X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbelive.c;h=a2e400ee6ae787bd775abed71355cbf25b3000f7;hb=0cf1285126c03f408d0e6567547ce98864fd6e30;hp=758135464fb1fee3c02a0e988938337d50b7d3cb;hpb=e88a08a70637a48a20e50ab24d03ddf35e7ac189;p=libfirm

diff --git a/ir/be/belive.c b/ir/be/belive.c
index 758135464..a2e400ee6 100644
--- a/ir/be/belive.c
+++ b/ir/be/belive.c
@@ -1,7 +1,28 @@
+/*
+ * 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.
+ */
+
 /**
- * Interblock liveness analysis.
- * @author Sebastian Hack
- * @date 6.12.2004
+ * @file
+ * @brief       Interblock liveness analysis.
+ * @author      Sebastian Hack
+ * @date        06.12.2004
+ * @version     $Id$
  */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
@@ -12,47 +33,299 @@
 #include "irgwalk.h"
 #include "irprintf_t.h"
 #include "irbitset.h"
+#include "irdump_t.h"
+#include "irnodeset.h"
+
+#include "dfs_t.h"
+#include "absgraph.h"
+#include "statev.h"
 
 #include "beutil.h"
 #include "belive_t.h"
+#include "beirg_t.h"
 #include "besched_t.h"
+#include "bemodule.h"
+
+DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
 
-#define DBG_MODULE "firm.be.liveness"
+/* see comment in compute_liveness() */
+#define LV_COMPUTE_SORTED
+#define LV_STD_SIZE             64
+#define LV_USE_BINARY_SEARCH
+#undef  LV_INTESIVE_CHECKS
 
-FIRM_IMPL2(is_live_in, int, const ir_node *, const ir_node *)
-FIRM_IMPL2(is_live_out, int, const ir_node *, const ir_node *)
-FIRM_IMPL2(is_live_end, int, const ir_node *, const ir_node *)
+void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc);
 
-/** The offset of the liveness information in a firm node. */
-size_t live_irg_data_offset = 0;
+static INLINE int is_liveness_node(const ir_node *irn)
+{
+	switch(get_irn_opcode(irn)) {
+	case iro_Block:
+	case iro_Bad:
+	case iro_End:
+	case iro_Anchor:
+	case iro_NoMem:
+		return 0;
+	default:;
+	}
+
+	return 1;
+}
 
