[Bug testsuite/51693] New: New XPASSes in vectorizer testsuite on powerpc64-suse-linux

["irar at il dot ibm.com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51693

             Bug #: 51693
           Summary: New XPASSes in vectorizer testsuite on
                    powerpc64-suse-linux
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: irar@il.ibm.com
                CC: michael.v.zolotukhin@gmail.com
              Host: powerpc64-suse-linux
            Target: powerpc64-suse-linux
             Build: powerpc64-suse-linux


Revision 182583 http://gcc.gnu.org/viewcvs?view=revision&revision=182583 caused
several XPASSes on powerpc64-suse-linux:

XPASS: gcc.dg/vect/vect-multitypes-1.c scan-tree-dump-times vect "Alignment of
access forced using peeling" 2
XPASS: gcc.dg/vect/vect-multitypes-1.c scan-tree-dump-times vect "Vectorizing
an unaligned access" 4
XPASS: gcc.dg/vect/vect-peel-3.c scan-tree-dump-times vect "Vectorizing an
unaligned access" 1
XPASS: gcc.dg/vect/vect-peel-3.c scan-tree-dump-times vect "Alignment of access
forced using peeling" 1
XPASS: gcc.dg/vect/vect-multitypes-1.c -flto scan-tree-dump-times vect
"Alignment of access forced using peeling" 2
XPASS: gcc.dg/vect/vect-multitypes-1.c -flto scan-tree-dump-times vect
"Vectorizing an unaligned access" 4
XPASS: gcc.dg/vect/vect-peel-3.c -flto scan-tree-dump-times vect "Vectorizing
an unaligned access" 1
XPASS: gcc.dg/vect/vect-peel-3.c -flto scan-tree-dump-times vect "Alignment of
access forced using peeling" 1
XPASS: gcc.dg/vect/no-section-anchors-vect-69.c scan-tree-dump-times vect
"Alignment of access forced using peeling" 2

The reason is that {!vect_aligned_arrays} was added to xfail of the above
checks, while vect_aligned_arrays is false for power.

Changing that, i.e.:
Index: ../../lib/target-supports.exp
===================================================================
--- ../../lib/target-supports.exp       (revision 182703)
+++ ../../lib/target-supports.exp       (working copy)
@@ -3222,7 +3222,8 @@ proc check_effective_target_vect_aligned_arrays {
                 set et_vect_aligned_arrays_saved 1
            }
        }
-        if [istarget spu-*-*] {
+        if {[istarget spu-*-*]
+           || [istarget powerpc*-*-*] } {
            set et_vect_aligned_arrays_saved 1
        }
     }

fixes the XPASSes and doesn't cause any problems (on powerpc64-suse-linux), but
AFAIU arrays are not always vector aligned on power, so this is not a good
idea, unless we change the definition of
check_effective_target_vect_aligned_arrays.

What was the purpose of adding {!vect_aligned_arrays} to these tests? If
peeling is impossible on AVX because arrays are never vector aligned, maybe we
need a new target check instead of vect_aligned_arrays?