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The compact unwinding offsets are divided by 8 on 64-bit machines. 

llvm-svn: 136065
This commit is contained in:
Bill Wendling 2011-07-26 08:03:49 +00:00
parent dd7805a24d
commit ee61946783
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/Target/X86/X86FrameLowering.cpp
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@ -490,6 +490,8 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
unsigned SubtractInstr = getSUBriOpcode(Is64Bit, -TailCallReturnAddrDelta);
unsigned SubtractInstrIdx = (Is64Bit ? 3 : 2);
unsigned StackDivide = (Is64Bit ? 8 : 4);
unsigned InstrOffset = 0;
unsigned CFAOffset = 0;
unsigned StackAdjust = 0;
@ -536,7 +538,7 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
// %RSP<def> = SUB64ri8 %RSP, 48
return 0;
StackAdjust = MI.getOperand(2).getImm() / 4;
StackAdjust = MI.getOperand(2).getImm() / StackDivide;
SubtractInstrIdx += InstrOffset;
ExpectEnd = true;
}
@ -544,7 +546,7 @@ uint32_t X86FrameLowering::getCompactUnwindEncoding(MachineFunction &MF) const {
// Encode that we are using EBP/RBP as the frame pointer.
uint32_t CompactUnwindEncoding = 0;
CFAOffset /= 4;
CFAOffset /= StackDivide;
if (HasFP) {
if ((CFAOffset & 0xFF) != CFAOffset)
// Offset was too big for compact encoding.