[Bug tree-optimization/54920] [4.8 Regression] segfault in tree-ssa-pre.c during Firefox build

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54920

Marc Glisse <glisse at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |glisse at gcc dot gnu.org

--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> 2012-10-14 08:26:54 UTC ---
In create_expression_by_pieces, I see this:

    case NARY:
      {
        vn_nary_op_t nary = PRE_EXPR_NARY (expr);
        tree genop[4];
        unsigned i;
        for (i = 0; i < nary->length; ++i)
          {
            genop[i] = find_or_generate_expression (block, nary->op[i], stmts);

Does that mean 4 is an upper bound on the size of an nary?