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" |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 40 | #include "llvm/Support/Compiler.h" |
Chris Lattner | 300d0ed | 2004-02-14 06:00:36 +0000 | [diff] [blame] | 41 | using namespace llvm; |
Brian Gaeke | d0fde30 | 2003-11-11 22:41:34 +0000 | [diff] [blame] | 42 | |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 43 | X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm, |
| 44 | const TargetInstrInfo &tii) |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 45 | : X86GenRegisterInfo(tm.getSubtarget<X86Subtarget>().is64Bit() ? |
| 46 | X86::ADJCALLSTACKDOWN64 : |
| 47 | X86::ADJCALLSTACKDOWN32, |
| 48 | tm.getSubtarget<X86Subtarget>().is64Bit() ? |
| 49 | X86::ADJCALLSTACKUP64 : |
| 50 | X86::ADJCALLSTACKUP32), |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 51 | TM(tm), TII(tii) { |
| 52 | // Cache some information. |
| 53 | const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>(); |
| 54 | Is64Bit = Subtarget->is64Bit(); |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 55 | IsWin64 = Subtarget->isTargetWin64(); |
Evan Cheng | db807ed | 2007-11-05 07:30:01 +0000 | [diff] [blame] | 56 | StackAlign = TM.getFrameInfo()->getStackAlignment(); |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 57 | if (Is64Bit) { |
| 58 | SlotSize = 8; |
| 59 | StackPtr = X86::RSP; |
| 60 | FramePtr = X86::RBP; |
| 61 | } else { |
| 62 | SlotSize = 4; |
| 63 | StackPtr = X86::ESP; |
| 64 | FramePtr = X86::EBP; |
| 65 | } |
| 66 | } |
Chris Lattner | 7ad3e06 | 2003-08-03 15:48:14 +0000 | [diff] [blame] | 67 | |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 68 | // getDwarfRegNum - This function maps LLVM register identifiers to the |
| 69 | // Dwarf specific numbering, used in debug info and exception tables. |
Dale Johannesen | 4542edc | 2007-11-07 21:48:35 +0000 | [diff] [blame] | 70 | |
Dale Johannesen | b97aec6 | 2007-11-13 19:13:01 +0000 | [diff] [blame] | 71 | int X86RegisterInfo::getDwarfRegNum(unsigned RegNo, bool isEH) const { |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 72 | const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>(); |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 73 | unsigned Flavour = DWARFFlavour::X86_64; |
Dale Johannesen | 7a42f24 | 2007-11-09 18:07:11 +0000 | [diff] [blame] | 74 | if (!Subtarget->is64Bit()) { |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 75 | if (Subtarget->isTargetDarwin()) { |
Anton Korobeynikov | 8eea339 | 2008-01-25 00:34:13 +0000 | [diff] [blame] | 76 | if (isEH) |
| 77 | Flavour = DWARFFlavour::X86_32_DarwinEH; |
| 78 | else |
| 79 | Flavour = DWARFFlavour::X86_32_Generic; |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 80 | } else if (Subtarget->isTargetCygMing()) { |
| 81 | // Unsupported by now, just quick fallback |
Anton Korobeynikov | 8eea339 | 2008-01-25 00:34:13 +0000 | [diff] [blame] | 82 | Flavour = DWARFFlavour::X86_32_Generic; |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 83 | } else { |
Anton Korobeynikov | 8eea339 | 2008-01-25 00:34:13 +0000 | [diff] [blame] | 84 | Flavour = DWARFFlavour::X86_32_Generic; |
Dale Johannesen | 7a42f24 | 2007-11-09 18:07:11 +0000 | [diff] [blame] | 85 | } |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 86 | } |
Anton Korobeynikov | f191c80 | 2007-11-11 19:50:10 +0000 | [diff] [blame] | 87 | |
| 88 | return X86GenRegisterInfo::getDwarfRegNumFull(RegNo, Flavour); |
Dale Johannesen | 483ec21 | 2007-11-07 00:25:05 +0000 | [diff] [blame] | 89 | } |
| 90 | |
Duncan Sands | ee46574 | 2007-08-29 19:01:20 +0000 | [diff] [blame] | 91 | // getX86RegNum - This function maps LLVM register identifiers to their X86 |
| 92 | // specific numbering, which is used in various places encoding instructions. |
| 93 | // |
Nicolas Geoffray | 52e724a | 2008-04-16 20:10:13 +0000 | [diff] [blame] | 94 | unsigned X86RegisterInfo::getX86RegNum(unsigned RegNo) { |
Duncan Sands | ee46574 | 2007-08-29 19:01:20 +0000 | [diff] [blame] | 95 | switch(RegNo) { |
| 96 | case X86::RAX: case X86::EAX: case X86::AX: case X86::AL: return N86::EAX; |
| 97 | case X86::RCX: case X86::ECX: case X86::CX: case X86::CL: return N86::ECX; |
| 98 | case X86::RDX: case X86::EDX: case X86::DX: case X86::DL: return N86::EDX; |
| 99 | case X86::RBX: case X86::EBX: case X86::BX: case X86::BL: return N86::EBX; |
| 100 | case X86::RSP: case X86::ESP: case X86::SP: case X86::SPL: case X86::AH: |
| 101 | return N86::ESP; |
| 102 | case X86::RBP: case X86::EBP: case X86::BP: case X86::BPL: case X86::CH: |
| 103 | return N86::EBP; |
| 104 | case X86::RSI: case X86::ESI: case X86::SI: case X86::SIL: case X86::DH: |
| 105 | return N86::ESI; |
| 106 | case X86::RDI: case X86::EDI: case X86::DI: case X86::DIL: case X86::BH: |
| 107 | return N86::EDI; |
| 108 | |
| 109 | case X86::R8: case X86::R8D: case X86::R8W: case X86::R8B: |
| 110 | return N86::EAX; |
| 111 | case X86::R9: case X86::R9D: case X86::R9W: case X86::R9B: |
| 112 | return N86::ECX; |
| 113 | case X86::R10: case X86::R10D: case X86::R10W: case X86::R10B: |
| 114 | return N86::EDX; |
| 115 | case X86::R11: case X86::R11D: case X86::R11W: case X86::R11B: |
| 116 | return N86::EBX; |
| 117 | case X86::R12: case X86::R12D: case X86::R12W: case X86::R12B: |
| 118 | return N86::ESP; |
| 119 | case X86::R13: case X86::R13D: case X86::R13W: case X86::R13B: |
| 120 | return N86::EBP; |
| 121 | case X86::R14: case X86::R14D: case X86::R14W: case X86::R14B: |
| 122 | return N86::ESI; |
| 123 | case X86::R15: case X86::R15D: case X86::R15W: case X86::R15B: |
| 124 | return N86::EDI; |
| 125 | |
| 126 | case X86::ST0: case X86::ST1: case X86::ST2: case X86::ST3: |
| 127 | case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7: |
| 128 | return RegNo-X86::ST0; |
| 129 | |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 130 | case X86::XMM0: case X86::XMM8: case X86::MM0: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 131 | return 0; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 132 | case X86::XMM1: case X86::XMM9: case X86::MM1: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 133 | return 1; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 134 | case X86::XMM2: case X86::XMM10: case X86::MM2: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 135 | return 2; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 136 | case X86::XMM3: case X86::XMM11: case X86::MM3: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 137 | return 3; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 138 | case X86::XMM4: case X86::XMM12: case X86::MM4: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 139 | return 4; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 140 | case X86::XMM5: case X86::XMM13: case X86::MM5: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 141 | return 5; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 142 | case X86::XMM6: case X86::XMM14: case X86::MM6: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 143 | return 6; |
Nate Begeman | 6e041c2 | 2007-12-11 18:06:14 +0000 | [diff] [blame] | 144 | case X86::XMM7: case X86::XMM15: case X86::MM7: |
Evan Cheng | e7c8754 | 2007-11-13 17:54:34 +0000 | [diff] [blame] | 145 | return 7; |
Duncan Sands | ee46574 | 2007-08-29 19:01:20 +0000 | [diff] [blame] | 146 | |
| 147 | default: |
| 148 | assert(isVirtualRegister(RegNo) && "Unknown physical register!"); |
| 149 | assert(0 && "Register allocator hasn't allocated reg correctly yet!"); |
| 150 | return 0; |
| 151 | } |
| 152 | } |
| 153 | |
Evan Cheng | 770bcc7 | 2009-02-06 17:43:24 +0000 | [diff] [blame] | 154 | const TargetRegisterClass *X86RegisterInfo::getPointerRegClass() const { |
| 155 | const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>(); |
| 156 | if (Subtarget->is64Bit()) |
| 157 | return &X86::GR64RegClass; |
| 158 | else |
| 159 | return &X86::GR32RegClass; |
| 160 | } |
| 161 | |
Evan Cheng | ff11026 | 2007-09-26 21:31:07 +0000 | [diff] [blame] | 162 | const TargetRegisterClass * |
| 163 | X86RegisterInfo::getCrossCopyRegClass(const TargetRegisterClass *RC) const { |
Anton Korobeynikov | 4aefd6b | 2008-02-20 12:07:57 +0000 | [diff] [blame] | 164 | if (RC == &X86::CCRRegClass) { |
Evan Cheng | 3f2d9ec | 2007-09-27 21:50:05 +0000 | [diff] [blame] | 165 | if (Is64Bit) |
| 166 | return &X86::GR64RegClass; |
| 167 | else |
| 168 | return &X86::GR32RegClass; |
Anton Korobeynikov | 4aefd6b | 2008-02-20 12:07:57 +0000 | [diff] [blame] | 169 | } |
Evan Cheng | ff11026 | 2007-09-26 21:31:07 +0000 | [diff] [blame] | 170 | return NULL; |
| 171 | } |
Evan Cheng | bf2c8b3 | 2007-03-20 08:09:38 +0000 | [diff] [blame] | 172 | |
Evan Cheng | 64d80e3 | 2007-07-19 01:14:50 +0000 | [diff] [blame] | 173 | const unsigned * |
| 174 | X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 175 | bool callsEHReturn = false; |
| 176 | |
| 177 | if (MF) { |
| 178 | const MachineFrameInfo *MFI = MF->getFrameInfo(); |
| 179 | const MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
| 180 | callsEHReturn = (MMI ? MMI->callsEHReturn() : false); |
| 181 | } |
| 182 | |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 183 | static const unsigned CalleeSavedRegs32Bit[] = { |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 184 | X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0 |
| 185 | }; |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 186 | |
| 187 | static const unsigned CalleeSavedRegs32EHRet[] = { |
| 188 | X86::EAX, X86::EDX, X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0 |
| 189 | }; |
| 190 | |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 191 | static const unsigned CalleeSavedRegs64Bit[] = { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 192 | X86::RBX, X86::R12, X86::R13, X86::R14, X86::R15, X86::RBP, 0 |
