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
39 static ir_mode *lowered_mode = NULL;
40 static int lower_direct_cmp = 0;
41 static ir_type *lowered_type = NULL;
43 static ir_node *create_not(dbg_info *dbgi, ir_node *node)
45 ir_graph *irg = current_ir_graph;
46 ir_node *block = get_nodes_block(node);
47 tarval *tv_one = get_tarval_one(lowered_mode);
48 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
50 return new_rd_Eor(dbgi, irg, block, node, one, lowered_mode);
53 static ir_node *create_convb(ir_node *node)
55 ir_graph *irg = current_ir_graph;
56 ir_node *block = get_nodes_block(node);
57 ir_node *conv = new_rd_Conv(NULL, irg, block, node, mode_b);
62 static ir_node *create_conv_lowered_mode(ir_node *node)
64 ir_graph *irg = current_ir_graph;
65 ir_node *block = get_nodes_block(node);
66 ir_node *conv = new_rd_Conv(NULL, irg, block, node, lowered_mode);
71 static ir_type *create_lowered_type(void)
73 if(lowered_type == NULL) {
74 lowered_type = new_type_primitive(new_id_from_str("__lowered_mode_b"),
80 static void adjust_method_type(ir_type *method_type)
86 n_params = get_method_n_params(method_type);
87 for(i = 0; i < n_params; ++i) {
88 ir_type *param = get_method_param_type(method_type, i);
89 if(get_type_mode(param) == mode_b) {
90 set_method_param_type(method_type, i, create_lowered_type());
94 n_res = get_method_n_ress(method_type);
95 for(i = 0; i < n_res; ++i) {
96 ir_type *res_type = get_method_res_type(method_type, i);
97 if(get_type_mode(res_type) == mode_b) {
98 set_method_res_type(method_type, i, create_lowered_type());
103 static ir_node *lower_node(ir_node *node)
105 ir_graph *irg = current_ir_graph;
106 dbg_info *dbgi = get_irn_dbg_info(node);
107 ir_op *op = get_irn_op(node);
108 ir_node *block = get_nodes_block(node);
111 assert(get_irn_mode(node) == mode_b);
113 res = get_irn_link(node);
117 /* TODO: be robust against phi-loops... */
121 ir_node *unknown, *new_phi;
123 arity = get_irn_arity(node);
124 in = alloca(arity * sizeof(in[0]));
125 unknown = new_Unknown(lowered_mode);
126 for(i = 0; i < arity; ++i) {
129 new_phi = new_rd_Phi(dbgi, irg, block, arity, in,
131 set_irn_link(node, new_phi);
133 for(i = 0; i < arity; ++i) {
134 ir_node *in = get_irn_n(node, i);
135 ir_node *low_in = lower_node(in);
137 set_irn_n(new_phi, i, low_in);
143 if(op == op_And || op == op_Or || op == op_Eor) {
145 ir_node *copy = exact_copy(node);
147 arity = get_irn_arity(node);
148 for(i = 0; i < arity; ++i) {
149 ir_node *in = get_irn_n(node, i);
150 ir_node *low_in = lower_node(in);
152 set_irn_n(copy, i, low_in);
154 set_irn_mode(copy, lowered_mode);
156 set_irn_link(node, copy);
160 ir_node *op = get_Not_op(node);
161 ir_node *low_op = lower_node(op);
163 res = create_not(dbgi, low_op);
164 set_irn_link(node, res);
168 ir_node *cond = get_Psi_cond(node, 0);
169 ir_node *low_cond = lower_node(cond);
170 ir_node *v_true = get_Psi_val(node, 0);
171 ir_node *low_v_true = lower_node(v_true);
172 ir_node *v_false = get_Psi_default(node);
173 ir_node *low_v_false = lower_node(v_false);
175 ir_node *and0 = new_rd_And(dbgi, irg, block, low_cond, low_v_true,
178 ir_node *not_cond = create_not(dbgi, low_cond);
180 ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false,
183 ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1,
186 set_irn_link(node, or);
190 tarval *tv_one = get_tarval_one(lowered_mode);
191 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
192 tarval *tv_zero = get_tarval_null(lowered_mode);
193 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
194 ir_node *pred = get_Conv_op(node);
195 ir_mode *mode = get_irn_mode(pred);
196 tarval *tv_zeroc = get_tarval_null(mode);
197 ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
