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_type *create_lowered_type(void)
64 if(lowered_type == NULL) {
65 lowered_type = new_type_primitive(new_id_from_str("__lowered_mode_b"),
71 static void adjust_method_type(ir_type *method_type)
77 n_params = get_method_n_params(method_type);
78 for(i = 0; i < n_params; ++i) {
79 ir_type *param = get_method_param_type(method_type, i);
80 if(get_type_mode(param) == mode_b) {
81 set_method_param_type(method_type, i, create_lowered_type());
85 n_res = get_method_n_ress(method_type);
86 for(i = 0; i < n_res; ++i) {
87 ir_type *res_type = get_method_res_type(method_type, i);
88 if(get_type_mode(res_type) == mode_b) {
89 set_method_res_type(method_type, i, create_lowered_type());
94 static ir_node *lower_node(ir_node *node)
96 ir_graph *irg = current_ir_graph;
97 dbg_info *dbgi = get_irn_dbg_info(node);
98 ir_op *op = get_irn_op(node);
99 ir_node *block = get_nodes_block(node);
102 assert(get_irn_mode(node) == mode_b);
104 res = get_irn_link(node);
108 /* TODO: be robust against phi-loops... */
112 ir_node *unknown, *new_phi;
114 arity = get_irn_arity(node);
115 in = alloca(arity * sizeof(in[0]));
116 unknown = new_Unknown(lowered_mode);
117 for(i = 0; i < arity; ++i) {
120 new_phi = new_rd_Phi(dbgi, irg, block, arity, in,
122 set_irn_link(node, new_phi);
124 for(i = 0; i < arity; ++i) {
125 ir_node *in = get_irn_n(node, i);
126 ir_node *low_in = lower_node(in);
128 set_irn_n(new_phi, i, low_in);
134 if(op == op_And || op == op_Or || op == op_Eor) {
136 ir_node *copy = exact_copy(node);
138 arity = get_irn_arity(node);
139 for(i = 0; i < arity; ++i) {
140 ir_node *in = get_irn_n(node, i);
141 ir_node *low_in = lower_node(in);
143 set_irn_n(copy, i, low_in);
145 set_irn_mode(copy, lowered_mode);
147 set_irn_link(node, copy);
151 ir_node *op = get_Not_op(node);
152 ir_node *low_op = lower_node(op);
154 res = create_not(dbgi, low_op);
155 set_irn_link(node, res);
159 ir_node *cond = get_Psi_cond(node, 0);
160 ir_node *low_cond = lower_node(cond);
161 ir_node *v_true = get_Psi_val(node, 0);
162 ir_node *low_v_true = lower_node(v_true);
163 ir_node *v_false = get_Psi_default(node);
164 ir_node *low_v_false = lower_node(v_false);
166 ir_node *and0 = new_rd_And(dbgi, irg, block, low_cond, low_v_true,
169 ir_node *not_cond = create_not(dbgi, low_cond);
171 ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false,
174 ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1,
177 set_irn_link(node, or);
181 tarval *tv_one = get_tarval_one(lowered_mode);
182 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
183 tarval *tv_zero = get_tarval_null(lowered_mode);
184 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
185 ir_node *pred = get_Conv_op(node);
186 ir_mode *mode = get_irn_mode(pred);
187 tarval *tv_zeroc = get_tarval_null(mode);
188 ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
190 ir_node *cmp = new_rd_Cmp(dbgi, irg, block, pred, zero_cmp);
191 ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
193 ir_node *vals[2] = { one, zero };
194 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals,
197 set_irn_link(node, psi);
201 ir_node *pred = get_Proj_pred(node);
204 ir_node *left = get_Cmp_left(pred);
205 ir_node *right = get_Cmp_right(pred);
206 ir_mode *mode = get_irn_mode(left);
208 if ((mode_is_int(mode) || mode_is_reference(mode)) &&
209 mode_is_signed(mode) && (
210 get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode) ||
211 (is_Const(right) && is_Const_null(right))
213 int pnc = get_Proj_proj(node);
218 if(pnc == pn_Cmp_Lt) {
219 /* a < b -> (a - b) >> 31 */
222 } else if(pnc == pn_Cmp_Le) {
223 /* a <= b -> ~(a - b) >> 31 */
227 } else if(pnc == pn_Cmp_Gt) {
228 /* a > b -> (b - a) >> 31 */
231 } else if(pnc == pn_Cmp_Ge) {
232 /* a >= b -> ~(a - b) >> 31 */
239 tarval *tv = new_tarval_from_long(31, mode_Iu);
240 ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
242 if(mode != lowered_mode) {
243 a = new_rd_Conv(dbgi, irg, block, a, lowered_mode);
244 b = new_rd_Conv(dbgi, irg, block, b, lowered_mode);
247 res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode);
249 res = new_rd_Not(dbgi, irg, block, res, lowered_mode);
251 res = new_rd_Shr(dbgi, irg, block, res, shift_cnt,
254 set_irn_link(node, res);
260 /* synthesize the 0/1 value */
261 tarval *tv_one = get_tarval_one(lowered_mode);
262 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
263 tarval *tv_zero = get_tarval_null(lowered_mode);
264 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
266 ir_node *vals[2] = { one, zero };
267 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals,
270 set_irn_link(node, psi);
273 } else if(is_Proj(pred) && is_Call(get_Proj_pred(pred))) {
274 ir_type *type = get_Call_type(get_Proj_pred(pred));
275 adjust_method_type(type);
276 set_irn_mode(node, lowered_mode);
278 } else if(is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
279 ir_entity *entity = get_irg_entity(irg);
280 ir_type *type = get_entity_type(entity);
281 adjust_method_type(type);
282 set_irn_mode(node, lowered_mode);
286 panic("unexpected projb: %+F (pred: %+F)", node, pred);
289 tarval *tv = get_Const_tarval(node);
290 if(tv == get_tarval_b_true()) {
291 tarval *tv_one = get_tarval_one(lowered_mode);
292 res = new_d_Const(dbgi, lowered_mode, tv_one);
293 } else if(tv == get_tarval_b_false()) {
294 tarval *tv_zero = get_tarval_null(lowered_mode);
295 res = new_d_Const(dbgi, lowered_mode, tv_zero);
297 panic("invalid boolean const %+F", node);
299 set_irn_link(node, res);
303 panic("didn't expect %+F to have mode_b", node);
306 static void lower_mode_b_walker(ir_node *node, void *env)
311 arity = get_irn_arity(node);
312 for(i = 0; i < arity; ++i) {
314 ir_node *in = get_irn_n(node, i);
315 if(get_irn_mode(in) != mode_b)
318 if(! lower_direct_cmp) {
320 || (is_Psi(node) && get_irn_mode(node) != mode_b)) {
322 ir_node *pred = get_Proj_pred(in);
329 lowered_in = lower_node(in);
331 if(is_Return(node)) {
332 ir_entity *entity = get_irg_entity(current_ir_graph);
333 ir_type *type = get_entity_type(entity);
334 adjust_method_type(type);
335 } else if(is_Call(node)) {
336 ir_type *type = get_Call_type(node);
337 adjust_method_type(type);
339 lowered_in = create_convb(lowered_in);
341 set_irn_n(node, i, lowered_in);
345 static void clear_links(ir_node *node, void *env)
348 set_irn_link(node, NULL);
351 void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
354 lower_direct_cmp = do_lower_direct_cmp;
355 set_using_irn_link(irg);
356 irg_walk_graph(irg, clear_links, NULL, NULL);
357 irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
358 clear_using_irn_link(irg);