[Bug testsuite/50435] New: FAIL: gcc.dg/vect/bb-slp-25.c (-flto)? scan-tree-dump-times slp "basic block vectorized using SLP" 1

["dominiq at lps dot ens.fr" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50435

             Bug #: 50435
           Summary: FAIL: gcc.dg/vect/bb-slp-25.c (-flto)?
                    scan-tree-dump-times slp "basic block vectorized using
                    SLP" 1
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: testsuite
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dominiq@lps.ens.fr
                CC: irar@gcc.gnu.org
              Host: x86_64-apple-darwin10
            Target: x86_64-apple-darwin10
             Build: x86_64-apple-darwin10


On x86_64-apple-darwin10 the test gcc.dg/vect/bb-slp-25.c fails (see
http://gcc.gnu.org/ml/gcc-testresults/2011-09/msg01560.html ). Looking for SLP
in bb-slp-25.c.115t.slp I get

189: Failed to SLP the basic block.
189: not vectorized: failed to find SLP opportunities in basic block.
18: Failed to SLP the basic block.
18: not vectorized: failed to find SLP opportunities in basic block.
41: Failed to SLP the basic block.
41: not vectorized: failed to find SLP opportunities in basic block.
48: Failed to SLP the basic block.
48: not vectorized: failed to find SLP opportunities in basic block.

indeed no "basic block vectorized using SLP". However compiling the test with
-ftree-vectorizer-verbose=2 returns

...
Vectorizing loop at /opt/gcc/work/gcc/testsuite/gcc.dg/vect/bb-slp-25.c:16

16: created 2 versioning for alias checks.

16: vectorizing stmts using SLP.
16: LOOP VECTORIZED.
...

I have applied r178880 on top of r178869 on powerpc-apple-darwin9 and the tests
pass while I get the above results when I run them manually.