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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
Low Level Virtual Machine (LLVM) ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.