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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"]
....DefaultFPContract = 1; + return Success; } diff --git a/clang/test/CodeGen/fp-contract-pragma.cpp b/clang/test/CodeGen/fp-contract-pragma.cpp index 1c5921a..0949272 100644 --- a/clang/test/CodeGen/fp-contract-pragma.cpp +++ b/clang/test/CodeGen/fp-contract-pragma.cpp @@ -13,6 +13,7 @@ float fp_contract_2(float a, float b, float c) { // CHECK: _Z13fp_contract_2fff // CHECK: %[[M:.+]] = fmul float %a, %b // CHECK-NEXT: fadd float %[[M]], %c + #pragma STDC FP_CONTRACT OFF { #pragma STDC FP_CONTRACT ON } Please give me any and all feedback you may have on this suggested change...
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