[llvm-commits] [llvm] r136065 - /llvm/trunk/lib/Target/X86/X86FrameLowering.cpp

[Bill Wendling]

Author: void
Date: Tue Jul 26 03:03:49 2011
New Revision: 136065

URL: http://llvm.org/viewvc/llvm-project?rev=136065&view=rev
Log:
The compact unwinding offsets are divided by 8 on 64-bit machines.

Modified:
    llvm/trunk/lib/Target/X86/X86FrameLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86FrameLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86FrameLowering.cpp?rev=136065&r1=136064&r2=136065&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86FrameLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86FrameLowering.cpp Tue Jul 26 03:03:49 2011
@@ -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.