-fno-trapping-math(假设浮点运算无法生成用户可见的陷阱来编译代码。这些陷阱包括被零除、溢出、下溢、不精确结果和无效操作) -fassociative-math(允许在一系列浮点运算中重新关联操作数)和-freciprocal-math(如果可以进行优化,则允许使用值的倒数而不是除以该值) -ffinite-math-only:允许对假设参数和结果不是 NaN ...
gcc:使用选项 -ffast-math -O2 -m32 clang:使用选项 -ffast-math -O2 -m32 数组长度为 28884 = 7221 * 4; cpu 是 core i5,3.5Ghz 测试结果: win10:平台,vc120 (0.06x ms),gcc10 (0.06x ms),clang11 (0.09x ms) centos8:平台,gcc8 (0.06x ms),gcc10 (0.06x ms),clang11 (0.09x ms) ...
gcc, simd intrinsics and fast-math conceptshttps://stackoverflow.com/questions/4966489/gcc-simd-intrinsics-and-fast-math-concepts What does gcc's ffast-math actually do?https://stackoverflow.com/questions/7420665/what-does-gccs-ffast-math-actually-do?noredirect=1&lq=1 Why doesn't GCC optimi...
We see from the graph below that AVX code performs better than the -ffast-math code and is also safer.This is definitely a case in which the effort of writing SIMD intrinsics is worth it.4. gcc 编译优化选项关系 -Ofast = -O3 + -ffast-math + -fallow-store-data-races -ffast-math S...
分别使用marvell(gcc4.1.1) 以及 maemo 编译器(codesourcery 2005q3-2,gcc3.4.4)并使用不同的编译选项进行测试对比。 程序运行在 PXA310 624M CPU 下。 marvell 编译器 + -ffast-math arm-iwmmxt-Linux-gnueabi-gcc float.c -o float1 ...
Use this library of math routines for compute-intensive tasks: linear algebra, FFT, RNG. Optimized for high-performance computing and data science.
and I found it odd that the compiler would choose to optimize something in a way that objectively changes its behavior. As it turns out, GCC has-ffp-contract=fastby default,even with-fno-fast-math.Apparently these behavior differences are so incredibly minor that GCC decided to have the fast...
See for example the -ffast-math flag in the gcc documentation and the gcc wiki page FloatingPointMath. GHC, however, has no built in flags for these optimizations. But that's okay. GHC's RULES pragmas are sufficiently powerful to achieve most of the performance benefits of -ffast-math....
分别使用marvell(gcc4.1.1) 以及 maemo 编译器(codesourcery 2005q3-2,gcc3.4.4)并使用不同的编译选项进行测试对比。 程序运行在 PXA310 624M CPU 下。 marvell 编译器 + -ffast-math arm-iwmmxt-Linux-gnueabi-gcc float.c -o float1 arm-iwmmxt-linux-gnueabi-strip float1 ...
Use this library of math routines for compute-intensive tasks: linear algebra, FFT, RNG. Optimized for high-performance computing and data science.