X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbecopyheur4.c;h=dbe5acc87077f0ca241ae239f05d553e7bb8db3d;hb=945c6c2ceebef5e41c0486c31f49d2319cacb3da;hp=a5bd67233cdc4bca604e8623a2bf3732d1aa2fe4;hpb=5af4cb6fd26054ef16c8da79d534abacb2a32c6e;p=libfirm

diff --git a/ir/be/becopyheur4.c b/ir/be/becopyheur4.c
index a5bd67233..dbe5acc87 100644
--- a/ir/be/becopyheur4.c
+++ b/ir/be/becopyheur4.c
@@ -1,20 +1,6 @@
 /*
- * 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.
+ * Copyright (C) 2012 University of Karlsruhe.
  */
 
 /**
@@ -22,16 +8,15 @@
  * @brief       Simple copy minimization heuristics.
  * @author      Christian Wuerdig
  * @date        27.04.2007
- * @version     $Id$
  *
  * This is the C implementation of the mst algorithm
  * originally written in Java by Sebastian Hack.
  * (also known as "heur3" :)
  * Performs simple copy minimization.
  */
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif /* HAVE_CONFIG_H */
+
+#define DISABLE_STATEV
 
 #include <float.h>
 
@@ -39,18 +24,16 @@
 #include "irnode_t.h"
 #include "bitset.h"
 #include "raw_bitset.h"
-#include "irphase_t.h"
+#include "irnodemap.h"
 #include "pqueue.h"
 #include "xmalloc.h"
 #include "pdeq.h"
-#include "pset.h"
 #include "irprintf.h"
-#include "irbitset.h"
+#include "util.h"
+#include "irtools.h"
 #include "error.h"
 #include "list.h"
-#include "statev.h"
-
-#include "irbitset.h"
+#include "statev_t.h"
 
 #include "bearch.h"
 #include "beifg.h"
@@ -59,15 +42,10 @@
 #include "bemodule.h"
 
 
-#define COL_COST_INFEASIBLE       DBL_MAX
-#define AFF_NEIGHBOUR_FIX_BENEFIT 128.0
-#define NEIGHBOUR_CONSTR_COSTS    64.0
-
-
 #ifdef DEBUG_libfirm
 
-#define DBG_AFF_CHUNK(env, level, chunk) do { if (firm_dbg_get_mask(dbg) & (level)) dbg_aff_chunk((env), (chunk)); } while(0)
-#define DBG_COL_COST(env, level, cost)   do { if (firm_dbg_get_mask(dbg) & (level)) dbg_col_cost((env), (cost)); } while(0)
+#define DBG_AFF_CHUNK(env, level, chunk) do { if (firm_dbg_get_mask(dbg) & (level)) dbg_aff_chunk((env), (chunk)); } while (0)
+#define DBG_COL_COST(env, level, cost)   do { if (firm_dbg_get_mask(dbg) & (level)) dbg_col_cost((env), (cost)); } while (0)
 
 static firm_dbg_module_t *dbg = NULL;
 
@@ -81,11 +59,11 @@ static firm_dbg_module_t *dbg = NULL;
 typedef float real_t;
 #define REAL(C)   (C ## f)
 
-static int last_chunk_id        = 0;
-static int recolor_limit        = 4;
-static real_t dislike_influence = REAL(0.1);
+static unsigned last_chunk_id   = 0;
+static int recolor_limit        = 7;
+static double dislike_influence = REAL(0.1);
 
-typedef struct _col_cost_t {
+typedef struct col_cost_t {
 	int     col;
 	real_t  cost;
 } col_cost_t;
@@ -93,43 +71,43 @@ typedef struct _col_cost_t {
 /**
  * An affinity chunk.
  */
-typedef struct _aff_chunk_t {
-	const ir_node    **n;                   /**< An ARR_F containing all nodes of the chunk. */
-	const ir_node    **interfere;           /**< An ARR_F containing all inference. */
+typedef struct aff_chunk_t {
+	const ir_node  **n;                     /**< An ARR_F containing all nodes of the chunk. */
+	const ir_node  **interfere;             /**< An ARR_F containing all inference. */
 	int              weight;                /**< Weight of this chunk */
 	unsigned         weight_consistent : 1; /**< Set if the weight is consistent. */
 	unsigned         deleted           : 1; /**< For debugging: Set if the was deleted. */
-	int              id;                    /**< An id of this chunk. */
-	int              visited;
+	unsigned         id;                    /**< An id of this chunk. */
+	unsigned         visited;
+	list_head        list;
 	col_cost_t       color_affinity[1];
 } aff_chunk_t;
 
 /**
  * An affinity edge.
  */
-typedef struct _aff_edge_t {
+typedef struct aff_edge_t {
 	const ir_node *src;                   /**< Source node. */
 	const ir_node *tgt;                   /**< Target node. */
-	double  weight;                 /**< The weight of this edge. */
+	int           weight;                 /**< The weight of this edge. */
 } aff_edge_t;
 
 /* main coalescing environment */
-typedef struct _co_mst_env_t {
+typedef struct co_mst_env_t {
 	int              n_regs;         /**< number of regs in class */
-	int              k;              /**< number of non-ignore registers in class */
-	bitset_t         *ignore_regs;   /**< set containing all global ignore registers */
-	ir_phase         ph;             /**< phase object holding data for nodes */
-	pqueue           *chunks;        /**< priority queue for chunks */
-	pset             *chunkset;      /**< set holding all chunks */
+	bitset_t const   *allocatable_regs; /**< set containing all global ignore registers */
+	ir_nodemap        map;           /**< phase object holding data for nodes */
+	struct obstack    obst;
+	pqueue_t         *chunks;        /**< priority queue for chunks */
+	list_head         chunklist;     /**< list holding all chunks */
 	be_ifg_t         *ifg;           /**< the interference graph */
-	const arch_env_t *aenv;          /**< the arch environment */
 	copy_opt_t       *co;            /**< the copy opt object */
-	int               chunk_visited;
+	unsigned         chunk_visited;
 	col_cost_t      **single_cols;
 } co_mst_env_t;
 
