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defaults for FP contraction [e.g. fused multiply-add]: suggestion and patch to be slightly more aggressive and to make Clang`s optimization settings closer to having the same meaning as when they are given to GCC [at least for "-O3"]
2016 Sep 09
3
defaults for FP contraction [e.g. fused multiply-add]: suggestion and patch to be slightly more aggressive and to make Clang`s optimization settings closer to having the same meaning as when they are given to GCC [at least for "-O3"]
On 09/09/2016 04:31 PM, Stephen Canon wrote: > Gating this on -Owhatever is dangerous, . We should simply default to the pragma “on” state universally. Why so? [honestly asking, not arguing] My guess: b/c we don`t want programs to give different results when compiled at different "-O<...>" settings with the exception of "-Ofast". At any rate, the above change is