| 193 | }; |
| 194 | |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 195 | static const unsigned CalleeSavedRegs64EHRet[] = { |
| 196 | X86::RAX, X86::RDX, X86::RBX, X86::R12, |
| 197 | X86::R13, X86::R14, X86::R15, X86::RBP, 0 |
| 198 | }; |
| 199 | |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 200 | static const unsigned CalleeSavedRegsWin64[] = { |
Anton Korobeynikov | 5979d71 | 2008-09-24 22:03:04 +0000 | [diff] [blame] | 201 | X86::RBX, X86::RBP, X86::RDI, X86::RSI, |
| 202 | X86::R12, X86::R13, X86::R14, X86::R15, |
| 203 | X86::XMM6, X86::XMM7, X86::XMM8, X86::XMM9, |
| 204 | X86::XMM10, X86::XMM11, X86::XMM12, X86::XMM13, |
| 205 | X86::XMM14, X86::XMM15, 0 |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 206 | }; |
| 207 | |
| 208 | if (Is64Bit) { |
| 209 | if (IsWin64) |
| 210 | return CalleeSavedRegsWin64; |
| 211 | else |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 212 | return (callsEHReturn ? CalleeSavedRegs64EHRet : CalleeSavedRegs64Bit); |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 213 | } else { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 214 | return (callsEHReturn ? CalleeSavedRegs32EHRet : CalleeSavedRegs32Bit); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 215 | } |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | const TargetRegisterClass* const* |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 219 | X86RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 220 | bool callsEHReturn = false; |
| 221 | |
| 222 | if (MF) { |
| 223 | const MachineFrameInfo *MFI = MF->getFrameInfo(); |
| 224 | const MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
| 225 | callsEHReturn = (MMI ? MMI->callsEHReturn() : false); |
| 226 | } |
| 227 | |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 228 | static const TargetRegisterClass * const CalleeSavedRegClasses32Bit[] = { |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 229 | &X86::GR32RegClass, &X86::GR32RegClass, |
| 230 | &X86::GR32RegClass, &X86::GR32RegClass, 0 |
| 231 | }; |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 232 | static const TargetRegisterClass * const CalleeSavedRegClasses32EHRet[] = { |
| 233 | &X86::GR32RegClass, &X86::GR32RegClass, |
| 234 | &X86::GR32RegClass, &X86::GR32RegClass, |
| 235 | &X86::GR32RegClass, &X86::GR32RegClass, 0 |
| 236 | }; |
Evan Cheng | c2b861d | 2007-01-02 21:33:40 +0000 | [diff] [blame] | 237 | static const TargetRegisterClass * const CalleeSavedRegClasses64Bit[] = { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 238 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 239 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 240 | &X86::GR64RegClass, &X86::GR64RegClass, 0 |
| 241 | }; |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 242 | static const TargetRegisterClass * const CalleeSavedRegClasses64EHRet[] = { |
| 243 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 244 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 245 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 246 | &X86::GR64RegClass, &X86::GR64RegClass, 0 |
| 247 | }; |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 248 | static const TargetRegisterClass * const CalleeSavedRegClassesWin64[] = { |
Anton Korobeynikov | 5979d71 | 2008-09-24 22:03:04 +0000 | [diff] [blame] | 249 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 250 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 251 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 252 | &X86::GR64RegClass, &X86::GR64RegClass, |
| 253 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 254 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 255 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 256 | &X86::VR128RegClass, &X86::VR128RegClass, |
| 257 | &X86::VR128RegClass, &X86::VR128RegClass, 0 |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 258 | }; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 259 | |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 260 | if (Is64Bit) { |
| 261 | if (IsWin64) |
| 262 | return CalleeSavedRegClassesWin64; |
| 263 | else |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 264 | return (callsEHReturn ? |
| 265 | CalleeSavedRegClasses64EHRet : CalleeSavedRegClasses64Bit); |
Anton Korobeynikov | 1dcce21 | 2008-03-22 21:04:01 +0000 | [diff] [blame] | 266 | } else { |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 267 | return (callsEHReturn ? |
| 268 | CalleeSavedRegClasses32EHRet : CalleeSavedRegClasses32Bit); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 269 | } |
Evan Cheng | 0f3ac8d | 2006-05-18 00:12:58 +0000 | [diff] [blame] | 270 | } |
| 271 | |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 272 | BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const { |
| 273 | BitVector Reserved(getNumRegs()); |
Dan Gohman | a32b7ac | 2008-12-18 01:05:09 +0000 | [diff] [blame] | 274 | // Set the stack-pointer register and its aliases as reserved. |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 275 | Reserved.set(X86::RSP); |
| 276 | Reserved.set(X86::ESP); |
| 277 | Reserved.set(X86::SP); |
| 278 | Reserved.set(X86::SPL); |
Dan Gohman | a32b7ac | 2008-12-18 01:05:09 +0000 | [diff] [blame] | 279 | // Set the frame-pointer register and its aliases as reserved if needed. |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 280 | if (hasFP(MF)) { |
| 281 | Reserved.set(X86::RBP); |
| 282 | Reserved.set(X86::EBP); |
| 283 | Reserved.set(X86::BP); |
| 284 | Reserved.set(X86::BPL); |
| 285 | } |
Dan Gohman | a32b7ac | 2008-12-18 01:05:09 +0000 | [diff] [blame] | 286 | // Mark the x87 stack registers as reserved, since they don't |
| 287 | // behave normally with respect to liveness. We don't fully |
| 288 | // model the effects of x87 stack pushes and pops after |
| 289 | // stackification. |
| 290 | Reserved.set(X86::ST0); |
| 291 | Reserved.set(X86::ST1); |
| 292 | Reserved.set(X86::ST2); |
| 293 | Reserved.set(X86::ST3); |
| 294 | Reserved.set(X86::ST4); |
| 295 | Reserved.set(X86::ST5); |
| 296 | Reserved.set(X86::ST6); |
| 297 | Reserved.set(X86::ST7); |
Evan Cheng | b371f45 | 2007-02-19 21:49:54 +0000 | [diff] [blame] | 298 | return Reserved; |
| 299 | } |
| 300 | |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 301 | //===----------------------------------------------------------------------===// |
| 302 | // Stack Frame Processing methods |
| 303 | //===----------------------------------------------------------------------===// |
| 304 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 305 | static unsigned calculateMaxStackAlignment(const MachineFrameInfo *FFI) { |
| 306 | unsigned MaxAlign = 0; |
| 307 | for (int i = FFI->getObjectIndexBegin(), |
| 308 | e = FFI->getObjectIndexEnd(); i != e; ++i) { |
| 309 | if (FFI->isDeadObjectIndex(i)) |
| 310 | continue; |
| 311 | unsigned Align = FFI->getObjectAlignment(i); |
| 312 | MaxAlign = std::max(MaxAlign, Align); |
| 313 | } |
| 314 | |
| 315 | return MaxAlign; |
| 316 | } |
| 317 | |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 318 | // hasFP - Return true if the specified function should have a dedicated frame |
| 319 | // pointer register. This is true if the function has variable sized allocas or |
| 320 | // if frame pointer elimination is disabled. |
| 321 | // |
Evan Cheng | dc77540 | 2007-01-23 00:57:47 +0000 | [diff] [blame] | 322 | bool X86RegisterInfo::hasFP(const MachineFunction &MF) const { |
Dan Gohman | 8e5f2c6 | 2008-07-07 23:14:23 +0000 | [diff] [blame] | 323 | const MachineFrameInfo *MFI = MF.getFrameInfo(); |
| 324 | const MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 325 | |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 326 | return (NoFramePointerElim || |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 327 | needsStackRealignment(MF) || |
Evan Cheng | 7e7bbf8 | 2007-07-19 00:42:05 +0000 | [diff] [blame] | 328 | MFI->hasVarSizedObjects() || |
Evan Cheng | 184793f | 2008-09-27 01:56:22 +0000 | [diff] [blame] | 329 | MFI->isFrameAddressTaken() || |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 330 | MF.getInfo<X86MachineFunctionInfo>()->getForceFramePointer() || |
| 331 | (MMI && MMI->callsUnwindInit())); |
Misha Brukman | 03c6faf | 2002-12-03 23:11:21 +0000 | [diff] [blame] | 332 | } |
Misha Brukman | 2adb395 | 2002-12-04 23:57:03 +0000 | [diff] [blame] | 333 | |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 334 | bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const { |
Nick Lewycky | 9c0f146 | 2009-03-19 05:51:39 +0000 | [diff] [blame] | 335 | const MachineFrameInfo *MFI = MF.getFrameInfo(); |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 336 | |
Anton Korobeynikov | 35410a4 | 2008-04-23 18:16:43 +0000 | [diff] [blame] | 337 | // FIXME: Currently we don't support stack realignment for functions with |
| 338 | // variable-sized allocas |
Anton Korobeynikov | 941ff58 | 2008-04-23 18:24:25 +0000 | [diff] [blame] | 339 | return (RealignStack && |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 340 | (MFI->getMaxAlignment() > StackAlign && |
Anton Korobeynikov | cfcd20e | 2008-04-23 18:17:11 +0000 | [diff] [blame] | 341 | !MFI->hasVarSizedObjects())); |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 342 | } |
| 343 | |
Evan Cheng | 7e7bbf8 | 2007-07-19 00:42:05 +0000 | [diff] [blame] | 344 | bool X86RegisterInfo::hasReservedCallFrame(MachineFunction &MF) const { |
| 345 | return !MF.getFrameInfo()->hasVarSizedObjects(); |
| 346 | } |
| 347 | |
Anton Korobeynikov | 82751e3 | 2008-04-23 18:18:36 +0000 | [diff] [blame] | 348 | int |
| 349 | X86RegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const { |
