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  • What does gccs ffast-math actually do? - Stack Overflow
    With -fast_math, the order of evaluation can be changed, violating nothing in IEEE standards, but violating C++ rules, and wreaking havoc with reproducibility But I'm wondering whether some of these -fast_math hacks really do produce faster computations in typical deployments
  • Optimize Options (Using the GNU Compiler Collection (GCC))
    This option is enabled by default for C or C++ if a strict conformance option such as -std=c99 or -std=c++17 is used -ffast-math enables -fexcess-precision=fast by default regardless of whether a strict conformance option is used
  • Beware of fast-math - GitHub Pages
    This is perhaps the single most frequent cause of fast-math-related StackOverflow questions and GitHub bug reports, and so if your fast-math-compiled code is giving wrong results, the very first thing you should do is disable this option (-fno-finite-math-only)
  • C++优化笔记: -O2 -O3 -ffast-math SIMD - 流了个火 - 博客园
    -ffast-math essentially turns on unsafe math optimizations and the changes due to this compiler option can propagate to the code that may link against your code in future (see Note of -ffast-math in References)
  • Optimizations enabled by -ffast-math – Krister Walfridssons blog . . .
    This blog post describes the optimizations enabled by -ffast-math when compiling C or C++ code with GCC 11 for x86_64 Linux (other languages operating systems CPU architectures may enable slightly different optimizations)
  • -Ofast and -ffast-math non-local effects - GitHub Pages
    The default is -fno-unsafe-math-optimizations This option changes global setting of an FP unit at program start This change affects not only the code explicitly compiled with -ffast-math but also affects everything else that resides in the same address space
  • 1. 3. 7. Optimization Options — TI Arm Clang Compiler Tools Users Guide
    -ffast-math,-fno-fast-math ¶ Enable or disable ‘fast-math’ mode during compilation By default, the ‘fast-math’ mode is disabled Enabling ‘fast-math’ mode allows the compiler to perform agressive, not necessarily value-safe, assumptions about floating-point math, such as:
  • What exactly -ffast-math option does while compiling with gcc
    Sets -fno-math-errno, -funsafe-math-optimizations, -ffinite-math-only, -fno-rounding-math, -fno-signaling-nans and -fcx-limited-range So it doesn't do anything interesting by itself, but is just a shorthand to several more interesting compiler options


















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