Fix constant folding of constexprs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5971 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 70fc952..ad4ef42 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -186,12 +186,9 @@
if (BinaryOperator::isNeg(V))
return BinaryOperator::getNegArgument(cast<BinaryOperator>(V));
- // Constants can be considered to be negated values...
- if (Constant *C = dyn_cast<Constant>(V)) {
- Constant *NC = *Constant::getNullValue(V->getType()) - *C;
- assert(NC && "Couldn't constant fold a subtract!");
- return NC;
- }
+ // Constants can be considered to be negated values if they can be folded...
+ if (Constant *C = dyn_cast<Constant>(V))
+ return *Constant::getNullValue(V->getType()) - *C;
return 0;
}