| 350 | int Offset = MF.getFrameInfo()->getObjectOffset(FI) + SlotSize; |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 351 | uint64_t StackSize = MF.getFrameInfo()->getStackSize(); |
Anton Korobeynikov | 82751e3 | 2008-04-23 18:18:36 +0000 | [diff] [blame] | 352 | |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 353 | if (needsStackRealignment(MF)) { |
| 354 | if (FI < 0) |
| 355 | // Skip the saved EBP |
| 356 | Offset += SlotSize; |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 357 | else { |
Dale Johannesen | b5dae00 | 2008-06-26 01:51:13 +0000 | [diff] [blame] | 358 | unsigned Align = MF.getFrameInfo()->getObjectAlignment(FI); |
| 359 | assert( (-(Offset + StackSize)) % Align == 0); |
Devang Patel | fd1c6c3 | 2008-12-23 21:56:28 +0000 | [diff] [blame] | 360 | Align = 0; |
Dale Johannesen | b5dae00 | 2008-06-26 01:51:13 +0000 | [diff] [blame] | 361 | return Offset + StackSize; |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 362 | } |
Anton Korobeynikov | d1c133a | 2008-04-23 18:19:23 +0000 | [diff] [blame] | 363 | |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 364 | // FIXME: Support tail calls |
| 365 | } else { |
| 366 | if (!hasFP(MF)) |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 367 | return Offset + StackSize; |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 368 | |
| 369 | // Skip the saved EBP |
| 370 | Offset += SlotSize; |
| 371 | |
| 372 | // Skip the RETADDR move area |
| 373 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
| 374 | int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); |
| 375 | if (TailCallReturnAddrDelta < 0) Offset -= TailCallReturnAddrDelta; |
| 376 | } |
| 377 | |
Anton Korobeynikov | 82751e3 | 2008-04-23 18:18:36 +0000 | [diff] [blame] | 378 | return Offset; |
| 379 | } |
| 380 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 381 | void X86RegisterInfo:: |
| 382 | eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB, |
| 383 | MachineBasicBlock::iterator I) const { |
Evan Cheng | 7e7bbf8 | 2007-07-19 00:42:05 +0000 | [diff] [blame] | 384 | if (!hasReservedCallFrame(MF)) { |
| 385 | // If the stack pointer can be changed after prologue, turn the |
| 386 | // adjcallstackup instruction into a 'sub ESP, <amt>' and the |
| 387 | // adjcallstackdown instruction into 'add ESP, <amt>' |
| 388 | // TODO: consider using push / pop instead of sub + store / add |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 389 | MachineInstr *Old = I; |
Chris Lattner | 6180780 | 2007-04-25 04:25:10 +0000 | [diff] [blame] | 390 | uint64_t Amount = Old->getOperand(0).getImm(); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 391 | if (Amount != 0) { |
Chris Lattner | f158da2 | 2003-01-16 02:20:12 +0000 | [diff] [blame] | 392 | // We need to keep the stack aligned properly. To do this, we round the |
| 393 | // amount of space needed for the outgoing arguments up to the next |
| 394 | // alignment boundary. |
Evan Cheng | db807ed | 2007-11-05 07:30:01 +0000 | [diff] [blame] | 395 | Amount = (Amount+StackAlign-1)/StackAlign*StackAlign; |
Chris Lattner | f158da2 | 2003-01-16 02:20:12 +0000 | [diff] [blame] | 396 | |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 397 | MachineInstr *New = 0; |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 398 | if (Old->getOpcode() == getCallFrameSetupOpcode()) { |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 399 | New = BuildMI(MF, Old->getDebugLoc(), |
| 400 | TII.get(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri), |
Evan Cheng | bdf7b5d | 2008-08-25 21:58:43 +0000 | [diff] [blame] | 401 | StackPtr).addReg(StackPtr).addImm(Amount); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 402 | } else { |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 403 | assert(Old->getOpcode() == getCallFrameDestroyOpcode()); |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 404 | // factor out the amount the callee already popped. |
Chris Lattner | 6180780 | 2007-04-25 04:25:10 +0000 | [diff] [blame] | 405 | uint64_t CalleeAmt = Old->getOperand(1).getImm(); |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 406 | Amount -= CalleeAmt; |
Chris Lattner | d77525d | 2006-02-03 18:20:04 +0000 | [diff] [blame] | 407 | if (Amount) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 408 | unsigned Opc = (Amount < 128) ? |
| 409 | (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) : |
| 410 | (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri); |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 411 | New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr) |
Evan Cheng | bdf7b5d | 2008-08-25 21:58:43 +0000 | [diff] [blame] | 412 | .addReg(StackPtr).addImm(Amount); |
Chris Lattner | d77525d | 2006-02-03 18:20:04 +0000 | [diff] [blame] | 413 | } |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 414 | } |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 415 | |
Dan Gohman | d293e0d | 2009-02-11 19:50:24 +0000 | [diff] [blame] | 416 | if (New) { |
| 417 | // The EFLAGS implicit def is dead. |
| 418 | New->getOperand(3).setIsDead(); |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 419 | |
Dan Gohman | d293e0d | 2009-02-11 19:50:24 +0000 | [diff] [blame] | 420 | // Replace the pseudo instruction with a new instruction... |
| 421 | MBB.insert(I, New); |
| 422 | } |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 423 | } |
Dan Gohman | 6d4b052 | 2008-10-01 18:28:06 +0000 | [diff] [blame] | 424 | } else if (I->getOpcode() == getCallFrameDestroyOpcode()) { |
Chris Lattner | 3648c67 | 2005-05-13 21:44:04 +0000 | [diff] [blame] | 425 | // If we are performing frame pointer elimination and if the callee pops |
| 426 | // something off the stack pointer, add it back. We do this until we have |
| 427 | // more advanced stack pointer tracking ability. |
Chris Lattner | 6180780 | 2007-04-25 04:25:10 +0000 | [diff] [blame] | 428 | if (uint64_t CalleeAmt = I->getOperand(1).getImm()) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 429 | unsigned Opc = (CalleeAmt < 128) ? |
| 430 | (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) : |
| 431 | (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri); |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 432 | MachineInstr *Old = I; |
Jeff Cohen | 00b16889 | 2005-07-27 06:12:32 +0000 | [diff] [blame] | 433 | MachineInstr *New = |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 434 | BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), |
| 435 | StackPtr).addReg(StackPtr).addImm(CalleeAmt); |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 436 | // The EFLAGS implicit def is dead. |
| 437 | New->getOperand(3).setIsDead(); |
| 438 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 439 | MBB.insert(I, New); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 440 | } |
| 441 | } |
| 442 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 443 | MBB.erase(I); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 444 | } |
| 445 | |
Evan Cheng | 5e6df46 | 2007-02-28 00:21:17 +0000 | [diff] [blame] | 446 | void X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II, |
Evan Cheng | 97de913 | 2007-05-01 09:13:03 +0000 | [diff] [blame] | 447 | int SPAdj, RegScavenger *RS) const{ |
| 448 | assert(SPAdj == 0 && "Unexpected"); |
| 449 | |
Chris Lattner | d264bec | 2003-01-13 00:50:33 +0000 | [diff] [blame] | 450 | unsigned i = 0; |
Alkis Evlogimenos | c0b9dc5 | 2004-02-12 02:27:10 +0000 | [diff] [blame] | 451 | MachineInstr &MI = *II; |
Nate Begeman | f8be5e9 | 2004-08-14 22:05:10 +0000 | [diff] [blame] | 452 | MachineFunction &MF = *MI.getParent()->getParent(); |
Dan Gohman | d735b80 | 2008-10-03 15:45:36 +0000 | [diff] [blame] | 453 | while (!MI.getOperand(i).isFI()) { |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 454 | ++i; |
| 455 | assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!"); |
| 456 | } |
| 457 | |
Chris Lattner | 8aa797a | 2007-12-30 23:10:15 +0000 | [diff] [blame] | 458 | int FrameIndex = MI.getOperand(i).getIndex(); |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 459 | |
| 460 | unsigned BasePtr; |
| 461 | if (needsStackRealignment(MF)) |
| 462 | BasePtr = (FrameIndex < 0 ? FramePtr : StackPtr); |
| 463 | else |
| 464 | BasePtr = (hasFP(MF) ? FramePtr : StackPtr); |
| 465 | |
Chris Lattner | d264bec | 2003-01-13 00:50:33 +0000 | [diff] [blame] | 466 | // This must be part of a four operand memory reference. Replace the |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 467 | // FrameIndex with base register with EBP. Add an offset to the offset. |
Anton Korobeynikov | 8e91ec5 | 2008-04-23 18:21:02 +0000 | [diff] [blame] | 468 | MI.getOperand(i).ChangeToRegister(BasePtr, false); |
Chris Lattner | d264bec | 2003-01-13 00:50:33 +0000 | [diff] [blame] | 469 | |
Dan Gohman | 8277970 | 2008-12-24 00:27:51 +0000 | [diff] [blame] | 470 | // Now add the frame object offset to the offset from EBP. |
| 471 | if (MI.getOperand(i+3).isImm()) { |
| 472 | // Offset is a 32-bit integer. |
| 473 | int Offset = getFrameIndexOffset(MF, FrameIndex) + |
| 474 | (int)(MI.getOperand(i+3).getImm()); |
| 475 | |
| 476 | MI.getOperand(i+3).ChangeToImmediate(Offset); |
| 477 | } else { |
| 478 | // Offset is symbolic. This is extremely rare. |
| 479 | uint64_t Offset = getFrameIndexOffset(MF, FrameIndex) + |
| 480 | (uint64_t)MI.getOperand(i+3).getOffset(); |
| 481 | MI.getOperand(i+3).setOffset(Offset); |
| 482 | } |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 483 | } |
| 484 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 485 | void |
Anton Korobeynikov | b51dce3 | 2008-04-23 18:20:17 +0000 | [diff] [blame] | 486 | X86RegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF, |
| 487 | RegScavenger *RS) const { |
| 488 | MachineFrameInfo *FFI = MF.getFrameInfo(); |
