4; |
| 65 | StackPtr = X86::ESP; |
| 66 | FramePtr = X86::EBP; |
| 67 | } |
| 68 | } |
Chris Lattner | 7ad3e06 | 2003-08-03 15:48:14 +0000 | [diff] [blame] | 69 | |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 70 | // getDwarfRegNum - This function maps LLVM register identifiers to the |
| 71 | // Dwarf specific numbering, used in debug info and exception tables. |
Dale Johannesen | 4542edc | 2007-11-07 21:48:35 +0000 | [diff] [blame] | 72 | |
Dale Johannesen | b97aec6 | 2007-11-13 19:13:01 +0000 | [diff] [blame] | 73 | int X86RegisterInfo::getDwarfRegNum(unsigned RegNo, bool isEH) const { |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 74 | const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>(); |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 75 | unsigned Flavour = DWARFFlavour::X86_64; |
Dale Johannesen | 7a42f24 | 2007-11-09 18:07:11 +0000 | [diff] [blame] | 76 | if (!Subtarget->is64Bit()) { |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 77 | if (Subtarget->isTargetDarwin()) { |
Anton Korobeynikov | 8eea339 | 2008-01-25 00:34:13 +0000 | [diff] [blame] | 78 | if (isEH) |
| 79 | Flavour = DWARFFlavour::X86_32_DarwinEH; |
| 80 | else |
| 81 | Flavour = DWARFFlavour::X86_32_Generic; |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 82 | } else if (Subtarget->isTargetCygMing()) { |
| 83 | // Unsupported by now, just quick fallback |
Anton Korobeynikov | 8eea339 | 2008-01-25 00:34:13 +0000 | [diff] [blame] | 84 | Flavour = DWARFFlavour::X86_32_Generic; |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 85 | } else { |
Anton Korobeynikov | 8eea339 | 2008-01-25 00:34:13 +0000 | [diff] [blame] | 86 | Flavour = DWARFFlavour::X86_32_Generic; |
Dale Johannesen | 7a42f24 | 2007-11-09 18:07:11 +0000 | [diff] [blame] | 87 | } |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 88 | } |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 89 | |
| 90 | return X86GenRegisterInfo::getDwarfRegNumFull(RegNo, Flavour); |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 91 | } |
| 92 | |
Duncan Sands | ee46574 | 2007-08-29 19:01:20 +0000 | [diff] [blame] | 93 | // getX86RegNum - This function maps LLVM register identifiers to their X86 |
| 94 | // specific numbering, which is used in various places encoding instructions. |
| 95 | // |
Nicolas Geoffray | 52e724a | 2008-04-16 20:10:13 +0000 | [diff] [blame] | 96 | unsigned X86RegisterInfo::getX86RegNum(unsigned RegNo) { |
Duncan Sands | ee46574 | 2007-08-29 19:01:20 +0000 | [diff] [blame] | 97 | switch(RegNo) { |
| 98 | case X86::RAX: case X86::EAX: case X86::AX: case X86::AL: return N86::EAX; |
| 99 | case X86::RCX: case X86::ECX: case X86::CX: case X86::CL: return N86::ECX; |
| 100 | case X86::RDX: case X86::EDX: case X86::DX: case X86::DL: return N86::EDX; |
| 101 | case X86::RBX: case X86::EBX: case X86::BX: case X86::BL: return N86::EBX; |
| 102 | case X86::RSP: case X86::ESP: case X86::SP: case X86::SPL: case X86::AH: |
| 103 | return N86::ESP; |
| 104 | case X86::RBP: case X86::EBP: case X86::BP: case X86::BPL: case X86::CH: |
| 105 | return N86::EBP; |
| 106 | case X86::RSI: case X86::ESI: case X86::SI: case X86::SIL: case X86::DH: |
| 107 | return N86::ESI; |
| 108 | case X86::RDI: case X86::EDI: case X86::DI: case X86::DIL: case X86::BH: |
| 109 | return N86::EDI; |
| 110 | |
| 111 | case X86::R8: case X86::R8D: case X86::R8W: case X86::R8B: |
| 112 | return N86::EAX; |
| 113 | case X86::R9: case X86::R9D: case X86::R9W: case X86::R9B: |
| 114 | return N86::ECX; |
| 115 | case X86::R10: case X86::R10D: case X86::R10W: case X86::R10B: |
| 116 | return N86::EDX; |
| 117 | case X86::R11: case X86::R11D: case X86::R11W: case X86::R11B: |
| 118 | return N86::EBX; |
| 119 | case X86::R12: case X86::R12D: case X86::R12W: case X86::R12B: |
| 120 | return N86::ESP; |
| 121 | case X86::R13: case X86::R13D: case X86::R13W: case X86::R13B: |
| 122 | return N86::EBP; |
| 123 | case X86::R14: case X86::R14D: case X86::R14W: case X86::R14B: |
| 124 | return N86::ESI; |
| 125 | case X86::R15: case X86::R15D: case X86::R15W: case X86::R15B: |
| 126 | return N86::EDI; |
| 127 | |
| 128 | case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3: |
| 129 | case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7: |
| 130 | return RegNo-X86::ST0; |
| 131 | |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 132 | case X86::XMM0: case X86::XMM8: case X86::MM0: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 133 | return 0; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 134 | case X86::XMM1: case X86::XMM9: case X86::MM1: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 135 | return 1; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 136 | case X86::XMM2: case X86::XMM10: case X86::MM2: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 137 | return 2; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 138 | case X86::XMM3: case X86::XMM11: case X86::MM3: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 139 | return 3; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 140 | case X86::XMM4: case X86::XMM12: case X86::MM4: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 141 | return 4; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 142 | case X86::XMM5: case X86::XMM13: case X86::MM5: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 143 | return 5; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 144 | case X86::XMM6: case X86::XMM14: case X86::MM6: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 145 | return 6; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 146 | case X86::XMM7: case X86::XMM15: case X86::MM7: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 147 | return 7; |
Duncan Sands | ee46574 | 2007-08-29 19:01:20 +0000 | [diff] [blame] | 148 | |
| 149 | default: |
| 150 | assert(isVirtualRegister(RegNo) && "Unknown physical register!"); |
Torok Edwin | c23197a | 2009-07-14 16:55:14 +0000 | [diff] [blame] | 151 | llvm_unreachable("Register allocator hasn't allocated reg correctly yet!"); |
Duncan Sands | ee46574 | 2007-08-29 19:01:20 +0000 | [diff] [blame] | 152 | return 0; |
| 153 | } |
| 154 | } |
| 155 | |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 156 | const TargetRegisterClass * |
| 157 | X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A, |
| 158 | const TargetRegisterClass *B, |
| 159 | unsigned SubIdx) const { |
| 160 | switch (SubIdx) { |
| 161 | default: return 0; |
| 162 | case 1: |
| 163 | // 8-bit |
| 164 | if (B == &X86::GR8RegClass) { |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 165 | if (A->getSize() == 2 || A->getSize() == 4 || A->getSize() == 8) |
| 166 | return A; |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 167 | } else if (B == &X86::GR8_ABCD_LRegClass || B == &X86::GR8_ABCD_HRegClass) { |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 168 | if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass || |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 169 | A == &X86::GR64_NOREXRegClass || |
| 170 | A == &X86::GR64_NOSPRegClass || |
| 171 | A == &X86::GR64_NOREX_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 172 | return &X86::GR64_ABCDRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 173 | else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass || |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 174 | A == &X86::GR32_NOREXRegClass || |
| 175 | A == &X86::GR32_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 176 | return &X86::GR32_ABCDRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 177 | else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass || |
| 178 | A == &X86::GR16_NOREXRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 179 | return &X86::GR16_ABCDRegClass; |
| 180 | } else if (B == &X86::GR8_NOREXRegClass) { |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 181 | if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass || |
| 182 | A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 183 | return &X86::GR64_NOREXRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 184 | else if (A == &X86::GR64_ABCDRegClass) |
| 185 | return &X86::GR64_ABCDRegClass; |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 186 | else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass || |
| 187 | A == &X86::GR32_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 188 | return &X86::GR32_NOREXRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 189 | else if (A == &X86::GR32_ABCDRegClass) |
| 190 | return &X86::GR32_ABCDRegClass; |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 191 | else if (A == &X86::GR16RegClass || A == &X86::GR16_NOREXRegClass) |
| 192 | return &X86::GR16_NOREXRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 193 | else if (A == &X86::GR16_ABCDRegClass) |
| 194 | return &X86::GR16_ABCDRegClass; |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 195 | } |
| 196 | break; |
| 197 | case 2: |
| 198 | // 8-bit hi |
| 199 | if (B == &X86::GR8_ABCD_HRegClass) { |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 200 | if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass || |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 201 | A == &X86::GR64_NOREXRegClass || |
| 202 | A == &X86::GR64_NOSPRegClass || |
| 203 | A == &X86::GR64_NOREX_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 204 | return &X86::GR64_ABCDRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 205 | else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass || |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 206 | A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 207 | return &X86::GR32_ABCDRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 208 | else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass || |
| 209 | A == &X86::GR16_NOREXRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 210 | return &X86::GR16_ABCDRegClass; |
| 211 | } |
| 212 | break; |
| 213 | case 3: |
| 214 | // 16-bit |
| 215 | if (B == &X86::GR16RegClass) { |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 216 | if (A->getSize() == 4 || A->getSize() == 8) |
| 217 | return A; |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 218 | } else if (B == &X86::GR16_ABCDRegClass) { |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 219 | if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass || |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 220 | A == &X86::GR64_NOREXRegClass || |
| 221 | A == &X86::GR64_NOSPRegClass || |
| 222 | A == &X86::GR64_NOREX_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 223 | return &X86::GR64_ABCDRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 224 | else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass || |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 225 | A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 226 | return &X86::GR32_ABCDRegClass; |
| 227 | } else if (B == &X86::GR16_NOREXRegClass) { |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 228 | if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass || |
