[PATCH] Another fix to the misaligned store vectorizer patch

[Revital1 Eres <ERES at il dot ibm dot com>]

Hello,

I mistakenly allowed peeling for alignment to be considered for loads
(instead of only stores as the original behavior).  This can effect
targets which does not support misalign stores but support misalign
loads -- for these targets we have more chances to vectorize a loop
if we peel for stores as the loads are already supported (i.e., satisfy
vect_supportable_dr_alignment).
This patch fixes it.

Bootstrapped with vectorization enabled on powerpc64 and regtested
on x86_64 and ppc.

OK for mainline?

Thanks,
Revital

ChangeLog:

testsuite/
        * gcc.target/powerpc/vsx-vectorize-3.c: Adjust tetcase following
        change in decision of peeling for alignment.
        * gcc.target/powerpc/vsx-vectorize-5.c: Likewise.
        * gcc.dg/vect/vect-50.c: Likewise.
        * gcc.dg/vect/vect-42.c: Likewise.
        * gcc.dg/vect/costmodel/i386/costmodel-fast-math-vect-pr29925.c:
        Likewise.
        * gcc.dg/vect/costmodel/x86_64/costmodel-fast-math-vect-pr29925.c:
        Likewise.
        * gcc.dg/vect/vect-multitypes-6.c: Likewise.
        * gcc.dg/vect/vect-60.c: Likewise.
        * gcc.dg/vect/vect-52.c: Likewise.
        * gcc.dg/vect/vect-44.c: Likewise.
        * gcc.dg/vect/vect-27.c: Likewise.
        * gcc.dg/vect/vect-29.c: Likewise.
        * gcc.dg/vect/vect-72.c: Likewise.
        * gcc.dg/vect/vect-56.c: Likewise.
        * gcc.dg/vect/vect-48.c: Likewise.
        * gcc.dg/vect/vect-multitypes-3.c: Likewise.
        * gfortran.dg/vect/vect-2.f90: Likewise.
        * gfortran.dg/vect/vect-5.f90: Likewise.

gcc/
        * tree-vect-data-refs.c: Consider peeling for alignment only
        for stores and remove redundant assignment.

(See attached file: patch_misalign_4_11.txt)

Attachment: patch_misalign_4_11.txt
Description: Text document