https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69891
--- Comment #12 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Uroš Bizjak from comment #11)
> (In reply to Jakub Jelinek from comment #9)
> > Created attachment 37801 [details]
> > gcc6-pr69891.patch
> >
> > Full patch I'm going to bootstrap/regtest.
>
> +/* PR rtl-optimization/69891 */
> +/* { dg-do run } */
> +/* { dg-options "-O -fno-tree-fre -mstringop-strategy=libcall -Wno-psabi" }
> */
> +/* { dg-additional-options "-mno-sse" { target ia32 } } */
>
> -mstringop-strategy is x86 specific option.
Oh ... the testcase *is* in gcc.target/i386/... directory
