On Wed, Jun 19, 2013 at 11:01:59AM +0400, Igor Zamyatin wrote:
> The change also affects vectorizer in avx case which could be seen for
> gcc.dg/tree-ssa/loop-19.c test.
>
> After the change report says
>
> loop-19_bad.c:16: note: === vect_analyze_data_refs_alignment ===
> loop-19_bad.c:16: note: vect_compute_data_ref_alignment:
> loop-19_bad.c:16: note: can't force alignment of ref: a[j_9]
> loop-19_bad.c:16: note: vect_compute_data_ref_alignment:
> loop-19_bad.c:16: note: can't force alignment of ref: c[j_9]
>
> AFAICS first condition in ix86_data_alignment was true before the
> change so 256 was a return value.
>
> Do we need to tweak this test also?
I'd add -fno-common to the test.
Jakub
