[Bug tree-optimization/52760] New: Revision 185599 causes miscompare on sphinx3

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52760

             Bug #: 52760
           Summary: Revision 185599 causes miscompare on sphinx3
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: pthaugen@gcc.gnu.org
                CC: bergner@gcc.gnu.org, rguenth@gcc.gnu.org
              Host: powerpc64-linux
            Target: powerpc64-linux
             Build: powerpc64-linux


Created attachment 27025
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27025
testcase

The fix for pr52636 (r185599) introduced a miscompare for cpu2006 benchmark
482.sphinx3 on PowerPC. Attatched testcase can be run and shows incorrect
results.

temp/sphinx3> gcc -m64 -O3 -mcpu=power7 junk.c
temp/sphinx3> a.out
Result = 0101 0303 0505 0707


Output should be:
Result = 0100 0302 0504 0706