[Bug target/42431] New: wrong code for 200.sixtrack with vectorization and -fdata-sections

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

When compiled with current trunk and options "-m64 -O2 -ftree-vectorize
-maltivec -fdata-sections", CPU2000 test 200.sixtrack gets wrong results and
segfaults before finishing.  I've reproduced the failure on POWER6 and POWER7
hardware.  The source file that is miscompiled is midbloc6.f.  If I add this
line:

  if (icount1.eq.187) write (*,*) ' howdy'

to any two of the DO loops associated with labels 20, 40, 50, 110, 200, 210,
220, 260, and 280 then the test runs to completion and gets the expected
output.

The test passes with these options with GCC 4.4.0.  I don't currently have a
reg
hunt setup on a machine with AltiVec but can do that it if would be useful.


-- 
           Summary: wrong code for 200.sixtrack with vectorization and -
                    fdata-sections
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis at gcc dot gnu dot org
GCC target triplet: powerpc64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42431