[Bug tree-optimization/65930] Reduction with sign-change not handled

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65930

--- Comment #19 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Oct 23 12:41:49 2019
New Revision: 277322

URL: https://gcc.gnu.org/viewcvs?rev=277322&root=gcc&view=rev
Log:
2019-10-23  Richard Biener  <rguent...@suse.de>

        PR tree-optimization/65930
        * tree-vect-loop.c (check_reduction_path): Allow conversions
        that only change the sign.
        (vectorizable_reduction): Relax latch def stmts we handle further.

        * gcc.dg/vect/vect-reduc-2char-big-array.c: Adjust.
        * gcc.dg/vect/vect-reduc-2char.c: Likewise.
        * gcc.dg/vect/vect-reduc-2short.c: Likewise.
        * gcc.dg/vect/vect-reduc-dot-s8b.c: Likewise.
        * gcc.dg/vect/vect-reduc-pattern-2c.c: Likewise.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.dg/vect/vect-reduc-2char-big-array.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-reduc-2char.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-reduc-2short.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s8b.c
    trunk/gcc/testsuite/gcc.dg/vect/vect-reduc-pattern-2c.c
    trunk/gcc/tree-vect-loop.c