 /* stores coalescing related information for a node */
-typedef struct _co_mst_irn_t {
+typedef struct co_mst_irn_t {
 	const ir_node    *irn;              /**< the irn this information belongs to */
 	aff_chunk_t      *chunk;            /**< the chunk this irn belongs to */
 	bitset_t         *adm_colors;       /**< set of admissible colors for this irn */
@@ -144,7 +122,70 @@ typedef struct _co_mst_irn_t {
 	real_t           constr_factor;
 } co_mst_irn_t;
 
-#define get_co_mst_irn(mst_env, irn) (phase_get_or_set_irn_data(&(mst_env)->ph, (irn)))
+/**
+ * In case there is no phase information for irn, initialize it.
+ */
+static co_mst_irn_t *co_mst_irn_init(co_mst_env_t *env, const ir_node *irn)
+{
+	co_mst_irn_t *res = OALLOC(&env->obst, co_mst_irn_t);
+
+	const arch_register_req_t *req;
+	neighbours_iter_t nodes_it;
+	unsigned len;
+
+	res->irn           = irn;
+	res->chunk         = NULL;
+	res->fixed         = 0;
+	res->tmp_col       = -1;
+	res->int_neighs    = NULL;
+	res->int_aff_neigh = 0;
+	res->col           = arch_get_irn_register(irn)->index;
+	res->init_col      = res->col;
+	INIT_LIST_HEAD(&res->list);
+
+	DB((dbg, LEVEL_4, "Creating phase info for %+F\n", irn));
+
+	/* set admissible registers */
+	res->adm_colors = bitset_obstack_alloc(&env->obst, env->n_regs);
+
+	/* Exclude colors not assignable to the irn */
+	req = arch_get_irn_register_req(irn);
+	if (arch_register_req_is(req, limited)) {
+		rbitset_copy_to_bitset(req->limited, res->adm_colors);
+		/* exclude global ignore registers as well */
+		bitset_and(res->adm_colors, env->allocatable_regs);
+	} else {
+		bitset_copy(res->adm_colors, env->allocatable_regs);
+	}
+
+	/* compute the constraint factor */
+	res->constr_factor = (real_t) (1 + env->n_regs - bitset_popcount(res->adm_colors)) / env->n_regs;
+
+	/* set the number of interfering affinity neighbours to -1, they are calculated later */
+	res->int_aff_neigh = -1;
+
+	/* build list of interfering neighbours */
+	len = 0;
+	be_ifg_foreach_neighbour(env->ifg, &nodes_it, irn, neigh) {
+		if (!arch_irn_is_ignore(neigh)) {
+			obstack_ptr_grow(&env->obst, neigh);
+			++len;
+		}
+	}
+	res->int_neighs = (ir_node**)obstack_finish(&env->obst);
+	res->n_neighs   = len;
+	return res;
+}
+
+static co_mst_irn_t *get_co_mst_irn(co_mst_env_t *env, const ir_node *node)
+{
+	co_mst_irn_t *res = ir_nodemap_get(co_mst_irn_t, &env->map, node);
+	if (res == NULL) {
+		res = co_mst_irn_init(env, node);
+		ir_nodemap_insert(&env->map, node, res);
+	}
+	return res;
+}
 
 typedef int decide_func_t(const co_mst_irn_t *node, int col);
 
@@ -153,10 +194,10 @@ typedef int decide_func_t(const co_mst_irn_t *node, int col);
 /**
  * Write a chunk to stderr for debugging.
  */
-static void dbg_aff_chunk(const co_mst_env_t *env, const aff_chunk_t *c) {
+static void dbg_aff_chunk(const co_mst_env_t *env, const aff_chunk_t *c)
+{
 	int i, l;
 	(void) env;
-
 	if (c->weight_consistent)
 		ir_fprintf(stderr, " $%d ", c->weight);
 	ir_fprintf(stderr, "{");
@@ -170,15 +211,15 @@ static void dbg_aff_chunk(const co_mst_env_t *env, const aff_chunk_t *c) {
 /**
  * Dump all admissible colors to stderr.
  */
-static void dbg_admissible_colors(const co_mst_env_t *env, const co_mst_irn_t *node) {
-	bitset_pos_t idx;
+static void dbg_admissible_colors(const co_mst_env_t *env, const co_mst_irn_t *node)
+{
 	(void) env;
 
-	if (bitset_popcnt(node->adm_colors) < 1)
+	if (bitset_popcount(node->adm_colors) < 1)
 		fprintf(stderr, "no admissible colors?!?");
 	else {
 		bitset_foreach(node->adm_colors, idx) {
-			fprintf(stderr, " %d", idx);
+			ir_fprintf(stderr, " %zu", idx);
 		}
 	}
 }
@@ -186,7 +227,8 @@ static void dbg_admissible_colors(const co_mst_env_t *env, const co_mst_irn_t *n
 /**
  * Dump color-cost pairs to stderr.
  */
-static void dbg_col_cost(const co_mst_env_t *env, const col_cost_t *cost) {
+static void dbg_col_cost(const co_mst_env_t *env, const col_cost_t *cost)
+{
 	int i;
 	for (i = 0; i < env->n_regs; ++i)
 		fprintf(stderr, " (%d, %.4f)", cost[i].col, cost[i].cost);
@@ -194,37 +236,42 @@ static void dbg_col_cost(const co_mst_env_t *env, const col_cost_t *cost) {
 
 #endif /* DEBUG_libfirm */
 
-static INLINE int get_mst_irn_col(const co_mst_irn_t *node) {
+static inline int get_mst_irn_col(const co_mst_irn_t *node)
+{
 	return node->tmp_col >= 0 ? node->tmp_col : node->col;
 }
 
 /**
  * @return 1 if node @p node has color @p col, 0 otherwise.
  */
-static int decider_has_color(const co_mst_irn_t *node, int col) {
+static int decider_has_color(const co_mst_irn_t *node, int col)
+{
 	return get_mst_irn_col(node) == col;
 }
 
