On 7 May 2018 at 11:46, Xi Ruoyao wrote: > 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 Or just use -march=broadwell and see if the performance is good enough.
