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There is no reason to align the stack pointer if there are no callees of this
function! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11450 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -190,16 +190,18 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
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MBB.insert(MBBI, MI);
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} else {
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// When we have no frame pointer, we reserve argument space for call sites
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// in the function immediately on entry to the current function. This
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// eliminates the need for add/sub ESP brackets around call sites.
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//
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NumBytes += MFI->getMaxCallFrameSize();
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// Round the size to a multiple of the alignment (don't forget the 4 byte
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// offset though).
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unsigned Align = MF.getTarget().getFrameInfo().getStackAlignment();
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NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
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if (MFI->hasCalls()) {
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// When we have no frame pointer, we reserve argument space for call sites
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// in the function immediately on entry to the current function. This
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// eliminates the need for add/sub ESP brackets around call sites.
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//
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NumBytes += MFI->getMaxCallFrameSize();
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// Round the size to a multiple of the alignment (don't forget the 4 byte
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// offset though).
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unsigned Align = MF.getTarget().getFrameInfo().getStackAlignment();
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NumBytes = ((NumBytes+4)+Align-1)/Align*Align - 4;
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}
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// Update frame info to pretend that this is part of the stack...
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MFI->setStackSize(NumBytes);
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