[Bug tree-optimization/66799] New: [6 regression] gcc.dg/vect/pr20122.c FAILs

["ro at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66799

            Bug ID: 66799
           Summary: [6 regression] gcc.dg/vect/pr20122.c FAILs
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ro at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---
            Target: sparc*-*-solaris2.*

Between r225008 and r225374, gcc.dg/vect/pr20122.c began to FAIL on
Solaris/SPARC,
both 32 and 64-bit:

FAIL: gcc.dg/vect/pr20122.c -flto -ffat-lto-objects  scan-tree-dump-times vect
"Alignment of access forced using versioning" 2
FAIL: gcc.dg/vect/pr20122.c scan-tree-dump-times vect "Alignment of access
forced using versioning" 2

A reghunt revealed that this was caused by

2015-07-02  Richard Biener  <rguenther@suse.de>

        * builtins.c (get_pointer_alignment_1): Handle POINTER_PLUS_EXPR.
        * fold-const.c (get_pointer_modulus_and_residue): Remove.
        (fold_binary_loc): Implement (T)ptr & CST in terms of
        get_pointer_alignment_1.
        * tree-vect-loop-manip.c (vect_gen_niters_for_prolog_loop):
        Make sure to build the alignment test on a SSA name without
        final alignment info valid only after the prologue.

  Rainer