-void be_liveness_init(void)
+int (be_lv_next_irn)(const struct _be_lv_t *lv, const ir_node *bl, unsigned flags, int i)
 {
-  live_irg_data_offset = register_additional_graph_data(sizeof(irn_live_t));
+	return _be_lv_next_irn(lv, bl, flags, i);
+}
+
+const ir_node * (be_lv_get_irn)(const struct _be_lv_t *lv, const ir_node *bl, int i)
+{
+	return _be_lv_get_irn(lv, bl, i);
+}
+
+int (be_is_live_in)(const be_lv_t *lv, const ir_node *block, const ir_node *irn)
+{
+	return _be_is_live_xxx(lv, block, irn, be_lv_state_in);
+}
+
+int (be_is_live_out)(const be_lv_t *lv, const ir_node *block, const ir_node *irn)
+{
+	return _be_is_live_xxx(lv, block, irn, be_lv_state_out);
+}
+
+int (be_is_live_end)(const be_lv_t *lv, const ir_node *block, const ir_node *irn)
+{
+	return _be_is_live_xxx(lv, block, irn, be_lv_state_end);
+}
+
+
+#ifdef LV_USE_BINARY_SEARCH
+static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx)
+{
+	struct _be_lv_info_t *payload = arr + 1;
+
+	unsigned n   = arr[0].u.head.n_members;
+	unsigned res = 0;
+	int lo       = 0;
+	int hi       = n;
+
+	if(n == 0)
+		return 0;
+
+	while(lo < hi) {
+		int md          = lo + ((hi - lo) >> 1);
+		unsigned md_idx = payload[md].u.node.idx;
+
+		if(idx > md_idx)
+			lo = md + 1;
+		else if(idx < md_idx)
+			hi = md;
+		else {
+			res = md;
+			assert(payload[res].u.node.idx == idx);
+			break;
+		}
+
+		res = lo;
+	}
+
+#ifdef LV_INTESIVE_CHECKS
+	{
+		unsigned i;
+		for(i = res; i < n; ++i)
+			assert(payload[i].u.node.idx >= idx);
+
+		for(i = 0; i < res; ++i)
+			assert(payload[i].u.node.idx < idx);
+	}
+#endif
+
+	return res;
+}
+
+#else
+
+/**
+ * This function searches linearly for the node in the array.
+ */
+static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned idx) {
+	unsigned n  = arr[0].u.head.n_members;
+	unsigned i;
+
+	for(i = 0; i < n; ++i) {
+		if(arr[i + 1].u.node.idx == idx)
+			return i;
+	}
+
+	return i;
+}
+#endif
+
+struct _be_lv_info_node_t *be_lv_get(const struct _be_lv_t *li, const ir_node *bl, const ir_node *irn)
+{
+	struct _be_lv_info_t *irn_live;
+	struct _be_lv_info_node_t *res = NULL;
+
+	stat_ev_tim_push();
+	irn_live = phase_get_irn_data(&li->ph, bl);
+	if(irn_live) {
+		unsigned idx = get_irn_idx(irn);
+
+		/* Get the position of the index in the array. */
+		int pos = _be_liveness_bsearch(irn_live, idx);
+
+		/* Get the record in question. 1 must be added, since the first record contains information about the array and must be skipped. */
+		struct _be_lv_info_node_t *rec = &irn_live[pos + 1].u.node;
+
+		/* Check, if the irn is in deed in the array. */
+		if(rec->idx == idx)
+			res = rec;
+	}
+	stat_ev_tim_pop("be_lv_get");
+
+	return res;
+}
+
+static struct _be_lv_info_node_t *be_lv_get_or_set(struct _be_lv_t *li, ir_node *bl, ir_node *irn)
+{
+	struct _be_lv_info_t *irn_live = phase_get_or_set_irn_data(&li->ph, bl);
+
+	unsigned idx = get_irn_idx(irn);
+
+	/* Get the position of the index in the array. */
+	unsigned pos = _be_liveness_bsearch(irn_live, idx);
+
+	/* Get the record in question. 1 must be added, since the first record contains information about the array and must be skipped. */
+	struct _be_lv_info_node_t *res = &irn_live[pos + 1].u.node;
+
+	/* Check, if the irn is in deed in the array. */
+	if(res->idx != idx) {
+		struct _be_lv_info_t *payload;
+		unsigned n_members = irn_live[0].u.head.n_members;
+		unsigned n_size    = irn_live[0].u.head.n_size;
+		unsigned i;
+
+		if(n_members + 1 >= n_size) {
+			/* double the array size. Remember that the first entry is
+			 * metadata about the array and not a real array element */
+			unsigned old_size_bytes  = (n_size + 1) * sizeof(irn_live[0]);
+			unsigned new_size        = (2 * n_size) + 1;
+			size_t   new_size_bytes  = new_size * sizeof(irn_live[0]);
+			struct _be_lv_info_t *nw = phase_alloc(&li->ph, new_size_bytes);
+			memcpy(nw, irn_live, old_size_bytes);
+			memset(((char*) nw) + old_size_bytes, 0,
+			       new_size_bytes - old_size_bytes);
+			nw[0].u.head.n_size = new_size - 1;
+			irn_live = nw;
+			phase_set_irn_data(&li->ph, bl, nw);
+		}
+
+		payload = &irn_live[1];
+		for(i = n_members; i > pos; --i) {
+			payload[i] = payload[i - 1];
+		}
+
+		++irn_live[0].u.head.n_members;
+
+		res = &payload[pos].u.node;
+		res->idx    = idx;
+		res->flags  = 0;
+	}
+
+#ifdef LV_INTESIVE_CHECKS
+	{
+		unsigned i;
+		unsigned n = irn_live[0].u.head.n_members;
+		unsigned last = 0;
+		struct _be_lv_info_t *payload = &irn_live[1];
+
+		for(i = 0; i < n; ++i) {
+			assert(payload[i].u.node.idx >= last);
+			last = payload[i].u.node.idx;
+		}
+	}
+#endif
+
+	return res;
+}
+
+/**
+ * Removes a node from the list of live variables of a block.
+ * @return 1 if the node was live at that block, 0 if not.
+ */
+static int be_lv_remove(struct _be_lv_t *li, const ir_node *bl,
+                        const ir_node *irn)
+{
+	struct _be_lv_info_t *irn_live = phase_get_irn_data(&li->ph, bl);
+
+	if(irn_live) {
+		unsigned n   = irn_live[0].u.head.n_members;
+		unsigned idx = get_irn_idx(irn);
+		unsigned pos = _be_liveness_bsearch(irn_live, idx);
+		struct _be_lv_info_t *payload  = irn_live + 1;
+		struct _be_lv_info_node_t *res = &payload[pos].u.node;
+
+		/* The node is in deed in the block's array. Let's remove it. */
+		if(res->idx == idx) {
+			unsigned i;
+
+			for(i = pos + 1; i < n; ++i)
+				payload[i - 1] = payload[i];
+
+			payload[n - 1].u.node.idx   = 0;
+			payload[n - 1].u.node.flags = 0;
+
+			--irn_live[0].u.head.n_members;
+			DBG((dbg, LEVEL_3, "\tdeleting %+F from %+F at pos %d\n", irn, bl, pos));
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static void register_node(be_lv_t *lv, const ir_node *irn)
+{
+	unsigned idx = get_irn_idx(irn);
+	if(idx >= bitset_size(lv->nodes)) {
+		bitset_t *nw = bitset_malloc(2 * idx);
+		bitset_copy(nw, lv->nodes);
+		bitset_free(lv->nodes);
+		lv->nodes = nw;
+	}
+
+	bitset_set(lv->nodes, idx);
 }
 
