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| author | Chris Lattner <sabre@nondot.org> | 2005-10-17 17:56:38 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2005-10-17 17:56:38 +0000 |
| commit | 5e678e03b72487d53117b05d23fd23f29bd8c344 (patch) | |
| tree | 8f9fd68156dcb9dcc532d5626628c5afea5dceae /lib/Transforms | |
| parent | 560a17d3bc8d3a3f6be179d428d31abd64498283 (diff) | |
| download | external_llvm-5e678e03b72487d53117b05d23fd23f29bd8c344.zip external_llvm-5e678e03b72487d53117b05d23fd23f29bd8c344.tar.gz external_llvm-5e678e03b72487d53117b05d23fd23f29bd8c344.tar.bz2 | |
Oops, X+0.0 isn't foldable, but X+-0.0 is.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23772 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms')
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 67a5401..d92e126 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -694,11 +694,12 @@ Instruction *InstCombiner::visitAdd(BinaryOperator &I) { return ReplaceInstUsesWith(I, RHS); // X + 0 --> X - // 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()) + if (!I.getType()->isFloatingPoint()) { // NOTE: -0 + +0 = +0. + if (RHSC->isNullValue()) + return ReplaceInstUsesWith(I, LHS); + } else if (cast<ConstantFP>(RHSC)->isExactlyValue(-0.0)) { return ReplaceInstUsesWith(I, LHS); + } // X + (signbit) --> X ^ signbit if (ConstantInt *CI = dyn_cast<ConstantInt>(RHSC)) { |