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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
2
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"]
...uot;); } + + // If there will ever be e.g. "LangOpts.C", replace "LangOpts.C11 || LangOpts.C99" with "LangOpts.C" on the next line. + if ( (LangOpts.C11 || LangOpts.C99 || LangOpts.CPlusPlus) // ... + /*...*/ && ( CodeGenOptions::FPC_On == Res.getCodeGenOpts().getFPContractMode() ) // ... // just being careful + /*...*/ && (Res.getCodeGenOpts().OptimizationLevel >= 3) ) + LangOpts.DefaultFPContract = 1; + return Success; } diff --git a/clang/test/CodeGen/fp-contract-pragma.cpp b/clang/test/CodeGen/fp-contrac...
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 11
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 Sep 10, 2016, at 3:33 AM, Steve Canon <scanon at apple.com> wrote: >>> >>> Pretty much. In particular, imagine a user trying to debug an unexpected floating point result caused by conversion of a*b + c into fma(a, b, c). >> >> I think that’s unavoidable, because of the way the optimization levels work. Even fma contraction is on by default (something I’d