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| author | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-02-12 06:15:29 +0000 |
|---|---|---|
| committer | Ahmed Bougacha <ahmed.bougacha@gmail.com> | 2015-02-12 06:15:29 +0000 |
| commit | 24433a7005835a551f3d71f61aa632db36f639b0 (patch) | |
| tree | 6717b6486377a5a3c9407365a647edadf9cc6a85 /clang/lib/Frontend/InitPreprocessor.cpp | |
| parent | 92ee75c0b2352b4394832cbc71d059321e8854c3 (diff) | |
| download | llvm-24433a7005835a551f3d71f61aa632db36f639b0.zip llvm-24433a7005835a551f3d71f61aa632db36f639b0.tar.gz llvm-24433a7005835a551f3d71f61aa632db36f639b0.tar.bz2 | |
[CodeGen] Don't blindly combine (fp_round (fp_round x)) to (fp_round x).
We used to do this DAG combine, but it's not always correct:
If the first fp_round isn't a value preserving truncation, it might
introduce a tie in the second fp_round, that wouldn't occur in the
single-step fp_round we want to fold to.
In other words, double rounding isn't the same as rounding.
Differential Revision: http://reviews.llvm.org/D7571
llvm-svn: 228911
Diffstat (limited to 'clang/lib/Frontend/InitPreprocessor.cpp')
0 files changed, 0 insertions, 0 deletions