+static void prepare_links_and_handle_rotl(ir_node *node, void *env) {
+ lower_env_t *lenv = env;
+
+ if (is_Rotl(node)) {
+ ir_mode *mode = get_irn_op_mode(node);
+ if (mode == lenv->params->high_signed ||
+ mode == lenv->params->high_unsigned) {
+ ir_node *right = get_Rotl_right(node);
+ ir_node *left, *shl, *shr, *or, *block, *sub, *c;
+ ir_mode *omode, *rmode;
+ ir_graph *irg;
+ dbg_info *dbg;
+ optimization_state_t state;
+
+ if (get_mode_arithmetic(mode) == irma_twos_complement && is_Const(right)) {
+ tarval *tv = get_Const_tarval(right);
+
+ if (tarval_is_long(tv) &&
+ get_tarval_long(tv) == (long)get_mode_size_bits(mode)) {
+ /* will be optimized in lower_Rotl() */
+ return;
+ }
+ }
+
+ /* replace the Rotl(x,y) by an Or(Shl(x,y), Shr(x,64-y)) and lower those */
+ dbg = get_irn_dbg_info(node);
+ omode = get_irn_mode(node);
+ left = get_Rotl_left(node);
+ irg = current_ir_graph;
+ block = get_nodes_block(node);
+ shl = new_rd_Shl(dbg, irg, block, left, right, omode);
+ rmode = get_irn_mode(right);
+ c = new_Const_long(rmode, get_mode_size_bits(omode));
+ sub = new_rd_Sub(dbg, irg, block, c, right, rmode);
+ shr = new_rd_Shr(dbg, irg, block, left, sub, omode);
+
+ /* optimization must be switched off here, or we will get the Rotl back */
+ save_optimization_state(&state);
+ set_opt_algebraic_simplification(0);
+ or = new_rd_Or(dbg, irg, block, shl, shr, omode);
+ restore_optimization_state(&state);
+
+ exchange(node, or);
+
+ /* do lowering on the new nodes */
+ prepare_links(shl, env);
+ prepare_links(c, env);
+ prepare_links(sub, env);
+ prepare_links(shr, env);
+ prepare_links(or, env);
+ }
+ } else {
+ prepare_links(node, env);
+ }
+}