[Bug tree-optimization/56426] New: Segmentation fault in find_var_scev_info, at tree-scalar-evolution.c:358

[antoine.balestrat at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56426

             Bug #: 56426
           Summary: Segmentation fault in find_var_scev_info, at
                    tree-scalar-evolution.c:358
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: antoine.balest...@gmail.com


Using GCC 4.8.0 as of 20130222 :

$ cat scev.c
int a, *c;

void f(void)
{
    int b = 0;

    for(a = 0;; a++)
        if(--b)
        {
            if(a)
lbl:
                a++;

            c = &b;
            goto lbl;
        }
}

$ xgcc -w -O2 scev.c
scev.c: In function ‘f’:
scev.c:3:6: internal compiler error: Segmentation fault
 void f(void)
      ^
0x8f89ef crash_signal
    ../../srcdir/gcc/toplev.c:332
0xe1228f htab_find_slot
    ../../srcdir/libiberty/hashtab.c:712
0x98caf5 find_var_scev_info
    ../../srcdir/gcc/tree-scalar-evolution.c:358
0x98f999 get_scalar_evolution
    ../../srcdir/gcc/tree-scalar-evolution.c:559
0x98f999 analyze_scalar_evolution(loop*, tree_node*)
    ../../srcdir/gcc/tree-scalar-evolution.c:1963
0xa00287 infer_loop_bounds_from_signedness
    ../../srcdir/gcc/tree-ssa-loop-niter.c:2887
0xa00287 infer_loop_bounds_from_undefined
    ../../srcdir/gcc/tree-ssa-loop-niter.c:2944
0xa00287 estimate_numbers_of_iterations_loop
    ../../srcdir/gcc/tree-ssa-loop-niter.c:3340
0xa00287 estimate_numbers_of_iterations_loop(loop*)
    ../../srcdir/gcc/tree-ssa-loop-niter.c:3302
0xa015e4 estimate_numbers_of_iterations()
    ../../srcdir/gcc/tree-ssa-loop-niter.c:3534
0xa01aa7 tree_ssa_loop_bounds
    ../../srcdir/gcc/tree-ssa-loop.c:432
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