| 489 | |
| 490 | // Calculate and set max stack object alignment early, so we can decide |
| 491 | // whether we will need stack realignment (and thus FP). |
Anton Korobeynikov | dc28bd4 | 2008-04-23 18:23:50 +0000 | [diff] [blame] | 492 | unsigned MaxAlign = std::max(FFI->getMaxAlignment(), |
| 493 | calculateMaxStackAlignment(FFI)); |
Anton Korobeynikov | b51dce3 | 2008-04-23 18:20:17 +0000 | [diff] [blame] | 494 | |
| 495 | FFI->setMaxAlignment(MaxAlign); |
| 496 | } |
| 497 | |
| 498 | void |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 499 | X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF) const{ |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 500 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
| 501 | int32_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); |
| 502 | if (TailCallReturnAddrDelta < 0) { |
| 503 | // create RETURNADDR area |
| 504 | // arg |
| 505 | // arg |
| 506 | // RETADDR |
| 507 | // { ... |
| 508 | // RETADDR area |
| 509 | // ... |
| 510 | // } |
| 511 | // [EBP] |
| 512 | MF.getFrameInfo()-> |
| 513 | CreateFixedObject(-TailCallReturnAddrDelta, |
| 514 | (-1*SlotSize)+TailCallReturnAddrDelta); |
| 515 | } |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 516 | if (hasFP(MF)) { |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 517 | assert((TailCallReturnAddrDelta <= 0) && |
| 518 | "The Delta should always be zero or negative"); |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 519 | // Create a frame entry for the EBP register that must be saved. |
Chris Lattner | 7c6eefa | 2007-04-25 17:23:53 +0000 | [diff] [blame] | 520 | int FrameIdx = MF.getFrameInfo()->CreateFixedObject(SlotSize, |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 521 | (int)SlotSize * -2+ |
| 522 | TailCallReturnAddrDelta); |
Chris Lattner | 96c3d2e | 2004-02-15 00:15:37 +0000 | [diff] [blame] | 523 | assert(FrameIdx == MF.getFrameInfo()->getObjectIndexBegin() && |
| 524 | "Slot for EBP register must be last in order to be found!"); |
Devang Patel | fd1c6c3 | 2008-12-23 21:56:28 +0000 | [diff] [blame] | 525 | FrameIdx = 0; |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 526 | } |
| 527 | } |
| 528 | |
Evan Cheng | a24dddd | 2007-04-26 01:09:28 +0000 | [diff] [blame] | 529 | /// emitSPUpdate - Emit a series of instructions to increment / decrement the |
| 530 | /// stack pointer by a constant value. |
| 531 | static |
| 532 | void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, |
| 533 | unsigned StackPtr, int64_t NumBytes, bool Is64Bit, |
| 534 | const TargetInstrInfo &TII) { |
| 535 | bool isSub = NumBytes < 0; |
| 536 | uint64_t Offset = isSub ? -NumBytes : NumBytes; |
| 537 | unsigned Opc = isSub |
| 538 | ? ((Offset < 128) ? |
| 539 | (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) : |
| 540 | (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri)) |
| 541 | : ((Offset < 128) ? |
| 542 | (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) : |
| 543 | (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri)); |
| 544 | uint64_t Chunk = (1LL << 31) - 1; |
Bill Wendling | 5a45d76 | 2009-02-21 01:11:36 +0000 | [diff] [blame] | 545 | DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() : |
| 546 | DebugLoc::getUnknownLoc()); |
Evan Cheng | a24dddd | 2007-04-26 01:09:28 +0000 | [diff] [blame] | 547 | |
| 548 | while (Offset) { |
| 549 | uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset; |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 550 | MachineInstr *MI = |
Dale Johannesen | 8d13f8f | 2009-02-13 02:33:27 +0000 | [diff] [blame] | 551 | BuildMI(MBB, MBBI, DL, TII.get(Opc), StackPtr) |
| 552 | .addReg(StackPtr).addImm(ThisVal); |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 553 | // The EFLAGS implicit def is dead. |
| 554 | MI->getOperand(3).setIsDead(); |
Evan Cheng | a24dddd | 2007-04-26 01:09:28 +0000 | [diff] [blame] | 555 | Offset -= ThisVal; |
| 556 | } |
| 557 | } |
| 558 | |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 559 | // mergeSPUpdatesUp - Merge two stack-manipulating instructions upper iterator. |
| 560 | static |
| 561 | void mergeSPUpdatesUp(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI, |
| 562 | unsigned StackPtr, uint64_t *NumBytes = NULL) { |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 563 | if (MBBI == MBB.begin()) return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 564 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 565 | MachineBasicBlock::iterator PI = prior(MBBI); |
| 566 | unsigned Opc = PI->getOpcode(); |
| 567 | if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 || |
| 568 | Opc == X86::ADD32ri || Opc == X86::ADD32ri8) && |
| 569 | PI->getOperand(0).getReg() == StackPtr) { |
| 570 | if (NumBytes) |
| 571 | *NumBytes += PI->getOperand(2).getImm(); |
| 572 | MBB.erase(PI); |
| 573 | } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 || |
| 574 | Opc == X86::SUB32ri || Opc == X86::SUB32ri8) && |
| 575 | PI->getOperand(0).getReg() == StackPtr) { |
| 576 | if (NumBytes) |
| 577 | *NumBytes -= PI->getOperand(2).getImm(); |
| 578 | MBB.erase(PI); |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 579 | } |
| 580 | } |
| 581 | |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 582 | // mergeSPUpdatesUp - Merge two stack-manipulating instructions lower iterator. |
| 583 | static |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 584 | void mergeSPUpdatesDown(MachineBasicBlock &MBB, |
| 585 | MachineBasicBlock::iterator &MBBI, |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 586 | unsigned StackPtr, uint64_t *NumBytes = NULL) { |
Chris Lattner | f443ba7 | 2007-10-07 22:00:31 +0000 | [diff] [blame] | 587 | return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 588 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 589 | if (MBBI == MBB.end()) return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 590 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 591 | MachineBasicBlock::iterator NI = next(MBBI); |
| 592 | if (NI == MBB.end()) return; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 593 | |
Chris Lattner | eac9385 | 2007-10-07 21:53:12 +0000 | [diff] [blame] | 594 | unsigned Opc = NI->getOpcode(); |
| 595 | if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 || |
| 596 | Opc == X86::ADD32ri || Opc == X86::ADD32ri8) && |
| 597 | NI->getOperand(0).getReg() == StackPtr) { |
| 598 | if (NumBytes) |
| 599 | *NumBytes -= NI->getOperand(2).getImm(); |
| 600 | MBB.erase(NI); |
| 601 | MBBI = NI; |
| 602 | } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 || |
| 603 | Opc == X86::SUB32ri || Opc == X86::SUB32ri8) && |
| 604 | NI->getOperand(0).getReg() == StackPtr) { |
| 605 | if (NumBytes) |
| 606 | *NumBytes += NI->getOperand(2).getImm(); |
| 607 | MBB.erase(NI); |
| 608 | MBBI = NI; |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 609 | } |
| 610 | } |
| 611 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 612 | /// mergeSPUpdates - Checks the instruction before/after the passed |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 613 | /// instruction. If it is an ADD/SUB instruction it is deleted |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 614 | /// 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] | 615 | /// and a negative for SUB. |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 616 | static int mergeSPUpdates(MachineBasicBlock &MBB, |
| 617 | MachineBasicBlock::iterator &MBBI, |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 618 | unsigned StackPtr, |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 619 | bool doMergeWithPrevious) { |
| 620 | |
| 621 | if ((doMergeWithPrevious && MBBI == MBB.begin()) || |
| 622 | (!doMergeWithPrevious && MBBI == MBB.end())) |
| 623 | return 0; |
| 624 | |
| 625 | int Offset = 0; |
| 626 | |
| 627 | MachineBasicBlock::iterator PI = doMergeWithPrevious ? prior(MBBI) : MBBI; |
| 628 | MachineBasicBlock::iterator NI = doMergeWithPrevious ? 0 : next(MBBI); |
| 629 | unsigned Opc = PI->getOpcode(); |
| 630 | if ((Opc == X86::ADD64ri32 || Opc == X86::ADD64ri8 || |
| 631 | Opc == X86::ADD32ri || Opc == X86::ADD32ri8) && |
| 632 | PI->getOperand(0).getReg() == StackPtr){ |
| 633 | Offset += PI->getOperand(2).getImm(); |
| 634 | MBB.erase(PI); |
| 635 | if (!doMergeWithPrevious) MBBI = NI; |
| 636 | } else if ((Opc == X86::SUB64ri32 || Opc == X86::SUB64ri8 || |
| 637 | Opc == X86::SUB32ri || Opc == X86::SUB32ri8) && |
| 638 | PI->getOperand(0).getReg() == StackPtr) { |
| 639 | Offset -= PI->getOperand(2).getImm(); |
| 640 | MBB.erase(PI); |
| 641 | if (!doMergeWithPrevious) MBBI = NI; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 642 | } |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 643 | |
| 644 | return Offset; |
| 645 | } |
| 646 | |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 647 | void X86RegisterInfo::emitFrameMoves(MachineFunction &MF, |
| 648 | unsigned FrameLabelId, |
| 649 | unsigned ReadyLabelId) const { |
| 650 | MachineFrameInfo *MFI = MF.getFrameInfo(); |
| 651 | MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
| 652 | if (!MMI) |
| 653 | return; |
| 654 | |
| 655 | uint64_t StackSize = MFI->getStackSize(); |
| 656 | std::vector<MachineMove> &Moves = MMI->getFrameMoves(); |
| 657 | const TargetData *TD = MF.getTarget().getTargetData(); |
| 658 | |
| 659 | // Calculate amount of bytes used for return address storing |
| 660 | int stackGrowth = |
| 661 | (MF.getTarget().getFrameInfo()->getStackGrowthDirection() == |
| 662 | TargetFrameInfo::StackGrowsUp ? |
| 663 | TD->getPointerSize() : -TD->getPointerSize()); |
| 664 | |
| 665 | if (StackSize) { |
| 666 | // Show update of SP. |
| 667 | if (hasFP(MF)) { |
| 668 | // Adjust SP |