| 229 | A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 230 | return &X86::GR64_NOREXRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 231 | else if (A == &X86::GR64_ABCDRegClass) |
| 232 | return &X86::GR64_ABCDRegClass; |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 233 | else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass || |
| 234 | A == &X86::GR32_NOSPRegClass) |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 235 | return &X86::GR32_NOREXRegClass; |
| 236 | else if (A == &X86::GR32_ABCDRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 237 | return &X86::GR64_ABCDRegClass; |
| 238 | } |
| 239 | break; |
| 240 | case 4: |
| 241 | // 32-bit |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 242 | if (B == &X86::GR32RegClass || B == &X86::GR32_NOSPRegClass) { |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 243 | if (A->getSize() == 8) |
| 244 | return A; |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 245 | } else if (B == &X86::GR32_ABCDRegClass) { |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 246 | if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass || |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 247 | A == &X86::GR64_NOREXRegClass || |
| 248 | A == &X86::GR64_NOSPRegClass || |
| 249 | A == &X86::GR64_NOREX_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 250 | return &X86::GR64_ABCDRegClass; |
| 251 | } else if (B == &X86::GR32_NOREXRegClass) { |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 252 | if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass || |
| 253 | A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass) |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 254 | return &X86::GR64_NOREXRegClass; |
Evan Cheng | 753480a | 2009-07-20 19:47:55 +0000 | [diff] [blame] | 255 | else if (A == &X86::GR64_ABCDRegClass) |
| 256 | return &X86::GR64_ABCDRegClass; |
Evan Cheng | 5248468 | 2009-07-18 02:10:10 +0000 | [diff] [blame] | 257 | } |
| 258 | break; |
| 259 | } |
| 260 | return 0; |
| 261 | } |
| 262 | |
Chris Lattner | 2cfd52c | 2009-07-29 20:31:52 +0000 | [diff] [blame] | 263 | const TargetRegisterClass *X86RegisterInfo:: |
| 264 | getPointerRegClass(unsigned Kind) const { |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 265 | switch (Kind) { |
| 266 | default: llvm_unreachable("Unexpected Kind in getPointerRegClass!"); |
| 267 | case 0: // Normal GPRs. |
| 268 | if (TM.getSubtarget<X86Subtarget>().is64Bit()) |
| 269 | return &X86::GR64RegClass; |
| 270 | return &X86::GR32RegClass; |
| 271 | case 1: // Normal GRPs except the stack pointer (for encoding reasons). |
Dan Gohman | 74f6f9a | 2009-08-05 17:40:24 +0000 | [diff] [blame^] | 272 | if (TM.getSubtarget<X86Subtarget>().is64Bit()) |
| 273 | return &X86::GR64_NOSPRegClass; |
| 274 | return &X86::GR32_NOSPRegClass; |
Dan Gohman | a4714e0 | 2009-07-30 01:56:29 +0000 | [diff] [blame] | 275 | } |
Evan Cheng | 770bcc7 | 2009-02-06 17:43:24 +0000 | [diff] [blame] | 276 | } |
| 277 | |
Evan Cheng | ff11026 | 2007-09-26 21:31:07 +0000 | [diff] [blame] | 278 | const TargetRegisterClass * |
| 279 | X86RegisterInfo::getCrossCopyRegClass(const TargetRegisterClass *RC) const { |
Anton Korobeynikov | 4aefd6b | 2008-02-20 12:07:57 +0000 | [diff] [blame] | 280 | if (RC == &X86::CCRRegClass) { |
Evan Cheng | 3f2d9ec | 2007-09-27 21:50:05 +0000 | [diff] [blame] | 281 | if (Is64Bit) |
| 282 | return &X86::GR64RegClass; |
| 283 | else |
| 284 | return &X86::GR32RegClass; |
Anton Korobeynikov | 4aefd6b | 2008-02-20 12:07:57 +0000 | [diff] [blame] | 285 | } |
Evan Cheng | ff11026 | 2007-09-26 21:31:07 +0000 | [diff] [blame] | 286 | return NULL; |
| 287 | } |
Evan Cheng | bf2c8b3 | 2007-03-20 08:09:38 +0000 | [diff] [blame] | 288 | |
Evan Cheng | 64d80e3 | 2007-07-19 01:14:50 +0000 | [diff] [blame] | 289 | const unsigned * |
| 290 | X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 291 | bool callsEHReturn = false; |
| 292 | |
| 293 | if (MF) { |
| 294 | const MachineFrameInfo *MFI = MF->getFrameInfo(); |
| 295 | const MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
| 296 | callsEHReturn = (MMI ? MMI->callsEHReturn() : false); |
| 297 | } |
| 298 | |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 299 | static const unsigned CalleeSavedRegs32Bit[] = { |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 300 | X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0 |
| 301 | }; |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 302 | |
| 303 | static const unsigned CalleeSavedRegs32EHRet[] = { |
| 304 | X86::EAX, X86::EDX, X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0 |
| 305 | }; |
| 306 | |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 307 | static const unsigned CalleeSavedRegs64Bit[] = { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 308 | X86::RBX, X86::R12, X86::R13, X86::R14, X86::R15, X86::RBP, 0 |
| 309 | }; |
| 310 | |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 311 | static const unsigned CalleeSavedRegs64EHRet[] = { |
| 312 | X86::RAX, X86::RDX, X86::RBX, X86::R12, |
| 313 | X86::R13, X86::R14, X86::R15, X86::RBP, 0 |
| 314 | }; |
| 315 | |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 316 | static const unsigned CalleeSavedRegsWin64[] = { |
Anton Korobeynikov | 5979d71 | 2008-09-24 22:03:04 +0000 | [diff] [blame] | 317 | X86::RBX, X86::RBP, X86::RDI, X86::RSI, |
| 318 | X86::R12, X86::R13, X86::R14, X86::R15, |
| 319 | X86::XMM6, X86::XMM7, X86::XMM8, X86::XMM9, |
| 320 | X86::XMM10, X86::XMM11, X86::XMM12, X86::XMM13, |
| 321 | X86::XMM14, X86::XMM15, 0 |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 322 | }; |
| 323 | |
| 324 | if (Is64Bit) { |
| 325 | if (IsWin64) |
| 326 | return CalleeSavedRegsWin64; |
| 327 | else |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 328 | return (callsEHReturn ? CalleeSavedRegs64EHRet : CalleeSavedRegs64Bit); |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 329 | } else { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 330 | return (callsEHReturn ? CalleeSavedRegs32EHRet : CalleeSavedRegs32Bit); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 331 | } |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 332 | } |
| 333 | |
| 334 | const TargetRegisterClass* const* |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 335 | X86RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 336 | bool callsEHReturn = false; |
| 337 | |
| 338 | if (MF) { |
| 339 | const MachineFrameInfo *MFI = MF->getFrameInfo(); |
| 340 | const MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
| 341 | callsEHReturn = (MMI ? MMI->callsEHReturn() : false); |
| 342 | } |
| 343 | |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 344 | static const TargetRegisterClass * const CalleeSavedRegClasses32Bit[] = { |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 345 | &X86::GR32RegClass, &X86::GR32RegClass, |
| 346 | &X86::GR32RegClass, &X86::GR32RegClass, 0 |
| 347 | }; |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 348 | static const TargetRegisterClass * const CalleeSavedRegClasses32EHRet[] = { |
| 349 | &X86::GR32RegClass, &X86::GR32RegClass, |
| 350 | &X86::GR32RegClass, &X86::GR32RegClass, |
| 351 | &X86::GR32RegClass, &X86::GR32RegClass, 0 |
| 352 | }; |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 353 | static const TargetRegisterClass * const CalleeSavedRegClasses64Bit[] = { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 354 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 355 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 356 | &X86::GR64RegClass, &X86::GR64RegClass, 0 |
| 357 | }; |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 358 | static const TargetRegisterClass * const CalleeSavedRegClasses64EHRet[] = { |
| 359 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 360 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 361 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 362 | &X86::GR64RegClass, &X86::GR64RegClass, 0 |
| 363 | }; |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 364 | static const TargetRegisterClass * const CalleeSavedRegClassesWin64[] = { |
Anton Korobeynikov | 5979d71 | 2008-09-24 22:03:04 +0000 | [diff] [blame] | 365 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 366 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 367 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 368 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 369 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 370 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 371 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 372 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 373 | &X86::VR128RegClass, &X86::VR128RegClass, 0 |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 374 | }; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 375 | |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 376 | if (Is64Bit) { |
| 377 | if (IsWin64) |
| 378 | return CalleeSavedRegClassesWin64; |
| 379 | else |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 380 | return (callsEHReturn ? |
| 381 | CalleeSavedRegClasses64EHRet : CalleeSavedRegClasses64Bit); |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 382 | } else { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 383 | return (callsEHReturn ? |
| 384 | CalleeSavedRegClasses32EHRet : CalleeSavedRegClasses32Bit); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 385 | } |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 386 | } |
| 387 | |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 388 | BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const { |
| 389 | BitVector Reserved(getNumRegs()); |
Dan Gohman | a32b7ac | 2008-12-18 01:05:09 +0000 | [diff] [blame] | 390 | // Set the stack-pointer register and its aliases as reserved. |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 391 | Reserved.set(X86::RSP); |
| 392 | Reserved.set(X86::ESP); |
| 393 | Reserved.set(X86::SP); |
| 394 | Reserved.set(X86::SPL); |
Dan Gohman | a32b7ac | 2008-12-18 01:05:09 +0000 | [diff] [blame] | 395 | // Set the frame-pointer register and its aliases as reserved if needed. |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 396 | if (hasFP(MF)) { |
| 397 | Reserved.set(X86::RBP); |
| 398 | Reserved.set(X86::EBP); |
| 399 | Reserved.set(X86::BP); |
| 400 | Reserved.set(X86::BPL); |
| 401 | } |
Dan Gohman | a32b7ac | 2008-12-18 01:05:09 +0000 | [diff] [blame] | 402 | // Mark the x87 stack registers as reserved, since they don't |
| 403 | // behave normally with respect to liveness. We don't fully |
| 404 | // model the effects of x87 stack pushes and pops after |
| 405 | // stackification. |
| 406 | Reserved.set(X86::ST0); |
| 407 | Reserved.set(X86::ST1); |
| 408 | Reserved.set(X86::ST2); |
| 409 | Reserved.set(X86::ST3); |
| 410 | Reserved.set(X86::ST4); |
| 411 | Reserved.set(X86::ST5); |
| 412 | Reserved.set(X86::ST6); |
| 413 | Reserved.set(X86::ST7); |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 414 | return Reserved; |
| 415 | } |
| 416 | |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 417 | //===----------------------------------------------------------------------===// |
