unconditional gen_rtx_MULT in expr.c

[DJ Delorie]

expr.c line 8139 has this:


      /* Attempt to return something suitable for generating an
         indexed address, for machines that support that.  */

      if (modifier == EXPAND_SUM && mode == ptr_mode
          && host_integerp (treeop1, 0))
        {
          tree exp1 = treeop1;

          op0 = expand_expr (treeop0, subtarget, VOIDmode,
                             EXPAND_SUM);

          if (!REG_P (op0))
            op0 = force_operand (op0, NULL_RTX);
          if (!REG_P (op0))
            op0 = copy_to_mode_reg (mode, op0);

          return REDUCE_BIT_FIELD (gen_rtx_MULT (mode, op0,
                               gen_int_mode (tree_low_cst (exp1, 0),
                                             TYPE_MODE (TREE_TYPE (exp1)))));
        }

Why isn't there a check to see if the machine actually supports that
MULT before blindly generating it?  The expand_mult() that follows is
able to handle that case if the machine doesn't have indexed addresses
or a real MUL insn.