Changes in directory llvm/lib/VMCore:
ConstantFold.cpp updated: 1.149 -> 1.150
---
Log message:
Add a comment to explain a folding transform.
---
Diffs of the changes: (+1 -0)
ConstantFold.cpp | 1 +
1 files changed, 1 insertion(+)
Index: llvm/lib/VMCore/ConstantFold.cpp
diff -u llvm/lib/VMCore/ConstantFold.cpp:1.149
llvm/lib/VMCore/ConstantFold.cpp:1.150
--- llvm/lib/VMCore/ConstantFold.cpp:1.149 Sun Mar 25 00:47:04 2007
+++ llvm/lib/VMCore/ConstantFold.cpp Mon Mar 26 15:09:02 2007
@@ -554,6 +554,7 @@
if (C2->isNullValue()) return const_cast<Constant*>(C1); // X ^ 0 == X
break;
case Instruction::AShr:
+ // ashr (zext C to Ty), C2 -> lshr (zext C, CSA), C2
if (CE1->getOpcode() == Instruction::ZExt) // Top bits known zero.
return ConstantExpr::getLShr(const_cast<Constant*>(C1),
const_cast<Constant*>(C2));
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