[Bug tree-optimization/56350] New: ICE in vectorizable_reduction, at tree-vect-loop.c:4731

[antoine.balestrat at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56350

             Bug #: 56350
           Summary: ICE in vectorizable_reduction, at
                    tree-vect-loop.c:4731
    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 20130215 :

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

void f(void)
{
    for(; c; c++)
        for(b = 0; b < 2; b++)
            a /= 8;
}

$ xgcc -O1 -ftree-vectorize -w vect.c
vect.c: In function ‘f’:
vect.c:3:6: internal compiler error: in vectorizable_reduction, at
tree-vect-loop.c:4731
 void f(void)
      ^
0xa8e953 vectorizable_reduction(gimple_statement_d*, gimple_stmt_iterator*,
gimple_statement_d**, _slp_tree*)
    ../../srcdir/gcc/tree-vect-loop.c:4727
0xa81ff0 vect_analyze_stmt(gimple_statement_d*, bool*, _slp_tree*)
    ../../srcdir/gcc/tree-vect-stmts.c:5691
0xa80f75 vect_analyze_stmt(gimple_statement_d*, bool*, _slp_tree*)
    ../../srcdir/gcc/tree-vect-stmts.c:5613
0x4cffb9 vect_analyze_loop_operations
    ../../srcdir/gcc/tree-vect-loop.c:1443
0xa8c064 vect_analyze_loop_2
    ../../srcdir/gcc/tree-vect-loop.c:1720
0xa8c064 vect_analyze_loop(loop*)
    ../../srcdir/gcc/tree-vect-loop.c:1773
0xa9e06c vectorize_loops()
    ../../srcdir/gcc/tree-vectorizer.c:113
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