| 669 | MachineLocation SPDst(MachineLocation::VirtualFP); |
| 670 | MachineLocation SPSrc(MachineLocation::VirtualFP, 2*stackGrowth); |
| 671 | Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc)); |
| 672 | } else { |
| 673 | MachineLocation SPDst(MachineLocation::VirtualFP); |
| 674 | MachineLocation SPSrc(MachineLocation::VirtualFP, |
| 675 | -StackSize+stackGrowth); |
| 676 | Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc)); |
| 677 | } |
| 678 | } else { |
| 679 | //FIXME: Verify & implement for FP |
| 680 | MachineLocation SPDst(StackPtr); |
| 681 | MachineLocation SPSrc(StackPtr, stackGrowth); |
| 682 | Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc)); |
| 683 | } |
| 684 | |
| 685 | // Add callee saved registers to move list. |
| 686 | const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo(); |
| 687 | |
| 688 | // FIXME: This is dirty hack. The code itself is pretty mess right now. |
| 689 | // It should be rewritten from scratch and generalized sometimes. |
| 690 | |
| 691 | // Determine maximum offset (minumum due to stack growth) |
| 692 | int64_t MaxOffset = 0; |
| 693 | for (unsigned I = 0, E = CSI.size(); I!=E; ++I) |
| 694 | MaxOffset = std::min(MaxOffset, |
| 695 | MFI->getObjectOffset(CSI[I].getFrameIdx())); |
| 696 | |
| 697 | // Calculate offsets |
| 698 | int64_t saveAreaOffset = (hasFP(MF) ? 3 : 2)*stackGrowth; |
| 699 | for (unsigned I = 0, E = CSI.size(); I!=E; ++I) { |
| 700 | int64_t Offset = MFI->getObjectOffset(CSI[I].getFrameIdx()); |
| 701 | unsigned Reg = CSI[I].getReg(); |
| 702 | Offset = (MaxOffset-Offset+saveAreaOffset); |
| 703 | MachineLocation CSDst(MachineLocation::VirtualFP, Offset); |
| 704 | MachineLocation CSSrc(Reg); |
| 705 | Moves.push_back(MachineMove(FrameLabelId, CSDst, CSSrc)); |
| 706 | } |
| 707 | |
| 708 | if (hasFP(MF)) { |
| 709 | // Save FP |
| 710 | MachineLocation FPDst(MachineLocation::VirtualFP, 2*stackGrowth); |
| 711 | MachineLocation FPSrc(FramePtr); |
| 712 | Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc)); |
| 713 | } |
| 714 | |
| 715 | MachineLocation FPDst(hasFP(MF) ? FramePtr : StackPtr); |
| 716 | MachineLocation FPSrc(MachineLocation::VirtualFP); |
| 717 | Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc)); |
| 718 | } |
| 719 | |
| 720 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 721 | void X86RegisterInfo::emitPrologue(MachineFunction &MF) const { |
Chris Lattner | 198ab64 | 2002-12-15 20:06:35 +0000 | [diff] [blame] | 722 | MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB |
Chris Lattner | eafa423 | 2003-01-15 22:57:35 +0000 | [diff] [blame] | 723 | MachineFrameInfo *MFI = MF.getFrameInfo(); |
Evan Cheng | 3649b0e | 2006-06-02 22:38:37 +0000 | [diff] [blame] | 724 | const Function* Fn = MF.getFunction(); |
| 725 | const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>(); |
Jim Laskey | 44c3b9f | 2007-01-26 21:22:28 +0000 | [diff] [blame] | 726 | MachineModuleInfo *MMI = MFI->getMachineModuleInfo(); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 727 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
| 728 | MachineBasicBlock::iterator MBBI = MBB.begin(); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 729 | bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) || |
Dale Johannesen | 4e1b794 | 2008-04-08 00:10:24 +0000 | [diff] [blame] | 730 | !Fn->doesNotThrow() || |
Dale Johannesen | 3541af7 | 2008-04-14 17:54:17 +0000 | [diff] [blame] | 731 | UnwindTablesMandatory; |
Bill Wendling | 5a45d76 | 2009-02-21 01:11:36 +0000 | [diff] [blame] | 732 | DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() : |
| 733 | DebugLoc::getUnknownLoc()); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 734 | |
Jim Laskey | 072200c | 2007-01-29 18:51:14 +0000 | [diff] [blame] | 735 | // Prepare for frame info. |
Dan Gohman | 5e6e93e | 2007-09-24 16:44:26 +0000 | [diff] [blame] | 736 | unsigned FrameLabelId = 0; |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 737 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 738 | // Get the number of bytes to allocate from the FrameInfo. |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 739 | uint64_t StackSize = MFI->getStackSize(); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 740 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 741 | // Get desired stack alignment |
| 742 | uint64_t MaxAlign = MFI->getMaxAlignment(); |
| 743 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 744 | // Add RETADDR move area to callee saved frame size. |
| 745 | int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta(); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 746 | if (TailCallReturnAddrDelta < 0) |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 747 | X86FI->setCalleeSavedFrameSize( |
| 748 | X86FI->getCalleeSavedFrameSize() +(-TailCallReturnAddrDelta)); |
Evan Cheng | d9245ca | 2006-04-14 07:26:43 +0000 | [diff] [blame] | 749 | |
Dan Gohman | 336b636 | 2009-01-27 00:40:06 +0000 | [diff] [blame] | 750 | // If this is x86-64 and the Red Zone is not disabled, if we are a leaf |
| 751 | // function, and use up to 128 bytes of stack space, don't have a frame |
| 752 | // pointer, calls, or dynamic alloca then we do not need to adjust the |
| 753 | // stack pointer (we fit in the Red Zone). |
| 754 | if (Is64Bit && !DisableRedZone && |
| 755 | !needsStackRealignment(MF) && |
| 756 | !MFI->hasVarSizedObjects() && // No dynamic alloca. |
| 757 | !MFI->hasCalls()) { // No calls. |
| 758 | uint64_t MinSize = X86FI->getCalleeSavedFrameSize(); |
| 759 | if (hasFP(MF)) MinSize += SlotSize; |
| 760 | StackSize = std::max(MinSize, |
| 761 | StackSize > 128 ? StackSize - 128 : 0); |
| 762 | MFI->setStackSize(StackSize); |
| 763 | } |
| 764 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 765 | // Insert stack pointer adjustment for later moving of return addr. Only |
| 766 | // applies to tail call optimized functions where the callee argument stack |
| 767 | // size is bigger than the callers. |
| 768 | if (TailCallReturnAddrDelta < 0) { |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 769 | MachineInstr *MI = |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 770 | BuildMI(MBB, MBBI, DL, TII.get(Is64Bit? X86::SUB64ri32 : X86::SUB32ri), |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 771 | StackPtr).addReg(StackPtr).addImm(-TailCallReturnAddrDelta); |
| 772 | // The EFLAGS implicit def is dead. |
| 773 | MI->getOperand(3).setIsDead(); |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 774 | } |
| 775 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 776 | uint64_t NumBytes = 0; |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 777 | if (hasFP(MF)) { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 778 | // Calculate required stack adjustment |
| 779 | uint64_t FrameSize = StackSize - SlotSize; |
| 780 | if (needsStackRealignment(MF)) |
| 781 | FrameSize = (FrameSize + MaxAlign - 1)/MaxAlign*MaxAlign; |
| 782 | |
| 783 | NumBytes = FrameSize - X86FI->getCalleeSavedFrameSize(); |
| 784 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 785 | // Get the offset of the stack slot for the EBP register... which is |
| 786 | // guaranteed to be the last slot by processFunctionBeforeFrameFinalized. |
| 787 | // Update the frame offset adjustment. |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 788 | MFI->setOffsetAdjustment(-NumBytes); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 789 | |
| 790 | // Save EBP into the appropriate stack slot... |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 791 | BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::PUSH64r : X86::PUSH32r)) |
Dan Gohman | 25a1b47 | 2008-11-26 06:39:12 +0000 | [diff] [blame] | 792 | .addReg(FramePtr, /*isDef=*/false, /*isImp=*/false, /*isKill=*/true); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 793 | |
Bill Wendling | 92c1e12 | 2009-02-13 02:16:35 +0000 | [diff] [blame] | 794 | if (needsFrameMoves) { |
| 795 | // Mark effective beginning of when frame pointer becomes valid. |
| 796 | FrameLabelId = MMI->NextLabelID(); |
| 797 | BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId); |
| 798 | } |
| 799 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 800 | // Update EBP with the new base value... |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 801 | BuildMI(MBB, MBBI, DL, |
| 802 | TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), FramePtr) |
| 803 | .addReg(StackPtr); |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 804 | |
Dan Gohman | 34d6ad7 | 2008-12-18 22:01:52 +0000 | [diff] [blame] | 805 | // Mark the FramePtr as live-in in every block except the entry. |
| 806 | for (MachineFunction::iterator I = next(MF.begin()), E = MF.end(); |
| 807 | I != E; ++I) |
| 808 | I->addLiveIn(FramePtr); |
| 809 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 810 | // Realign stack |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 811 | if (needsStackRealignment(MF)) { |
| 812 | MachineInstr *MI = |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 813 | BuildMI(MBB, MBBI, DL, |
Dan Gohman | bfd23c9 | 2008-12-18 22:03:42 +0000 | [diff] [blame] | 814 | TII.get(Is64Bit ? X86::AND64ri32 : X86::AND32ri), |
| 815 | StackPtr).addReg(StackPtr).addImm(-MaxAlign); |
| 816 | // The EFLAGS implicit def is dead. |
| 817 | MI->getOperand(3).setIsDead(); |
| 818 | } |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 819 | } else { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 820 | NumBytes = StackSize - X86FI->getCalleeSavedFrameSize(); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 821 | } |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 822 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 823 | unsigned ReadyLabelId = 0; |