| 418 | // Stack Frame Processing methods |
| 419 | //===----------------------------------------------------------------------===// |
| 420 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 421 | static unsigned calculateMaxStackAlignment(const MachineFrameInfo *FFI) { |
| 422 | unsigned MaxAlign = 0; |
| 423 | for (int i = FFI->getObjectIndexBegin(), |
| 424 | e = FFI->getObjectIndexEnd(); i != e; ++i) { |
| 425 | if (FFI->isDeadObjectIndex(i)) |
| 426 | continue; |
| 427 | unsigned Align = FFI->getObjectAlignment(i); |
| 428 | MaxAlign = std::max(MaxAlign, Align); |
| 429 | } |
| 430 | |
| 431 | return MaxAlign; |
| 432 | } |
| 433 | |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 434 | // hasFP - Return true if the specified function should have a dedicated frame |
| 435 | // pointer register. This is true if the function has variable sized allocas or |
| 436 | // if frame pointer elimination is disabled. |
| 437 | // |
Evan Cheng | dc77540 | 2007-01-23 00:57:47 +0000 | [diff] [blame] | 438 | bool X86RegisterInfo::hasFP(const MachineFunction &MF) const { |
Dan Gohman | 8e5f2c6 | 2008-07-07 23:14:23 +0000 | [diff] [blame] | 439 | const MachineFrameInfo *MFI = MF.getFrameInfo(); |
| 440 | const MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 441 | |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 442 | return (NoFramePointerElim || |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 443 | needsStackRealignment(MF) || |
Evan Cheng | 7e7bbf8 | 2007-07-19 00:42:05 +0000 | [diff] [blame] | 444 | MFI->hasVarSizedObjects() || |
Evan Cheng | 184793f | 2008-09-27 01:56:22 +0000 | [diff] [blame] | 445 | MFI->isFrameAddressTaken() || |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 446 | MF.getInfo<X86MachineFunctionInfo>()->getForceFramePointer() || |
| 447 | (MMI && MMI->callsUnwindInit())); |
Misha Brukman | 03c6faf | 2002-12-03 23:11:21 +0000 | [diff] [blame] | 448 | } |
Misha Brukman | 2adb395 | 2002-12-04 23:57:03 +0000 | [diff] [blame] | 449 | |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 450 | bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const { |
Nick Lewycky | 9c0f146 | 2009-03-19 05:51:39 +0000 | [diff] [blame] | 451 | const MachineFrameInfo *MFI = MF.getFrameInfo(); |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 452 | |
Anton Korobeynikov | 35410a4 | 2008-04-23 18:16:43 +0000 | [diff] [blame] | 453 | // FIXME: Currently we don't support stack realignment for functions with |
| 454 | // variable-sized allocas |
Anton Korobeynikov | 941ff58 | 2008-04-23 18:24:25 +0000 | [diff] [blame] | 455 | return (RealignStack && |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 456 | (MFI->getMaxAlignment() > StackAlign && |
Anton Korobeynikov | cfcd20e | 2008-04-23 18:17:11 +0000 | [diff] [blame] | 457 | !MFI->hasVarSizedObjects())); |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 458 | } |
| 459 | |
Evan Cheng | 7e7bbf8 | 2007-07-19 00:42:05 +0000 | [diff] [blame] | 460 | bool X86RegisterInfo::hasReservedCallFrame(MachineFunction &MF) const { |
| 461 | return !MF.getFrameInfo()->hasVarSizedObjects(); |
| 462 | } |
| 463 | |
Evan Cheng | 910139f | 2009-07-09 06:53:48 +0000 | [diff] [blame] | 464 | bool X86RegisterInfo::hasReservedSpillSlot(MachineFunction &MF, unsigned Reg, |
| 465 | int &FrameIdx) const { |
| 466 | if (Reg == FramePtr && hasFP(MF)) { |
| 467 | FrameIdx = MF.getFrameInfo()->getObjectIndexBegin(); |
| 468 | return true; |
| 469 | } |
| 470 | return false; |
| 471 | } |
| 472 | |
| 473 | |
Anton Korobeynikov | 82751e3 | 2008-04-23 18:18:36 +0000 | [diff] [blame] | 474 | int |
| 475 | X86RegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const { |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 476 | const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo(); |
| 477 | MachineFrameInfo *MFI = MF.getFrameInfo(); |
| 478 | |
| 479 | int Offset = MFI->getObjectOffset(FI) - TFI.getOffsetOfLocalArea(); |
| 480 | uint64_t StackSize = MFI->getStackSize(); |
Anton Korobeynikov | 82751e3 | 2008-04-23 18:18:36 +0000 | [diff] [blame] | 481 | |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 482 | if (needsStackRealignment(MF)) { |
| 483 | if (FI < 0) |
| 484 | // Skip the saved EBP |
| 485 | Offset += SlotSize; |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 486 | else { |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 487 | unsigned Align = MFI->getObjectAlignment(FI); |
Dale Johannesen | b5dae00 | 2008-06-26 01:51:13 +0000 | [diff] [blame] | 488 | assert( (-(Offset + StackSize)) % Align == 0); |
Devang Patel | fd1c6c3 | 2008-12-23 21:56:28 +0000 | [diff] [blame] | 489 | Align = 0; |
Dale Johannesen | b5dae00 | 2008-06-26 01:51:13 +0000 | [diff] [blame] | 490 | return Offset + StackSize; |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 491 | } |
Anton Korobeynikov | d1c133a | 2008-04-23 18:19:23 +0000 | [diff] [blame] | 492 | |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 493 | // FIXME: Support tail calls |
| 494 | } else { |
| 495 | if (!hasFP(MF)) |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 496 | return Offset + StackSize; |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 497 | |
| 498 | // Skip the saved EBP |
| 499 | Offset += SlotSize; |
| 500 | |
| 501 | // Skip the RETADDR move area |
| 502 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
| 503 | int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); |
| 504 | if (TailCallReturnAddrDelta < 0) Offset -= TailCallReturnAddrDelta; |
| 505 | } |
| 506 | |
Anton Korobeynikov | 82751e3 | 2008-04-23 18:18:36 +0000 | [diff] [blame] | 507 | return Offset; |
| 508 | } |
| 509 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 510 | void X86RegisterInfo:: |
| 511 | eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, |
| 512 | MachineBasicBlock::iterator I) const { |
Evan Cheng | 7e7bbf8 | 2007-07-19 00:42:05 +0000 | [diff] [blame] | 513 | if (!hasReservedCallFrame(MF)) { |
| 514 | // If the stack pointer can be changed after prologue, turn the |
| 515 | // adjcallstackup instruction into a 'sub ESP, <amt>' and the |
| 516 | // adjcallstackdown instruction into 'add ESP, <amt>' |
| 517 | // TODO: consider using push / pop instead of sub + store / add |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 518 | MachineInstr *Old = I; |
Chris Lattner | 6180780 | 2007-04-25 04:25:10 +0000 | [diff] [blame] | 519 | uint64_t Amount = Old->getOperand(0).getImm(); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 520 | if (Amount != 0) { |
Chris Lattner | f158da2 | 2003-01-16 02:20:12 +0000 | [diff] [blame] | 521 | // We need to keep the stack aligned properly. To do this, we round the |
| 522 | // amount of space needed for the outgoing arguments up to the next |
| 523 | // alignment boundary. |
Evan Cheng | db807ed | 2007-11-05 07:30:01 +0000 | [diff] [blame] | 524 | Amount = (Amount+StackAlign-1)/StackAlign*StackAlign; |
Chris Lattner | f158da2 | 2003-01-16 02:20:12 +0000 | [diff] [blame] | 525 | |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 526 | MachineInstr *New = 0; |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 527 | if (Old->getOpcode() == getCallFrameSetupOpcode()) { |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 528 | New = BuildMI(MF, Old->getDebugLoc(), |
| 529 | TII.get(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri), |
Evan Cheng | bdf7b5d | 2008-08-25 21:58:43 +0000 | [diff] [blame] | 530 | StackPtr).addReg(StackPtr).addImm(Amount); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 531 | } else { |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 532 | assert(Old->getOpcode() == getCallFrameDestroyOpcode()); |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 533 | // factor out the amount the callee already popped. |
Chris Lattner | 6180780 | 2007-04-25 04:25:10 +0000 | [diff] [blame] | 534 | uint64_t CalleeAmt = Old->getOperand(1).getImm(); |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 535 | Amount -= CalleeAmt; |
Chris Lattner | d77525d | 2006-02-03 18:20:04 +0000 | [diff] [blame] | 536 | if (Amount) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 537 | unsigned Opc = (Amount < 128) ? |
| 538 | (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) : |
| 539 | (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri); |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 540 | New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr) |
Evan Cheng | bdf7b5d | 2008-08-25 21:58:43 +0000 | [diff] [blame] | 541 | .addReg(StackPtr).addImm(Amount); |
Chris Lattner | d77525d | 2006-02-03 18:20:04 +0000 | [diff] [blame] | 542 | } |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 543 | } |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 544 | |
Dan Gohman | d293e0d | 2009-02-11 19:50:24 +0000 | [diff] [blame] | 545 | if (New) { |
| 546 | // The EFLAGS implicit def is dead. |
| 547 | New->getOperand(3).setIsDead(); |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 548 | |
Dan Gohman | d293e0d | 2009-02-11 19:50:24 +0000 | [diff] [blame] | 549 | // Replace the pseudo instruction with a new instruction... |
| 550 | MBB.insert(I, New); |
| 551 | } |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 552 | } |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 553 | } else if (I->getOpcode() == getCallFrameDestroyOpcode()) { |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 554 | // If we are performing frame pointer elimination and if the callee pops |
| 555 | // something off the stack pointer, add it back. We do this until we have |
| 556 | // more advanced stack pointer tracking ability. |
Chris Lattner | 6180780 | 2007-04-25 04:25:10 +0000 | [diff] [blame] | 557 | if (uint64_t CalleeAmt = I->getOperand(1).getImm()) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 558 | unsigned Opc = (CalleeAmt < 128) ? |
| 559 | (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) : |
| 560 | (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri); |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 561 | MachineInstr *Old = I; |
Jeff Cohen | 00b16889 | 2005-07-27 06:12:32 +0000 | [diff] [blame] | 562 | MachineInstr *New = |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 563 | BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), |
| 564 | StackPtr).addReg(StackPtr).addImm(CalleeAmt); |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 565 | // The EFLAGS implicit def is dead. |
| 566 | New->getOperand(3).setIsDead(); |
| 567 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 568 | MBB.insert(I, New); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 569 | } |
| 570 | } |
| 571 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 572 | MBB.erase(I); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 573 | } |
| 574 | |
Evan Cheng | 5e6df46 | 2007-02-28 00:21:17 +0000 | [diff] [blame] | 575 | void X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, |
Evan Cheng | 97de913 | 2007-05-01 09:13:03 +0000 | [diff] [blame] | 576 | int SPAdj, RegScavenger *RS) const{ |
| 577 | assert(SPAdj == 0 && "Unexpected"); |
| 578 | |
