diff options
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCFrameLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCFrameLowering.cpp | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp index 95143d54c7e..b9aeba13fd8 100644 --- a/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp +++ b/llvm/lib/Target/PowerPC/PPCFrameLowering.cpp @@ -355,20 +355,6 @@ static bool hasNonRISpills(const MachineFunction &MF) { return FuncInfo->hasNonRISpills(); } -/// 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, unsigned LR) { - const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>(); - - // We need a save/restore of LR if there is any def of LR (which is - // defined by calls, including the PIC setup sequence), or if there is - // some use of the LR stack slot (e.g. for builtin_return_address). - // (LR comes in 32 and 64 bit versions.) - MachineRegisterInfo::def_iterator RI = MF.getRegInfo().def_begin(LR); - return RI !=MF.getRegInfo().def_end() || MFI->isLRStoreRequired(); -} - /// determineFrameLayout - Determine the size of the frame and maximum call /// frame size. unsigned PPCFrameLowering::determineFrameLayout(MachineFunction &MF, @@ -395,7 +381,6 @@ unsigned PPCFrameLowering::determineFrameLayout(MachineFunction &MF, // stackless code if all local vars are reg-allocated. bool DisableRedZone = MF.getFunction()->getAttributes(). hasAttribute(AttributeSet::FunctionIndex, Attribute::NoRedZone); - unsigned LR = RegInfo->getRARegister(); if (!DisableRedZone && (Subtarget.isPPC64() || // 32-bit SVR4, no stack- !Subtarget.isSVR4ABI() || // allocated locals. @@ -403,7 +388,6 @@ unsigned PPCFrameLowering::determineFrameLayout(MachineFunction &MF, FrameSize <= 224 && // Fits in red zone. !MFI->hasVarSizedObjects() && // No dynamic alloca. !MFI->adjustsStack() && // No calls. - !MustSaveLR(MF, LR) && !RegInfo->hasBasePointer(MF)) { // No special alignment. // No need for frame if (UpdateMF) @@ -1124,6 +1108,20 @@ void PPCFrameLowering::emitEpilogue(MachineFunction &MF, } } +/// 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, unsigned LR) { + const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>(); + + // We need a save/restore of LR if there is any def of LR (which is + // defined by calls, including the PIC setup sequence), or if there is + // some use of the LR stack slot (e.g. for builtin_return_address). + // (LR comes in 32 and 64 bit versions.) + MachineRegisterInfo::def_iterator RI = MF.getRegInfo().def_begin(LR); + return RI !=MF.getRegInfo().def_end() || MFI->isLRStoreRequired(); +} + void PPCFrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF, RegScavenger *) const { |
