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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"]
...ion-related flags. Patch relative to upstream code with Git ID b0768e805d1d33d730e5bd44ba578df043dfbc66 ------------------------------------------------------------------------------------ diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp index 619ea9c..d02d873 100644 --- a/clang/lib/Frontend/CompilerInvocation.cpp +++ b/clang/lib/Frontend/CompilerInvocation.cpp @@ -2437,6 +2437,13 @@ bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res, if (Arch == llvm::Triple::spir || Arch == llvm::Triple::spir64) { Res.getDiagnosticOp...
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