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| author | Mon P Wang <wangmp@apple.com> | 2009-01-31 06:07:45 +0000 |
|---|---|---|
| committer | Mon P Wang <wangmp@apple.com> | 2009-01-31 06:07:45 +0000 |
| commit | a7b6cff99f5015120f828c316823cb32eed93901 (patch) | |
| tree | a046b83051e726f491d34728317c9eb396f50f58 /test/CodeGen/X86/neg_fp.ll | |
| parent | 9729c5ad3413d3b69d4bc41aa918a7a8dd6bf9f0 (diff) | |
| download | llvm-a7b6cff99f5015120f828c316823cb32eed93901.tar.gz llvm-a7b6cff99f5015120f828c316823cb32eed93901.tar.bz2 llvm-a7b6cff99f5015120f828c316823cb32eed93901.tar.xz | |
If unsafe FP optimization is not set, don't allow -(A-B) => B-A because
when A==B, -0.0 != +0.0.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63474 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/neg_fp.ll')
| -rw-r--r-- | test/CodeGen/X86/neg_fp.ll | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/test/CodeGen/X86/neg_fp.ll b/test/CodeGen/X86/neg_fp.ll new file mode 100644 index 0000000000..55c76549ff --- /dev/null +++ b/test/CodeGen/X86/neg_fp.ll @@ -0,0 +1,12 @@ +; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse41 -o %t -f +; RUN: grep xorps %t | count 1 + +; Test that when we don't -enable-unsafe-fp-math, we don't do the optimization +; -0 - (A - B) to (B - A) because A==B, -0 != 0 + +define float @negfp(float %a, float %b) { +entry: + %sub = sub float %a, %b ; <float> [#uses=1] + %neg = sub float -0.000000e+00, %sub ; <float> [#uses=1] + ret float %neg +}
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