 /**
  * @return 1 if node @p node has not color @p col, 0 otherwise.
  */
-static int decider_hasnot_color(const co_mst_irn_t *node, int col) {
+static int decider_hasnot_color(const co_mst_irn_t *node, int col)
+{
 	return get_mst_irn_col(node) != col;
 }
 
 /**
  * Always returns true.
  */
-static int decider_always_yes(const co_mst_irn_t *node, int col) {
+static int decider_always_yes(const co_mst_irn_t *node, int col)
+{
 	(void) node;
 	(void) col;
 	return 1;
 }
 
 /** compares two affinity edges by its weight */
-static int cmp_aff_edge(const void *a, const void *b) {
-	const aff_edge_t *e1 = a;
-	const aff_edge_t *e2 = b;
+static int cmp_aff_edge(const void *a, const void *b)
+{
+	const aff_edge_t *e1 = (const aff_edge_t*)a;
+	const aff_edge_t *e2 = (const aff_edge_t*)b;
 
 	if (e2->weight == e1->weight) {
 		if (e2->src->node_idx == e1->src->node_idx)
@@ -237,41 +284,57 @@ static int cmp_aff_edge(const void *a, const void *b) {
 }
 
 /** compares to color-cost pairs */
-static __attribute__((unused)) int cmp_col_cost_lt(const void *a, const void *b) {
-	const col_cost_t *c1 = a;
-	const col_cost_t *c2 = b;
+static __attribute__((unused)) int cmp_col_cost_lt(const void *a, const void *b)
+{
+	const col_cost_t *c1 = (const col_cost_t*)a;
+	const col_cost_t *c2 = (const col_cost_t*)b;
 	real_t diff = c1->cost - c2->cost;
-	return (diff > 0) - (diff < 0);
+
+	if (diff < 0)
+		return 1;
+	if (diff > 0)
+		return -1;
+
+	return QSORT_CMP(c1->col, c2->col);
 }
 
-static int cmp_col_cost_gt(const void *a, const void *b) {
-	const col_cost_t *c1 = a;
-	const col_cost_t *c2 = b;
+static int cmp_col_cost_gt(const void *a, const void *b)
+{
+	const col_cost_t *c1 = (const col_cost_t*)a;
+	const col_cost_t *c2 = (const col_cost_t*)b;
 	real_t diff = c2->cost - c1->cost;
-	return (diff > 0) - (diff < 0);
+
+	if (diff > 0)
+		return 1;
+	if (diff < 0)
+		return -1;
+
+	return QSORT_CMP(c1->col, c2->col);
 }
 
 /**
  * Creates a new affinity chunk
  */
-static INLINE aff_chunk_t *new_aff_chunk(co_mst_env_t *env) {
-	aff_chunk_t *c = xmalloc(sizeof(*c) + (env->n_regs - 1) * sizeof(c->color_affinity[0]));
+static inline aff_chunk_t *new_aff_chunk(co_mst_env_t *env)
+{
+	aff_chunk_t *c = XMALLOCF(aff_chunk_t, color_affinity, env->n_regs);
 	c->n                 = NEW_ARR_F(const ir_node *, 0);
-	c->interfere         = NEW_ARR_F(ir_node *, 0);
+	c->interfere         = NEW_ARR_F(const ir_node *, 0);
 	c->weight            = -1;
 	c->weight_consistent = 0;
 	c->deleted           = 0;
 	c->id                = ++last_chunk_id;
 	c->visited           = 0;
-	pset_insert(env->chunkset, c, c->id);
+	list_add(&c->list, &env->chunklist);
 	return c;
 }
 
 /**
  * Frees all memory allocated by an affinity chunk.
  */
-static INLINE void delete_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
-	pset_remove(env->chunkset, c, c->id);
+static inline void delete_aff_chunk(aff_chunk_t *c)
+{
+	list_del(&c->list);
 	DEL_ARR_F(c->interfere);
 	DEL_ARR_F(c->n);
 	c->deleted = 1;
@@ -284,7 +347,8 @@ static INLINE void delete_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
  * @return the position where n is found in the array arr or ~pos
  * if the nodes is not here.
  */
-static INLINE int nodes_bsearch(const ir_node **arr, const ir_node *n) {
+static inline int nodes_bsearch(const ir_node **arr, const ir_node *n)
+{
 	int hi = ARR_LEN(arr);
 	int lo = 0;
 
@@ -303,7 +367,8 @@ static INLINE int nodes_bsearch(const ir_node **arr, const ir_node *n) {
 }
 
 /** Check if a node n can be found inside arr. */
-static int node_contains(const ir_node **arr, const ir_node *n) {
+static int node_contains(const ir_node **arr, const ir_node *n)
+{
 	int i = nodes_bsearch(arr, n);
 	return i >= 0;
 }
@@ -313,7 +378,8 @@ static int node_contains(const ir_node **arr, const ir_node *n) {
  *
  * @return 1 if the node was inserted, 0 else
  */
-static int nodes_insert(const ir_node ***arr, const ir_node *irn) {
+static int nodes_insert(const ir_node ***arr, const ir_node *irn)
+{
 	int idx = nodes_bsearch(*arr, irn);
 
 	if (idx < 0) {
@@ -336,7 +402,8 @@ static int nodes_insert(const ir_node ***arr, const ir_node *irn) {
 /**
  * Adds a node to an affinity chunk
  */
-static INLINE void aff_chunk_add_node(aff_chunk_t *c, co_mst_irn_t *node) {
+static inline void aff_chunk_add_node(aff_chunk_t *c, co_mst_irn_t *node)
+{
 	int i;
 
 	if (! nodes_insert(&c->n, node->irn))
@@ -351,68 +418,11 @@ static INLINE void aff_chunk_add_node(aff_chunk_t *c, co_mst_irn_t *node) {
 	}
 }
 
