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Last check-in was bogus. There is no need to align the stack if the function is a leaf function (and without alloca).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33399 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2007-01-20 10:11:56 +00:00
parent 597a3bde35
commit 5ad334fbda
1 changed files with 6 additions and 3 deletions
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9
lib/Target/X86/X86RegisterInfo.cpp
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@ -991,6 +991,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock::iterator MBBI = MBB.begin(); MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo(); MachineFrameInfo *MFI = MF.getFrameInfo();
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment(); unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
unsigned AlignMask = Align - 1;
const Function* Fn = MF.getFunction(); const Function* Fn = MF.getFunction();
const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>(); const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
MachineInstr *MI; MachineInstr *MI;
@ -1004,9 +1005,11 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
// //
NumBytes += MFI->getMaxCallFrameSize(); NumBytes += MFI->getMaxCallFrameSize();
// Round the size to a multiple of the alignment (don't forget the 4/8 byte // Round the size to a multiple of the alignment (don't forget the 4/8 byte
// offset though). // offset pushed by the caller though). No need to align the stack if this
NumBytes = ((NumBytes+SlotSize)+Align-1)/Align*Align - SlotSize; // is a leaf function.
NumBytes = (((NumBytes+SlotSize) + AlignMask) & ~AlignMask) - SlotSize;
}
// Update frame info to pretend that this is part of the stack... // Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes); MFI->setStackSize(NumBytes);