Here's a patch that fixes linux/PPC FramePointer. It reserves the offset
of the frame pointer before
calculating the offsets of callee saved registers.
OK to commit?
Index: PPCRegisterInfo.cpp
===================================================================
RCS file: /var/cvs/llvm/llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp,v
retrieving revision 1.114
diff -t -d -u -p -5 -r1.114 PPCRegisterInfo.cpp
--- PPCRegisterInfo.cpp 27 Feb 2007 11:55:45 -0000 1.114
+++ PPCRegisterInfo.cpp 27 Feb 2007 17:29:51 -0000
@@ -879,10 +879,30 @@ void PPCRegisterInfo::processFunctionBef
// Save and clear the LR state.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
unsigned LR = getRARegister();
FI->setUsesLR(MF.isPhysRegUsed(LR));
MF.changePhyRegUsed(LR, false);
+
+
+ // Save R31 if necessary
+ int FPSI = FI->getFramePointerSaveIndex();
+ bool IsPPC64 = Subtarget.isPPC64();
+ bool IsMachoABI = Subtarget.isMachoABI();
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+
+ // If the frame pointer save index hasn't been defined yet.
+ if (!FPSI && (NoFramePointerElim || MFI->hasVarSizedObjects())
+ && !IsMachoABI) {
+ // Find out what the fix offset of the frame pointer save area.
+ int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64,
+ IsMachoABI);
+ // Allocate the frame index for frame pointer save area.
+ FPSI = MF.getFrameInfo()->CreateFixedObject(IsPPC64? 8 : 4, FPOffset);
+ // Save the result.
+ FI->setFramePointerSaveIndex(FPSI);
+ }
+
}
void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
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