 /**
  * Mark a node as live-in in a block.
  */
-static INLINE void mark_live_in(ir_node *block, const ir_node *irn)
+static INLINE void mark_live_in(be_lv_t *lv, ir_node *block, ir_node *irn)
 {
-  _get_or_set_live(block, irn, live_state_in);
+	struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
+	DBG((dbg, LEVEL_2, "marking %+F live in at %+F\n", irn, block));
+	n->flags |= be_lv_state_in;
+	register_node(lv, irn);
 }
 
 /**
  * Mark a node as live-out in a block.
  */
-static INLINE void mark_live_out(ir_node *block, const ir_node *irn)
+static INLINE void mark_live_out(be_lv_t *lv, ir_node *block, ir_node *irn)
 {
-  _get_or_set_live(block, irn, live_state_out | live_state_end);
+	struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
+	DBG((dbg, LEVEL_2, "marking %+F live out at %+F\n", irn, block));
+	n->flags |= be_lv_state_out | be_lv_state_end;
+	register_node(lv, irn);
 }
 
 /**
  * Mark a node as live-end in a block.
  */
-static INLINE void mark_live_end(ir_node *block, const ir_node *irn)
+static INLINE void mark_live_end(be_lv_t *lv, ir_node *block, ir_node *irn)
 {
-  _get_or_set_live(block, irn, live_state_end);
+	struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn);
+	DBG((dbg, LEVEL_2, "marking %+F live end at %+F\n", irn, block));
+	n->flags |= be_lv_state_end;
+	register_node(lv, irn);
 }
 
 /**
@@ -65,11 +338,11 @@ static INLINE void mark_live_end(ir_node *block, const ir_node *irn)
  * @param is_true_out Is the node real out there or only live at the end
  * of the block.
  */
-static void live_end_at_block(ir_node *def, ir_node *block, bitset_t *visited, int is_true_out)
+static void live_end_at_block(be_lv_t *lv, ir_node *def, ir_node *block, bitset_t *visited, int is_true_out)
 {
-	mark_live_end(block, def);
+	mark_live_end(lv, block, def);
 	if(is_true_out)
-		mark_live_out(block, def);
+		mark_live_out(lv, block, def);
 
 	if(!bitset_contains_irn(visited, block)) {
 		bitset_add_irn(visited, block);
@@ -81,15 +354,26 @@ static void live_end_at_block(ir_node *def, ir_node *block, bitset_t *visited, i
 		if(get_nodes_block(def) != block) {
 			int i, n;
 
-			mark_live_in(block, def);
+			mark_live_in(lv, block, def);
 
 			for(i = 0, n = get_Block_n_cfgpreds(block); i < n; ++i)
-				live_end_at_block(def, get_Block_cfgpred_block(block, i), visited, 1);
+				live_end_at_block(lv, def, get_Block_cfgpred_block(block, i), visited, 1);
 		}
 
 	}
 }
 
+struct _lv_walker_t {
+	be_lv_t *lv;
+	void *data;
+};
+
+typedef struct lv_remove_walker_t {
+	be_lv_t       *lv;
+	const ir_node *irn;
+} lv_remove_walker_t;
+
+
 /**
  * Liveness analysis for a value.
  * This functions is meant to be called by a firm walker, to compute the
@@ -99,12 +383,14 @@ static void live_end_at_block(ir_node *def, ir_node *block, bitset_t *visited, i
  */
 static void liveness_for_node(ir_node *irn, void *data)
 {
-	bitset_t *visited = data;
+	struct _lv_walker_t *walker = data;
+	be_lv_t *lv       = walker->lv;
+	bitset_t *visited = walker->data;
 	const ir_edge_t *edge;
 	ir_node *def_block;
 
