https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78379
--- Comment #11 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> --- One could consider running a reference matrix multiply of size 32 in a loop and do timing tests to determine whether to use -mprefer-avx128. 0n this machine from comment 8 mavx = 1.276 mavx mprefer-avx128 = 3.460 There is some margin there for a fairly good test. Or is there another way to tell?
