Consider expression "0.0 - X" as the negation of X if
- this expression is explicitly marked no-signed-zero, or
- no-signed-zero of this expression can be derived from some context.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171922 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/InstCombine/InstructionCombining.cpp b/lib/Transforms/InstCombine/InstructionCombining.cpp
index 6f24cdd..dc7fe5c 100644
--- a/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -516,8 +516,8 @@
// instruction if the LHS is a constant negative zero (which is the 'negate'
// form).
//
-Value *InstCombiner::dyn_castFNegVal(Value *V) const {
- if (BinaryOperator::isFNeg(V))
+Value *InstCombiner::dyn_castFNegVal(Value *V, bool IgnoreZeroSign) const {
+ if (BinaryOperator::isFNeg(V, IgnoreZeroSign))
return BinaryOperator::getFNegArgument(V);
// Constants can be considered to be negated values if they can be folded.