[Bug tree-optimization/55862] New: ICE in compute_antic, at tree-ssa-pre.c:2495

["antoine.balestrat at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55862

             Bug #: 55862
           Summary: ICE in compute_antic, at tree-ssa-pre.c:2495
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: antoine.balestrat@gmail.com


Hi ! The following testcase makes GCC 4.8.0 as of 20130103 crash at -O2.
It may be related to PR55348 (which was probably a dup anyway).

$ cat antic.c
int g, a, *b;

void f(void)
{
    int *p;

    if(g)
    {
        int **k = &p;

        if(0)
        {
            while(g++)
                for(*b = 0; *b; b++)
label1:
                    ;
        }

        for(; g; p++)
            for(a = 0; a < 1; a++)
            {
                int *c = p;
label2:
                if(a < 1)
                    *c = 0;
            }

        goto label1;
    }

    goto label2;
}

$ xgcc -O2 -w antic.c
antic.c: In function ‘f’:
antic.c:3:6: internal compiler error: in compute_antic, at tree-ssa-pre.c:2495
 void f(void)
      ^
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