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Fix the 'have a framepointer' case, so that the frame pointer always points

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to the old saved EBP.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11455 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-15 00:15:37 +00:00
parent 05d8350c12
commit 96c3d2e2e7
1 changed files with 10 additions and 8 deletions
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18
lib/Target/X86/X86RegisterInfo.cpp
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@ -144,6 +144,8 @@ void X86RegisterInfo::eliminateFrameIndex(MachineFunction &MF,
if (!hasFP(MF)) if (!hasFP(MF))
Offset += MF.getFrameInfo()->getStackSize(); Offset += MF.getFrameInfo()->getStackSize();
else
Offset += 4; // Skip the saved EBP
MI.SetMachineOperandConst(i+3, MachineOperand::MO_SignExtendedImmed, Offset); MI.SetMachineOperandConst(i+3, MachineOperand::MO_SignExtendedImmed, Offset);
} }
@ -152,9 +154,9 @@ void
X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF) const{ X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF) const{
if (hasFP(MF)) { if (hasFP(MF)) {
// Create a frame entry for the EBP register that must be saved. // Create a frame entry for the EBP register that must be saved.
int FrameIdx = MF.getFrameInfo()->CreateStackObject(4, 4); int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, -8);
assert(FrameIdx == MF.getFrameInfo()->getObjectIndexEnd()-1 && assert(FrameIdx == MF.getFrameInfo()->getObjectIndexBegin() &&
"Slot for EBP register must be last in order to be found!"); "Slot for EBP register must be last in order to be found!");
} }
} }
@ -169,7 +171,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
if (hasFP(MF)) { if (hasFP(MF)) {
// Get the offset of the stack slot for the EBP register... which is // Get the offset of the stack slot for the EBP register... which is
// guaranteed to be the last slot by processFunctionBeforeFrameFinalized. // guaranteed to be the last slot by processFunctionBeforeFrameFinalized.
int EBPOffset = MFI->getObjectOffset(MFI->getObjectIndexEnd()-1)+4; int EBPOffset = MFI->getObjectOffset(MFI->getObjectIndexBegin())+4;
if (NumBytes) { // adjust stack pointer: ESP -= numbytes if (NumBytes) { // adjust stack pointer: ESP -= numbytes
MI= BuildMI(X86::SUBri32, 1, X86::ESP, MOTy::UseAndDef).addZImm(NumBytes); MI= BuildMI(X86::SUBri32, 1, X86::ESP, MOTy::UseAndDef).addZImm(NumBytes);
@ -182,10 +184,10 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
// Update EBP with the new base value... // Update EBP with the new base value...
if (NumBytes == 0) // mov EBP, ESP if (NumBytes == 4) // mov EBP, ESP
MI = BuildMI(X86::MOVrr32, 2, X86::EBP).addReg(X86::ESP); MI = BuildMI(X86::MOVrr32, 2, X86::EBP).addReg(X86::ESP);
else // lea EBP, [ESP+StackSize] else // lea EBP, [ESP+StackSize]
MI = addRegOffset(BuildMI(X86::LEAr32, 5, X86::EBP), X86::ESP, NumBytes); MI = addRegOffset(BuildMI(X86::LEAr32, 5, X86::EBP), X86::ESP,NumBytes-4);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
@ -231,8 +233,8 @@ void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
MI = BuildMI(X86::MOVrr32, 1,X86::ESP).addReg(X86::EBP); MI = BuildMI(X86::MOVrr32, 1,X86::ESP).addReg(X86::EBP);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
// mov EBP, [ESP-<offset>] // pop EBP
MI = addRegOffset(BuildMI(X86::MOVmr32, 5, X86::EBP), X86::ESP, EBPOffset); MI = BuildMI(X86::POPr32, 0, X86::EBP);
MBB.insert(MBBI, MI); MBB.insert(MBBI, MI);
} else { } else {
// Get the number of bytes allocated from the FrameInfo... // Get the number of bytes allocated from the FrameInfo...