2 * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @author Matthias Braun, Christoph Mallon
41 static ir_mode *lowered_mode = NULL;
42 static int lower_direct_cmp = 0;
43 static ir_type *lowered_type = NULL;
44 static pdeq *lowered_nodes = NULL;
47 * Removes a node if its out-edge count has reached 0.
48 * temporary hack until we have proper automatic dead code elimination.
50 static void maybe_kill_node(ir_node *node)
55 if(get_irn_n_edges(node) != 0)
58 irg = get_irn_irg(node);
60 assert(!is_Bad(node));
62 arity = get_irn_arity(node);
63 for (i = 0; i < arity; ++i) {
64 set_irn_n(node, i, new_Bad());
66 set_nodes_block(node, new_Bad());
68 edges_node_deleted(node, irg);
71 static ir_node *create_not(dbg_info *dbgi, ir_node *node)
73 ir_graph *irg = current_ir_graph;
74 ir_node *block = get_nodes_block(node);
75 tarval *tv_one = get_tarval_one(lowered_mode);
76 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
78 return new_rd_Eor(dbgi, irg, block, node, one, lowered_mode);
81 static ir_node *create_convb(ir_node *node)
83 ir_graph *irg = current_ir_graph;
84 ir_node *block = get_nodes_block(node);
85 ir_node *conv = new_rd_Conv(NULL, irg, block, node, mode_b);
90 static ir_type *create_lowered_type(void)
92 if(lowered_type == NULL) {
93 lowered_type = new_type_primitive(new_id_from_str("__lowered_mode_b"),
99 static void adjust_method_type(ir_type *method_type)
105 n_params = get_method_n_params(method_type);
106 for(i = 0; i < n_params; ++i) {
107 ir_type *param = get_method_param_type(method_type, i);
108 if(get_type_mode(param) == mode_b) {
109 set_method_param_type(method_type, i, create_lowered_type());
113 n_res = get_method_n_ress(method_type);
114 for(i = 0; i < n_res; ++i) {
115 ir_type *res_type = get_method_res_type(method_type, i);
116 if(get_type_mode(res_type) == mode_b) {
117 set_method_res_type(method_type, i, create_lowered_type());
122 static ir_node *lower_node(ir_node *node)
124 ir_graph *irg = current_ir_graph;
125 dbg_info *dbgi = get_irn_dbg_info(node);
126 ir_op *op = get_irn_op(node);
127 ir_node *block = get_nodes_block(node);
130 assert(get_irn_mode(node) == mode_b);
132 res = get_irn_link(node);
136 /* TODO: be robust against phi-loops... */
140 ir_node *unknown, *new_phi;
142 arity = get_irn_arity(node);
143 in = alloca(arity * sizeof(in[0]));
144 unknown = new_Unknown(lowered_mode);
145 for(i = 0; i < arity; ++i) {
148 new_phi = new_rd_Phi(dbgi, irg, block, arity, in,
150 set_irn_link(node, new_phi);
151 pdeq_putr(lowered_nodes, node);
153 for(i = 0; i < arity; ++i) {
154 ir_node *in = get_irn_n(node, i);
155 ir_node *low_in = lower_node(in);
157 set_irn_n(new_phi, i, low_in);
163 if(op == op_And || op == op_Or || op == op_Eor) {
165 ir_node *copy = exact_copy(node);
167 arity = get_irn_arity(node);
168 for(i = 0; i < arity; ++i) {
169 ir_node *in = get_irn_n(node, i);
170 ir_node *low_in = lower_node(in);
172 set_irn_n(copy, i, low_in);
174 set_irn_mode(copy, lowered_mode);
176 set_irn_link(node, copy);
177 pdeq_putr(lowered_nodes, node);
181 ir_node *op = get_Not_op(node);
182 ir_node *low_op = lower_node(op);
184 res = create_not(dbgi, low_op);
185 set_irn_link(node, res);
186 pdeq_putr(lowered_nodes, node);
190 ir_node *cond = get_Psi_cond(node, 0);
191 ir_node *low_cond = lower_node(cond);
192 ir_node *v_true = get_Psi_val(node, 0);
193 ir_node *low_v_true = lower_node(v_true);
194 ir_node *v_false = get_Psi_default(node);
195 ir_node *low_v_false = lower_node(v_false);
197 ir_node *and0 = new_rd_And(dbgi, irg, block, low_cond, low_v_true,
200 ir_node *not_cond = create_not(dbgi, low_cond);
202 ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false,
205 ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1,
208 set_irn_link(node, or);
209 pdeq_putr(lowered_nodes, node);
213 tarval *tv_one = get_tarval_one(lowered_mode);
214 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
215 tarval *tv_zero = get_tarval_null(lowered_mode);
216 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
217 ir_node *pred = get_Conv_op(node);
218 ir_mode *mode = get_irn_mode(pred);
219 tarval *tv_zeroc = get_tarval_null(mode);
