[llvm-commits] CVS: llvm/lib/Target/X86/X86InstrInfo.cpp

[Chris Lattner]

Changes in directory llvm/lib/Target/X86:

X86InstrInfo.cpp updated: 1.33 -> 1.34
---
Log message:

Disable 2->3 address promotion of add and inc instructions to LEA's.  In
addition to being three address, LEA's don't set the flags.

This fixes 186.crafty.


---
Diffs of the changes:  (+5 -0)

Index: llvm/lib/Target/X86/X86InstrInfo.cpp
diff -u llvm/lib/Target/X86/X86InstrInfo.cpp:1.33 llvm/lib/Target/X86/X86InstrInfo.cpp:1.34
--- llvm/lib/Target/X86/X86InstrInfo.cpp:1.33	Sat Jan  1 20:37:07 2005
+++ llvm/lib/Target/X86/X86InstrInfo.cpp	Sat Jan  1 22:18:17 2005
@@ -55,6 +55,11 @@
   unsigned Dest = MI->getOperand(0).getReg();
   unsigned Src = MI->getOperand(1).getReg();
 
+  // FIXME: None of these instructions are promotable to LEAs without 
+  // additional information.  In particular, LEA doesn't set the flags that 
+  // add and inc do.  :(
+  return 0;
+
   // FIXME: 16-bit LEA's are really slow on Athlons, but not bad on P4's.  When
   // we have subtarget support, enable the 16-bit LEA generation here.
   bool DisableLEA16 = true;