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Missed the case where alloca is used but the stack size (not including callee-saved portion) is zero. Thanks Dan.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@39974 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-07-17 18:03:34 +00:00
parent 969c44481b
commit f27795d174
1 changed files with 18 additions and 18 deletions
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36
lib/Target/X86/X86RegisterInfo.cpp
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@ -1340,25 +1340,25 @@ void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
addReg(DestAddr.getReg());
}
// Skip the callee-saved pop instructions.
while (MBBI != MBB.begin()) {
MachineBasicBlock::iterator PI = prior(MBBI);
if (PI->getOpcode() != X86::POP32r && PI->getOpcode() != X86::POP64r)
break;
--MBBI;
}
// If dynamic alloca is used, then reset esp to point to the last
// callee-saved slot before popping them off!
if (MFI->hasVarSizedObjects()) {
unsigned Opc = Is64Bit ? X86::LEA64r : X86::LEA32r;
MachineInstr *MI = addRegOffset(BuildMI(TII.get(Opc), StackPtr),
FramePtr, -CSSize);
MBB.insert(MBBI, MI);
return;
}
if (NumBytes) { // adjust stack pointer back: ESP += numbytes
// Skip the callee-saved pop instructions.
while (MBBI != MBB.begin()) {
MachineBasicBlock::iterator PI = prior(MBBI);
if (PI->getOpcode() != X86::POP32r && PI->getOpcode() != X86::POP64r)
break;
--MBBI;
}
// If dynamic alloca is used, then reset esp to point to the last
// callee-saved slot before popping them off!
if (MFI->hasVarSizedObjects()) {
unsigned Opc = Is64Bit ? X86::LEA64r : X86::LEA32r;
MachineInstr *MI = addRegOffset(BuildMI(TII.get(Opc), StackPtr),
FramePtr, -CSSize);
MBB.insert(MBBI, MI);
return;
}
// If there is an ADD32ri or SUB32ri of ESP immediately before this
// instruction, merge the two instructions.
if (MBBI != MBB.begin()) {