-/**
- * In case there is no phase information for irn, initialize it.
- */
-static void *co_mst_irn_init(ir_phase *ph, const ir_node *irn, void *old) {
-	co_mst_irn_t *res = old ? old : phase_alloc(ph, sizeof(res[0]));
-	co_mst_env_t *env = ph->priv;
-
-	if (!old) {
-		const arch_register_req_t *req;
-		void     *nodes_it = be_ifg_nodes_iter_alloca(env->ifg);
-		ir_node  *neigh;
-		unsigned len;
-
-		res->irn           = irn;
-		res->chunk         = NULL;
-		res->fixed         = 0;
-		res->tmp_col       = -1;
-		res->int_neighs    = NULL;
-		res->int_aff_neigh = 0;
-		res->col           = arch_register_get_index(arch_get_irn_register(env->aenv, irn));
-		res->init_col      = res->col;
-		INIT_LIST_HEAD(&res->list);
-
-		DB((dbg, LEVEL_4, "Creating phase info for %+F\n", irn));
-
-		/* set admissible registers */
-		res->adm_colors = bitset_obstack_alloc(phase_obst(ph), env->n_regs);
-
-		/* Exclude colors not assignable to the irn */
-		req = arch_get_register_req(env->aenv, irn, -1);
-		if (arch_register_req_is(req, limited))
-			rbitset_copy_to_bitset(req->limited, res->adm_colors);
-		else
-			bitset_set_all(res->adm_colors);
-
-		/* exclude global ignore registers as well */
-		bitset_andnot(res->adm_colors, env->ignore_regs);
-
-		/* compute the constraint factor */
-		res->constr_factor = (real_t) (1 + env->n_regs - bitset_popcnt(res->adm_colors)) / env->n_regs;
-
-		/* set the number of interfering affinity neighbours to -1, they are calculated later */
-		res->int_aff_neigh = -1;
-
-		/* build list of interfering neighbours */
-		len = 0;
-		be_ifg_foreach_neighbour(env->ifg, nodes_it, irn, neigh) {
-			if (! arch_irn_is(env->aenv, neigh, ignore)) {
-				obstack_ptr_grow(phase_obst(ph), neigh);
-				++len;
-			}
-		}
-		res->int_neighs = obstack_finish(phase_obst(ph));
-		res->n_neighs   = len;
-	}
-	return res;
-}
-
 /**
  * Check if affinity chunk @p chunk interferes with node @p irn.
  */
-static INLINE int aff_chunk_interferes(const aff_chunk_t *chunk, const ir_node *irn) {
+static inline int aff_chunk_interferes(const aff_chunk_t *chunk, const ir_node *irn)
+{
 	return node_contains(chunk->interfere, irn);
 }
 
@@ -422,7 +432,8 @@ static INLINE int aff_chunk_interferes(const aff_chunk_t *chunk, const ir_node *
  * @param c2    Another chunk
  * @return 1 if there are interferences between nodes of c1 and c2, 0 otherwise.
  */
-static INLINE int aff_chunks_interfere(const aff_chunk_t *c1, const aff_chunk_t *c2) {
+static inline int aff_chunks_interfere(const aff_chunk_t *c1, const aff_chunk_t *c2)
+{
 	int i;
 
 	if (c1 == c2)
@@ -442,7 +453,8 @@ static INLINE int aff_chunks_interfere(const aff_chunk_t *c1, const aff_chunk_t
  * Returns the affinity chunk of @p irn or creates a new
  * one with @p irn as element if there is none assigned.
  */
-static INLINE aff_chunk_t *get_aff_chunk(co_mst_env_t *env, const ir_node *irn) {
+static inline aff_chunk_t *get_aff_chunk(co_mst_env_t *env, const ir_node *irn)
+{
 	co_mst_irn_t *node = get_co_mst_irn(env, irn);
 	return node->chunk;
 }
@@ -452,18 +464,19 @@ static INLINE aff_chunk_t *get_aff_chunk(co_mst_env_t *env, const ir_node *irn)
  * are no interference edges from chunk(src) to chunk(tgt)).
  * @return 1 if successful, 0 if not possible
  */
-static int aff_chunk_absorb(co_mst_env_t *env, const ir_node *src, const ir_node *tgt) {
+static int aff_chunk_absorb(co_mst_env_t *env, const ir_node *src, const ir_node *tgt)
+{
 	aff_chunk_t *c1 = get_aff_chunk(env, src);
 	aff_chunk_t *c2 = get_aff_chunk(env, tgt);
 
 #ifdef DEBUG_libfirm
-		DB((dbg, LEVEL_4, "Attempt to let c1 (id %d): ", c1 ? c1->id : -1));
+		DB((dbg, LEVEL_4, "Attempt to let c1 (id %u): ", c1 ? c1->id : 0));
 		if (c1) {
 			DBG_AFF_CHUNK(env, LEVEL_4, c1);
 		} else {
 			DB((dbg, LEVEL_4, "{%+F}", src));
 		}
-		DB((dbg, LEVEL_4, "\n\tabsorb c2 (id %d): ", c2 ? c2->id : -1));
+		DB((dbg, LEVEL_4, "\n\tabsorb c2 (id %u): ", c2 ? c2->id : 0));
 		if (c2) {
 			DBG_AFF_CHUNK(env, LEVEL_4, c2);
 		} else {
@@ -515,7 +528,7 @@ static int aff_chunk_absorb(co_mst_env_t *env, const ir_node *src, const ir_node
 
 		c1->weight_consistent = 0;
 
-		delete_aff_chunk(env, c2);
+		delete_aff_chunk(c2);
 		goto absorbed;
 	}
 	DB((dbg, LEVEL_4, " ... c1 interferes with c2, skipped\n"));
@@ -529,7 +542,8 @@ absorbed:
 /**
  * Assures that the weight of the given chunk is consistent.
  */
-static void aff_chunk_assure_weight(co_mst_env_t *env, aff_chunk_t *c) {
+static void aff_chunk_assure_weight(co_mst_env_t *env, aff_chunk_t *c)
+{
 	if (! c->weight_consistent) {
 		int w = 0;
 		int idx, len, i;
@@ -546,19 +560,15 @@ static void aff_chunk_assure_weight(co_mst_env_t *env, aff_chunk_t *c) {
 
 			node->chunk = c;
 			if (node->constr_factor > REAL(0.0)) {
-				bitset_pos_t col;
 				bitset_foreach (node->adm_colors, col)
 					c->color_affinity[col].cost += node->constr_factor;
 			}
 
 			if (an != NULL) {
-				neighb_t *neigh;
 				co_gs_foreach_neighb(an, neigh) {
-					const ir_node *m    = neigh->irn;
-					const int     m_idx = get_irn_idx(m);
+					const ir_node *m = neigh->irn;
 
