+/*
+ * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
/**
- * Base routines for register allocation.
- * @author Sebastian Hack
- * @date 22.11.2004
+ * @file
+ * @brief Base routines for register allocation.
+ * @author Sebastian Hack
+ * @date 22.11.2004
+ * @version $Id$
*/
-#ifdef HAVE_CONFIG_H
#include "config.h"
-#endif
+
+#include <stdlib.h>
#include "pset.h"
#include "impl.h"
#include "irnode.h"
#include "irmode.h"
#include "irdom.h"
+#include "iredges.h"
+#include "bera.h"
+#include "beutil.h"
#include "besched_t.h"
#include "belive_t.h"
+#include "bemodule.h"
-static INLINE int values_interfere_dom(const ir_node *a, const ir_node *b)
-{
- const ir_node *b1 = get_nodes_block(a);
- const ir_node *b2 = get_nodes_block(b);
- int lo_a, lo_b;
-
- assert(block_dominates(b1, b2));
-
- /*
- * if the two blocks are not equal, a and b can only interfere if a is
- * live in at b2.
- */
- if(b1 != b2 && !is_live_in(b2, a))
- return 0;
-
- lo_a = is_live_end(b2, a);
- lo_b = is_live_end(b2, b);
-
- /*
- * If the two blocks are the same and one value is live out and the
- * definition of the other is after the definition ov the live out
- * value, they interfere.
- */
- if(b1 == b2) {
- int pos_a = sched_get_time_step(a);
- int pos_b = sched_get_time_step(b);
-
- if((pos_a < pos_b && lo_a) || (pos_b < pos_a && lo_b))
- return 1;
- }
-
- /*
- * Now it is left to check, if the sequence from the last use of 'b'
- * (or the end of the block b2, if b is live out)
- * to the def of 'b' contains a use and NOT the def of 'a'. Then they
- * also interfere
- */
- {
- const ir_node *irn;
+/** The list of register allocators */
+static be_module_list_entry_t *register_allocators = NULL;
+static be_ra_t *selected_allocator = NULL;
- /* Initialize the liveness. */
- int a_live = lo_a;
- int b_live = lo_b;
-
- /* Go from the end of block b2 and try to detect the liveness. */
- sched_foreach_reverse(b2, irn) {
- int i, n;
-
- /*
- * If the definition of 'a' was found 'a' and 'b' interfere, if
- * 'b' is live here.
- */
- if(irn == a)
- return b_live;
-
- /* Same goes for 'b'. */
- if(irn == b)
- return a_live;
-
- /* If 'a' is not yet live, search for a use. */
- if(!a_live) {
- for(i = 0, n = get_irn_arity(irn); i < n; ++i)
- if(get_irn_n(irn, i) == a) {
- a_live = 1;
- break;
- }
- }
-
- /* Same for 'b' */
- if(!b_live) {
- for(i = 0, n = get_irn_arity(irn); i < n; ++i)
- if(get_irn_n(irn, i) == b) {
- b_live = 1;
- break;
- }
- }
+void be_register_allocator(const char *name, be_ra_t *allocator)
+{
+ if(selected_allocator == NULL)
+ selected_allocator = allocator;
+ be_add_module_to_list(®ister_allocators, name, allocator);
+}
- }
+void be_allocate_registers(be_irg_t *birg)
+{
+ assert(selected_allocator != NULL);
+ if(selected_allocator != NULL) {
+ selected_allocator->allocate(birg);
}
-
- assert(0 && "You may never reach this place");
-
- /* This is never reached */
- return 0;
}
-int values_interfere(const ir_node *a, const ir_node *b)
+void be_init_ra(void)
{
- const ir_node *b1 = get_nodes_block(a);
- const ir_node *b2 = get_nodes_block(b);
+ lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
- if(block_dominates(b1, b2))
- return values_interfere_dom(a, b);
- else if(block_dominates(b2, b1))
- return values_interfere_dom(b, a);
- else
- return 0;
+ be_add_module_list_opt(be_grp, "regalloc", "register allocator",
+ ®ister_allocators, (void**) &selected_allocator);
}
+BE_REGISTER_MODULE_CONSTRUCTOR(init_be_ra);
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