diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index ac1b4ef0b3..477267ad56 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -991,6 +991,7 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const { MachineBasicBlock::iterator MBBI = MBB.begin(); MachineFrameInfo *MFI = MF.getFrameInfo(); unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment(); + unsigned AlignMask = Align - 1; const Function* Fn = MF.getFunction(); const X86Subtarget* Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>(); MachineInstr *MI; @@ -1004,9 +1005,11 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF) const { // 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 pushed by the caller though). No need to align the stack if this + // is a leaf function. + NumBytes = (((NumBytes+SlotSize) + AlignMask) & ~AlignMask) - SlotSize; + } // Update frame info to pretend that this is part of the stack... MFI->setStackSize(NumBytes); |