220 ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
222 ir_node *cmp = new_rd_Cmp(dbgi, irg, block, pred, zero_cmp);
223 ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
225 ir_node *vals[2] = { one, zero };
226 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals,
229 set_irn_link(node, psi);
230 pdeq_putr(lowered_nodes, node);
234 ir_node *pred = get_Proj_pred(node);
237 ir_node *left = get_Cmp_left(pred);
238 ir_node *right = get_Cmp_right(pred);
239 ir_mode *mode = get_irn_mode(left);
241 if ((mode_is_int(mode) || mode_is_reference(mode)) && (
242 get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode) ||
243 (mode_is_signed(mode) && is_Const(right) && is_Const_null(right))
245 int pnc = get_Proj_proj(node);
250 if(pnc == pn_Cmp_Lt) {
251 /* a < b -> (a - b) >> 31 */
254 } else if(pnc == pn_Cmp_Le) {
255 /* a <= b -> ~(a - b) >> 31 */
259 } else if(pnc == pn_Cmp_Gt) {
260 /* a > b -> (b - a) >> 31 */
263 } else if(pnc == pn_Cmp_Ge) {
264 /* a >= b -> ~(a - b) >> 31 */
271 tarval *tv = new_tarval_from_long(get_mode_size_bits(lowered_mode) - 1, mode_Iu);
272 ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
274 if(mode != lowered_mode) {
275 a = new_rd_Conv(dbgi, irg, block, a, lowered_mode);
276 b = new_rd_Conv(dbgi, irg, block, b, lowered_mode);
279 res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode);
281 res = new_rd_Not(dbgi, irg, block, res, lowered_mode);
283 res = new_rd_Shr(dbgi, irg, block, res, shift_cnt,
286 set_irn_link(node, res);
287 pdeq_putr(lowered_nodes, node);
293 /* synthesize the 0/1 value */
294 tarval *tv_one = get_tarval_one(lowered_mode);
295 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
296 tarval *tv_zero = get_tarval_null(lowered_mode);
297 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
299 ir_node *vals[2] = { one, zero };
300 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals,
303 set_irn_link(node, psi);
304 pdeq_putr(lowered_nodes, node);
307 } else if(is_Proj(pred) && is_Call(get_Proj_pred(pred))) {
308 ir_type *type = get_Call_type(get_Proj_pred(pred));
309 adjust_method_type(type);
310 set_irn_mode(node, lowered_mode);
312 } else if(is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
313 ir_entity *entity = get_irg_entity(irg);
314 ir_type *type = get_entity_type(entity);
315 adjust_method_type(type);
316 set_irn_mode(node, lowered_mode);
320 panic("unexpected projb: %+F (pred: %+F)", node, pred);
323 tarval *tv = get_Const_tarval(node);
324 if(tv == get_tarval_b_true()) {
325 tarval *tv_one = get_tarval_one(lowered_mode);
326 res = new_d_Const(dbgi, lowered_mode, tv_one);
327 } else if(tv == get_tarval_b_false()) {
328 tarval *tv_zero = get_tarval_null(lowered_mode);
329 res = new_d_Const(dbgi, lowered_mode, tv_zero);
331 panic("invalid boolean const %+F", node);
333 set_irn_link(node, res);
334 pdeq_putr(lowered_nodes, node);
338 panic("didn't expect %+F to have mode_b", node);
341 static void lower_mode_b_walker(ir_node *node, void *env)
346 arity = get_irn_arity(node);
347 for(i = 0; i < arity; ++i) {
349 ir_node *in = get_irn_n(node, i);
350 if(get_irn_mode(in) != mode_b)
353 if(! lower_direct_cmp) {
355 || (is_Psi(node) && get_irn_mode(node) != mode_b)) {
357 ir_node *pred = get_Proj_pred(in);
364 lowered_in = lower_node(in);
366 if(is_Return(node)) {
367 ir_entity *entity = get_irg_entity(current_ir_graph);
368 ir_type *type = get_entity_type(entity);
369 adjust_method_type(type);
370 } else if(is_Call(node)) {
371 ir_type *type = get_Call_type(node);
372 adjust_method_type(type);
374 lowered_in = create_convb(lowered_in);
376 set_irn_n(node, i, lowered_in);
380 static void clear_links(ir_node *node, void *env)
383 set_irn_link(node, NULL);
386 void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
389 lower_direct_cmp = do_lower_direct_cmp;
390 lowered_nodes = new_pdeq();
391 set_using_irn_link(irg);
393 irg_walk_graph(irg, clear_links, NULL, NULL);
394 irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
396 while(!pdeq_empty(lowered_nodes)) {
397 ir_node *node = (ir_node*) pdeq_getr(lowered_nodes);
398 maybe_kill_node(node);
400 del_pdeq(lowered_nodes);
402 clear_using_irn_link(irg);