Bill Wendling | 92c1e12 | 2009-02-13 02:16:35 +0000 | [diff] [blame] | 824 | if (needsFrameMoves) { |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 825 | // Mark effective beginning of when frame pointer is ready. |
| 826 | ReadyLabelId = MMI->NextLabelID(); |
Bill Wendling | 92c1e12 | 2009-02-13 02:16:35 +0000 | [diff] [blame] | 827 | BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(ReadyLabelId); |
| 828 | } |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 829 | |
| 830 | // Skip the callee-saved push instructions. |
| 831 | while (MBBI != MBB.end() && |
| 832 | (MBBI->getOpcode() == X86::PUSH32r || |
| 833 | MBBI->getOpcode() == X86::PUSH64r)) |
| 834 | ++MBBI; |
| 835 | |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 836 | if (MBBI != MBB.end()) |
| 837 | DL = MBBI->getDebugLoc(); |
| 838 | |
Evan Cheng | d9245ca | 2006-04-14 07:26:43 +0000 | [diff] [blame] | 839 | if (NumBytes) { // adjust stack pointer: ESP -= numbytes |
Anton Korobeynikov | 317848f | 2007-01-03 11:43:14 +0000 | [diff] [blame] | 840 | if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) { |
Anton Korobeynikov | 57fc00d | 2007-04-17 09:20:00 +0000 | [diff] [blame] | 841 | // Check, whether EAX is livein for this function |
| 842 | bool isEAXAlive = false; |
Chris Lattner | 84bc542 | 2007-12-31 04:13:23 +0000 | [diff] [blame] | 843 | for (MachineRegisterInfo::livein_iterator |
| 844 | II = MF.getRegInfo().livein_begin(), |
| 845 | EE = MF.getRegInfo().livein_end(); (II != EE) && !isEAXAlive; ++II) { |
Anton Korobeynikov | 57fc00d | 2007-04-17 09:20:00 +0000 | [diff] [blame] | 846 | unsigned Reg = II->first; |
| 847 | isEAXAlive = (Reg == X86::EAX || Reg == X86::AX || |
| 848 | Reg == X86::AH || Reg == X86::AL); |
| 849 | } |
| 850 | |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 851 | // Function prologue calls _alloca to probe the stack when allocating |
| 852 | // more than 4k bytes in one go. Touching the stack at 4K increments is |
Evan Cheng | 004fb92 | 2006-06-13 05:14:44 +0000 | [diff] [blame] | 853 | // necessary to ensure that the guard pages used by the OS virtual memory |
| 854 | // manager are allocated in correct sequence. |
Anton Korobeynikov | 57fc00d | 2007-04-17 09:20:00 +0000 | [diff] [blame] | 855 | if (!isEAXAlive) { |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 856 | BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX) |
| 857 | .addImm(NumBytes); |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 858 | BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32)) |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 859 | .addExternalSymbol("_alloca"); |
Anton Korobeynikov | 57fc00d | 2007-04-17 09:20:00 +0000 | [diff] [blame] | 860 | } else { |
| 861 | // Save EAX |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 862 | BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r)) |
Dan Gohman | 25a1b47 | 2008-11-26 06:39:12 +0000 | [diff] [blame] | 863 | .addReg(X86::EAX, /*isDef=*/false, /*isImp=*/false, /*isKill=*/true); |
Anton Korobeynikov | 57fc00d | 2007-04-17 09:20:00 +0000 | [diff] [blame] | 864 | // Allocate NumBytes-4 bytes on stack. We'll also use 4 already |
| 865 | // allocated bytes for EAX. |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 866 | BuildMI(MBB, MBBI, DL, |
| 867 | TII.get(X86::MOV32ri), X86::EAX).addImm(NumBytes-4); |
| 868 | BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32)) |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 869 | .addExternalSymbol("_alloca"); |
Anton Korobeynikov | 57fc00d | 2007-04-17 09:20:00 +0000 | [diff] [blame] | 870 | // Restore EAX |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 871 | MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm), |
| 872 | X86::EAX), |
Evan Cheng | 9f1c831 | 2008-07-03 09:09:37 +0000 | [diff] [blame] | 873 | StackPtr, false, NumBytes-4); |
Anton Korobeynikov | 57fc00d | 2007-04-17 09:20:00 +0000 | [diff] [blame] | 874 | MBB.insert(MBBI, MI); |
| 875 | } |
Evan Cheng | 004fb92 | 2006-06-13 05:14:44 +0000 | [diff] [blame] | 876 | } else { |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 877 | // If there is an SUB32ri of ESP immediately before this instruction, |
| 878 | // merge the two. This can be the case when tail call elimination is |
| 879 | // enabled and the callee has more arguments then the caller. |
| 880 | NumBytes -= mergeSPUpdates(MBB, MBBI, StackPtr, true); |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 881 | // If there is an ADD32ri or SUB32ri of ESP immediately after this |
Evan Cheng | 9b8c674 | 2007-07-17 21:26:42 +0000 | [diff] [blame] | 882 | // instruction, merge the two instructions. |
Anton Korobeynikov | 2508372 | 2007-10-06 16:39:43 +0000 | [diff] [blame] | 883 | mergeSPUpdatesDown(MBB, MBBI, StackPtr, &NumBytes); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 884 | |
Evan Cheng | 9b8c674 | 2007-07-17 21:26:42 +0000 | [diff] [blame] | 885 | if (NumBytes) |
| 886 | emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII); |
Evan Cheng | 004fb92 | 2006-06-13 05:14:44 +0000 | [diff] [blame] | 887 | } |
Evan Cheng | d9245ca | 2006-04-14 07:26:43 +0000 | [diff] [blame] | 888 | } |
| 889 | |
Anton Korobeynikov | 9bbbea5 | 2008-04-23 18:15:48 +0000 | [diff] [blame] | 890 | if (needsFrameMoves) |
| 891 | emitFrameMoves(MF, FrameLabelId, ReadyLabelId); |
Misha Brukman | 2adb395 | 2002-12-04 23:57:03 +0000 | [diff] [blame] | 892 | } |
| 893 | |
Chris Lattner | bb07ef9 | 2004-02-14 19:49:54 +0000 | [diff] [blame] | 894 | void X86RegisterInfo::emitEpilogue(MachineFunction &MF, |
| 895 | MachineBasicBlock &MBB) const { |
Chris Lattner | aa09b75 | 2002-12-28 21:08:28 +0000 | [diff] [blame] | 896 | const MachineFrameInfo *MFI = MF.getFrameInfo(); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 897 | X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>(); |
Alkis Evlogimenos | f81af21 | 2004-02-14 01:18:34 +0000 | [diff] [blame] | 898 | MachineBasicBlock::iterator MBBI = prior(MBB.end()); |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 899 | unsigned RetOpcode = MBBI->getOpcode(); |
Bill Wendling | 2625f9b | 2009-02-21 00:32:08 +0000 | [diff] [blame] | 900 | DebugLoc DL = MBBI->getDebugLoc(); |
Chris Lattner | 2b3d56e | 2005-05-14 23:35:21 +0000 | [diff] [blame] | 901 | |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 902 | switch (RetOpcode) { |
Chris Lattner | 2b3d56e | 2005-05-14 23:35:21 +0000 | [diff] [blame] | 903 | case X86::RET: |
| 904 | case X86::RETI: |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 905 | case X86::TCRETURNdi: |
| 906 | case X86::TCRETURNri: |
| 907 | case X86::TCRETURNri64: |
| 908 | case X86::TCRETURNdi64: |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 909 | case X86::EH_RETURN: |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 910 | case X86::EH_RETURN64: |
Chris Lattner | 2b3d56e | 2005-05-14 23:35:21 +0000 | [diff] [blame] | 911 | case X86::TAILJMPd: |
| 912 | case X86::TAILJMPr: |
| 913 | case X86::TAILJMPm: break; // These are ok |
| 914 | default: |
| 915 | assert(0 && "Can only insert epilog into returning blocks"); |
| 916 | } |
Misha Brukman | 2adb395 | 2002-12-04 23:57:03 +0000 | [diff] [blame] | 917 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 918 | // Get the number of bytes to allocate from the FrameInfo |
| 919 | uint64_t StackSize = MFI->getStackSize(); |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 920 | uint64_t MaxAlign = MFI->getMaxAlignment(); |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 921 | unsigned CSSize = X86FI->getCalleeSavedFrameSize(); |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 922 | uint64_t NumBytes = 0; |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 923 | |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 924 | if (hasFP(MF)) { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 925 | // Calculate required stack adjustment |
| 926 | uint64_t FrameSize = StackSize - SlotSize; |
| 927 | if (needsStackRealignment(MF)) |
| 928 | FrameSize = (FrameSize + MaxAlign - 1)/MaxAlign*MaxAlign; |
| 929 | |
| 930 | NumBytes = FrameSize - CSSize; |
| 931 | |
Evan Cheng | 89d1659 | 2007-07-17 07:59:08 +0000 | [diff] [blame] | 932 | // pop EBP. |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 933 | BuildMI(MBB, MBBI, DL, |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 934 | TII.get(Is64Bit ? X86::POP64r : X86::POP32r), FramePtr); |
Bill Wendling | 2625f9b | 2009-02-21 00:32:08 +0000 | [diff] [blame] | 935 | } else { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 936 | NumBytes = StackSize - CSSize; |
Bill Wendling | 2625f9b | 2009-02-21 00:32:08 +0000 | [diff] [blame] | 937 | } |
Anton Korobeynikov | 2365f51 | 2007-07-14 14:06:15 +0000 | [diff] [blame] | 938 | |
Evan Cheng | f27795d | 2007-07-17 18:03:34 +0000 | [diff] [blame] | 939 | // Skip the callee-saved pop instructions. |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 940 | MachineBasicBlock::iterator LastCSPop = MBBI; |
Evan Cheng | f27795d | 2007-07-17 18:03:34 +0000 | [diff] [blame] | 941 | while (MBBI != MBB.begin()) { |
Evan Cheng | fcc8793 | 2007-07-26 17:45:41 +0000 | [diff] [blame] | 942 | MachineBasicBlock::iterator PI = prior(MBBI); |
| 943 | unsigned Opc = PI->getOpcode(); |
Bill Wendling | f7c0940 | 2008-10-31 18:30:19 +0000 | [diff] [blame] | 944 | if (Opc != X86::POP32r && Opc != X86::POP64r && |
| 945 | !PI->getDesc().isTerminator()) |
Evan Cheng | f27795d | 2007-07-17 18:03:34 +0000 | [diff] [blame] | 946 | break; |
| 947 | --MBBI; |
| 948 | } |
| 949 | |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 950 | DL = MBBI->getDebugLoc(); |
| 951 | |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 952 | // If there is an ADD32ri or SUB32ri of ESP immediately before this |
