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Backend is reponsible for aligning the stack. 

llvm-svn: 33388
This commit is contained in:
Evan Cheng 2007-01-20 02:08:16 +00:00
parent 7ab6fa3a67
commit 86468ccaf3
1 changed files with 5 additions and 7 deletions
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12
llvm/lib/Target/X86/X86RegisterInfo.cpp
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@ -997,18 +997,16 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
// Get the number of bytes to allocate from the FrameInfo
unsigned NumBytes = MFI->getStackSize();
if (MFI->hasCalls() || MF.getFrameInfo()->hasVarSizedObjects()) {
if (MFI->hasCalls() && !hasFP(MF))
// When we have no frame pointer, we reserve argument space for call sites
// in the function immediately on entry to the current function. This
// eliminates the need for add/sub ESP brackets around call sites.
//
if (!hasFP(MF))
NumBytes += MFI->getMaxCallFrameSize();
NumBytes += MFI->getMaxCallFrameSize();
// Round the size to a multiple of the alignment (don't forget the 4/8 byte
// offset though).
NumBytes = ((NumBytes+SlotSize)+Align-1)/Align*Align - SlotSize;
}
// Round the size to a multiple of the alignment (don't forget the 4/8 byte
// offset though).
NumBytes = ((NumBytes+SlotSize)+Align-1)/Align*Align - SlotSize;
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);