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Fix a faulty optimization on FP values

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11801 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-02-24 18:10:14 +00:00
parent 6e4ca61438
commit d38f208cd9
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -441,7 +441,8 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
Value *LHS = I.getOperand(0), *RHS = I.getOperand(1);
// X + 0 --> X
if (RHS == Constant::getNullValue(I.getType()))
if (!I.getType()->isFloatingPoint() && // -0 + +0 = +0, so it's not a noop
RHS == Constant::getNullValue(I.getType()))
return ReplaceInstUsesWith(I, LHS);
// X + X --> X << 1