/**
* Checks whether node high is a sign extension of low.
*/
static bool is_sign_extend(ir_node *low, ir_node *high)
{
if (is_Shrs(high)) {
ir_node *high_r = get_Shrs_right(high);
if (!is_Const(high_r)) return false;
ir_tarval *shift_count = get_Const_tarval(high_r);
if (!tarval_is_long(shift_count)) return false;
if (get_tarval_long(shift_count) != 31) return false;
ir_node *high_l = get_Shrs_left(high);
if (is_Conv(low) && get_Conv_op(low) == high_l) return true;
if (is_Conv(high_l) && get_Conv_op(high_l) == low) return true;
} else if (is_Const(low) && is_Const(high)) {
ir_tarval *tl = get_Const_tarval(low);
ir_tarval *th = get_Const_tarval(high);
if (tarval_is_long(th) && tarval_is_long(tl)) {
long l = get_tarval_long(tl);
long h = get_tarval_long(th);
return (h == 0 && l >= 0) || (h == -1 && l < 0);
}
}
return false;
}
void ConvHandler::cleanUp(Node node)
{
if (is_Conv(node))
{
Node child = node.getChild(0);
if (/*is_Conv(child) && */ node.getMode() == child.getMode())
replaceNode(node, child);
else if (is_Const(child))
replaceNode(node, new_r_Const_long(irg, node.getMode(), child.getTarval().getLong()));
else if (is_Conv(child))
set_irn_n(node, 0, child.getChild(0));
}
}