 	/* Don't compute liveness information for non-data nodes. */
-	if(!is_data_node(irn))
+	if(!is_liveness_node(irn))
 		return;
 
 	bitset_clear_all(visited);
@@ -115,150 +401,344 @@ static void liveness_for_node(ir_node *irn, void *data)
 		ir_node *use = edge->src;
 		ir_node *use_block;
 
+		DBG((dbg, LEVEL_4, "%+F: use at %+F, pos %d in %+F\n", irn, use, edge->pos, get_block(use)));
+		assert(get_irn_n(use, edge->pos) == irn);
+
 		/*
-		* If the usage is no data node, skip this use, since it does not
-		* affect the liveness of the node.
-		*/
-		if(!is_data_node(use))
+		 * If the usage is no data node, skip this use, since it does not
+		 * affect the liveness of the node.
+		 */
+		if(!is_liveness_node(use))
 			continue;
 
 		/* Get the block where the usage is in. */
 		use_block = get_nodes_block(use);
 
 		/*
-		* If the use is a phi function, determine the corresponding block
-		* through which the value reaches the phi function and mark the
-		* value as live out of that block.
-		*/
+		 * If the use is a phi function, determine the corresponding block
+		 * through which the value reaches the phi function and mark the
+		 * value as live out of that block.
+		 */
 		if(is_Phi(use)) {
 			ir_node *pred_block = get_Block_cfgpred_block(use_block, edge->pos);
-			live_end_at_block(irn, pred_block, visited, 0);
+			live_end_at_block(lv, irn, pred_block, visited, 0);
 		}
 
 		/*
-		* Else, the value is live in at this block. Mark it and call live
-		* out on the predecessors.
-		*/
+		 * Else, the value is live in at this block. Mark it and call live
+		 * out on the predecessors.
+		 */
 		else if(def_block != use_block) {
 			int i, n;
 
-			mark_live_in(use_block, irn);
+			mark_live_in(lv, use_block, irn);
 
 			for(i = 0, n = get_Block_n_cfgpreds(use_block); i < n; ++i) {
 				ir_node *pred_block = get_Block_cfgpred_block(use_block, i);
-				live_end_at_block(irn, pred_block, visited, 1);
+				live_end_at_block(lv, irn, pred_block, visited, 1);
 			}
 		}
 	}
 }
 
