Changes in directory llvm/lib/Transforms/Scalar:
InstructionCombining.cpp updated: 1.454 -> 1.455
---
Log message:
extractelement(undef,x) -> undef
---
Diffs of the changes: (+8 -6)
InstructionCombining.cpp | 14 ++++++++------
1 files changed, 8 insertions(+), 6 deletions(-)
Index: llvm/lib/Transforms/Scalar/InstructionCombining.cpp
diff -u llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.454
llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.455
--- llvm/lib/Transforms/Scalar/InstructionCombining.cpp:1.454 Thu Mar 30
16:02:40 2006
+++ llvm/lib/Transforms/Scalar/InstructionCombining.cpp Fri Mar 31 12:25:14 2006
@@ -6655,12 +6655,14 @@
}
Instruction *InstCombiner::visitExtractElementInst(ExtractElementInst &EI) {
- if (ConstantAggregateZero *C =
- dyn_cast<ConstantAggregateZero>(EI.getOperand(0))) {
- // If packed val is constant 0, replace extract with scalar 0
- const Type *Ty = cast<PackedType>(C->getType())->getElementType();
- return ReplaceInstUsesWith(EI, Constant::getNullValue(Ty));
- }
+ // If packed val is undef, replace extract with scalar undef.
+ if (isa<UndefValue>(EI.getOperand(0)))
+ return ReplaceInstUsesWith(EI, UndefValue::get(EI.getType()));
+
+ // If packed val is constant 0, replace extract with scalar 0.
+ if (isa<ConstantAggregateZero>(EI.getOperand(0)))
+ return ReplaceInstUsesWith(EI, Constant::getNullValue(EI.getType()));
+
if (ConstantPacked *C = dyn_cast<ConstantPacked>(EI.getOperand(0))) {
// If packed val is constant with uniform operands, replace EI
// with that operand
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