Chris Lattner | d264bec | 2003-01-13 00:50:33 +0000 | [diff] [blame] | 579 | unsigned i = 0; |
Alkis Evlogimenos | c0b9dc5 | 2004-02-12 02:27:10 +0000 | [diff] [blame] | 580 | MachineInstr &MI = *II; |
Nate Begeman | f8be5e9 | 2004-08-14 22:05:10 +0000 | [diff] [blame] | 581 | MachineFunction &MF = *MI.getParent()->getParent(); |
Dan Gohman | d735b80 | 2008-10-03 15:45:36 +0000 | [diff] [blame] | 582 | while (!MI.getOperand(i).isFI()) { |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 583 | ++i; |
| 584 | assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!"); |
| 585 | } |
| 586 | |
Chris Lattner | 8aa797a | 2007-12-30 23:10:15 +0000 | [diff] [blame] | 587 | int FrameIndex = MI.getOperand(i).getIndex(); |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 588 | |
| 589 | unsigned BasePtr; |
| 590 | if (needsStackRealignment(MF)) |
| 591 | BasePtr = (FrameIndex < 0 ? FramePtr : StackPtr); |
| 592 | else |
| 593 | BasePtr = (hasFP(MF) ? FramePtr : StackPtr); |
| 594 | |
Chris Lattner | d264bec | 2003-01-13 00:50:33 +0000 | [diff] [blame] | 595 | // This must be part of a four operand memory reference. Replace the |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 596 | // FrameIndex with base register with EBP. Add an offset to the offset. |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 597 | MI.getOperand(i).ChangeToRegister(BasePtr, false); |
Chris Lattner | d264bec | 2003-01-13 00:50:33 +0000 | [diff] [blame] | 598 | |
Dan Gohman | 8277970 | 2008-12-24 00:27:51 +0000 | [diff] [blame] | 599 | // Now add the frame object offset to the offset from EBP. |
| 600 | if (MI.getOperand(i+3).isImm()) { |
| 601 | // Offset is a 32-bit integer. |
| 602 | int Offset = getFrameIndexOffset(MF, FrameIndex) + |
| 603 | (int)(MI.getOperand(i+3).getImm()); |
| 604 | |
| 605 | MI.getOperand(i+3).ChangeToImmediate(Offset); |
| 606 | } else { |
| 607 | // Offset is symbolic. This is extremely rare. |
| 608 | uint64_t Offset = getFrameIndexOffset(MF, FrameIndex) + |
| 609 | (uint64_t)MI.getOperand(i+3).getOffset(); |
| 610 | MI.getOperand(i+3).setOffset(Offset); |
| 611 | } |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 612 | } |
| 613 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 614 | void |
Anton Korobeynikov | b51dce3 | 2008-04-23 18:20:17 +0000 | [diff] [blame] | 615 | X86RegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF, |
| 616 | RegScavenger *RS) const { |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 617 | MachineFrameInfo *MFI = MF.getFrameInfo(); |
Anton Korobeynikov | b51dce3 | 2008-04-23 18:20:17 +0000 | [diff] [blame] | 618 | |
| 619 | // Calculate and set max stack object alignment early, so we can decide |
| 620 | // whether we will need stack realignment (and thus FP). |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 621 | unsigned MaxAlign = std::max(MFI->getMaxAlignment(), |
| 622 | calculateMaxStackAlignment(MFI)); |
Anton Korobeynikov | b51dce3 | 2008-04-23 18:20:17 +0000 | [diff] [blame] | 623 | |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 624 | MFI->setMaxAlignment(MaxAlign); |
Anton Korobeynikov | b51dce3 | 2008-04-23 18:20:17 +0000 | [diff] [blame] | 625 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 626 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
| 627 | int32_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); |
| 628 | if (TailCallReturnAddrDelta < 0) { |
| 629 | // create RETURNADDR area |
| 630 | // arg |
| 631 | // arg |
| 632 | // RETADDR |
| 633 | // { ... |
| 634 | // RETADDR area |
| 635 | // ... |
| 636 | // } |
| 637 | // [EBP] |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 638 | MFI->CreateFixedObject(-TailCallReturnAddrDelta, |
| 639 | (-1*SlotSize)+TailCallReturnAddrDelta); |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 640 | } |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 641 | |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 642 | if (hasFP(MF)) { |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 643 | assert((TailCallReturnAddrDelta <= 0) && |
| 644 | "The Delta should always be zero or negative"); |
Anton Korobeynikov | dd93f5e | 2009-08-03 08:14:30 +0000 | [diff] [blame] | 645 | const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo(); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 646 | // Create a frame entry for the EBP register that must be saved. |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 647 | int FrameIdx = MFI->CreateFixedObject(SlotSize, |
Anton Korobeynikov | dd93f5e | 2009-08-03 08:14:30 +0000 | [diff] [blame] | 648 | -(int)SlotSize + |
| 649 | TFI.getOffsetOfLocalArea() + |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 650 | TailCallReturnAddrDelta); |
| 651 | assert(FrameIdx == MFI->getObjectIndexBegin() && |
Chris Lattner | 96c3d2e | 2004-02-15 00:15:37 +0000 | [diff] [blame] | 652 | "Slot for EBP register must be last in order to be found!"); |
Devang Patel | fd1c6c3 | 2008-12-23 21:56:28 +0000 | [diff] [blame] | 653 | FrameIdx = 0; |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 654 | } |
| 655 | } |
| 656 | |
Evan Cheng | a24dddd | 2007-04-26 01:09:28 +0000 | [diff] [blame] | 657 | /// emitSPUpdate - Emit a series of instructions to increment / decrement the |
| 658 | /// stack pointer by a constant value. |
| 659 | static |
| 660 | void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, |
| 661 | unsigned StackPtr, int64_t NumBytes, bool Is64Bit, |
| 662 | const TargetInstrInfo &TII) { |
| 663 | bool isSub = NumBytes < 0; |
| 664 | uint64_t Offset = isSub ? -NumBytes : NumBytes; |
| 665 | unsigned Opc = isSub |
| 666 | ? ((Offset < 128) ? |
| 667 | (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) : |
| 668 | (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri)) |
| 669 | : ((Offset < 128) ? |
| 670 | (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) : |
| 671 | (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri)); |
| 672 | uint64_t Chunk = (1LL << 31) - 1; |
Bill Wendling | 5a45d76 | 2009-02-21 01:11:36 +0000 | [diff] [blame] | 673 | DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() : |
| 674 | DebugLoc::getUnknownLoc()); |
Evan Cheng | a24dddd | 2007-04-26 01:09:28 +0000 | [diff] [blame] | 675 | |
| 676 | while (Offset) { |
| 677 | uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset; |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 678 | MachineInstr *MI = |
Dale Johannesen | 8d13f8f | 2009-02-13 02:33:27 +0000 | [diff] [blame] | 679 | BuildMI(MBB, MBBI, DL, TII.get(Opc), StackPtr) |
| 680 | .addReg(StackPtr).addImm(ThisVal); |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 681 | // The EFLAGS implicit def is dead. |
| 682 | MI->getOperand(3).setIsDead(); |
Evan Cheng | a24dddd | 2007-04-26 01:09:28 +0000 | [diff] [blame] | 683 | Offset -= ThisVal; |
| 684 | } |
| 685 | } |
| 686 | |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 687 | // mergeSPUpdatesUp - Merge two stack-manipulating instructions upper iterator. |
| 688 | static |
| 689 | void mergeSPUpdatesUp(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, |
| 690 | unsigned StackPtr, uint64_t *NumBytes = NULL) { |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 691 | if (MBBI == MBB.begin()) return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 692 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 693 | MachineBasicBlock::iterator PI = prior(MBBI); |
| 694 | unsigned Opc = PI->getOpcode(); |
| 695 | if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 || |
| 696 | Opc == X86::ADD32ri || Opc == X86::ADD32ri8) && |
| 697 | PI->getOperand(0).getReg() == StackPtr) { |
| 698 | if (NumBytes) |
| 699 | *NumBytes += PI->getOperand(2).getImm(); |
| 700 | MBB.erase(PI); |
| 701 | } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 || |
| 702 | Opc == X86::SUB32ri || Opc == X86::SUB32ri8) && |
| 703 | PI->getOperand(0).getReg() == StackPtr) { |
| 704 | if (NumBytes) |
| 705 | *NumBytes -= PI->getOperand(2).getImm(); |
| 706 | MBB.erase(PI); |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 707 | } |
| 708 | } |
| 709 | |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 710 | // mergeSPUpdatesUp - Merge two stack-manipulating instructions lower iterator. |
| 711 | static |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 712 | void mergeSPUpdatesDown(MachineBasicBlock &MBB, |
| 713 | MachineBasicBlock::iterator &MBBI, |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 714 | unsigned StackPtr, uint64_t *NumBytes = NULL) { |
Chris Lattner | f443ba7 | 2007-10-07 22:00:31 +0000 | [diff] [blame] | 715 | return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 716 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 717 | if (MBBI == MBB.end()) return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 718 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 719 | MachineBasicBlock::iterator NI = next(MBBI); |
| 720 | if (NI == MBB.end()) return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 721 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 722 | unsigned Opc = NI->getOpcode(); |
| 723 | if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 || |
| 724 | Opc == X86::ADD32ri || Opc == X86::ADD32ri8) && |
| 725 | NI->getOperand(0).getReg() == StackPtr) { |
| 726 | if (NumBytes) |
| 727 | *NumBytes -= NI->getOperand(2).getImm(); |
| 728 | MBB.erase(NI); |
| 729 | MBBI = NI; |
| 730 | } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 || |
| 731 | Opc == X86::SUB32ri || Opc == X86::SUB32ri8) && |
| 732 | NI->getOperand(0).getReg() == StackPtr) { |
| 733 | if (NumBytes) |
| 734 | *NumBytes += NI->getOperand(2).getImm(); |
| 735 | MBB.erase(NI); |
| 736 | MBBI = NI; |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 737 | } |
| 738 | } |
| 739 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 740 | /// mergeSPUpdates - Checks the instruction before/after the passed |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 741 | /// instruction. If it is an ADD/SUB instruction it is deleted |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 742 | /// argument and the stack adjustment is returned as a positive value for ADD |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 743 | /// and a negative for SUB. |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 744 | static int mergeSPUpdates(MachineBasicBlock &MBB, |
| 745 | MachineBasicBlock::iterator &MBBI, |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 746 | unsigned StackPtr, |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 747 | bool doMergeWithPrevious) { |
| 748 | |
| 749 | if ((doMergeWithPrevious && MBBI == MBB.begin()) || |
| 750 | (!doMergeWithPrevious && MBBI == MBB.end())) |
| 751 | return 0; |
| 752 | |
| 753 | int Offset = 0; |
| 754 | |
| 755 | MachineBasicBlock::iterator PI = doMergeWithPrevious ? prior(MBBI) : MBBI; |
| 756 | MachineBasicBlock::iterator NI = doMergeWithPrevious ? 0 : next(MBBI); |
| 757 | unsigned Opc = PI->getOpcode(); |
| 758 | if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 || |
| 759 | Opc == X86::ADD32ri || Opc == X86::ADD32ri8) && |
| 760 | PI->getOperand(0).getReg() == StackPtr){ |