| 953 | // instruction, merge the two instructions. |
| 954 | if (NumBytes || MFI->hasVarSizedObjects()) |
| 955 | mergeSPUpdatesUp(MBB, MBBI, StackPtr, &NumBytes); |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 956 | |
Anton Korobeynikov | 4f1c33f | 2007-10-06 16:17:49 +0000 | [diff] [blame] | 957 | // 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] | 958 | // slot before popping them off! Same applies for the case, when stack was |
| 959 | // realigned |
| 960 | if (needsStackRealignment(MF)) { |
| 961 | // We cannot use LEA here, because stack pointer was realigned. We need to |
| 962 | // deallocate local frame back |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 963 | if (CSSize) { |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 964 | emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII); |
| 965 | MBBI = prior(LastCSPop); |
| 966 | } |
| 967 | |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 968 | BuildMI(MBB, MBBI, DL, |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 969 | TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), |
| 970 | StackPtr).addReg(FramePtr); |
| 971 | } else if (MFI->hasVarSizedObjects()) { |
| 972 | if (CSSize) { |
| 973 | unsigned Opc = Is64Bit ? X86::LEA64r : X86::LEA32r; |
Rafael Espindola | 2a6411b | 2009-04-07 21:37:46 +0000 | [diff] [blame^] | 974 | MachineInstr *MI = addLeaRegOffset(BuildMI(MF, DL, TII.get(Opc), StackPtr), |
| 975 | FramePtr, false, -CSSize); |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 976 | MBB.insert(MBBI, MI); |
| 977 | } else |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 978 | BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), |
Nate Begeman | beb572b | 2008-07-25 17:34:41 +0000 | [diff] [blame] | 979 | StackPtr).addReg(FramePtr); |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 980 | |
Anton Korobeynikov | 2c430cb | 2008-04-23 18:21:27 +0000 | [diff] [blame] | 981 | } else { |
| 982 | // adjust stack pointer back: ESP += numbytes |
| 983 | if (NumBytes) |
| 984 | emitSPUpdate(MBB, MBBI, StackPtr, NumBytes, Is64Bit, TII); |
Evan Cheng | 3c46eef | 2007-07-18 21:26:06 +0000 | [diff] [blame] | 985 | } |
| 986 | |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 987 | // We're returning from function via eh_return. |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 988 | if (RetOpcode == X86::EH_RETURN || RetOpcode == X86::EH_RETURN64) { |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 989 | MBBI = prior(MBB.end()); |
| 990 | MachineOperand &DestAddr = MBBI->getOperand(0); |
Dan Gohman | d735b80 | 2008-10-03 15:45:36 +0000 | [diff] [blame] | 991 | assert(DestAddr.isReg() && "Offset should be in register!"); |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 992 | BuildMI(MBB, MBBI, DL, |
Anton Korobeynikov | b84c167 | 2008-09-08 21:12:47 +0000 | [diff] [blame] | 993 | TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr), |
| 994 | StackPtr).addReg(DestAddr.getReg()); |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 995 | // Tail call return: adjust the stack pointer and jump to callee |
| 996 | } else if (RetOpcode == X86::TCRETURNri || RetOpcode == X86::TCRETURNdi || |
| 997 | RetOpcode== X86::TCRETURNri64 || RetOpcode == X86::TCRETURNdi64) { |
| 998 | MBBI = prior(MBB.end()); |
| 999 | MachineOperand &JumpTarget = MBBI->getOperand(0); |
| 1000 | MachineOperand &StackAdjust = MBBI->getOperand(1); |
Dan Gohman | d735b80 | 2008-10-03 15:45:36 +0000 | [diff] [blame] | 1001 | assert(StackAdjust.isImm() && "Expecting immediate value."); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 1002 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1003 | // Adjust stack pointer. |
| 1004 | int StackAdj = StackAdjust.getImm(); |
| 1005 | int MaxTCDelta = X86FI->getTCReturnAddrDelta(); |
| 1006 | int Offset = 0; |
| 1007 | assert(MaxTCDelta <= 0 && "MaxTCDelta should never be positive"); |
| 1008 | // Incoporate the retaddr area. |
| 1009 | Offset = StackAdj-MaxTCDelta; |
| 1010 | assert(Offset >= 0 && "Offset should never be negative"); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1011 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1012 | if (Offset) { |
| 1013 | // Check for possible merge with preceeding ADD instruction. |
| 1014 | Offset += mergeSPUpdates(MBB, MBBI, StackPtr, true); |
| 1015 | emitSPUpdate(MBB, MBBI, StackPtr, Offset, Is64Bit, TII); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 1016 | } |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1017 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1018 | // Jump to label or value in register. |
| 1019 | if (RetOpcode == X86::TCRETURNdi|| RetOpcode == X86::TCRETURNdi64) |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1020 | BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPd)). |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1021 | addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset()); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1022 | else if (RetOpcode== X86::TCRETURNri64) |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1023 | BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr64), JumpTarget.getReg()); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1024 | else |
Dale Johannesen | 21b5541 | 2009-02-12 23:08:38 +0000 | [diff] [blame] | 1025 | BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr), JumpTarget.getReg()); |
Bill Wendling | 3d2445f | 2009-02-21 00:43:56 +0000 | [diff] [blame] | 1026 | |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1027 | // Delete the pseudo instruction TCRETURN. |
| 1028 | MBB.erase(MBBI); |
Anton Korobeynikov | e201190 | 2008-04-23 18:15:11 +0000 | [diff] [blame] | 1029 | } else if ((RetOpcode == X86::RET || RetOpcode == X86::RETI) && |
Arnold Schwaighofer | c85e171 | 2007-10-11 19:40:01 +0000 | [diff] [blame] | 1030 | (X86FI->getTCReturnAddrDelta() < 0)) { |
| 1031 | // Add the return addr area delta back since we are not tail calling. |
| 1032 | int delta = -1*X86FI->getTCReturnAddrDelta(); |
| 1033 | MBBI = prior(MBB.end()); |
| 1034 | // Check for possible merge with preceeding ADD instruction. |
| 1035 | delta += mergeSPUpdates(MBB, MBBI, StackPtr, true); |
| 1036 | emitSPUpdate(MBB, MBBI, StackPtr, delta, Is64Bit, TII); |
Evan Cheng | 5b3332c | 2007-07-17 18:40:47 +0000 | [diff] [blame] | 1037 | } |
Chris Lattner | 3c1c03d | 2002-12-28 20:32:28 +0000 | [diff] [blame] | 1038 | } |
| 1039 | |
Jim Laskey | 4188699 | 2006-04-07 16:34:46 +0000 | [diff] [blame] | 1040 | unsigned X86RegisterInfo::getRARegister() const { |
Anton Korobeynikov | 038082d | 2007-05-02 08:46:03 +0000 | [diff] [blame] | 1041 | if (Is64Bit) |
| 1042 | return X86::RIP; // Should have dwarf #16 |
| 1043 | else |
| 1044 | return X86::EIP; // Should have dwarf #8 |
Jim Laskey | 4188699 | 2006-04-07 16:34:46 +0000 | [diff] [blame] | 1045 | } |
| 1046 | |
Jim Laskey | a997918 | 2006-03-28 13:48:33 +0000 | [diff] [blame] | 1047 | unsigned X86RegisterInfo::getFrameRegister(MachineFunction &MF) const { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1048 | return hasFP(MF) ? FramePtr : StackPtr; |
Jim Laskey | f1d78e8 | 2006-03-23 18:12:57 +0000 | [diff] [blame] | 1049 | } |
| 1050 | |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1051 | void X86RegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves) |
| 1052 | const { |
Anton Korobeynikov | 0ff3ca4 | 2007-05-12 22:36:25 +0000 | [diff] [blame] | 1053 | // Calculate amount of bytes used for return address storing |
| 1054 | int stackGrowth = (Is64Bit ? -8 : -4); |
| 1055 | |
| 1056 | // Initial state of the frame pointer is esp+4. |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1057 | MachineLocation Dst(MachineLocation::VirtualFP); |
Anton Korobeynikov | 0ff3ca4 | 2007-05-12 22:36:25 +0000 | [diff] [blame] | 1058 | MachineLocation Src(StackPtr, stackGrowth); |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1059 | Moves.push_back(MachineMove(0, Dst, Src)); |
Anton Korobeynikov | 0ff3ca4 | 2007-05-12 22:36:25 +0000 | [diff] [blame] | 1060 | |
| 1061 | // Add return address to move list |
| 1062 | MachineLocation CSDst(StackPtr, stackGrowth); |
| 1063 | MachineLocation CSSrc(getRARegister()); |
| 1064 | Moves.push_back(MachineMove(0, CSDst, CSSrc)); |
Jim Laskey | 0e41094 | 2007-01-24 19:15:24 +0000 | [diff] [blame] | 1065 | } |
| 1066 | |
Jim Laskey | 62819f3 | 2007-02-21 22:54:50 +0000 | [diff] [blame] | 1067 | unsigned X86RegisterInfo::getEHExceptionRegister() const { |
| 1068 | assert(0 && "What is the exception register"); |
| 1069 | return 0; |
| 1070 | } |
| 1071 | |
| 1072 | unsigned X86RegisterInfo::getEHHandlerRegister() const { |
| 1073 | assert(0 && "What is the exception handler register"); |
| 1074 | return 0; |
| 1075 | } |
| 1076 | |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1077 | namespace llvm { |
Duncan Sands | 83ec4b6 | 2008-06-06 12:08:01 +0000 | [diff] [blame] | 1078 | unsigned getX86SubSuperRegister(unsigned Reg, MVT VT, bool High) { |
| 1079 | switch (VT.getSimpleVT()) { |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1080 | default: return Reg; |
| 1081 | case MVT::i8: |
| 1082 | if (High) { |
| 1083 | switch (Reg) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1084 | default: return 0; |
| 1085 | 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] | 1086 | return X86::AH; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1087 | 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] | 1088 | return X86::DH; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1089 | 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] | 1090 | return X86::CH; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1091 | 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] | 1092 | return X86::BH; |
