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Don't spill LR as a callee saved register.

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llvm-svn: 34533
This commit is contained in:
Jim Laskey 2007-02-23 20:34:16 +00:00
parent 7c2f17b629
commit 704423b797
3 changed files with 19 additions and 2 deletions
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7
lib/Target/PowerPC/PPCMachineFunctionInfo.h
View File

@ -26,6 +26,10 @@ private:
/// stored. Also used as an anchor for instructions that need to be altered
/// when using frame pointers (dyna_add, dyna_sub.)
int FramePointerSaveIndex;
/// UsesLR - Indicates whether LR is used in the current function.
///
bool UsesLR;
public:
PPCFunctionInfo(MachineFunction& MF)
@ -34,6 +38,9 @@ public:
int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
void setUsesLR(bool U) { UsesLR = U; }
bool usesLR() { return UsesLR; }
};

13
lib/Target/PowerPC/PPCRegisterInfo.cpp
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@ -439,8 +439,8 @@ bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
/// usesLR - Returns if the link registers (LR) has been used in the function.
///
bool PPCRegisterInfo::usesLR(MachineFunction &MF) const {
const bool *PhysRegsUsed = MF.getUsedPhysregs();
return PhysRegsUsed[getRARegister()];
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
return FI->usesLR();
}
void PPCRegisterInfo::
@ -774,6 +774,15 @@ void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
MFI->setStackSize(FrameSize);
}
void PPCRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF)
const {
// Save and clear the LR state.
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
unsigned LR = getRARegister();
FI->setUsesLR(MF.isPhysRegUsed(LR));
MF.changePhyRegUsed(LR, false);
}
void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();

1
lib/Target/PowerPC/PPCRegisterInfo.h
View File

@ -82,6 +82,7 @@ public:
/// frame size.
void determineFrameLayout(MachineFunction &MF) const;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF) const;
void emitPrologue(MachineFunction &MF) const;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;