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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"]
...compile the same non-toolchain program while using the "same"* compiler flags, I have found something that may be worth changing in Clang, developed a patch, and confirmed that the patch has its intended effect. *: "same" in quotes b/c the essence of the problem is that the _meaning_ of "-O3" on Clang differs from that of "-O3" on GCC in at least one way. The specific problem here relates to the default settings for FP contraction, e.g. fused multiply-add. At -O2 and higher, GCC defaults FP contraction to "fast", i.e. always on. I`m not sugge...