-/**
- * Compare two live entries.
- */
-static int cmp_irn_live(const void *a, const void *b, size_t size)
-{
-  const irn_live_t *p = a;
-  const irn_live_t *q = b;
-
-  return !(p->block == q->block && p->irn == q->irn);
-}
-
-static int (*old_dump_block_func)(ir_node *self, FILE *F, dump_reason_t reason) = NULL;
-
-static int dump_block_func(ir_node *self, FILE *F, dump_reason_t reason)
-{
-	switch(reason) {
-	case dump_node_opcode_txt:
-		fprintf(F, get_irn_opname(self));
-		break;
-	case dump_node_mode_txt:
-		fprintf(F, get_irn_modename(self));
-		break;
-	case dump_node_nodeattr_txt:
-		break;
-	case dump_node_info_txt:
-		if(!get_irg_live_info(get_irn_irg(self))->live)
-			return 0;
-#if 0
-		fprintf(F, "liveness information:\n");
-		{
-			irn_live_t *li;
-			live_foreach(self, li) {
-				ir_fprintf(F, "%+F", li->irn);
-				if(live_is_in(li))
-					fprintf(F, " in");
-				if(live_is_end(li))
-					fprintf(F, " end");
-				if(live_is_out(li))
-					fprintf(F, " out");
-
-				fprintf(F, "\n");
+static void lv_remove_irn_walker(ir_node *bl, void *data)
+{
+	lv_remove_walker_t *w = data;
+	be_lv_remove(w->lv, bl, w->irn);
+}
+
+static const char *lv_flags_to_str(unsigned flags)
+{
+	static const char *states[] = {
+		"---",
+		"i--",
+		"-e-",
+		"ie-",
+		"--o",
+		"i-o",
+		"-eo",
+		"ieo"
+	};
+
+	return states[flags & 7];
+}
+
+static void lv_dump_block(void *context, FILE *f, const ir_node *bl)
+{
+	if(is_Block(bl)) {
+		be_lv_t *lv = context;
+		struct _be_lv_info_t *info = phase_get_irn_data(&lv->ph, bl);
+
+		fprintf(f, "liveness:\n");
+		if(info) {
+			unsigned n = info[0].u.head.n_members;
+			unsigned i;
+
+			for(i = 0; i < n; ++i) {
+				struct _be_lv_info_node_t *n = &info[i+1].u.node;
+				ir_fprintf(f, "%s %+F\n", lv_flags_to_str(n->flags), get_idx_irn(lv->irg, n->idx));
 			}
 		}
+	}
+}
+
+static void *lv_phase_data_init(ir_phase *phase, const ir_node *irn, void *old)
+{
+	struct _be_lv_info_t *info = phase_alloc(phase, LV_STD_SIZE * sizeof(info[0]));
+	(void) irn;
+	(void) old;
+
+	memset(info, 0, LV_STD_SIZE * sizeof(info[0]));
+	info[0].u.head.n_size = LV_STD_SIZE - 1;
+	return info;
+}
+
+static void collect_nodes(ir_node *irn, void *data)
+{
+	struct obstack *obst = data;
+	if (is_liveness_node(irn))
+		obstack_ptr_grow(obst, irn);
+}
+
+static int node_idx_cmp(const void *a, const void *b)
+{
+	const ir_node *p = *(ir_node **) a;
+	const ir_node *q = *(ir_node **) b;
+	int ia = get_irn_idx(p);
+	int ib = get_irn_idx(q);
+	return ia - ib;
+}
+
+static void compute_liveness(be_lv_t *lv)
+{
+	struct obstack obst;
+	struct _lv_walker_t w;
+	ir_node **nodes;
+	int i, n;
+
+	stat_ev_tim_push();
+	obstack_init(&obst);
+	irg_walk_graph(lv->irg, collect_nodes, NULL, &obst);
+	n      = obstack_object_size(&obst) / sizeof(nodes[0]);
+	nodes  = obstack_finish(&obst);
+
+	/*
+	 * inserting the variables sorted by their ID is probably
+	 * more efficient since the binary sorted set insertion
+	 * will not need to move arounf the data.
+	 * However, if sorting the variables a priori pays off
+	 * needs to be checked, hence the define.
+	 */
+#ifdef LV_COMPUTE_SORTED
+	qsort(nodes, n, sizeof(nodes[0]), node_idx_cmp);
 #endif
+
+	w.lv   = lv;
+	w.data = bitset_obstack_alloc(&obst, get_irg_last_idx(lv->irg));
+
+	for (i = 0; i < n; ++i)
+		liveness_for_node(nodes[i], &w);
+
+	obstack_free(&obst, NULL);
+	register_hook(hook_node_info, &lv->hook_info);
+	stat_ev_tim_pop("be_lv_sets_cons");
+}
+
+void be_liveness_assure_sets(be_lv_t *lv)
+{
+	if (!lv->nodes) {
+		BE_TIMER_PUSH(t_live);
+
+		lv->nodes = bitset_malloc(2 * get_irg_last_idx(lv->irg));
+		phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init, NULL);
+		compute_liveness(lv);
+		/* be_live_chk_compare(lv, lv->lvc); */
+
+		BE_TIMER_POP(t_live);
 	}
+}
 
-	return 0;
+void be_liveness_assure_chk(be_lv_t *lv)
+{
+#ifndef USE_LIVE_CHK
+	BE_TIMER_PUSH(t_verify);
+	be_liveness_assure_sets(lv);
+	BE_TIMER_POP(t_verify);
+#else
+	(void) lv;
+#endif
+}
+
+void be_liveness_invalidate(be_lv_t *lv)
+{
+	if (lv && lv->nodes) {
+		unregister_hook(hook_node_info, &lv->hook_info);
+		phase_free(&lv->ph);
+		bitset_free(lv->nodes);
+		lv->nodes = NULL;
+	}
 }
 
 /* Compute the inter block liveness for a graph. */
-void be_liveness(ir_graph *irg)
+be_lv_t *be_liveness(const be_irg_t *birg)
 {
-	bitset_t *visited = bitset_irg_malloc(irg);
+	be_lv_t *lv = xmalloc(sizeof(lv[0]));
+
+	memset(lv, 0, sizeof(lv[0]));
+	lv->irg  = be_get_birg_irg(birg);
+	lv->birg = birg;
+#ifdef USE_LIVE_CHK
+	lv->dfs  = dfs_new(&absgraph_irg_cfg_succ, lv->irg);
+	lv->lvc  = lv_chk_new(lv->irg, lv->dfs);
+#endif
+	lv->hook_info.context = lv;
+	lv->hook_info.hook._hook_node_info = lv_dump_block;
+
+	return lv;
+}
 
-	irg_live_info_t *live_info = get_irg_live_info(irg);
-	if(live_info->live)
-		del_set(live_info->live);
+void be_liveness_recompute(be_lv_t *lv)
+{
+	unsigned last_idx;
 
