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refactor some code to avoid overloading the name 'usesLR' in

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different places to mean different things.  Document what the
one in PPCFunctionInfo means and when it is valid.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44699 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2007-12-08 06:39:11 +00:00
parent edfd10de87
commit 73944fb222
3 changed files with 14 additions and 12 deletions
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16
lib/Target/PowerPC/PPCRegisterInfo.cpp
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@@ -645,11 +645,13 @@ bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
return MFI->getStackSize() && needsFP(MF);
}
/// usesLR - Returns if the link registers (LR) has been used in the function.
///
bool PPCRegisterInfo::usesLR(MachineFunction &MF) const {
PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
return FI->usesLR();
/// MustSaveLR - Return true if this function requires that we save the LR
/// register onto the stack in the prolog and restore it in the epilog of the function.
static bool MustSaveLR(const MachineFunction &MF) {
return MF.getInfo<PPCFunctionInfo>()->usesLR() ||
// FIXME: Anything that has a call should clobber the LR register,
// isn't this redundant??
MF.getFrameInfo()->hasCalls();
}
void PPCRegisterInfo::
@@ -1062,7 +1064,7 @@ void PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Get operating system
bool IsMachoABI = Subtarget.isMachoABI();
// Check if the link register (LR) has been used.
bool UsesLR = MFI->hasCalls() || usesLR(MF);
bool UsesLR = MustSaveLR(MF);
// Do we have a frame pointer for this function?
bool HasFP = hasFP(MF) && FrameSize;
@@ -1226,7 +1228,7 @@ void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
// Get operating system
bool IsMachoABI = Subtarget.isMachoABI();
// Check if the link register (LR) has been used.
bool UsesLR = MFI->hasCalls() || usesLR(MF);
bool UsesLR = MustSaveLR(MF);
// Do we have a frame pointer for this function?
bool HasFP = hasFP(MF) && FrameSize;