The compact unwinding offsets are divided by 8 on 64-bit machines.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136065 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86FrameLowering.cpp b/lib/Target/X86/X86FrameLowering.cpp
index cdc8305..d5e9aa6 100644
--- a/lib/Target/X86/X86FrameLowering.cpp
+++ b/lib/Target/X86/X86FrameLowering.cpp
@@ -490,6 +490,8 @@
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 @@
// %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 @@
// 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.