199 ir_node *cmp = new_rd_Cmp(dbgi, irg, block, pred, zero_cmp);
200 ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
202 ir_node *vals[2] = { one, zero };
203 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals,
206 set_irn_link(node, psi);
210 ir_node *pred = get_Proj_pred(node);
213 ir_node *left = get_Cmp_left(pred);
214 ir_node *right = get_Cmp_right(pred);
215 ir_mode *mode = get_irn_mode(left);
217 if ((mode_is_int(mode) || mode_is_reference(mode)) && (
218 get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode) ||
219 (is_Const(right) && is_Const_null(right))
221 int pnc = get_Proj_proj(node);
226 if(pnc == pn_Cmp_Lt) {
227 /* a < b -> (a - b) >> 31 */
230 } else if(pnc == pn_Cmp_Le) {
231 /* a <= b -> ((a - b) >> 31) ^ 1 */
235 } else if(pnc == pn_Cmp_Gt) {
236 /* a > b -> (b - a) >> 31 */
239 } else if(pnc == pn_Cmp_Ge) {
240 /* a >= b -> ((a - b) >> 31) ^ 1 */
247 tarval *tv = new_tarval_from_long(31, mode_Iu);
248 ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
250 if(mode != lowered_mode) {
251 a = new_rd_Conv(dbgi, irg, block, a, lowered_mode);
252 b = new_rd_Conv(dbgi, irg, block, b, lowered_mode);
255 res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode);
256 res = new_rd_Shr(dbgi, irg, block, res, shift_cnt,
260 res = create_not(dbgi, res);
262 set_irn_link(node, res);
268 /* synthesize the 0/1 value */
269 tarval *tv_one = get_tarval_one(lowered_mode);
270 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
271 tarval *tv_zero = get_tarval_null(lowered_mode);
272 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
274 ir_node *vals[2] = { one, zero };
275 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals,
278 set_irn_link(node, psi);
281 } else if(is_Proj(pred) && is_Call(get_Proj_pred(pred))) {
282 ir_type *type = get_Call_type(get_Proj_pred(pred));
283 adjust_method_type(type);
284 set_irn_mode(node, lowered_mode);
286 } else if(is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
287 ir_entity *entity = get_irg_entity(irg);
288 ir_type *type = get_entity_type(entity);
289 adjust_method_type(type);
290 set_irn_mode(node, lowered_mode);
294 panic("unexpected projb: %+F (pred: %+F)", node, pred);
297 tarval *tv = get_Const_tarval(node);
298 if(tv == get_tarval_b_true()) {
299 tarval *tv_one = get_tarval_one(lowered_mode);
300 res = new_d_Const(dbgi, lowered_mode, tv_one);
301 } else if(tv == get_tarval_b_false()) {
302 tarval *tv_zero = get_tarval_null(lowered_mode);
303 res = new_d_Const(dbgi, lowered_mode, tv_zero);
305 panic("invalid boolean const %+F", node);
307 set_irn_link(node, res);
311 panic("didn't expect %+F to have mode_b", node);
314 static void lower_mode_b_walker(ir_node *node, void *env)
319 arity = get_irn_arity(node);
320 for(i = 0; i < arity; ++i) {
322 ir_node *in = get_irn_n(node, i);
323 if(get_irn_mode(in) != mode_b)
326 if(! lower_direct_cmp) {
328 || (is_Psi(node) && get_irn_mode(node) != mode_b)) {
330 ir_node *pred = get_Proj_pred(in);
337 lowered_in = lower_node(in);
339 if(is_Return(node)) {
340 ir_entity *entity = get_irg_entity(current_ir_graph);
341 ir_type *type = get_entity_type(entity);
342 adjust_method_type(type);
343 } else if(is_Call(node)) {
344 ir_type *type = get_Call_type(node);
345 adjust_method_type(type);
347 lowered_in = create_convb(lowered_in);
349 set_irn_n(node, i, lowered_in);
353 static void clear_links(ir_node *node, void *env)
356 set_irn_link(node, NULL);
359 void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
362 lower_direct_cmp = do_lower_direct_cmp;
363 set_using_irn_link(irg);
364 irg_walk_graph(irg, clear_links, NULL, NULL);
365 irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
366 clear_using_irn_link(irg);