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 *lower_node(ir_node *node)
55 ir_graph *irg = current_ir_graph;
56 dbg_info *dbgi = get_irn_dbg_info(node);
57 ir_op *op = get_irn_op(node);
58 ir_node *block = get_nodes_block(node);
61 assert(get_irn_mode(node) == mode_b);
63 res = get_irn_link(node);
67 /* TODO: be robust against phi-loops... */
71 ir_node *unknown, *new_phi;
73 arity = get_irn_arity(node);
74 in = alloca(arity * sizeof(in[0]));
75 unknown = new_Unknown(lowered_mode);
76 for(i = 0; i < arity; ++i) {
79 new_phi = new_rd_Phi(dbgi, irg, block, arity, in,
81 set_irn_link(node, new_phi);
83 for(i = 0; i < arity; ++i) {
84 ir_node *in = get_irn_n(node, i);
85 ir_node *low_in = lower_node(in);
87 set_irn_n(new_phi, i, low_in);
93 if(op == op_And || op == op_Or || op == op_Eor) {
95 ir_node *copy = exact_copy(node);
97 arity = get_irn_arity(node);
98 for(i = 0; i < arity; ++i) {
99 ir_node *in = get_irn_n(node, i);
100 ir_node *low_in = lower_node(in);
102 set_irn_n(copy, i, low_in);
104 set_irn_mode(copy, lowered_mode);
106 set_irn_link(node, copy);
110 ir_node *op = get_Not_op(node);
111 ir_node *low_op = lower_node(op);
113 res = create_not(dbgi, low_op);
114 set_irn_link(node, res);
118 ir_node *cond = get_Psi_cond(node, 0);
119 ir_node *low_cond = lower_node(cond);
120 ir_node *v_true = get_Psi_val(node, 0);
121 ir_node *low_v_true = lower_node(v_true);
122 ir_node *v_false = get_Psi_default(node);
123 ir_node *low_v_false = lower_node(v_false);
125 ir_node *and0 = new_rd_And(dbgi, irg, block, low_cond, low_v_true,
128 ir_node *not_cond = create_not(dbgi, low_cond);
130 ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false,
133 ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1,
136 set_irn_link(node, or);
140 tarval *tv_one = get_tarval_one(lowered_mode);
141 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
142 tarval *tv_zero = get_tarval_null(lowered_mode);
143 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
144 ir_mode *mode = get_irn_mode(node);
145 tarval *tv_zeroc = get_tarval_null(mode);
146 ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc);
148 ir_node *cmp = new_rd_Cmp(dbgi, irg, block, node, zero_cmp);
149 ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
151 ir_node *vals[2] = { one, zero };
152 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals,
155 set_irn_link(node, psi);
159 ir_node *pred = get_Proj_pred(node);
161 assert(!is_Load(pred));
163 ir_mode *mode = get_irn_mode(pred);
164 ir_node *left = get_Cmp_left(pred);
165 ir_node *right = get_Cmp_right(pred);
167 if( (mode_is_int(mode) || mode_is_reference(mode)) &&
168 (get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode)
169 || classify_Const(right) == CNST_NULL)) {
170 int pnc = get_Proj_proj(node);
175 if(pnc == pn_Cmp_Lt) {
176 /* a < b -> (a - b) >> 31 */
179 } else if(pnc == pn_Cmp_Le) {
180 /* a <= b -> ((a - b) >> 31) ^ 1 */
184 } else if(pnc == pn_Cmp_Gt) {
185 /* a > b -> (b - a) >> 31 */
188 } else if(pnc == pn_Cmp_Ge) {
189 /* a >= b -> ((a - b) >> 31) ^ 1 */
196 tarval *tv = new_tarval_from_long(31, mode_Iu);
197 ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv);
199 if(mode != lowered_mode) {
200 a = new_rd_Conv(dbgi, irg, block, a, lowered_mode);
201 b = new_rd_Conv(dbgi, irg, block, b, lowered_mode);
204 res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode);
205 res = new_rd_Shr(dbgi, irg, block, res, shift_cnt,
209 res = create_not(dbgi, res);
211 set_irn_link(node, res);
217 /* synthesize the 0/1 value */
218 tarval *tv_one = get_tarval_one(lowered_mode);
219 ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one);
220 tarval *tv_zero = get_tarval_null(lowered_mode);
221 ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero);
223 ir_node *vals[2] = { one, zero };
224 ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals,
227 set_irn_link(node, psi);
230 } else if (be_is_Barrier(pred)) {
235 panic("unexpected projb: %+F (pred: %+F)", node, pred);
238 tarval *tv = get_Const_tarval(node);
239 if(tv == get_tarval_b_true()) {
240 tarval *tv_one = get_tarval_one(lowered_mode);
241 res = new_d_Const(dbgi, lowered_mode, tv_one);
242 } else if(tv == get_tarval_b_false()) {
243 tarval *tv_zero = get_tarval_null(lowered_mode);
244 res = new_d_Const(dbgi, lowered_mode, tv_zero);
246 panic("invalid boolean const %+F", node);
248 set_irn_link(node, res);
252 panic("didn't expect %+F to have mode_b", node);
255 static ir_node *create_convb(ir_node *node)
257 ir_graph *irg = current_ir_graph;
258 ir_node *block = get_nodes_block(node);
259 ir_node *conv = new_rd_Conv(NULL, irg, block, node, mode_b);
264 static void lower_mode_b_walker(ir_node *node, void *env)
269 arity = get_irn_arity(node);
270 for(i = 0; i < arity; ++i) {
272 ir_node *in = get_irn_n(node, i);
273 if(get_irn_mode(in) != mode_b)
276 if(! lower_direct_cmp) {
278 || (is_Psi(node) && get_irn_mode(node) != mode_b)) {
280 ir_node *pred = get_Proj_pred(in);
287 lowered_in = lower_node(in);
288 lowered_in = create_convb(lowered_in);
289 set_irn_n(node, i, lowered_in);
293 static void clear_links(ir_node *node, void *env)
296 set_irn_link(node, NULL);
299 void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp)
302 lower_direct_cmp = do_lower_direct_cmp;
303 set_using_irn_link(irg);
304 irg_walk_graph(irg, clear_links, NULL, NULL);
305 irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
306 clear_using_irn_link(irg);