[Bug middle-end/24095] New: use of garbage-collected memory with -ftree-vectorize

[Bug middle-end/24095] New: use of garbage-collected memory with -ftree-vectorize

[janis187 at us dot ibm dot com]

GCC mainline for powerpc-linux segfaults when compiling several of the
SPEC CPU2000 tests with "-ftree-vectorize -maltivec -mabi=altivec".
For most of them this happens with both -m32 and -m64.

The minimized test case (to be attached) causes the failure when
compiled with "-O2 -ftree-vectorize -maltivec --param ggc-min-expand=0
--param ggc-min-heapsize=0".  The segfault is in fold_convert with
orig having the value 0xa5a5a5a5.

A reghunt identified the following patch from rth@gcc.gnu.org:

  http://gcc.gnu.org/ml/gcc-cvs/2005-09/msg00635.html

This could be a latent bug, since on one of the systems I use regularly
I was not able to reproduce the failure.

-- 
           Summary: use of garbage-collected memory with -ftree-vectorize
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis187 at us dot ibm dot com
                CC: gcc-bugs at gcc dot gnu dot org,rth at gcc dot gnu dot
                    org
GCC target triplet: powerpc-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24095

[Bug middle-end/24095] use of garbage-collected memory with -ftree-vectorize

[janis187 at us dot ibm dot com]

------- Additional Comments From janis187 at us dot ibm dot com  2005-09-27 22:52 -------
Created an attachment (id=9824)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9824&action=view)
minimized test case

Test case mentioned in the submittal message.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24095

[Bug middle-end/24095] use of garbage-collected memory with -ftree-vectorize

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-27 23:29 -------
There is an even shorter testcase in PR 24049, there was another bug about this somewhere too which 
was fixed and a bug which was opened for being able to call ggc_collect in the loop optimizers but I 
cannot find either of them right now.

*** This bug has been marked as a duplicate of 24049 ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24095