[patch, libfortran] Add AVX-specific matmul

[Jakub Jelinek]

On Wed, Nov 16, 2016 at 10:30:03PM +0100, Thomas Koenig wrote:
> the attached patch adds an AVX-specific version of the matmul
> intrinsic to the Fortran library.  This works by using the target_clones
> attribute.

Don't you need to test in configure if the assembler supports AVX?
Otherwise if somebody is bootstrapping gcc with older assembler, it will
just fail to bootstrap.
For matmul_i*, wouldn't it make more sense to use avx2 instead of avx,
or both avx and avx2 and maybe avx512f?

> 2016-11-16  Thomas Koenig  <tkoenig@gcc.gnu.org>
> 
>         PR fortran/78379
>         * m4/matmul.m4:  For x86_64, make the work function for matmul

Why the extra space before For?

>         static with target_clones for AVX and default, and create
>         a wrapper function to call it.
>         * generated/matmul_c10.c

Missing : Regenerated.

	Jakub