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Eastimate required stack alignment early, so we can decide, whether we will need frame pointer or not

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50161 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2008-04-23 18:20:17 +00:00
parent 874384e20f
commit b51dce3013
2 changed files with 21 additions and 0 deletions
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19
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -371,6 +371,25 @@ void X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
MI.getOperand(i+3).ChangeToImmediate(Offset);
}
void
X86RegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
MachineFrameInfo *FFI = MF.getFrameInfo();
// Calculate and set max stack object alignment early, so we can decide
// whether we will need stack realignment (and thus FP).
unsigned MaxAlign = 0;
for (int i = FFI->getObjectIndexBegin(),
e = FFI->getObjectIndexEnd(); i != e; ++i) {
if (FFI->isDeadObjectIndex(i))
continue;
unsigned Align = FFI->getObjectAlignment(i);
MaxAlign = std::max(MaxAlign, Align);
}
FFI->setMaxAlignment(MaxAlign);
}
void
X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF) const{
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();

2
lib/Target/X86/X86RegisterInfo.h
View File

@ -127,6 +127,8 @@ public:
int SPAdj, RegScavenger *RS = NULL) const;
void processFunctionBeforeFrameFinalized(MachineFunction &MF) const;
void processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS = NULL) const;
void emitPrologue(MachineFunction &MF) const;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const;