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Duplicate use of LR, take 2.

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llvm-svn: 34666
This commit is contained in:
Jim Laskey 2007-02-27 11:55:45 +00:00
parent 5d71b78293
commit f5b5a3cf77
3 changed files with 42 additions and 26 deletions
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7
lib/Target/PowerPC/PPCMachineFunctionInfo.h
View File

@ -27,6 +27,10 @@ private:
/// 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)
: FramePointerSaveIndex(0)
@ -35,6 +39,9 @@ public:
int getFramePointerSaveIndex() const { return FramePointerSaveIndex; }
void setFramePointerSaveIndex(int Idx) { FramePointerSaveIndex = Idx; }
void setUsesLR(bool U) { UsesLR = U; }
bool usesLR() { return UsesLR; }
};
} // end of namespace llvm

28
lib/Target/PowerPC/PPCRegisterInfo.cpp
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@ -538,8 +538,8 @@ 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::
@ -874,6 +874,15 @@ 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();
@ -899,9 +908,6 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
determineFrameLayout(MF);
unsigned FrameSize = MFI->getStackSize();
// Skip if a leaf routine.
if (!FrameSize) return;
int NegFrameSize = -FrameSize;
// Get processor type.
@ -911,7 +917,7 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Check if the link register (LR) has been used.
bool UsesLR = MFI->hasCalls() || usesLR(MF);
// Do we have a frame pointer for this function?
bool HasFP = hasFP(MF);
bool HasFP = hasFP(MF) && FrameSize;
int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
@ -940,6 +946,9 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
.addReg(PPC::R0).addImm(LROffset).addReg(PPC::R1);
}
// Skip if a leaf routine.
if (!FrameSize) return;
// Get stack alignments.
unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
unsigned MaxAlign = MFI->getMaxAlignment();
@ -1065,8 +1074,6 @@ void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
// Get the number of bytes allocated from the FrameInfo.
unsigned FrameSize = MFI->getStackSize();
if (!FrameSize) return;
// Get processor type.
bool IsPPC64 = Subtarget.isPPC64();
// Get operating system
@ -1074,11 +1081,12 @@ void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
// Check if the link register (LR) has been used.
bool UsesLR = MFI->hasCalls() || usesLR(MF);
// Do we have a frame pointer for this function?
bool HasFP = hasFP(MF);
bool HasFP = hasFP(MF) && FrameSize;
int LROffset = PPCFrameInfo::getReturnSaveOffset(IsPPC64, IsMachoABI);
int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(IsPPC64, IsMachoABI);
if (FrameSize) {
// The loaded (or persistent) stack pointer value is offset by the 'stwu'
// on entry to the function. Add this offset back now.
if (!Subtarget.isPPC64()) {
@ -1098,7 +1106,7 @@ void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
BuildMI(MBB, MBBI, TII.get(PPC::LD), PPC::X1).addImm(0).addReg(PPC::X1);
}
}
}
if (IsPPC64) {
if (UsesLR)

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;