-	live_info->live = new_set(cmp_irn_live, 8192);
-	irg_walk_graph(irg, liveness_for_node, NULL, visited);
+	BE_TIMER_PUSH(t_live);
+	last_idx = get_irg_last_idx(lv->irg);
+	if(last_idx >= bitset_size(lv->nodes)) {
+		bitset_free(lv->nodes);
+		lv->nodes = bitset_malloc(last_idx * 2);
+	} else
+		bitset_clear_all(lv->nodes);
 
-	old_dump_block_func     = op_Block->ops.dump_node;
-	op_Block->ops.dump_node = dump_block_func;
+	phase_free(&lv->ph);
+	phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init, NULL);
+	compute_liveness(lv);
 
-	bitset_free(visited);
+	BE_TIMER_POP(t_live);
 }
 
-/**
- * Pre-walker: dump liveness data to a file
- */
-static void dump_liveness_walker(ir_node *bl, void *data)
+
+void be_liveness_free(be_lv_t *lv)
+{
+	be_liveness_invalidate(lv);
+	free(lv);
+}
+
+void be_liveness_remove(be_lv_t *lv, const ir_node *irn)
 {
-	FILE *f = data;
-	const irn_live_t *li;
-	char buf[64];
+	if (lv->nodes) {
+		unsigned idx = get_irn_idx(irn);
+		lv_remove_walker_t w;
 
-	ir_fprintf(f, "%+F\n", bl);
-	live_foreach(bl, li) {
-		strcpy(buf, "");
+		/*
+		 * Removes a single irn from the liveness information.
+		 * Since an irn can only be live at blocks dominated by the block of its
+		 * definition, we only have to process that dominance subtree.
+		 */
+		w.lv  = lv;
+		w.irn = irn;
+		dom_tree_walk(get_nodes_block(irn), lv_remove_irn_walker, NULL, &w);
+		if(idx < bitset_size(lv->nodes))
+			bitset_clear(lv->nodes, idx);
+	}
+}
 
-		if(live_is_in(li))
-			strcat(buf, "in ");
+void be_liveness_introduce(be_lv_t *lv, ir_node *irn)
+{
+	if (lv->nodes) {
+		struct _lv_walker_t w;
+		w.lv   = lv;
+		w.data = bitset_malloc(get_irg_last_idx(lv->irg));
+		liveness_for_node(irn, &w);
+		bitset_free(w.data);
+	}
+}
 
-		if(live_is_end(li))
-			strcat(buf, "end ");
+void be_liveness_update(be_lv_t *lv, ir_node *irn)
+{
+	be_liveness_remove(lv, irn);
+	be_liveness_introduce(lv, irn);
+}
+
+static void lv_check_walker(ir_node *bl, void *data)
+{
+	struct _lv_walker_t *w = data;
+	be_lv_t *lv    = w->lv;
+	be_lv_t *fresh = w->data;
 
-		if(live_is_out(li))
-			strcat(buf, "out ");
+	struct _be_lv_info_t *curr = phase_get_irn_data(&lv->ph, bl);
+	struct _be_lv_info_t *fr   = phase_get_irn_data(&fresh->ph, bl);
 
-		ir_fprintf(f, "\t%+20F %s\n", li->irn, buf);
+	if(!fr && curr && curr[0].u.head.n_members > 0) {
+		unsigned i;
+
+		ir_fprintf(stderr, "%+F liveness should be empty but current liveness contains:\n", bl);
+		for(i = 0; i < curr[0].u.head.n_members; ++i) {
+			ir_fprintf(stderr, "\t%+F\n", get_idx_irn(lv->irg, curr[1 + i].u.node.idx));
+		}
+	}
+
+	else if(curr) {
+		unsigned n_curr  = curr[0].u.head.n_members;
+		unsigned n_fresh = fr[0].u.head.n_members;
+
+		unsigned i;
+
+		if(n_curr != n_fresh) {
+			ir_fprintf(stderr, "%+F: liveness set sizes differ. curr %d, correct %d\n", bl, n_curr, n_fresh);
+
+			ir_fprintf(stderr, "current:\n");
+			for(i = 0; i < n_curr; ++i) {
+				struct _be_lv_info_node_t *n = &curr[1 + i].u.node;
+				ir_fprintf(stderr, "%+F %u %+F %s\n", bl, i, get_idx_irn(lv->irg, n->idx), lv_flags_to_str(n->flags));
+			}
+
+			ir_fprintf(stderr, "correct:\n");
+			for(i = 0; i < n_fresh; ++i) {
+				struct _be_lv_info_node_t *n = &fr[1 + i].u.node;
+				ir_fprintf(stderr, "%+F %u %+F %s\n", bl, i, get_idx_irn(lv->irg, n->idx), lv_flags_to_str(n->flags));
+			}
+		}
 	}
 }
 
