2 * Copyright (C) 1995-2008 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 * @brief Scheduling utilities for nodes in Blocks and Blocks.
23 * @author Sebastian Hack
31 #include "firm_types.h"
32 #include "irgraph_t.h"
33 #include "iredges_t.h"
42 #include "belistsched.h"
46 #include "lc_opts_enum.h"
49 #define SCHED_INITIAL_GRANULARITY (1 << 14)
51 static void sched_renumber(const ir_node *block)
55 sched_timestep_t step = SCHED_INITIAL_GRANULARITY;
57 sched_foreach(block, irn) {
58 inf = get_irn_sched_info(irn);
59 inf->time_step = step;
60 step += SCHED_INITIAL_GRANULARITY;
64 static inline void sched_set_time_stamp(const ir_node *irn)
66 sched_info_t *info = get_irn_sched_info(irn);
67 const sched_info_t *prev_info = get_irn_sched_info(info->prev);
68 const sched_info_t *next_info = get_irn_sched_info(info->next);
69 sched_timestep_t before_ts = prev_info->time_step;
70 sched_timestep_t after_ts = next_info->time_step;
73 * If we are the last, we can give us a big time step,
74 * else we have to compute our time step from our
77 if(before_ts >= after_ts) {
78 info->time_step = before_ts + SCHED_INITIAL_GRANULARITY;
80 if (info->time_step <= before_ts) {
81 sched_renumber(get_nodes_block(irn));
84 sched_timestep_t ts = (before_ts + after_ts) / 2;
87 * If the resolution went out, we have to renumber
90 if(ts == before_ts || ts == after_ts)
91 sched_renumber(get_nodes_block(irn));
97 void sched_add_before(ir_node *before, ir_node *irn)
99 sched_info_t *info = get_irn_sched_info(irn);
100 ir_node *next = before;
101 sched_info_t *next_info = get_irn_sched_info(next);
102 ir_node *prev = next_info->prev;
103 sched_info_t *prev_info = get_irn_sched_info(prev);
104 assert(sched_is_scheduled(before));
105 assert(!sched_is_scheduled(irn));
106 assert(!is_Proj(before));
107 assert(!is_Proj(irn));
111 prev_info->next = irn;
112 next_info->prev = irn;
113 sched_set_time_stamp(irn);
116 void sched_add_after(ir_node *after, ir_node *irn)
118 sched_info_t *info = get_irn_sched_info(irn);
119 ir_node *prev = after;
120 sched_info_t *prev_info = get_irn_sched_info(prev);
121 ir_node *next = prev_info->next;
122 sched_info_t *next_info = get_irn_sched_info(next);
123 assert(sched_is_scheduled(after));
124 assert(!sched_is_scheduled(irn));
125 assert(!is_Proj(after));
126 assert(!is_Proj(irn));
130 prev_info->next = irn;
131 next_info->prev = irn;
132 sched_set_time_stamp(irn);
135 void sched_remove(ir_node *irn)
137 sched_info_t *info = get_irn_sched_info(irn);
138 ir_node *prev = info->prev;
139 ir_node *next = info->next;
140 sched_info_t *prev_info = get_irn_sched_info(prev);
141 sched_info_t *next_info = get_irn_sched_info(next);
142 assert(sched_is_scheduled(irn));
144 prev_info->next = next;
145 next_info->prev = prev;
152 static be_module_list_entry_t *schedulers;
153 static schedule_func scheduler;
155 void be_register_scheduler(const char *name, schedule_func func)
157 if (scheduler == NULL)
159 be_add_module_to_list(&schedulers, name, func);
162 void be_schedule_graph(ir_graph *irg)
167 BE_REGISTER_MODULE_CONSTRUCTOR(be_init_sched)
168 void be_init_sched(void)
170 lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
171 be_add_module_list_opt(be_grp, "scheduler", "scheduling algorithm",
172 &schedulers, (void**)&scheduler);