-					/* skip ignore nodes */
-					if (arch_irn_is(env->aenv, m, ignore))
+					if (arch_irn_is_ignore(m))
 						continue;
 
 					w += node_contains(c->n, m) ? neigh->costs : 0;
@@ -570,7 +580,7 @@ static void aff_chunk_assure_weight(co_mst_env_t *env, aff_chunk_t *c) {
 			c->color_affinity[i].cost *= (REAL(1.0) / ARR_LEN(c->n));
 
 		c->weight            = w;
-		// c->weight            = bitset_popcnt(c->nodes);
+		// c->weight            = bitset_popcount(c->nodes);
 		c->weight_consistent = 1;
 	}
 }
@@ -578,8 +588,8 @@ static void aff_chunk_assure_weight(co_mst_env_t *env, aff_chunk_t *c) {
 /**
  * Count the number of interfering affinity neighbours
  */
-static int count_interfering_aff_neighs(co_mst_env_t *env, const affinity_node_t *an) {
-	const neighb_t     *neigh;
+static int count_interfering_aff_neighs(co_mst_env_t *env, const affinity_node_t *an)
+{
 	const ir_node      *irn  = an->irn;
 	const co_mst_irn_t *node = get_co_mst_irn(env, irn);
 	int                res   = 0;
@@ -588,8 +598,7 @@ static int count_interfering_aff_neighs(co_mst_env_t *env, const affinity_node_t
 		const ir_node *n = neigh->irn;
 		int           i;
 
-		/* skip ignore nodes */
-		if (arch_irn_is(env->aenv, n, ignore))
+		if (arch_irn_is_ignore(n))
 			continue;
 
 		/* check if the affinity neighbour interfere */
@@ -611,29 +620,23 @@ static int count_interfering_aff_neighs(co_mst_env_t *env, const affinity_node_t
  * merged if there are no interference edges from one
  * chunk to the other.
  */
-static void build_affinity_chunks(co_mst_env_t *env) {
-	void        *nodes_it = be_ifg_nodes_iter_alloca(env->ifg);
-	aff_edge_t  *edges    = NEW_ARR_F(aff_edge_t, 0);
-	ir_node     *n;
-	int         i, len;
-	aff_chunk_t *curr_chunk;
+static void build_affinity_chunks(co_mst_env_t *env)
+{
+	aff_edge_t *edges = NEW_ARR_F(aff_edge_t, 0);
 
 	/* at first we create the affinity edge objects */
-	be_ifg_foreach_node(env->ifg, nodes_it, n) {
+	be_ifg_foreach_node(env->ifg, n) {
 		int             n_idx = get_irn_idx(n);
 		co_mst_irn_t    *n1;
 		affinity_node_t *an;
 
-		/* skip ignore nodes */
-		if (arch_irn_is(env->aenv, n, ignore))
+		if (arch_irn_is_ignore(n))
 			continue;
 
 		n1 = get_co_mst_irn(env, n);
 		an = get_affinity_info(env->co, n);
 
 		if (an != NULL) {
-			neighb_t *neigh;
-
 			if (n1->int_aff_neigh < 0)
 				n1->int_aff_neigh = count_interfering_aff_neighs(env, an);
 
@@ -648,7 +651,7 @@ static void build_affinity_chunks(co_mst_env_t *env) {
 					aff_edge_t   edge;
 
 					/* skip ignore nodes */
-					if (arch_irn_is(env->aenv, m, ignore))
+					if (arch_irn_is_ignore(m))
 						continue;
 
 					edge.src = n;
@@ -671,41 +674,43 @@ static void build_affinity_chunks(co_mst_env_t *env) {
 	}
 
 	/* now: sort edges and build the affinity chunks */
-	len = ARR_LEN(edges);
+	size_t const len = ARR_LEN(edges);
 	qsort(edges, len, sizeof(edges[0]), cmp_aff_edge);
-	for (i = 0; i < len; ++i) {
+	for (size_t i = 0; i < len; ++i) {
 		DBG((dbg, LEVEL_1, "edge (%u,%u) %f\n", edges[i].src->node_idx, edges[i].tgt->node_idx, edges[i].weight));
 
 		(void)aff_chunk_absorb(env, edges[i].src, edges[i].tgt);
 	}
 
 	/* now insert all chunks into a priority queue */
-	foreach_pset(env->chunkset, curr_chunk) {
+	list_for_each_entry(aff_chunk_t, curr_chunk, &env->chunklist, list) {
 		aff_chunk_assure_weight(env, curr_chunk);
 
-		DBG((dbg, LEVEL_1, "entry #%d", curr_chunk->id));
+		DBG((dbg, LEVEL_1, "entry #%u", curr_chunk->id));
 		DBG_AFF_CHUNK(env, LEVEL_1, curr_chunk);
 		DBG((dbg, LEVEL_1, "\n"));
 
 		pqueue_put(env->chunks, curr_chunk, curr_chunk->weight);
 	}
 
-	foreach_phase_irn(&env->ph, n) {
-		co_mst_irn_t *mirn = get_co_mst_irn(env, n);
+	for (size_t pn = 0; pn < ARR_LEN(env->map.data); ++pn) {
+		co_mst_irn_t *mirn = (co_mst_irn_t*)env->map.data[pn];
+		if (mirn == NULL)
+			continue;
+		if (mirn->chunk != NULL)
+			continue;
 
