Changes in directory llvm/lib/Target/X86:
X86ISelDAGToDAG.cpp updated: 1.54 -> 1.55
---
Log message:
Don't match x << 1 to LEAL. It's better to emit x + x.
---
Diffs of the changes: (+4 -1)
X86ISelDAGToDAG.cpp | 5 ++++-
1 files changed, 4 insertions(+), 1 deletion(-)
Index: llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
diff -u llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:1.54
llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:1.55
--- llvm/lib/Target/X86/X86ISelDAGToDAG.cpp:1.54 Sat Feb 25 04:09:08 2006
+++ llvm/lib/Target/X86/X86ISelDAGToDAG.cpp Tue Feb 28 15:13:57 2006
@@ -453,8 +453,11 @@
else
AM.IndexReg = CurDAG->getRegister(0, MVT::i32);
- if (AM.Scale > 1)
+ if (AM.Scale > 2)
Complexity += 2;
+ // Don't match just leal(,%reg,2). It's cheaper to do addl %reg, %reg
+ else if (AM.Scale > 1)
+ Complexity++;
// FIXME: We are artificially lowering the criteria to turn ADD %reg, $GA
// to a LEA. This is determined with some expermentation but is by no means
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