+void be_liveness_check(be_lv_t *lv)
+{
+	struct _lv_walker_t w;
+	be_lv_t *fresh = be_liveness(lv->birg);
+
+	w.lv   = lv;
+	w.data = fresh;
+	irg_block_walk_graph(lv->irg, lv_check_walker, NULL, &w);
+	be_liveness_free(fresh);
+}
+
+
+static void lv_dump_block_walker(ir_node *irn, void *data)
+{
+	struct _lv_walker_t *w = data;
+	if(is_Block(irn))
+		lv_dump_block(w->lv, w->data, irn);
+}
+
+
 /* Dump the liveness information for a graph. */
-void be_liveness_dump(ir_graph *irg, FILE *f)
+void be_liveness_dump(const be_lv_t *lv, FILE *f)
 {
-	irg_block_walk_graph(irg, dump_liveness_walker, NULL, f);
+	struct _lv_walker_t w;
+
+	w.lv   = (be_lv_t *) lv;
+	w.data = f;
+	irg_block_walk_graph(lv->irg, lv_dump_block_walker, NULL, &w);
 }
 
 /* Dump the liveness information for a graph. */
-void be_liveness_dumpto(ir_graph *irg, const char *cls_name)
+void be_liveness_dumpto(const be_lv_t *lv, const char *cls_name)
 {
 	FILE *f;
 	char buf[128];
-	ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", irg, cls_name);
+	ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", lv->irg, cls_name);
 	if((f = fopen(buf, "wt")) != NULL) {
-		be_liveness_dump(irg, f);
+		be_liveness_dump(lv, f);
 		fclose(f);
 	}
 }
@@ -269,6 +749,8 @@ void be_liveness_dumpto(ir_graph *irg, const char *cls_name)
  */
 static void dom_check(ir_node *irn, void *data)
 {
+	int *problem_found = data;
+
 	if(!is_Block(irn) && irn != get_irg_end(get_irn_irg(irn))) {
 		int i, n;
 		ir_node *bl = get_nodes_block(irn);
@@ -281,76 +763,178 @@ static void dom_check(ir_node *irn, void *data)
 			if(is_Phi(irn))
 				use_bl = get_Block_cfgpred_block(bl, i);
 
-			if(!block_dominates(def_bl, use_bl)) {
-				ir_fprintf(stderr, "%+F in %+F must dominate %+F for user %+F\n", op, def_bl, use_bl, irn);
-				assert(0);
+			if(get_irn_opcode(use_bl) != iro_Bad
+			     && get_irn_opcode(def_bl) != iro_Bad
+			     && !block_dominates(def_bl, use_bl)) {
+				ir_fprintf(stderr, "Verify warning: %+F in %+F must dominate %+F for user %+F (%s)\n", op, def_bl, use_bl, irn, get_irg_dump_name(get_irn_irg(op)));
+				*problem_found = 1;
 			}
 		}
 	}
 }
 
 /* Check, if the SSA dominance property is fulfilled. */
-void be_check_dominance(ir_graph *irg)
+int be_check_dominance(ir_graph *irg)
 {
-	irg_walk_graph(irg, dom_check, NULL, NULL);
+	int problem_found = 0;
+
+	assure_doms(irg);
+	irg_walk_graph(irg, dom_check, NULL, &problem_found);
+
+	return !problem_found;
 }
 
-pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live)
+void be_liveness_transfer(const arch_env_t *arch_env,
+                          const arch_register_class_t *cls,
+                          ir_node *node, ir_nodeset_t *nodeset)
 {
-	int i, n;
-	ir_node *x;
-	FIRM_DBG_REGISTER(firm_dbg_module_t *dbg, DBG_MODULE);
-
-	DEBUG_ONLY(
-		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)) {
-		ir_node *del = pset_remove_ptr(live, irn);
-		assert(irn == del);
-	}
+	int i, arity;
+
+	/* You should better break out of your loop when hitting the first phi
+	 * function. */
+	assert(!is_Phi(node) && "liveness_transfer produces invalid results for phi nodes");
+
+	if (get_irn_mode(node) == mode_T) {
+		const ir_edge_t *edge;
+
+		foreach_out_edge(node, edge) {
+			ir_node *proj = get_edge_src_irn(edge);
 
-	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, proj)) {
+				ir_nodeset_remove(nodeset, proj);
+			}
+		}
+	}
 