-		if (mirn->chunk == NULL) {
-			/* no chunk is allocated so far, do it now */
-			aff_chunk_t *curr_chunk = new_aff_chunk(env);
-			aff_chunk_add_node(curr_chunk, mirn);
+		/* no chunk is allocated so far, do it now */
+		aff_chunk_t *curr_chunk = new_aff_chunk(env);
+		aff_chunk_add_node(curr_chunk, mirn);
 
-			aff_chunk_assure_weight(env, curr_chunk);
+		aff_chunk_assure_weight(env, curr_chunk);
 
-			DBG((dbg, LEVEL_1, "entry #%d", curr_chunk->id));
-			DBG_AFF_CHUNK(env, LEVEL_1, curr_chunk);
-			DBG((dbg, LEVEL_1, "\n"));
+		DBG((dbg, LEVEL_1, "entry #%u", curr_chunk->id));
+		DBG_AFF_CHUNK(env, LEVEL_1, curr_chunk);
+		DBG((dbg, LEVEL_1, "\n"));
 
-			pqueue_put(env->chunks, curr_chunk, curr_chunk->weight);
-		}
+		pqueue_put(env->chunks, curr_chunk, curr_chunk->weight);
 	}
 
 	DEL_ARR_F(edges);
@@ -713,18 +718,17 @@ static void build_affinity_chunks(co_mst_env_t *env) {
 
 static __attribute__((unused)) void chunk_order_nodes(co_mst_env_t *env, aff_chunk_t *chunk)
 {
-	pqueue *grow = new_pqueue();
-	const ir_node *max_node = NULL;
-	int max_weight = 0;
-	int i;
+	pqueue_t      *grow       = new_pqueue();
+	ir_node const *max_node   = NULL;
+	int            max_weight = 0;
+	size_t         i;
 
-	for (i = ARR_LEN(chunk->n) - 1; i >= 0; i--) {
-		const ir_node   *irn = chunk->n[i];
+	for (i = ARR_LEN(chunk->n); i != 0;) {
+		const ir_node   *irn = chunk->n[--i];
 		affinity_node_t *an  = get_affinity_info(env->co, irn);
 		int w = 0;
-		neighb_t *neigh;
 
-		if (arch_irn_is(env->aenv, irn, ignore))
+		if (arch_irn_is_ignore(irn))
 			continue;
 
 		if (an) {
@@ -739,20 +743,19 @@ static __attribute__((unused)) void chunk_order_nodes(co_mst_env_t *env, aff_chu
 	}
 
 	if (max_node) {
-		bitset_t *visited = bitset_irg_malloc(env->co->irg);
+		bitset_t *visited = bitset_malloc(get_irg_last_idx(env->co->irg));
 
-		for (i = ARR_LEN(chunk->n) - 1; i >= 0; --i)
-			bitset_add_irn(visited, chunk->n[i]);
+		for (i = ARR_LEN(chunk->n); i != 0;)
+			bitset_set(visited, get_irn_idx(chunk->n[--i]));
 
 		pqueue_put(grow, (void *) max_node, max_weight);
-		bitset_remv_irn(visited, max_node);
+		bitset_clear(visited, get_irn_idx(max_node));
 		i = 0;
 		while (!pqueue_empty(grow)) {
-			ir_node *irn = pqueue_get(grow);
+			ir_node *irn = (ir_node*)pqueue_pop_front(grow);
 			affinity_node_t *an = get_affinity_info(env->co, irn);
-			neighb_t *neigh;
 
-			if (arch_irn_is(env->aenv, irn, ignore))
+			if (arch_irn_is_ignore(irn))
 				continue;
 
 			assert(i <= ARR_LEN(chunk->n));
@@ -764,9 +767,9 @@ static __attribute__((unused)) void chunk_order_nodes(co_mst_env_t *env, aff_chu
 			co_gs_foreach_neighb(an, neigh) {
 				co_mst_irn_t *node = get_co_mst_irn(env, neigh->irn);
 
-				if (bitset_contains_irn(visited, node->irn)) {
+				if (bitset_is_set(visited, get_irn_idx(node->irn))) {
 					pqueue_put(grow, (void *) neigh->irn, neigh->costs);
-					bitset_remv_irn(visited, node->irn);
+					bitset_clear(visited, get_irn_idx(node->irn));
 				}
 			}
 		}
@@ -784,7 +787,7 @@ static void expand_chunk_from(co_mst_env_t *env, co_mst_irn_t *node, bitset_t *v
 {
 	waitq *nodes = new_waitq();
 
-	DBG((dbg, LEVEL_1, "\n\tExpanding new chunk (#%d) from %+F, color %d:", chunk->id, node->irn, col));
+	DBG((dbg, LEVEL_1, "\n\tExpanding new chunk (#%u) from %+F, color %d:", chunk->id, node->irn, col));
 
 	/* init queue and chunk */
 	waitq_put(nodes, node);
@@ -794,19 +797,17 @@ static void expand_chunk_from(co_mst_env_t *env, co_mst_irn_t *node, bitset_t *v
 
 	/* as long as there are nodes in the queue */
 	while (! waitq_empty(nodes)) {
-		co_mst_irn_t    *n  = waitq_get(nodes);
+		co_mst_irn_t    *n  = (co_mst_irn_t*)waitq_get(nodes);
 		affinity_node_t *an = get_affinity_info(env->co, n->irn);
 
 		/* check all affinity neighbors */
 		if (an != NULL) {
-			neighb_t *neigh;
 			co_gs_foreach_neighb(an, neigh) {
 				const ir_node *m    = neigh->irn;
 				int            m_idx = get_irn_idx(m);
 				co_mst_irn_t *n2;
 
