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Fix nasty mingw32 bug, which e.g. prevented llvm-gcc bootstrap there.

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Mark _alloca call as clobberring EFLAGS, otherwise some DCE might remove
other flags-clobberring stuff (e.g. cmp instructions) occuring after
_alloca call.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112034 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2010-08-25 07:50:11 +00:00
parent dc3d8b812f
commit 9f7f83b861
3 changed files with 10 additions and 6 deletions
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3
lib/Target/X86/X86ISelLowering.cpp
View File

@ -8930,7 +8930,8 @@ X86TargetLowering::EmitLoweredMingwAlloca(MachineInstr *MI,
.addReg(X86::EAX, RegState::Implicit)
.addReg(X86::ESP, RegState::Implicit)
.addReg(X86::EAX, RegState::Define | RegState::Implicit)
.addReg(X86::ESP, RegState::Define | RegState::Implicit);
.addReg(X86::ESP, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;

7
lib/Target/X86/X86InstrInfo.td
View File

@ -580,9 +580,10 @@ def VASTART_SAVE_XMM_REGS : I<0, Pseudo,
// The main point of having separate instruction are extra unmodelled effects
// (compared to ordinary calls) like stack pointer change.
def MINGW_ALLOCA : I<0, Pseudo, (outs), (ins),
"# dynamic stack allocation",
[(X86MingwAlloca)]>;
let Defs = [EAX, ESP, EFLAGS], Uses = [ESP] in
def MINGW_ALLOCA : I<0, Pseudo, (outs), (ins),
"# dynamic stack allocation",
[(X86MingwAlloca)]>;
}
// Nop

6
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -1109,7 +1109,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
.addImm(NumBytes);
BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
.addExternalSymbol("_alloca")
.addReg(StackPtr, RegState::Define | RegState::Implicit);
.addReg(StackPtr, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
} else {
// Save EAX
BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
@ -1121,7 +1122,8 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
.addImm(NumBytes - 4);
BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
.addExternalSymbol("_alloca")
.addReg(StackPtr, RegState::Define | RegState::Implicit);
.addReg(StackPtr, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
// Restore EAX
MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),