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Darwin ABI requires FP to point to stack slot of prev FP. 

llvm-svn: 33724
This commit is contained in:
Evan Cheng 2007-01-31 22:25:33 +00:00
parent 2e309b15a7
commit 6f1c20a8e6
1 changed files with 14 additions and 3 deletions
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17
llvm/lib/Target/ARM/ARMRegisterInfo.cpp
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@ -900,6 +900,13 @@ processFunctionBeforeCalleeSavedScan(MachineFunction &MF) const {
ForceLRSpill = false;
}
// Darwin ABI requires FP to point to the stack slot that contains the
// previous FP.
if (STI.isTargetDarwin()) {
MF.changePhyRegUsed(FramePtr, true);
NumGPRSpills++;
}
// If stack and double are 8-byte aligned and we are spilling an odd number
// of GPRs. Spill one extra callee save GPR so we won't have to pad between
// the integer and double callee save areas.
@ -1029,8 +1036,9 @@ void ARMRegisterInfo::emitPrologue(MachineFunction &MF) const {
} else if (MBBI != MBB.end() && MBBI->getOpcode() == ARM::tPUSH)
++MBBI;
// Point FP to the stack slot that contains the previous FP.
if (hasFP(MF))
// Darwin ABI requires FP to point to the stack slot that contains the
// previous FP.
if (STI.isTargetDarwin() || hasFP(MF))
BuildMI(MBB, MBBI, TII.get(isThumb ? ARM::tADDrSPi : ARM::ADDri), FramePtr)
.addFrameIndex(FramePtrSpillFI).addImm(0);
@ -1116,7 +1124,9 @@ void ARMRegisterInfo::emitEpilogue(MachineFunction &MF,
if (isThumb)
emitSPUpdate(MBB, MBBI, NumBytes, isThumb, TII);
else {
if (hasFP(MF)){
// Darwin ABI requires FP to point to the stack slot that contains the
// previous FP.
if (STI.isTargetDarwin() || hasFP(MF)) {
NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
// Reset SP based on frame pointer only if the stack frame extends beyond
// frame pointer stack slot.
@ -1131,6 +1141,7 @@ void ARMRegisterInfo::emitEpilogue(MachineFunction &MF,
} else if (NumBytes) {
emitSPUpdate(MBB, MBBI, NumBytes, false, TII);
}
// Move SP to start of integer callee save spill area 2.
movePastCSLoadStoreOps(MBB, MBBI, ARM::FLDD, 3, STI);
emitSPUpdate(MBB, MBBI, AFI->getDPRCalleeSavedAreaSize(), false, TII);