-				/* skip ignore nodes */
-				if (arch_irn_is(env->aenv, m, ignore))
+				if (arch_irn_is_ignore(m))
 					continue;
 
 				n2 = get_co_mst_irn(env, m);
@@ -843,8 +844,9 @@ static void expand_chunk_from(co_mst_env_t *env, co_mst_irn_t *node, bitset_t *v
 /**
  * Fragment the given chunk into chunks having given color and not having given color.
  */
-static aff_chunk_t *fragment_chunk(co_mst_env_t *env, int col, aff_chunk_t *c, waitq *tmp) {
-	bitset_t    *visited = bitset_irg_malloc(env->co->irg);
+static aff_chunk_t *fragment_chunk(co_mst_env_t *env, int col, aff_chunk_t *c, waitq *tmp)
+{
+	bitset_t    *visited = bitset_malloc(get_irg_last_idx(env->co->irg));
 	int         idx, len;
 	aff_chunk_t *best = NULL;
 
@@ -864,12 +866,12 @@ static aff_chunk_t *fragment_chunk(co_mst_env_t *env, int col, aff_chunk_t *c, w
 		if (get_mst_irn_col(node) == col) {
 			decider        = decider_has_color;
 			check_for_best = 1;
-			DBG((dbg, LEVEL_4, "\tcolor %d wanted", col));
+			DBG((dbg, LEVEL_4, "\tcolor %d wanted\n", col));
 		}
 		else {
 			decider        = decider_hasnot_color;
 			check_for_best = 0;
-			DBG((dbg, LEVEL_4, "\tcolor %d forbidden", col));
+			DBG((dbg, LEVEL_4, "\tcolor %d forbidden\n", col));
 		}
 
 		/* create a new chunk starting at current node */
@@ -893,8 +895,8 @@ static aff_chunk_t *fragment_chunk(co_mst_env_t *env, int col, aff_chunk_t *c, w
  * Resets the temporary fixed color of all nodes within wait queue @p nodes.
  * ATTENTION: the queue is empty after calling this function!
  */
-static INLINE void reject_coloring(struct list_head *nodes) {
-	co_mst_irn_t *n, *temp;
+static inline void reject_coloring(struct list_head *nodes)
+{
 	DB((dbg, LEVEL_4, "\treject coloring for"));
 	list_for_each_entry_safe(co_mst_irn_t, n, temp, nodes, list) {
 		DB((dbg, LEVEL_4, " %+F", n->irn));
@@ -905,8 +907,8 @@ static INLINE void reject_coloring(struct list_head *nodes) {
 	DB((dbg, LEVEL_4, "\n"));
 }
 
-static INLINE void materialize_coloring(struct list_head *nodes) {
-	co_mst_irn_t *n, *temp;
+static inline void materialize_coloring(struct list_head *nodes)
+{
 	list_for_each_entry_safe(co_mst_irn_t, n, temp, nodes, list) {
 		assert(n->tmp_col >= 0);
 		n->col     = n->tmp_col;
@@ -915,7 +917,7 @@ static INLINE void materialize_coloring(struct list_head *nodes) {
 	}
 }
 
-static INLINE void set_temp_color(co_mst_irn_t *node, int col, struct list_head *changed)
+static inline void set_temp_color(co_mst_irn_t *node, int col, struct list_head *changed)
 {
 	assert(col >= 0);
 	assert(!node->fixed);
@@ -927,7 +929,7 @@ static INLINE void set_temp_color(co_mst_irn_t *node, int col, struct list_head
 	node->tmp_col = col;
 }
 
-static INLINE int is_loose(co_mst_irn_t *node)
+static inline int is_loose(co_mst_irn_t *node)
 {
 	return !node->fixed && node->tmp_col < 0;
 }
@@ -935,11 +937,12 @@ static INLINE int is_loose(co_mst_irn_t *node)
 /**
  * Determines the costs for each color if it would be assigned to node @p node.
  */
-static void determine_color_costs(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *costs) {
-	int *neigh_cols = alloca(env->n_regs * sizeof(*neigh_cols));
-	int n_loose = 0;
+static void determine_color_costs(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *costs)
+{
+	int   *neigh_cols = ALLOCAN(int, env->n_regs);
+	int    n_loose    = 0;
 	real_t coeff;
-	int i;
+	int    i;
 
 	for (i = 0; i < env->n_regs; ++i) {
 		neigh_cols[i] = 0;
@@ -971,7 +974,8 @@ static int recolor_nodes(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *cost
  * Tries to change node to a color but @p explude_col.
  * @return 1 if succeeded, 0 otherwise.
  */
-static int change_node_color_excluded(co_mst_env_t *env, co_mst_irn_t *node, int exclude_col, struct list_head *changed, int depth, int *max_depth, int *trip) {
+static int change_node_color_excluded(co_mst_env_t *env, co_mst_irn_t *node, int exclude_col, struct list_head *changed, int depth, int *max_depth, int *trip)
+{
 	int col = get_mst_irn_col(node);
 	int res = 0;
 
@@ -984,7 +988,7 @@ static int change_node_color_excluded(co_mst_env_t *env, co_mst_irn_t *node, int
 
 	/* The node has the color it should not have _and_ has not been visited yet. */
 	if (is_loose(node)) {
-		col_cost_t *costs = alloca(env->n_regs * sizeof(costs[0]));
+		col_cost_t *costs = ALLOCAN(col_cost_t, env->n_regs);
 
 		/* Get the costs for giving the node a specific color. */
 		determine_color_costs(env, node, costs);
@@ -1007,7 +1011,8 @@ static int change_node_color_excluded(co_mst_env_t *env, co_mst_irn_t *node, int
  * ATTENTION: Expect @p costs already sorted by increasing costs.
  * @return 1 if coloring could be applied, 0 otherwise.
  */
-static int recolor_nodes(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *costs, struct list_head *changed, int depth, int *max_depth, int *trip) {
+static int recolor_nodes(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *costs, struct list_head *changed, int depth, int *max_depth, int *trip)
+{
 	int   i;
 	struct list_head local_changed;
 
@@ -1015,21 +1020,25 @@ static int recolor_nodes(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *cost
 	if (depth > *max_depth)
 		*max_depth = depth;
 
-	if (depth >= recolor_limit)
-		return 0;
-
 	DBG((dbg, LEVEL_4, "\tRecoloring %+F with color-costs", node->irn));
 	DBG_COL_COST(env, LEVEL_4, costs);
 	DB((dbg, LEVEL_4, "\n"));
 