| 761 | Offset += PI->getOperand(2).getImm(); |
| 762 | MBB.erase(PI); |
| 763 | if (!doMergeWithPrevious) MBBI = NI; |
| 764 | } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 || |
| 765 | Opc == X86::SUB32ri || Opc == X86::SUB32ri8) && |
| 766 | PI->getOperand(0).getReg() == StackPtr) { |
| 767 | Offset -= PI->getOperand(2).getImm(); |
| 768 | MBB.erase(PI); |
| 769 | if (!doMergeWithPrevious) MBBI = NI; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 770 | } |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 771 | |
| 772 | return Offset; |
| 773 | } |
| 774 | |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 775 | void X86RegisterInfo::emitCalleeSavedFrameMoves(MachineFunction &MF, |
| 776 | unsigned LabelId, |
| 777 | unsigned FramePtr) const { |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 778 | MachineFrameInfo *MFI = MF.getFrameInfo(); |
| 779 | MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 780 | if (!MMI) return; |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 781 | |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 782 | // Add callee saved registers to move list. |
| 783 | const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo(); |
| 784 | if (CSI.empty()) return; |
| 785 | |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 786 | std::vector<MachineMove> &Moves = MMI->getFrameMoves(); |
| 787 | const TargetData *TD = MF.getTarget().getTargetData(); |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 788 | bool HasFP = hasFP(MF); |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 789 | |
| 790 | // Calculate amount of bytes used for return address storing |
| 791 | int stackGrowth = |
| 792 | (MF.getTarget().getFrameInfo()->getStackGrowthDirection() == |
| 793 | TargetFrameInfo::StackGrowsUp ? |
| 794 | TD->getPointerSize() : -TD->getPointerSize()); |
| 795 | |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 796 | // FIXME: This is dirty hack. The code itself is pretty mess right now. |
| 797 | // It should be rewritten from scratch and generalized sometimes. |
| 798 | |
| 799 | // Determine maximum offset (minumum due to stack growth) |
| 800 | int64_t MaxOffset = 0; |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 801 | for (std::vector<CalleeSavedInfo>::const_iterator |
| 802 | I = CSI.begin(), E = CSI.end(); I != E; ++I) |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 803 | MaxOffset = std::min(MaxOffset, |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 804 | MFI->getObjectOffset(I->getFrameIdx())); |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 805 | |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 806 | // Calculate offsets. |
| 807 | int64_t saveAreaOffset = (HasFP ? 3 : 2) * stackGrowth; |
| 808 | for (std::vector<CalleeSavedInfo>::const_iterator |
| 809 | I = CSI.begin(), E = CSI.end(); I != E; ++I) { |
| 810 | int64_t Offset = MFI->getObjectOffset(I->getFrameIdx()); |
| 811 | unsigned Reg = I->getReg(); |
| 812 | Offset = MaxOffset - Offset + saveAreaOffset; |
| 813 | |
Duncan Sands | daf2212 | 2009-07-23 19:00:02 +0000 | [diff] [blame] | 814 | // Don't output a new machine move if we're re-saving the frame |
| 815 | // pointer. This happens when the PrologEpilogInserter has inserted an extra |
| 816 | // "PUSH" of the frame pointer -- the "emitPrologue" method automatically |
| 817 | // generates one when frame pointers are used. If we generate a "machine |
| 818 | // move" for this extra "PUSH", the linker will lose track of the fact that |
| 819 | // the frame pointer should have the value of the first "PUSH" when it's |
| 820 | // trying to unwind. |
| 821 | // |
| 822 | // FIXME: This looks inelegant. It's possibly correct, but it's covering up |
| 823 | // another bug. I.e., one where we generate a prolog like this: |
| 824 | // |
| 825 | // pushl %ebp |
| 826 | // movl %esp, %ebp |
| 827 | // pushl %ebp |
| 828 | // pushl %esi |
| 829 | // ... |
| 830 | // |
| 831 | // The immediate re-push of EBP is unnecessary. At the least, it's an |
| 832 | // optimization bug. EBP can be used as a scratch register in certain |
| 833 | // cases, but probably not when we have a frame pointer. |
| 834 | if (HasFP && FramePtr == Reg) |
| 835 | continue; |
| 836 | |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 837 | MachineLocation CSDst(MachineLocation::VirtualFP, Offset); |
| 838 | MachineLocation CSSrc(Reg); |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 839 | Moves.push_back(MachineMove(LabelId, CSDst, CSSrc)); |
Bill Wendling | fe7f294 | 2009-06-16 04:12:45 +0000 | [diff] [blame] | 840 | } |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 841 | } |
| 842 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 843 | void X86RegisterInfo::emitPrologue(MachineFunction &MF) const { |
Chris Lattner | 198ab64 | 2002-12-15 20:06:35 +0000 | [diff] [blame] | 844 | MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB |
Chris Lattner | eafa423 | 2003-01-15 22:57:35 +0000 | [diff] [blame] | 845 | MachineFrameInfo *MFI = MF.getFrameInfo(); |
Evan Cheng | 3649b0e | 2006-06-02 22:38:37 +0000 | [diff] [blame] | 846 | const Function* Fn = MF.getFunction(); |
| 847 | const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>(); |
Jim Laskey | 44c3b9f | 2007-01-26 21:22:28 +0000 | [diff] [blame] | 848 | MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 849 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
| 850 | MachineBasicBlock::iterator MBBI = MBB.begin(); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 851 | bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) || |
Dale Johannesen | 4e1b794 | 2008-04-08 00:10:24 +0000 | [diff] [blame] | 852 | !Fn->doesNotThrow() || |
Dale Johannesen | 3541af7 | 2008-04-14 17:54:17 +0000 | [diff] [blame] | 853 | UnwindTablesMandatory; |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 854 | bool HasFP = hasFP(MF); |
Devang Patel | 369de26 | 2009-06-17 00:48:26 +0000 | [diff] [blame] | 855 | DebugLoc DL; |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 856 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 857 | // Get the number of bytes to allocate from the FrameInfo. |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 858 | uint64_t StackSize = MFI->getStackSize(); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 859 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 860 | // Get desired stack alignment |
| 861 | uint64_t MaxAlign = MFI->getMaxAlignment(); |
| 862 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 863 | // Add RETADDR move area to callee saved frame size. |
| 864 | int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 865 | if (TailCallReturnAddrDelta < 0) |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 866 | X86FI->setCalleeSavedFrameSize( |
| 867 | X86FI->getCalleeSavedFrameSize() +(-TailCallReturnAddrDelta)); |
Evan Cheng | d9245ca | 2006-04-14 07:26:43 +0000 | [diff] [blame] | 868 | |
Dan Gohman | 336b636 | 2009-01-27 00:40:06 +0000 | [diff] [blame] | 869 | // If this is x86-64 and the Red Zone is not disabled, if we are a leaf |
| 870 | // function, and use up to 128 bytes of stack space, don't have a frame |
| 871 | // pointer, calls, or dynamic alloca then we do not need to adjust the |
| 872 | // stack pointer (we fit in the Red Zone). |
Devang Patel | d18e31a | 2009-06-04 22:05:33 +0000 | [diff] [blame] | 873 | bool DisableRedZone = Fn->hasFnAttr(Attribute::NoRedZone); |
Dan Gohman | 336b636 | 2009-01-27 00:40:06 +0000 | [diff] [blame] | 874 | if (Is64Bit && !DisableRedZone && |
| 875 | !needsStackRealignment(MF) && |
| 876 | !MFI->hasVarSizedObjects() && // No dynamic alloca. |
Eli Friedman | 9a41712 | 2009-06-04 02:02:01 +0000 | [diff] [blame] | 877 | !MFI->hasCalls() && // No calls. |
| 878 | !Subtarget->isTargetWin64()) { // Win64 has no Red Zone |
Dan Gohman | 336b636 | 2009-01-27 00:40:06 +0000 | [diff] [blame] | 879 | uint64_t MinSize = X86FI->getCalleeSavedFrameSize(); |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 880 | if (HasFP) MinSize += SlotSize; |
Dan Gohman | 336b636 | 2009-01-27 00:40:06 +0000 | [diff] [blame] | 881 | StackSize = std::max(MinSize, |
| 882 | StackSize > 128 ? StackSize - 128 : 0); |
| 883 | MFI->setStackSize(StackSize); |
Anton Korobeynikov | cf6b739 | 2009-08-03 08:12:53 +0000 | [diff] [blame] | 884 | } else if (Subtarget->isTargetWin64()) { |
| 885 | // We need to always allocate 32 bytes as register spill area. |
| 886 | // FIXME: we might reuse these 32 bytes for leaf functions. |
| 887 | StackSize += 32; |
| 888 | MFI->setStackSize(StackSize); |
Dan Gohman | 336b636 | 2009-01-27 00:40:06 +0000 | [diff] [blame] | 889 | } |
| 890 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 891 | // Insert stack pointer adjustment for later moving of return addr. Only |
| 892 | // applies to tail call optimized functions where the callee argument stack |
| 893 | // size is bigger than the callers. |
| 894 | if (TailCallReturnAddrDelta < 0) { |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 895 | MachineInstr *MI = |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 896 | BuildMI(MBB, MBBI, DL, TII.get(Is64Bit? X86::SUB64ri32 : X86::SUB32ri), |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 897 | StackPtr).addReg(StackPtr).addImm(-TailCallReturnAddrDelta); |
| 898 | // The EFLAGS implicit def is dead. |
| 899 | MI->getOperand(3).setIsDead(); |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 900 | } |
| 901 | |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 902 | // uint64_t StackSize = MFI->getStackSize(); |
| 903 | std::vector<MachineMove> &Moves = MMI->getFrameMoves(); |
| 904 | const TargetData *TD = MF.getTarget().getTargetData(); |
| 905 | int stackGrowth = |
| 906 | (MF.getTarget().getFrameInfo()->getStackGrowthDirection() == |
| 907 | TargetFrameInfo::StackGrowsUp ? |
| 908 | TD->getPointerSize() : -TD->getPointerSize()); |
| 909 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 910 | uint64_t NumBytes = 0; |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 911 | if (HasFP) { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 912 | // Calculate required stack adjustment |
| 913 | uint64_t FrameSize = StackSize - SlotSize; |
| 914 | if (needsStackRealignment(MF)) |
| 915 | FrameSize = (FrameSize + MaxAlign - 1)/MaxAlign*MaxAlign; |
| 916 | |
| 917 | NumBytes = FrameSize - X86FI->getCalleeSavedFrameSize(); |
| 918 | |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 919 | // Get the offset of the stack slot for the EBP register, which is |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 920 | // guaranteed to be the last slot by processFunctionBeforeFrameFinalized. |
| 921 | // Update the frame offset adjustment. |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 922 | MFI->setOffsetAdjustment(-NumBytes); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 923 | |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 924 | // Save EBP/RBP into the appropriate stack slot... |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 925 | BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::PUSH64r : X86::PUSH32r)) |
