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For Thumb2, try to use frame pointer references for stack slots even when a

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base register is available. rdar://8525298

llvm-svn: 116729
This commit is contained in:
Jim Grosbach 2010-10-18 18:39:46 +00:00
parent 7cc236c87f
commit ffb06eda57
1 changed files with 10 additions and 2 deletions
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12
lib/Target/ARM/ARMBaseRegisterInfo.cpp
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@ -953,8 +953,16 @@ ARMBaseRegisterInfo::ResolveFrameIndexReference(const MachineFunction &MF,
return FPOffset;
} else if (MFI->hasVarSizedObjects()) {
assert(hasBasePointer(MF) && "missing base pointer!");
// Use the base register since we have it.
FrameReg = BasePtr;
// Try to use the frame pointer if we can, else use the base pointer
// since it's available. This is handy for the emergency spill slot, in
// particular.
if (AFI->isThumb2Function()) {
if (FPOffset >= -255 && FPOffset < 0) {
FrameReg = getFrameRegister(MF);
return FPOffset;
}
} else
FrameReg = BasePtr;
} else if (AFI->isThumb2Function()) {
// In Thumb2 mode, the negative offset is very limited. Try to avoid
// out of range references.