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Consider expression "0.0 - X" as the negation of X if

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- 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
This commit is contained in:
Shuxin Yang
2013-01-09 00:13:41 +00:00
parent b6714227ed
commit 935e35d2b9
7 changed files with 35 additions and 9 deletions
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4
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -516,8 +516,8 @@ Value *InstCombiner::dyn_castNegVal(Value *V) const {
// 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.