Bill Wendling | 587daed | 2009-05-13 21:33:08 +0000 | [diff] [blame] | 926 | .addReg(FramePtr, RegState::Kill); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 927 | |
Bill Wendling | 92c1e12 | 2009-02-13 02:16:35 +0000 | [diff] [blame] | 928 | if (needsFrameMoves) { |
| 929 | // Mark effective beginning of when frame pointer becomes valid. |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 930 | unsigned FrameLabelId = MMI->NextLabelID(); |
Bill Wendling | 92c1e12 | 2009-02-13 02:16:35 +0000 | [diff] [blame] | 931 | BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId); |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 932 | |
| 933 | // Define the current CFA rule to use the provided offset. |
| 934 | if (StackSize) { |
| 935 | MachineLocation SPDst(MachineLocation::VirtualFP); |
| 936 | MachineLocation SPSrc(MachineLocation::VirtualFP, |
| 937 | HasFP ? 2 * stackGrowth : |
| 938 | -StackSize + stackGrowth); |
| 939 | Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc)); |
| 940 | } else { |
| 941 | // FIXME: Verify & implement for FP |
| 942 | MachineLocation SPDst(StackPtr); |
| 943 | MachineLocation SPSrc(StackPtr, stackGrowth); |
| 944 | Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc)); |
| 945 | } |
| 946 | |
| 947 | // Change the rule for the FramePtr to be an "offset" rule. |
| 948 | MachineLocation FPDst(MachineLocation::VirtualFP, 2 * stackGrowth); |
| 949 | MachineLocation FPSrc(FramePtr); |
| 950 | Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc)); |
Bill Wendling | 92c1e12 | 2009-02-13 02:16:35 +0000 | [diff] [blame] | 951 | } |
| 952 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 953 | // Update EBP with the new base value... |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 954 | BuildMI(MBB, MBBI, DL, |
| 955 | TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), FramePtr) |
| 956 | .addReg(StackPtr); |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 957 | |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 958 | if (needsFrameMoves) { |
| 959 | unsigned FrameLabelId = MMI->NextLabelID(); |
| 960 | BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId); |
| 961 | |
| 962 | // Define the current CFA to use the EBP/RBP register. |
| 963 | MachineLocation FPDst(FramePtr); |
| 964 | MachineLocation FPSrc(MachineLocation::VirtualFP); |
| 965 | Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc)); |
| 966 | } |
| 967 | |
Dan Gohman | 34d6ad7 | 2008-12-18 22:01:52 +0000 | [diff] [blame] | 968 | // Mark the FramePtr as live-in in every block except the entry. |
| 969 | for (MachineFunction::iterator I = next(MF.begin()), E = MF.end(); |
| 970 | I != E; ++I) |
| 971 | I->addLiveIn(FramePtr); |
| 972 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 973 | // Realign stack |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 974 | if (needsStackRealignment(MF)) { |
| 975 | MachineInstr *MI = |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 976 | BuildMI(MBB, MBBI, DL, |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 977 | TII.get(Is64Bit ? X86::AND64ri32 : X86::AND32ri), |
| 978 | StackPtr).addReg(StackPtr).addImm(-MaxAlign); |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 979 | |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 980 | // The EFLAGS implicit def is dead. |
| 981 | MI->getOperand(3).setIsDead(); |
| 982 | } |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 983 | } else { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 984 | NumBytes = StackSize - X86FI->getCalleeSavedFrameSize(); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 985 | } |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 986 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 987 | // Skip the callee-saved push instructions. |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 988 | bool RegsSaved = false; |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 989 | while (MBBI != MBB.end() && |
| 990 | (MBBI->getOpcode() == X86::PUSH32r || |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 991 | MBBI->getOpcode() == X86::PUSH64r)) { |
| 992 | RegsSaved = true; |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 993 | ++MBBI; |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 994 | } |
| 995 | |
| 996 | if (RegsSaved && needsFrameMoves) { |
| 997 | // Mark end of callee-saved push instructions. |
| 998 | unsigned LabelId = MMI->NextLabelID(); |
| 999 | BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId); |
| 1000 | |
| 1001 | // Emit DWARF info specifying the offsets of the callee-saved registers. |
Bill Wendling | d15f45f | 2009-07-09 22:30:02 +0000 | [diff] [blame] | 1002 | emitCalleeSavedFrameMoves(MF, LabelId, HasFP ? FramePtr : StackPtr); |
Bill Wendling | c3d505c | 2009-07-08 21:02:53 +0000 | [diff] [blame] | 1003 | } |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 1004 | |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1005 | if (MBBI != MBB.end()) |
| 1006 | DL = MBBI->getDebugLoc(); |
| 1007 | |
Bill Wendling | 3ae67f5 | 2009-06-09 20:08:51 +0000 | [diff] [blame] | 1008 | // Adjust stack pointer: ESP -= numbytes. |
| 1009 | if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) { |
| 1010 | // Check, whether EAX is livein for this function. |
| 1011 | bool isEAXAlive = false; |
| 1012 | for (MachineRegisterInfo::livein_iterator |
Chris Lattner | 84bc542 | 2007-12-31 04:13:23 +0000 | [diff] [blame] | 1013 | II = MF.getRegInfo().livein_begin(), |
| 1014 | EE = MF.getRegInfo().livein_end(); (II != EE) && !isEAXAlive; ++II) { |
Bill Wendling | 3ae67f5 | 2009-06-09 20:08:51 +0000 | [diff] [blame] | 1015 | unsigned Reg = II->first; |
| 1016 | isEAXAlive = (Reg == X86::EAX || Reg == X86::AX || |
| 1017 | Reg == X86::AH || Reg == X86::AL); |
Evan Cheng | 004fb92 | 2006-06-13 05:14:44 +0000 | [diff] [blame] | 1018 | } |
Bill Wendling | 3ae67f5 | 2009-06-09 20:08:51 +0000 | [diff] [blame] | 1019 | |
| 1020 | // Function prologue calls _alloca to probe the stack when allocating more |
| 1021 | // than 4k bytes in one go. Touching the stack at 4K increments is necessary |
| 1022 | // to ensure that the guard pages used by the OS virtual memory manager are |
| 1023 | // allocated in correct sequence. |
| 1024 | if (!isEAXAlive) { |
| 1025 | BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX) |
| 1026 | .addImm(NumBytes); |
| 1027 | BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32)) |
| 1028 | .addExternalSymbol("_alloca"); |
| 1029 | } else { |
| 1030 | // Save EAX |
| 1031 | BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r)) |
| 1032 | .addReg(X86::EAX, RegState::Kill); |
| 1033 | |
| 1034 | // Allocate NumBytes-4 bytes on stack. We'll also use 4 already |
| 1035 | // allocated bytes for EAX. |
| 1036 | BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX) |
| 1037 | .addImm(NumBytes - 4); |
| 1038 | BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32)) |
| 1039 | .addExternalSymbol("_alloca"); |
| 1040 | |
| 1041 | // Restore EAX |
| 1042 | MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm), |
| 1043 | X86::EAX), |
| 1044 | StackPtr, false, NumBytes - 4); |
| 1045 | MBB.insert(MBBI, MI); |
| 1046 | } |
| 1047 | } else if (NumBytes) { |
| 1048 | // If there is an SUB32ri of ESP immediately before this instruction, merge |
| 1049 | // the two. This can be the case when tail call elimination is enabled and |
| 1050 | // the callee has more arguments then the caller. |
| 1051 | NumBytes -= mergeSPUpdates(MBB, MBBI, StackPtr, true); |
| 1052 | |
| 1053 | // If there is an ADD32ri or SUB32ri of ESP immediately after this |
| 1054 | // instruction, merge the two instructions. |
| 1055 | mergeSPUpdatesDown(MBB, MBBI, StackPtr, &NumBytes); |
| 1056 | |
| 1057 | if (NumBytes) |
| 1058 | emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII); |
Evan Cheng | d9245ca | 2006-04-14 07:26:43 +0000 | [diff] [blame] | 1059 | } |
Bill Wendling | d15f45f | 2009-07-09 22:30:02 +0000 | [diff] [blame] | 1060 | |
Bill Wendling | 3bb9b9a | 2009-08-02 22:25:37 +0000 | [diff] [blame] | 1061 | if (!HasFP && needsFrameMoves) { |
Bill Wendling | d15f45f | 2009-07-09 22:30:02 +0000 | [diff] [blame] | 1062 | // Mark end of stack pointer adjustment. |
| 1063 | unsigned LabelId = MMI->NextLabelID(); |
| 1064 | BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId); |
| 1065 | |
| 1066 | // Define the current CFA rule to use the provided offset. |
| 1067 | if (StackSize) { |
| 1068 | MachineLocation SPDst(MachineLocation::VirtualFP); |
| 1069 | MachineLocation SPSrc(MachineLocation::VirtualFP, |
| 1070 | -StackSize + stackGrowth); |
| 1071 | Moves.push_back(MachineMove(LabelId, SPDst, SPSrc)); |
| 1072 | } else { |
| 1073 | // FIXME: Verify & implement for FP |
| 1074 | MachineLocation SPDst(StackPtr); |
| 1075 | MachineLocation SPSrc(StackPtr, stackGrowth); |
| 1076 | Moves.push_back(MachineMove(LabelId, SPDst, SPSrc)); |
| 1077 | } |
| 1078 | } |
Misha Brukman | 2adb395 | 2002-12-04 23:57:03 +0000 | [diff] [blame] | 1079 | } |
| 1080 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 1081 | void X86RegisterInfo::emitEpilogue(MachineFunction &MF, |
| 1082 | MachineBasicBlock &MBB) const { |
Chris Lattner | aa09b75 | 2002-12-28 21:08:28 +0000 | [diff] [blame] | 1083 | const MachineFrameInfo *MFI = MF.getFrameInfo(); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 1084 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
Alkis Evlogimenos | f81af21 | 2004-02-14 01:18:34 +0000 | [diff] [blame] | 1085 | MachineBasicBlock::iterator MBBI = prior(MBB.end()); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 1086 | unsigned RetOpcode = MBBI->getOpcode(); |
Bill Wendling | 2625f9b | 2009-02-21 00:32:08 +0000 | [diff] [blame] | 1087 | DebugLoc DL = MBBI->getDebugLoc(); |
Chris Lattner | 2b3d56e | 2005-05-14 23:35:21 +0000 | [diff] [blame] | 1088 | |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 1089 | switch (RetOpcode) { |
Chris Lattner | 2b3d56e | 2005-05-14 23:35:21 +0000 | [diff] [blame] | 1090 | case X86::RET: |
| 1091 | case X86::RETI: |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1092 | case X86::TCRETURNdi: |
| 1093 | case X86::TCRETURNri: |
| 1094 | case X86::TCRETURNri64: |
| 1095 | case X86::TCRETURNdi64: |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 1096 | case X86::EH_RETURN: |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 1097 | case X86::EH_RETURN64: |
Chris Lattner | 2b3d56e | 2005-05-14 23:35:21 +0000 | [diff] [blame] | 1098 | case X86::TAILJMPd: |
| 1099 | case X86::TAILJMPr: |
| 1100 | case X86::TAILJMPm: break; // These are ok |
| 1101 | default: |
Torok Edwin | c23197a | 2009-07-14 16:55:14 +0000 | [diff] [blame] | 1102 | llvm_unreachable("Can only insert epilog into returning blocks"); |
Chris Lattner | 2b3d56e | 2005-05-14 23:35:21 +0000 | [diff] [blame] | 1103 | } |
Misha Brukman | 2adb395 | 2002-12-04 23:57:03 +0000 | [diff] [blame] | 1104 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 1105 | // Get the number of bytes to allocate from the FrameInfo |
