[Bug target/57927] -march=core-avx2 different than -march=native on INTEL Haswell (i7-4700K)

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57927

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Christian Widmer from comment #4)

> Here is a short patch adding Ivy Bridge and Haswell detection. Because Ivy
> Bridge does not support AVX2 it differs a bit from the suggestion above.

Please post patches to gcc-patches@ mailing list, following the procedure
outlined in [1].

[1] http://gcc.gnu.org/contribute.html