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There is no reason to align the stack pointer if there are no callees of this 

function!

llvm-svn: 11450
This commit is contained in:
Chris Lattner 2004-02-14 20:11:07 +00:00
parent 612ce0c47c
commit f54cd1524d
1 changed files with 12 additions and 10 deletions
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22
llvm/lib/Target/X86/X86RegisterInfo.cpp
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@ -190,16 +190,18 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MBB.insert(MBBI, MI);
} else {
// 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.
//
NumBytes += MFI->getMaxCallFrameSize();
// Round the size to a multiple of the alignment (don't forget the 4 byte
// offset though).
unsigned Align = MF.getTarget().getFrameInfo().getStackAlignment();
NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
if (MFI->hasCalls()) {
// 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.
//
NumBytes += MFI->getMaxCallFrameSize();
// Round the size to a multiple of the alignment (don't forget the 4 byte
// offset though).
unsigned Align = MF.getTarget().getFrameInfo().getStackAlignment();
NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
}
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);