| 1106 | uint64_t StackSize = MFI->getStackSize(); |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1107 | uint64_t MaxAlign = MFI->getMaxAlignment(); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 1108 | unsigned CSSize = X86FI->getCalleeSavedFrameSize(); |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1109 | uint64_t NumBytes = 0; |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 1110 | |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 1111 | if (hasFP(MF)) { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1112 | // Calculate required stack adjustment |
| 1113 | uint64_t FrameSize = StackSize - SlotSize; |
| 1114 | if (needsStackRealignment(MF)) |
| 1115 | FrameSize = (FrameSize + MaxAlign - 1)/MaxAlign*MaxAlign; |
| 1116 | |
| 1117 | NumBytes = FrameSize - CSSize; |
| 1118 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 1119 | // pop EBP. |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1120 | BuildMI(MBB, MBBI, DL, |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1121 | TII.get(Is64Bit ? X86::POP64r : X86::POP32r), FramePtr); |
Bill Wendling | 2625f9b | 2009-02-21 00:32:08 +0000 | [diff] [blame] | 1122 | } else { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1123 | NumBytes = StackSize - CSSize; |
Bill Wendling | 2625f9b | 2009-02-21 00:32:08 +0000 | [diff] [blame] | 1124 | } |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 1125 | |
Evan Cheng | f27795d | 2007-07-17 18:03:34 +0000 | [diff] [blame] | 1126 | // Skip the callee-saved pop instructions. |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1127 | MachineBasicBlock::iterator LastCSPop = MBBI; |
Evan Cheng | f27795d | 2007-07-17 18:03:34 +0000 | [diff] [blame] | 1128 | while (MBBI != MBB.begin()) { |
Evan Cheng | fcc8793 | 2007-07-26 17:45:41 +0000 | [diff] [blame] | 1129 | MachineBasicBlock::iterator PI = prior(MBBI); |
| 1130 | unsigned Opc = PI->getOpcode(); |
Bill Wendling | f7c0940 | 2008-10-31 18:30:19 +0000 | [diff] [blame] | 1131 | if (Opc != X86::POP32r && Opc != X86::POP64r && |
| 1132 | !PI->getDesc().isTerminator()) |
Evan Cheng | f27795d | 2007-07-17 18:03:34 +0000 | [diff] [blame] | 1133 | break; |
| 1134 | --MBBI; |
| 1135 | } |
| 1136 | |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1137 | DL = MBBI->getDebugLoc(); |
| 1138 | |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 1139 | // If there is an ADD32ri or SUB32ri of ESP immediately before this |
| 1140 | // instruction, merge the two instructions. |
| 1141 | if (NumBytes || MFI->hasVarSizedObjects()) |
| 1142 | mergeSPUpdatesUp(MBB, MBBI, StackPtr, &NumBytes); |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 1143 | |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 1144 | // If dynamic alloca is used, then reset esp to point to the last callee-saved |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1145 | // slot before popping them off! Same applies for the case, when stack was |
| 1146 | // realigned |
| 1147 | if (needsStackRealignment(MF)) { |
| 1148 | // We cannot use LEA here, because stack pointer was realigned. We need to |
| 1149 | // deallocate local frame back |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 1150 | if (CSSize) { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1151 | emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII); |
| 1152 | MBBI = prior(LastCSPop); |
| 1153 | } |
| 1154 | |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1155 | BuildMI(MBB, MBBI, DL, |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1156 | TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), |
| 1157 | StackPtr).addReg(FramePtr); |
| 1158 | } else if (MFI->hasVarSizedObjects()) { |
| 1159 | if (CSSize) { |
| 1160 | unsigned Opc = Is64Bit ? X86::LEA64r : X86::LEA32r; |
Rafael Espindola | 094fad3 | 2009-04-08 21:14:34 +0000 | [diff] [blame] | 1161 | MachineInstr *MI = addLeaRegOffset(BuildMI(MF, DL, TII.get(Opc), StackPtr), |
| 1162 | FramePtr, false, -CSSize); |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 1163 | MBB.insert(MBBI, MI); |
| 1164 | } else |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1165 | BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), |
Nate Begeman | beb572b | 2008-07-25 17:34:41 +0000 | [diff] [blame] | 1166 | StackPtr).addReg(FramePtr); |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 1167 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 1168 | } else { |
| 1169 | // adjust stack pointer back: ESP += numbytes |
| 1170 | if (NumBytes) |
| 1171 | emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII); |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 1172 | } |
| 1173 | |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 1174 | // We're returning from function via eh_return. |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 1175 | if (RetOpcode == X86::EH_RETURN || RetOpcode == X86::EH_RETURN64) { |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 1176 | MBBI = prior(MBB.end()); |
| 1177 | MachineOperand &DestAddr = MBBI->getOperand(0); |
Dan Gohman | d735b80 | 2008-10-03 15:45:36 +0000 | [diff] [blame] | 1178 | assert(DestAddr.isReg() && "Offset should be in register!"); |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1179 | BuildMI(MBB, MBBI, DL, |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 1180 | TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), |
| 1181 | StackPtr).addReg(DestAddr.getReg()); |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1182 | // Tail call return: adjust the stack pointer and jump to callee |
| 1183 | } else if (RetOpcode == X86::TCRETURNri || RetOpcode == X86::TCRETURNdi || |
| 1184 | RetOpcode== X86::TCRETURNri64 || RetOpcode == X86::TCRETURNdi64) { |
| 1185 | MBBI = prior(MBB.end()); |
| 1186 | MachineOperand &JumpTarget = MBBI->getOperand(0); |
| 1187 | MachineOperand &StackAdjust = MBBI->getOperand(1); |
Dan Gohman | d735b80 | 2008-10-03 15:45:36 +0000 | [diff] [blame] | 1188 | assert(StackAdjust.isImm() && "Expecting immediate value."); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 1189 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1190 | // Adjust stack pointer. |
| 1191 | int StackAdj = StackAdjust.getImm(); |
| 1192 | int MaxTCDelta = X86FI->getTCReturnAddrDelta(); |
| 1193 | int Offset = 0; |
| 1194 | assert(MaxTCDelta <= 0 && "MaxTCDelta should never be positive"); |
| 1195 | // Incoporate the retaddr area. |
| 1196 | Offset = StackAdj-MaxTCDelta; |
| 1197 | assert(Offset >= 0 && "Offset should never be negative"); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1198 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1199 | if (Offset) { |
| 1200 | // Check for possible merge with preceeding ADD instruction. |
| 1201 | Offset += mergeSPUpdates(MBB, MBBI, StackPtr, true); |
| 1202 | emitSPUpdate(MBB, MBBI, StackPtr, Offset, Is64Bit, TII); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 1203 | } |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1204 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1205 | // Jump to label or value in register. |
| 1206 | if (RetOpcode == X86::TCRETURNdi|| RetOpcode == X86::TCRETURNdi64) |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1207 | BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPd)). |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1208 | addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset()); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1209 | else if (RetOpcode== X86::TCRETURNri64) |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1210 | BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr64), JumpTarget.getReg()); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1211 | else |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1212 | BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr), JumpTarget.getReg()); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1213 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1214 | // Delete the pseudo instruction TCRETURN. |
| 1215 | MBB.erase(MBBI); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 1216 | } else if ((RetOpcode == X86::RET || RetOpcode == X86::RETI) && |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1217 | (X86FI->getTCReturnAddrDelta() < 0)) { |
| 1218 | // Add the return addr area delta back since we are not tail calling. |
| 1219 | int delta = -1*X86FI->getTCReturnAddrDelta(); |
| 1220 | MBBI = prior(MBB.end()); |
| 1221 | // Check for possible merge with preceeding ADD instruction. |
| 1222 | delta += mergeSPUpdates(MBB, MBBI, StackPtr, true); |
| 1223 | emitSPUpdate(MBB, MBBI, StackPtr, delta, Is64Bit, TII); |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 1224 | } |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 1225 | } |
| 1226 | |
Jim Laskey | 4188699 | 2006-04-07 16:34:46 +0000 | [diff] [blame] | 1227 | unsigned X86RegisterInfo::getRARegister() const { |
Anton Korobeynikov | 038082d | 2007-05-02 08:46:03 +0000 | [diff] [blame] | 1228 | if (Is64Bit) |
| 1229 | return X86::RIP; // Should have dwarf #16 |
| 1230 | else |
| 1231 | return X86::EIP; // Should have dwarf #8 |
Jim Laskey | 4188699 | 2006-04-07 16:34:46 +0000 | [diff] [blame] | 1232 | } |
| 1233 | |
Jim Laskey | a997918 | 2006-03-28 13:48:33 +0000 | [diff] [blame] | 1234 | unsigned X86RegisterInfo::getFrameRegister(MachineFunction &MF) const { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1235 | return hasFP(MF) ? FramePtr : StackPtr; |
Jim Laskey | f1d78e8 | 2006-03-23 18:12:57 +0000 | [diff] [blame] | 1236 | } |
| 1237 | |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1238 | void X86RegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) |
| 1239 | const { |
Anton Korobeynikov | 0ff3ca4 | 2007-05-12 22:36:25 +0000 | [diff] [blame] | 1240 | // Calculate amount of bytes used for return address storing |
| 1241 | int stackGrowth = (Is64Bit ? -8 : -4); |
| 1242 | |
| 1243 | // Initial state of the frame pointer is esp+4. |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1244 | MachineLocation Dst(MachineLocation::VirtualFP); |
Anton Korobeynikov | 0ff3ca4 | 2007-05-12 22:36:25 +0000 | [diff] [blame] | 1245 | MachineLocation Src(StackPtr, stackGrowth); |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1246 | Moves.push_back(MachineMove(0, Dst, Src)); |
Anton Korobeynikov | 0ff3ca4 | 2007-05-12 22:36:25 +0000 | [diff] [blame] | 1247 | |
| 1248 | // Add return address to move list |
| 1249 | MachineLocation CSDst(StackPtr, stackGrowth); |
| 1250 | MachineLocation CSSrc(getRARegister()); |
| 1251 | Moves.push_back(MachineMove(0, CSDst, CSSrc)); |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1252 | } |
| 1253 | |
Jim Laskey | 62819f3 | 2007-02-21 22:54:50 +0000 | [diff] [blame] | 1254 | unsigned X86RegisterInfo::getEHExceptionRegister() const { |
Torok Edwin | c23197a | 2009-07-14 16:55:14 +0000 | [diff] [blame] | 1255 | llvm_unreachable("What is the exception register"); |
Jim Laskey | 62819f3 | 2007-02-21 22:54:50 +0000 | [diff] [blame] | 1256 | return 0; |
| 1257 | } |
| 1258 | |
| 1259 | unsigned X86RegisterInfo::getEHHandlerRegister() const { |
Torok Edwin | c23197a | 2009-07-14 16:55:14 +0000 | [diff] [blame] | 1260 | llvm_unreachable("What is the exception handler register"); |