-		if(arch_irn_consider_in_reg_alloc(arch_env, cls, op))
-			pset_insert_ptr(live, op);
+	if (arch_irn_consider_in_reg_alloc(arch_env, cls, node)) {
+		ir_nodeset_remove(nodeset, node);
 	}
 
-	return live;
+	arity = get_irn_arity(node);
+	for (i = 0; i < arity; ++i) {
+		ir_node *op = get_irn_n(node, i);
+
+		if (arch_irn_consider_in_reg_alloc(arch_env, cls, op))
+			ir_nodeset_insert(nodeset, op);
+	}
 }
 
-pset *be_liveness_end_of_block(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live)
+
+
+void be_liveness_end_of_block(const be_lv_t *lv, const arch_env_t *arch_env,
+                              const arch_register_class_t *cls,
+                              const ir_node *block, ir_nodeset_t *live)
 {
-	irn_live_t *li;
+	int i;
 
-	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);
-	}
+	assert(lv->nodes && "live sets must be computed");
+	be_lv_foreach(lv, block, be_lv_state_end, i) {
+		ir_node *node = be_lv_get_irn(lv, block, i);
+		if(!arch_irn_consider_in_reg_alloc(arch_env, cls, node))
+			continue;
 
-	return live;
+		ir_nodeset_insert(live, node);
+	}
 }
 
-pset *be_liveness_nodes_live_at(const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live)
+
+
+void be_liveness_nodes_live_at(const be_lv_t *lv, const arch_env_t *arch_env,
+                               const arch_register_class_t *cls,
+                               const ir_node *pos, ir_nodeset_t *live)
 {
 	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);
+	be_liveness_end_of_block(lv, 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;
+			return;
 
 		be_liveness_transfer(arch_env, cls, irn, live);
 	}
+}
+
+void be_liveness_nodes_live_at_input(const be_lv_t *lv,
+                                     const arch_env_t *arch_env,
+                                     const arch_register_class_t *cls,
+                                     const ir_node *pos, ir_nodeset_t *live)
+{
+	const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
+	ir_node *irn;
 
-	return live;
+	assert(lv->nodes && "live sets must be computed");
+	be_liveness_end_of_block(lv, arch_env, cls, bl, live);
+	sched_foreach_reverse(bl, irn) {
+		be_liveness_transfer(arch_env, cls, irn, live);
+		if(irn == pos)
+			return;
+	}
+}
+
+static void collect_node(ir_node *irn, void *data)
+{
+	struct obstack *obst = data;
+	obstack_ptr_grow(obst, irn);
+}
+
+void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc)
+{
+	ir_graph *irg    = lv->irg;
+
+	struct obstack obst;
+	ir_node **nodes;
+	ir_node **blocks;
+	int i, j;
+
+	obstack_init(&obst);
+
+	irg_block_walk_graph(irg, collect_node, NULL, &obst);
+	obstack_ptr_grow(&obst, NULL);
+	blocks = obstack_finish(&obst);
+
+	irg_walk_graph(irg, collect_node, NULL, &obst);
+	obstack_ptr_grow(&obst, NULL);
+	nodes = obstack_finish(&obst);
+
+	stat_ev_ctx_push("be_lv_chk_compare");
+	for (j = 0; nodes[j]; ++j) {
+		ir_node *irn = nodes[j];
+		for (i = 0; blocks[i]; ++i) {
+			ir_node *bl = blocks[i];
+
+			if (!is_Block(irn)) {
+				int lvr_in  = be_is_live_in (lv, bl, irn);
+				int lvr_out = be_is_live_out(lv, bl, irn);
+				int lvr_end = be_is_live_end(lv, bl, irn);
+
+				int lvc_in  = lv_chk_bl_in (lvc, bl, irn);
+				int lvc_out = lv_chk_bl_out(lvc, bl, irn);
+				int lvc_end = lv_chk_bl_end(lvc, bl, irn);
+
+				if (lvr_in - lvc_in != 0)
+					ir_fprintf(stderr, "live in  info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_in, lvc_in);
+
+				if (lvr_end - lvc_end != 0)
+					ir_fprintf(stderr, "live end info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_end, lvc_end);
+
+				if (lvr_out - lvc_out != 0)
+					ir_fprintf(stderr, "live out info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_out, lvc_out);
+			}
+		}
+	}
+	stat_ev_ctx_pop("be_lv_chk_compare");
+
+	obstack_free(&obst, NULL);
 }
+
+void be_init_live(void)
+{
+	FIRM_DBG_REGISTER(dbg, "firm.be.liveness");
+}
+
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_live);