https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78379
--- Comment #15 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- OMG, the world of processors is more complicated than I thought. So, these rather modern AMD chips support AVX, but suck at it. Two questions: - Can you check if -mfma3 and/or -mfma4 make any difference? - If you start any program compiled with -g under the debugger, break anywhere (for example at the beginning of the main program) and do a "p __cpu_model", what do you get? I am halfway tempted to restrict the AVX* stuff to Intel processors only. At least, this way we will not make things worse for AMD processors.
