[Bug tree-optimization/55110] New: Internal compiler error in vectorizable_reduction, at tree-vect-loop.c:4633

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55110

             Bug #: 55110
           Summary: Internal compiler error in vectorizable_reduction, at
                    tree-vect-loop.c:4633
    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


Hello !
The following testcase makes GCC 4.8.0 as of 20121021 crash with -O1
-ftree-vectorize.

$ cat vector.c
int a, b, c;

void f(void)
{
    for(; b; b++)
        for(c = 0; c < 2; c++)
            a /= 5;
}

$ xgcc -O1 -ftree-vectorize -w vector.c
vector.c: In function âfâ:
vector.c:3:6: internal compiler error: in vectorizable_reduction, at
tree-vect-loop.c:4633
 void f(void)
      ^
linux-vdso.so.1: No such file or directory
0xa67b9c vectorizable_reduction(gimple_statement_d*, gimple_stmt_iterator*,
gimple_statement_d**, _slp_tree*)
    ../../srcdir/gcc/tree-vect-loop.c:4633
0xa58fa0 vect_analyze_stmt(gimple_statement_d*, bool*, _slp_tree*)
    ../../srcdir/gcc/tree-vect-stmts.c:5710
0xa58aca vect_analyze_stmt(gimple_statement_d*, bool*, _slp_tree*)
    ../../srcdir/gcc/tree-vect-stmts.c:5632
0xa6356d vect_analyze_loop_operations
    ../../srcdir/gcc/tree-vect-loop.c:1447
0xa6356d vect_analyze_loop_2
    ../../srcdir/gcc/tree-vect-loop.c:1725
0xa6356d vect_analyze_loop(loop*)
    ../../srcdir/gcc/tree-vect-loop.c:1778
0xa75f1c vectorize_loops()
    ../../srcdir/gcc/tree-vectorizer.c:114
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