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| author | Owen Anderson <resistor@mac.com> | 2014-01-16 20:36:42 +0000 |
|---|---|---|
| committer | Owen Anderson <resistor@mac.com> | 2014-01-16 20:36:42 +0000 |
| commit | a2a8bbb30f271843dd0678f563a62154919e09b4 (patch) | |
| tree | 8c5978b68565ac64471a374b82da3f20efeb412c /test/Transforms | |
| parent | a560d155d91012e4f3fa9f1742d98ac7562c0bc0 (diff) | |
| download | llvm-a2a8bbb30f271843dd0678f563a62154919e09b4.tar.gz llvm-a2a8bbb30f271843dd0678f563a62154919e09b4.tar.bz2 llvm-a2a8bbb30f271843dd0678f563a62154919e09b4.tar.xz | |
Teach InstCombine that (fmul X, -1.0) can be simplified to (fneg X), which LLVM expresses as (fsub -0.0, X).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199420 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/InstCombine/fmul.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/fmul.ll b/test/Transforms/InstCombine/fmul.ll index 402ee52e62..71b7138b64 100644 --- a/test/Transforms/InstCombine/fmul.ll +++ b/test/Transforms/InstCombine/fmul.ll @@ -93,3 +93,15 @@ for.body: ; preds = %for.cond for.end: ; preds = %for.cond ret void } + +; X * -1.0 => -0.0 - X +define float @test9(float %x) { + %mul = fmul float %x, -1.0 + ret float %mul + +; CHECK-LABEL: @test9( +; CHECK-NOT: fmul +; CHECK: fsub +} + + |