Jim Laskey | 62819f3 | 2007-02-21 22:54:50 +0000 | [diff] [blame] | 1261 | return 0; |
| 1262 | } |
| 1263 | |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1264 | namespace llvm { |
Duncan Sands | 83ec4b6 | 2008-06-06 12:08:01 +0000 | [diff] [blame] | 1265 | unsigned getX86SubSuperRegister(unsigned Reg, MVT VT, bool High) { |
| 1266 | switch (VT.getSimpleVT()) { |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1267 | default: return Reg; |
| 1268 | case MVT::i8: |
| 1269 | if (High) { |
| 1270 | switch (Reg) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1271 | default: return 0; |
| 1272 | case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1273 | return X86::AH; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1274 | case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1275 | return X86::DH; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1276 | case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1277 | return X86::CH; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1278 | case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1279 | return X86::BH; |
| 1280 | } |
| 1281 | } else { |
| 1282 | switch (Reg) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1283 | default: return 0; |
| 1284 | case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1285 | return X86::AL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1286 | case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1287 | return X86::DL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1288 | case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1289 | return X86::CL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1290 | case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1291 | return X86::BL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1292 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
| 1293 | return X86::SIL; |
| 1294 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
| 1295 | return X86::DIL; |
| 1296 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
| 1297 | return X86::BPL; |
| 1298 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
| 1299 | return X86::SPL; |
| 1300 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1301 | return X86::R8B; |
| 1302 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1303 | return X86::R9B; |
| 1304 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1305 | return X86::R10B; |
| 1306 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1307 | return X86::R11B; |
| 1308 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1309 | return X86::R12B; |
| 1310 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1311 | return X86::R13B; |
| 1312 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1313 | return X86::R14B; |
| 1314 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1315 | return X86::R15B; |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1316 | } |
| 1317 | } |
| 1318 | case MVT::i16: |
| 1319 | switch (Reg) { |
| 1320 | default: return Reg; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1321 | case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1322 | return X86::AX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1323 | case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1324 | return X86::DX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1325 | case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1326 | return X86::CX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1327 | case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1328 | return X86::BX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1329 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1330 | return X86::SI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1331 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1332 | return X86::DI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1333 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1334 | return X86::BP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1335 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1336 | return X86::SP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1337 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1338 | return X86::R8W; |
| 1339 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1340 | return X86::R9W; |
| 1341 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1342 | return X86::R10W; |
| 1343 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1344 | return X86::R11W; |
| 1345 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1346 | return X86::R12W; |
| 1347 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1348 | return X86::R13W; |
| 1349 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1350 | return X86::R14W; |
| 1351 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1352 | return X86::R15W; |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1353 | } |
| 1354 | case MVT::i32: |
| 1355 | switch (Reg) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1356 | default: return Reg; |
| 1357 | case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1358 | return X86::EAX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1359 | case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1360 | return X86::EDX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1361 | case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1362 | return X86::ECX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1363 | case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1364 | return X86::EBX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1365 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1366 | return X86::ESI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1367 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1368 | return X86::EDI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1369 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1370 | return X86::EBP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1371 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1372 | return X86::ESP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1373 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1374 | return X86::R8D; |
| 1375 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1376 | return X86::R9D; |
| 1377 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1378 | return X86::R10D; |
| 1379 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1380 | return X86::R11D; |
| 1381 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1382 | return X86::R12D; |
| 1383 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1384 | return X86::R13D; |
| 1385 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1386 | return X86::R14D; |
| 1387 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1388 | return X86::R15D; |
| 1389 | } |
| 1390 | case MVT::i64: |
| 1391 | switch (Reg) { |
| 1392 | default: return Reg; |
| 1393 | case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: |
| 1394 | return X86::RAX; |
| 1395 | case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX: |
| 1396 | return X86::RDX; |
| 1397 | case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX: |
| 1398 | return X86::RCX; |
| 1399 | case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX: |
| 1400 | return X86::RBX; |
| 1401 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
| 1402 | return X86::RSI; |
| 1403 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
| 1404 | return X86::RDI; |
| 1405 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
| 1406 | return X86::RBP; |
| 1407 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
| 1408 | return X86::RSP; |
| 1409 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1410 | return X86::R8; |
| 1411 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1412 | return X86::R9; |
| 1413 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1414 | return X86::R10; |
| 1415 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1416 | return X86::R11; |
| 1417 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1418 | return X86::R12; |
| 1419 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1420 | return X86::R13; |
| 1421 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1422 | return X86::R14; |
| 1423 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1424 | return X86::R15; |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1425 | } |
| 1426 | } |
| 1427 | |
| 1428 | return Reg; |
| 1429 | } |
| 1430 | } |
| 1431 | |
Chris Lattner | 7ad3e06 | 2003-08-03 15:48:14 +0000 | [diff] [blame] | 1432 | #include "X86GenRegisterInfo.inc" |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1433 | |
| 1434 | namespace { |
| 1435 | struct VISIBILITY_HIDDEN MSAC : public MachineFunctionPass { |
| 1436 | static char ID; |
Dan Gohman | ae73dc1 | 2008-09-04 17:05:41 +0000 | [diff] [blame] | 1437 | MSAC() : MachineFunctionPass(&ID) {} |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1438 | |
| 1439 | virtual bool runOnMachineFunction(MachineFunction &MF) { |
| 1440 | MachineFrameInfo *FFI = MF.getFrameInfo(); |
Anton Korobeynikov | d52bdaf | 2008-04-23 18:23:30 +0000 | [diff] [blame] | 1441 | MachineRegisterInfo &RI = MF.getRegInfo(); |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1442 | |
Anton Korobeynikov | d52bdaf | 2008-04-23 18:23:30 +0000 | [diff] [blame] | 1443 | // Calculate max stack alignment of all already allocated stack objects. |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1444 | unsigned MaxAlign = calculateMaxStackAlignment(FFI); |
| 1445 | |
Anton Korobeynikov | d52bdaf | 2008-04-23 18:23:30 +0000 | [diff] [blame] | 1446 | // Be over-conservative: scan over all vreg defs and find, whether vector |
| 1447 | // registers are used. If yes - there is probability, that vector register |
| 1448 | // will be spilled and thus stack needs to be aligned properly. |
| 1449 | for (unsigned RegNum = TargetRegisterInfo::FirstVirtualRegister; |
| 1450 | RegNum < RI.getLastVirtReg(); ++RegNum) |
| 1451 | MaxAlign = std::max(MaxAlign, RI.getRegClass(RegNum)->getAlignment()); |
| 1452 | |
Dan Gohman | 92aa404 | 2009-08-01 00:31:02 +0000 | [diff] [blame] | 1453 | if (FFI->getMaxAlignment() == MaxAlign) |
| 1454 | return false; |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1455 | |
Dan Gohman | 92aa404 | 2009-08-01 00:31:02 +0000 | [diff] [blame] | 1456 | FFI->setMaxAlignment(MaxAlign); |
| 1457 | return true; |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1458 | } |
| 1459 | |
| 1460 | virtual const char *getPassName() const { |
| 1461 | return "X86 Maximal Stack Alignment Calculator"; |
| 1462 | } |
Dan Gohman | 92aa404 | 2009-08-01 00:31:02 +0000 | [diff] [blame] | 1463 | |
| 1464 | virtual void getAnalysisUsage(AnalysisUsage &AU) const { |
| 1465 | AU.setPreservesCFG(); |
| 1466 | MachineFunctionPass::getAnalysisUsage(AU); |
| 1467 | } |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1468 | }; |
| 1469 | |
| 1470 | char MSAC::ID = 0; |
| 1471 | } |
| 1472 | |
| 1473 | FunctionPass* |
| 1474 | llvm::createX86MaxStackAlignmentCalculatorPass() { return new MSAC(); } |