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relax this a bit, as we only support the default rounding mode

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23771 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-10-17 17:49:32 +00:00
parent a1ff93159a
commit 560a17d3bc
1 changed files with 4 additions and 2 deletions
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6
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -694,8 +694,10 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) {
return ReplaceInstUsesWith(I, RHS);
// X + 0 --> X
if (!I.getType()->isFloatingPoint() && // -0 + +0 = +0, so it's not a noop
RHSC->isNullValue())
// NOTE: -0 + +0 = +0 in non-default rounding modes. When we support them
// we must disable this. Note that 0.0-0.0 = -0.0, so this doesn't hold
// for SUB.
if (RHSC->isNullValue())
return ReplaceInstUsesWith(I, LHS);
// X + (signbit) --> X ^ signbit