[llvm-commits] [llvm] r145952 - /llvm/trunk/lib/Target/X86/X86FrameLowering.cpp

[Bill Wendling]

Author: void
Date: Tue Dec  6 13:09:06 2011
New Revision: 145952

URL: http://llvm.org/viewvc/llvm-project?rev=145952&view=rev
Log:
For a small sized stack, we encode that value directly with no "stack adjust" value.

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=145952&r1=145951&r2=145952&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86FrameLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86FrameLowering.cpp Tue Dec  6 13:09:06 2011
@@ -565,7 +565,7 @@
     if ((FullOffset & 0xFF) == FullOffset) {
       // Frameless stack.
       CompactUnwindEncoding |= 0x02000000;
-      CompactUnwindEncoding |= (FullOffset & 0xFF) << 16;
+      CompactUnwindEncoding |= (CFAOffset & 0xFF) << 16;
     } else {
       if ((CFAOffset & 0x7) != CFAOffset)
         // The extra stack adjustments are too big for us to handle.
@@ -582,6 +582,8 @@
       CompactUnwindEncoding |= (CFAOffset & 0x7) << 13;
     }
 
+    CompactUnwindEncoding |= ((6 - SavedRegIdx) & 0x7) << 10;
+
     // Get the encoding of the saved registers when we don't have a frame
     // pointer.
     uint32_t RegEnc = encodeCompactUnwindRegistersWithoutFrame(SavedRegs,