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x86: check hasOpaqueSPAdjustment in canRealignStack

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Summary:
@rnk pointed out in [1] that x86's canRealignStack logic should match that in CantUseSP from hasBasePointer.

  [1]: http://reviews.llvm.org/D11160?id=29713#inline-89350

Reviewers: rnk

Subscribers: rnk, llvm-commits

Differential Revision: http://reviews.llvm.org/D11377

llvm-svn: 243772
This commit is contained in:
JF Bastien 2015-07-31 18:28:09 +00:00
parent aedfc1e57b
commit 31beeeca0e
1 changed files with 6 additions and 4 deletions
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10
lib/Target/X86/X86RegisterInfo.cpp
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@ -433,6 +433,10 @@ void X86RegisterInfo::adjustStackMapLiveOutMask(uint32_t *Mask) const {
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
static bool CantUseSP(const MachineFrameInfo *MFI) {
return MFI->hasVarSizedObjects() || MFI->hasOpaqueSPAdjustment();
}
bool X86RegisterInfo::hasBasePointer(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
@ -445,9 +449,7 @@ bool X86RegisterInfo::hasBasePointer(const MachineFunction &MF) const {
// reference locals while also adjusting the stack pointer. When we can't
// use both the SP and the FP, we need a separate base pointer register.
bool CantUseFP = needsStackRealignment(MF);
bool CantUseSP =
MFI->hasVarSizedObjects() || MFI->hasOpaqueSPAdjustment();
return CantUseFP && CantUseSP;
return CantUseFP && CantUseSP(MFI);
}
bool X86RegisterInfo::canRealignStack(const MachineFunction &MF) const {
@ -464,7 +466,7 @@ bool X86RegisterInfo::canRealignStack(const MachineFunction &MF) const {
// If a base pointer is necessary. Check that it isn't too late to reserve
// it.
if (MFI->hasVarSizedObjects())
if (CantUseSP(MFI))
return MRI->canReserveReg(BasePtr);
return true;
}