| 1093 | } |
| 1094 | } else { |
| 1095 | switch (Reg) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1096 | default: return 0; |
| 1097 | 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] | 1098 | return X86::AL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1099 | 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] | 1100 | return X86::DL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1101 | 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] | 1102 | return X86::CL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1103 | 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] | 1104 | return X86::BL; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1105 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
| 1106 | return X86::SIL; |
| 1107 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
| 1108 | return X86::DIL; |
| 1109 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
| 1110 | return X86::BPL; |
| 1111 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
| 1112 | return X86::SPL; |
| 1113 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1114 | return X86::R8B; |
| 1115 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1116 | return X86::R9B; |
| 1117 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1118 | return X86::R10B; |
| 1119 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1120 | return X86::R11B; |
| 1121 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1122 | return X86::R12B; |
| 1123 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1124 | return X86::R13B; |
| 1125 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1126 | return X86::R14B; |
| 1127 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1128 | return X86::R15B; |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1129 | } |
| 1130 | } |
| 1131 | case MVT::i16: |
| 1132 | switch (Reg) { |
| 1133 | default: return Reg; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1134 | 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] | 1135 | return X86::AX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1136 | 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] | 1137 | return X86::DX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1138 | 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] | 1139 | return X86::CX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1140 | 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] | 1141 | return X86::BX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1142 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1143 | return X86::SI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1144 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1145 | return X86::DI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1146 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1147 | return X86::BP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1148 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1149 | return X86::SP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1150 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1151 | return X86::R8W; |
| 1152 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1153 | return X86::R9W; |
| 1154 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1155 | return X86::R10W; |
| 1156 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1157 | return X86::R11W; |
| 1158 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1159 | return X86::R12W; |
| 1160 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1161 | return X86::R13W; |
| 1162 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1163 | return X86::R14W; |
| 1164 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1165 | return X86::R15W; |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1166 | } |
| 1167 | case MVT::i32: |
| 1168 | switch (Reg) { |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1169 | default: return Reg; |
| 1170 | 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] | 1171 | return X86::EAX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1172 | 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] | 1173 | return X86::EDX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1174 | 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] | 1175 | return X86::ECX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1176 | 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] | 1177 | return X86::EBX; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1178 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1179 | return X86::ESI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1180 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1181 | return X86::EDI; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1182 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1183 | return X86::EBP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1184 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1185 | return X86::ESP; |
Evan Cheng | 25ab690 | 2006-09-08 06:48:29 +0000 | [diff] [blame] | 1186 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1187 | return X86::R8D; |
| 1188 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1189 | return X86::R9D; |
| 1190 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1191 | return X86::R10D; |
| 1192 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1193 | return X86::R11D; |
| 1194 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1195 | return X86::R12D; |
| 1196 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1197 | return X86::R13D; |
| 1198 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1199 | return X86::R14D; |
| 1200 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1201 | return X86::R15D; |
| 1202 | } |
| 1203 | case MVT::i64: |
| 1204 | switch (Reg) { |
| 1205 | default: return Reg; |
| 1206 | case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX: |
| 1207 | return X86::RAX; |
| 1208 | case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX: |
| 1209 | return X86::RDX; |
| 1210 | case X86::CH: case X86::CL: case X86::CX: case X86::ECX: case X86::RCX: |
| 1211 | return X86::RCX; |
| 1212 | case X86::BH: case X86::BL: case X86::BX: case X86::EBX: case X86::RBX: |
| 1213 | return X86::RBX; |
| 1214 | case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI: |
| 1215 | return X86::RSI; |
| 1216 | case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI: |
| 1217 | return X86::RDI; |
| 1218 | case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP: |
| 1219 | return X86::RBP; |
| 1220 | case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP: |
| 1221 | return X86::RSP; |
| 1222 | case X86::R8B: case X86::R8W: case X86::R8D: case X86::R8: |
| 1223 | return X86::R8; |
| 1224 | case X86::R9B: case X86::R9W: case X86::R9D: case X86::R9: |
| 1225 | return X86::R9; |
| 1226 | case X86::R10B: case X86::R10W: case X86::R10D: case X86::R10: |
| 1227 | return X86::R10; |
| 1228 | case X86::R11B: case X86::R11W: case X86::R11D: case X86::R11: |
| 1229 | return X86::R11; |
| 1230 | case X86::R12B: case X86::R12W: case X86::R12D: case X86::R12: |
| 1231 | return X86::R12; |
| 1232 | case X86::R13B: case X86::R13W: case X86::R13D: case X86::R13: |
| 1233 | return X86::R13; |
| 1234 | case X86::R14B: case X86::R14W: case X86::R14D: case X86::R14: |
| 1235 | return X86::R14; |
| 1236 | case X86::R15B: case X86::R15W: case X86::R15D: case X86::R15: |
| 1237 | return X86::R15; |
Evan Cheng | 8f7f712 | 2006-05-05 05:40:20 +0000 | [diff] [blame] | 1238 | } |
| 1239 | } |
| 1240 | |
| 1241 | return Reg; |
| 1242 | } |
| 1243 | } |
| 1244 | |
Chris Lattner | 7ad3e06 | 2003-08-03 15:48:14 +0000 | [diff] [blame] | 1245 | #include "X86GenRegisterInfo.inc" |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1246 | |
| 1247 | namespace { |
| 1248 | struct VISIBILITY_HIDDEN MSAC : public MachineFunctionPass { |
| 1249 | static char ID; |
Dan Gohman | ae73dc1 | 2008-09-04 17:05:41 +0000 | [diff] [blame] | 1250 | MSAC() : MachineFunctionPass(&ID) {} |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1251 | |
| 1252 | virtual bool runOnMachineFunction(MachineFunction &MF) { |
| 1253 | MachineFrameInfo *FFI = MF.getFrameInfo(); |
Anton Korobeynikov | d52bdaf | 2008-04-23 18:23:30 +0000 | [diff] [blame] | 1254 | MachineRegisterInfo &RI = MF.getRegInfo(); |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1255 | |
Anton Korobeynikov | d52bdaf | 2008-04-23 18:23:30 +0000 | [diff] [blame] | 1256 | // Calculate max stack alignment of all already allocated stack objects. |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1257 | unsigned MaxAlign = calculateMaxStackAlignment(FFI); |
| 1258 | |
Anton Korobeynikov | d52bdaf | 2008-04-23 18:23:30 +0000 | [diff] [blame] | 1259 | // Be over-conservative: scan over all vreg defs and find, whether vector |
| 1260 | // registers are used. If yes - there is probability, that vector register |
| 1261 | // will be spilled and thus stack needs to be aligned properly. |
| 1262 | for (unsigned RegNum = TargetRegisterInfo::FirstVirtualRegister; |
| 1263 | RegNum < RI.getLastVirtReg(); ++RegNum) |
| 1264 | MaxAlign = std::max(MaxAlign, RI.getRegClass(RegNum)->getAlignment()); |
| 1265 | |
Anton Korobeynikov | 856914f | 2008-04-23 18:23:05 +0000 | [diff] [blame] | 1266 | FFI->setMaxAlignment(MaxAlign); |
| 1267 | |
| 1268 | return false; |
| 1269 | } |
| 1270 | |
| 1271 | virtual const char *getPassName() const { |
| 1272 | return "X86 Maximal Stack Alignment Calculator"; |
| 1273 | } |
| 1274 | }; |
| 1275 | |
| 1276 | char MSAC::ID = 0; |
| 1277 | } |
| 1278 | |
| 1279 | FunctionPass* |
| 1280 | llvm::createX86MaxStackAlignmentCalculatorPass() { return new MSAC(); } |