On 2018-05-07 18:30 +0800, Feng Longda wrote: > If we set -march/tune to define processor, we can obtain some extra > performance improvement. > > I want to run my application on different intel processor family, for > example: broadwell, skylake, haswell, skylake-avx512. > > What should I set? Does It like the following ? > > -march=broadwell -mtune=intel -mmmx -msse -msse -msse2 -msse3 -mavx > -mavx2 -mavx=512f -mavx512pf ... No. Then GCC would use AVX-512, and the program can't run on processors without AVX-512. (You'll see "Illegal Instruction - Core Dumped"). You should use target_clone attribute. c.f. https://gcc.gnu.org/onlinedocs/gcc-8.1.0/gcc/Common-Function-Attributes.html -- Xi Ruoyao <ryxi@xxxxxxxxxxxxxxxxx> School of Aerospace Science and Technology, Xidian University
