[Bug tree-optimization/59592] New: Segmentation fault in fold_comparison at -O1

[antoine.balestrat at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59592

            Bug ID: 59592
           Summary: Segmentation fault in fold_comparison at -O1
           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

Hello !

The following testcase makes GCC 4.9.0 as of 20131224 segfault at -O1.

$ cat seg.c
long a, b;

void f(void)
{
    if(0)
    {
        int c, d;
lbl1:
        for(c = 0; c < 1; c++)
            for(b = 0; b < 1;);

        d %= d;
lbl2:
        d ? : 1;
    }

    if(a++)
        goto lbl1;

    int e = 1;

    if((a ^= a ? : 0) < (e && (e %= e)))
        goto lbl2;

    int *p = &e;
}

$ xgcc -O1 seg.c
seg.c: In function ‘f’:
seg.c:26:1: internal compiler error: Segmentation fault
 }
 ^
0x9d80bf crash_signal
    ../../srcdir/gcc/toplev.c:336
0x79a239 fold_comparison
    ../../srcdir/gcc/fold-const.c:9078
0x7a318b fold_binary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
    ../../srcdir/gcc/fold-const.c:12953
0xa0fe01 cleanup_control_expr_graph
    ../../srcdir/gcc/tree-cfgcleanup.c:112
0xa0fe01 cleanup_control_flow_bb
    ../../srcdir/gcc/tree-cfgcleanup.c:187
0xa0fe01 cleanup_tree_cfg_bb
    ../../srcdir/gcc/tree-cfgcleanup.c:605
0xa118a8 cleanup_tree_cfg_1
    ../../srcdir/gcc/tree-cfgcleanup.c:650
0xa118a8 cleanup_tree_cfg_noloop
    ../../srcdir/gcc/tree-cfgcleanup.c:706
0xa118a8 cleanup_tree_cfg()
    ../../srcdir/gcc/tree-cfgcleanup.c:761
0x92e1d4 execute_function_todo
    ../../srcdir/gcc/passes.c:1808
0x92eab3 execute_todo
    ../../srcdir/gcc/passes.c:1884
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.