[Bug tree-optimization/57322] New: Segfault at -O1 in build_and_add_sum

[antoine.balestrat at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57322

            Bug ID: 57322
           Summary: Segfault at -O1 in build_and_add_sum
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: antoine.balestrat at gmail dot com

Using GCC 4.9.0 as of 20130518 :

$ cat seg.c
int a;

void f(void)
{
    char b;
    for (;; a++)
    {
        char *p = &b, *q;
        *q = b < 0 & !!*p;
    }
}

$ xgcc -w -O1 seg.c
seg.c: In function ‘f’:
seg.c:3:6: internal compiler error: Segmentation fault
 void f(void)
      ^
0x91001f crash_signal
    ../../srcdir/gcc/toplev.c:333
0xa4816c build_and_add_sum
    ../../srcdir/gcc/tree-ssa-reassoc.c:4440
0xa4ee6e eliminate_redundant_comparison
    ../../srcdir/gcc/tree-ssa-reassoc.c:1605
0xa4ee6e optimize_ops_list
    ../../srcdir/gcc/tree-ssa-reassoc.c:1675
0xa4ffbe reassociate_bb
    ../../srcdir/gcc/tree-ssa-reassoc.c:4210
0xa4fd87 reassociate_bb
    ../../srcdir/gcc/tree-ssa-reassoc.c:4291
0xa4fd87 reassociate_bb
    ../../srcdir/gcc/tree-ssa-reassoc.c:4291
0xa519a0 do_reassoc
    ../../srcdir/gcc/tree-ssa-reassoc.c:4325
0xa519a0 execute_reassoc
    ../../srcdir/gcc/tree-ssa-reassoc.c:4407
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.