[Bug target/64844] [5 Regression] Vectorization inhibited in gcc5 when loop starts with elem[1], aarch64 perf regression from 4.9.1

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64844

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Jan 29 12:53:39 2015
New Revision: 220244

URL: https://gcc.gnu.org/viewcvs?rev=220244&root=gcc&view=rev
Log:
2015-01-29  Richard Biener  <rguent...@suse.de>

    PR tree-optimization/64844
    * tree-vect-loop.c (vect_estimate_min_profitable_iters): Always
    dump cost model analysis.
    * tree-vect-data-refs.c (vect_enhance_data_refs_alignment):
    Do not register adjusted load/store costs here.

    * gcc.dg/vect/pr64844.c: New testcase.

Added:
    trunk/gcc/testsuite/gcc.dg/vect/pr64844.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-vect-data-refs.c
    trunk/gcc/tree-vect-loop.c