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
40 static ir_mode *lowered_mode = NULL;
41 static int lower_direct_cmp = 0;
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_node *lower_node(ir_node *node)
73 ir_graph *irg = current_ir_graph;
74 dbg_info *dbgi = get_irn_dbg_info(node);
75 ir_op *op = get_irn_op(node);
76 ir_node *block = get_nodes_block(node);
79 assert(get_irn_mode(node) == mode_b);
81 res = get_irn_link(node);
85 /* TODO: be robust against phi-loops... */
89 ir_node *unknown, *new_phi;
91 arity = get_irn_arity(node);
92 in = alloca(arity * sizeof(in[0]));
93 unknown = new_Unknown(lowered_mode);
94 for(i = 0; i < arity; ++i) {
97 new_phi = new_rd_Phi(dbgi, irg, block, arity, in,
99 set_irn_link(node, new_phi);
101 for(i = 0; i < arity; ++i) {
102 ir_node *in = get_irn_n(node, i);
103 ir_node *low_in = lower_node(in);
105 set_irn_n(new_phi, i, low_in);
111 if(op == op_And || op == op_Or || op == op_Eor) {
113 ir_node *copy = exact_copy(node);
115 arity = get_irn_arity(node);
116 for(i = 0; i < arity; ++i) {
117 ir_node *in = get_irn_n(node, i);
118 ir_node *low_in = lower_node(in);
120 set_irn_n(copy, i, low_in);
122 set_irn_mode(copy, lowered_mode);
124 set_irn_link(node, copy);
128 ir_node *op = get_Not_op(node);
129 ir_node *low_op = lower_node(op);
131 res = create_not(dbgi, low_op);
132 set_irn_link(node, res);
136 ir_node *cond = get_Psi_cond(node, 0);
137 ir_node *low_cond = lower_node(cond);
138 ir_node *v_true = get_Psi_val(node, 0);
139 ir_node *low_v_true = lower_node(v_true);
140 ir_node *v_false = get_Psi_default(node);
141 ir_node *low_v_false = lower_node(v_false);
143 ir_node *and0 = new_rd_And(dbgi, irg, block, low_cond, low_v_true,
146 ir_node *not_cond = create_not(dbgi, low_cond);
148 ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false,
151 ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1,
154 set_irn_link(node, or);
158 tarval *tv_one = get_tarval_one(lowered_mode);
159 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
160 tarval *tv_zero = get_tarval_null(lowered_mode);
161 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
162 ir_node *pred = get_Conv_op(node);
163 ir_mode *mode = get_irn_mode(pred);
164 tarval *tv_zeroc = get_tarval_null(mode);
165 ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
167 ir_node *cmp = new_rd_Cmp(dbgi, irg, block, pred, zero_cmp);
168 ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
170 ir_node *vals[2] = { one, zero };
171 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals,
174 set_irn_link(node, psi);
178 ir_node *pred = get_Proj_pred(node);
181 ir_node *left = get_Cmp_left(pred);
182 ir_node *right = get_Cmp_right(pred);
183 ir_mode *mode = get_irn_mode(left);
185 if( (mode_is_int(mode) || mode_is_reference(mode)) &&
186 (get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode)
187 || classify_Const(right) == CNST_NULL)) {
188 int pnc = get_Proj_proj(node);
193 if(pnc == pn_Cmp_Lt) {
194 /* a < b -> (a - b) >> 31 */
197 } else if(pnc == pn_Cmp_Le) {
198 /* a <= b -> ((a - b) >> 31) ^ 1 */
202 } else if(pnc == pn_Cmp_Gt) {
203 /* a > b -> (b - a) >> 31 */
206 } else if(pnc == pn_Cmp_Ge) {
207 /* a >= b -> ((a - b) >> 31) ^ 1 */
214 tarval *tv = new_tarval_from_long(31, mode_Iu);
215 ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
217 if(mode != lowered_mode) {
218 a = new_rd_Conv(dbgi, irg, block, a, lowered_mode);
219 b = new_rd_Conv(dbgi, irg, block, b, lowered_mode);
222 res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode);
223 res = new_rd_Shr(dbgi, irg, block, res, shift_cnt,
227 res = create_not(dbgi, res);
229 set_irn_link(node, res);
235 /* synthesize the 0/1 value */
236 tarval *tv_one = get_tarval_one(lowered_mode);
237 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
238 tarval *tv_zero = get_tarval_null(lowered_mode);
239 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
241 ir_node *vals[2] = { one, zero };
242 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals,
245 set_irn_link(node, psi);
248 } else if(is_Proj(pred) && is_Call(get_Proj_pred(pred))) {
249 return create_conv_lowered_mode(node);
250 } else if(is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
251 return create_conv_lowered_mode(node);
252 } else if (be_is_Barrier(pred)) {
257 panic("unexpected projb: %+F (pred: %+F)", node, pred);
260 tarval *tv = get_Const_tarval(node);
261 if(tv == get_tarval_b_true()) {
262 tarval *tv_one = get_tarval_one(lowered_mode);
263 res = new_d_Const(dbgi, lowered_mode, tv_one);
264 } else if(tv == get_tarval_b_false()) {
265 tarval *tv_zero = get_tarval_null(lowered_mode);
266 res = new_d_Const(dbgi, lowered_mode, tv_zero);
268 panic("invalid boolean const %+F", node);
270 set_irn_link(node, res);
274 panic("didn't expect %+F to have mode_b", node);
277 static void lower_mode_b_walker(ir_node *node, void *env)
282 arity = get_irn_arity(node);
283 for(i = 0; i < arity; ++i) {
285 ir_node *in = get_irn_n(node, i);
286 if(get_irn_mode(in) != mode_b)
289 if(! lower_direct_cmp) {
291 || (is_Psi(node) && get_irn_mode(node) != mode_b)) {
293 ir_node *pred = get_Proj_pred(in);
300 lowered_in = lower_node(in);
301 lowered_in = create_convb(lowered_in);
302 set_irn_n(node, i, lowered_in);
306 static void clear_links(ir_node *node, void *env)
309 set_irn_link(node, NULL);
312 void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
315 lower_direct_cmp = do_lower_direct_cmp;
316 set_using_irn_link(irg);
317 irg_walk_graph(irg, clear_links, NULL, NULL);
318 irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
319 clear_using_irn_link(irg);