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[mips] Add function MipsFrameLowering::estimateStackSize.

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This function estimates stack size and will be called before
PrologEpilogInserter scans the callee-saved registers.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167313 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2012-11-02 21:10:22 +00:00
parent 294166d541
commit 265f191b57
2 changed files with 37 additions and 0 deletions
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34
lib/Target/Mips/MipsFrameLowering.cpp
View File

@ -98,3 +98,37 @@ bool MipsFrameLowering::hasFP(const MachineFunction &MF) const {
return MF.getTarget().Options.DisableFramePointerElim(MF) ||
MFI->hasVarSizedObjects() || MFI->isFrameAddressTaken();
}
uint64_t MipsFrameLowering::estimateStackSize(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
const TargetRegisterInfo &TRI = *MF.getTarget().getRegisterInfo();
int64_t Offset = 0;
// Iterate over fixed sized objects.
for (int I = MFI->getObjectIndexBegin(); I != 0; ++I)
Offset = std::max(Offset, -MFI->getObjectOffset(I));
// Conservatively assume all callee-saved registers will be saved.
for (const uint16_t *R = TRI.getCalleeSavedRegs(&MF); *R; ++R) {
unsigned Size = TRI.getMinimalPhysRegClass(*R)->getSize();
Offset = RoundUpToAlignment(Offset + Size, Size);
}
unsigned MaxAlign = MFI->getMaxAlignment();
// Check that MaxAlign is not zero if there is a stack object that is not a
// callee-saved spill.
assert(!MFI->getObjectIndexEnd() || MaxAlign);
// Iterate over other objects.
for (unsigned I = 0, E = MFI->getObjectIndexEnd(); I != E; ++I)
Offset = RoundUpToAlignment(Offset + MFI->getObjectSize(I), MaxAlign);
// Call frame.
if (MFI->adjustsStack() && hasReservedCallFrame(MF))
Offset = RoundUpToAlignment(Offset + MFI->getMaxCallFrameSize(),
std::max(MaxAlign, getStackAlignment()));
return RoundUpToAlignment(Offset, getStackAlignment());
}

3
lib/Target/Mips/MipsFrameLowering.h
View File

@ -34,6 +34,9 @@ public:
const MipsSubtarget &ST);
bool hasFP(const MachineFunction &MF) const;
protected:
uint64_t estimateStackSize(const MachineFunction &MF) const;
};
/// Create MipsInstrInfo objects.