From 391d038495706070a79f042b2928eea7936c8f33 Mon Sep 17 00:00:00 2001
From: Sebastian Hack <hack@ipd.info.uni-karlsruhe.de>
Date: Fri, 17 Mar 2006 09:37:53 +0000
Subject: [PATCH] Moved several functions here.

---
 ir/be/belive.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++
 ir/be/belive.h | 36 +++++++++++++++++++++++++++++
 2 files changed, 97 insertions(+)

diff --git a/ir/be/belive.c b/ir/be/belive.c
index d49d09b76..6d4724491 100644
--- a/ir/be/belive.c
+++ b/ir/be/belive.c
@@ -14,6 +14,9 @@
 
 #include "beutil.h"
 #include "belive_t.h"
+#include "besched_t.h"
+
+#define DBG_MODULE "firm.be.liveness"
 
 FIRM_IMPL2(is_live_in, int, const ir_node *, const ir_node *)
 FIRM_IMPL2(is_live_out, int, const ir_node *, const ir_node *)
@@ -267,3 +270,61 @@ void be_check_dominance(ir_graph *irg)
 {
 	irg_walk_graph(irg, dom_check, NULL, NULL);
 }
+
+pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live)
+{
+	firm_dbg_module_t *dbg = firm_dbg_register(DBG_MODULE);
+	int i, n;
+	ir_node *x;
+
+	DBG((dbg, LEVEL_1, "%+F\n", irn));
+	for(x = pset_first(live); x; x = pset_next(live))
+		DBG((dbg, LEVEL_1, "\tlive: %+F\n", x));
+
+	if(arch_irn_consider_in_reg_alloc(arch_env, cls, irn))
+		pset_remove_ptr(live, irn);
+
+	for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+		ir_node *op = get_irn_n(irn, i);
+
+		if(arch_irn_consider_in_reg_alloc(arch_env, cls, op))
+			pset_insert_ptr(live, op);
+	}
+
+	return live;
+}
+
+pset *be_liveness_end_of_block(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live)
+{
+	irn_live_t *li;
+
+	live_foreach(bl, li) {
+		ir_node *irn = (ir_node *) li->irn;
+		if(live_is_end(li) && arch_irn_consider_in_reg_alloc(arch_env, cls, irn))
+			pset_insert_ptr(live, irn);
+	}
+
+	return live;
+}
+
+pset *be_liveness_nodes_live_at(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live)
+{
+	firm_dbg_module_t *dbg = firm_dbg_register(DBG_MODULE);
+	const ir_node *bl      = is_Block(pos) ? pos : get_nodes_block(pos);
+	ir_node *irn;
+
+	be_liveness_end_of_block(arch_env, cls, bl, live);
+
+	sched_foreach_reverse(bl, irn) {
+		/*
+		 * If we encounter the node we want to insert the Perm after,
+		 * exit immediately, so that this node is still live
+		 */
+		if(irn == pos)
+			return live;
+
+		be_liveness_transfer(arch_env, cls, irn, live);
+	}
+
+	return live;
+}
diff --git a/ir/be/belive.h b/ir/be/belive.h
index f1be34a2b..ff0deb751 100644
--- a/ir/be/belive.h
+++ b/ir/be/belive.h
@@ -8,6 +8,9 @@
 #define _BELIVE_H
 
 #include "firm_types.h"
+#include "pset.h"
+#include "bearch_t.h"
+
 #include <stdio.h>
 
 /**
@@ -60,4 +63,37 @@ int (is_live_end)(const ir_node *block, const ir_node *irn);
  */
 void be_check_dominance(ir_graph *irg);
 
+/**
+ * The liveness transfer function.
+ * Updates a live set over a single step from a given node to its predecessor.
+ * Everything defined at the node is removed from the set, the uses of the node get inserted.
+ * @param arch_env The architecture environment.
+ * @param cls      The register class to consider.
+ * @param irn      The node at which liveness should be computed.
+ * @param live     The set of nodes live before @p irn. This set gets modified by updating it to
+ *                 the nodes live after irn.
+ * @return live.
+ */
+pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live);
+
+/**
+ * Put all node live at the end of a block into a set.
+ * @param arch_env The architecture environment.
+ * @param cls      The register class to consider.
+ * @param bl       The block.
+ * @param live     The set to put them into.
+ * @return live.
+ */
+pset *be_liveness_end_of_block(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live);
+
+/**
+ * Compute a set of nodes which are live at another node.
+ * @param arch_env The architecture environment.
+ * @param cls      The register class to consider.
+ * @param pos      The node.
+ * @param live     The set to put them into.
+ * @return live.
+ */
+pset *be_liveness_nodes_live_at(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live);
+
 #endif /* _BELIVE_H */
-- 
2.20.1