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0f019d6283
This one is enabled only under -ffast-math. There are cases where the difference between the value computed and the correct value is huge even for ffast-math, e.g. as Steven pointed out: x = -1, y = -4 log(pow(-1), 4) = 0 4*log(-1) = NaN I checked what GCC does and apparently they do the same optimization (which result in the dramatic difference). Future work might try to make this (slightly) less worse. Differential Revision: http://reviews.llvm.org/D14400 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254263 91177308-0d34-0410-b5e6-96231b3b80d8