+	if (depth >= recolor_limit) {
+		DBG((dbg, LEVEL_4, "\tHit recolor limit\n"));
+		return 0;
+	}
+
 	for (i = 0; i < env->n_regs; ++i) {
 		int tgt_col  = costs[i].col;
 		int neigh_ok = 1;
 		int j;
 
 		/* If the costs for that color (and all successive) are infinite, bail out we won't make it anyway. */
-		if (costs[i].cost == REAL(0.0))
+		if (costs[i].cost == REAL(0.0)) {
+			DBG((dbg, LEVEL_4, "\tAll further colors forbidden\n"));
 			return 0;
+		}
 
 		/* Set the new color of the node and mark the node as temporarily fixed. */
 		assert(node->tmp_col < 0 && "Node must not have been temporary fixed.");
@@ -1044,8 +1053,7 @@ static int recolor_nodes(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *cost
 
 			neigh = node->int_neighs[j];
 
-			/* skip ignore nodes */
-			if (arch_irn_is(env->aenv, neigh, ignore))
+			if (arch_irn_is_ignore(neigh))
 				continue;
 
 			nn = get_co_mst_irn(env, neigh);
@@ -1082,14 +1090,16 @@ static int recolor_nodes(co_mst_env_t *env, co_mst_irn_t *node, col_cost_t *cost
 		}
 	}
 
+	DBG((dbg, LEVEL_4, "\tAll colors failed\n"));
 	return 0;
 }
 
 /**
- * Tries to bring node @p node and all it's neighbours to color @p tgt_col.
+ * Tries to bring node @p node and all its neighbours to color @p tgt_col.
  * @return 1 if color @p col could be applied, 0 otherwise
  */
-static int change_node_color(co_mst_env_t *env, co_mst_irn_t *node, int tgt_col, struct list_head *changed) {
+static int change_node_color(co_mst_env_t *env, co_mst_irn_t *node, int tgt_col, struct list_head *changed)
+{
 	int col = get_mst_irn_col(node);
 
 	/* if node already has the target color -> good, temporary fix it */
@@ -1102,7 +1112,7 @@ static int change_node_color(co_mst_env_t *env, co_mst_irn_t *node, int tgt_col,
 
 	/*
 		Node has not yet a fixed color and target color is admissible
-		-> try to recolor node and it's affinity neighbours
+		-> try to recolor node and its affinity neighbours
 	*/
 	if (is_loose(node) && bitset_is_set(node->adm_colors, tgt_col)) {
 		col_cost_t *costs = env->single_cols[tgt_col];
@@ -1140,29 +1150,32 @@ static int change_node_color(co_mst_env_t *env, co_mst_irn_t *node, int tgt_col,
  * Tries to color an affinity chunk (or at least a part of it).
  * Inserts uncolored parts of the chunk as a new chunk into the priority queue.
  */
-static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
+static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c)
+{
 	aff_chunk_t *best_chunk   = NULL;
 	int         n_nodes       = ARR_LEN(c->n);
 	int         best_color    = -1;
 	int         n_int_chunks  = 0;
 	waitq       *tmp_chunks   = new_waitq();
 	waitq       *best_starts  = NULL;
-	col_cost_t  *order        = alloca(env->n_regs * sizeof(order[0]));
+	col_cost_t  *order        = ALLOCANZ(col_cost_t, env->n_regs);
 	bitset_t    *visited;
-	int         idx, len, i, nidx, pos;
+	int         i;
+	size_t      idx;
+	size_t      len;
+	size_t      nidx;
+	size_t      pos;
 	struct list_head changed;
 
-	DB((dbg, LEVEL_2, "fragmentizing chunk #%d", c->id));
+	DB((dbg, LEVEL_2, "fragmentizing chunk #%u", c->id));
 	DBG_AFF_CHUNK(env, LEVEL_2, c);
 	DB((dbg, LEVEL_2, "\n"));
 
-	stat_ev_ctx_push_fmt("heur4_color_chunk", "%d", c->id);
+	stat_ev_ctx_push_fmt("heur4_color_chunk", "%u", c->id);
 
 	++env->chunk_visited;
 
 	/* compute color preference */
-	memset(order, 0, env->n_regs * sizeof(order[0]));
-
 	for (pos = 0, len = ARR_LEN(c->interfere); pos < len; ++pos) {
 		const ir_node *n = c->interfere[pos];
 		co_mst_irn_t *node = get_co_mst_irn(env, n);
@@ -1198,19 +1211,20 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 	 * TODO Sebastian: Perhaps we should at all nodes and figure out
 	 * a suitable color using costs as done above (determine_color_costs).
 	 */
-	for (i = 0; i < env->k; ++i) {
+	for (i = 0; i < env->n_regs; ++i) {
 		int         col = order[i].col;
-		waitq       *good_starts = new_waitq();
+		waitq       *good_starts;
 		aff_chunk_t *local_best;
 		int          n_succeeded;
 
 		/* skip ignore colors */
-		if (bitset_is_set(env->ignore_regs, col))
+		if (!bitset_is_set(env->allocatable_regs, col))
 			continue;
 
 		DB((dbg, LEVEL_2, "\ttrying color %d\n", col));
 
 		n_succeeded = 0;
+		good_starts = new_waitq();
 
 		/* try to bring all nodes of given chunk to the current color. */
 		for (idx = 0, len = ARR_LEN(c->n); idx < len; ++idx) {
@@ -1249,8 +1263,10 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 		}
 
 		/* try next color when failed */
-		if (n_succeeded == 0)
+		if (n_succeeded == 0) {
+			del_waitq(good_starts);
 			continue;
+		}
 
 		/* fragment the chunk according to the coloring */
 		local_best = fragment_chunk(env, col, c, tmp_chunks);
@@ -1260,7 +1276,7 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 		if (local_best) {
 			aff_chunk_assure_weight(env, local_best);
 
-			DB((dbg, LEVEL_3, "\t\tlocal best chunk (id %d) for color %d: ", local_best->id, col));
+			DB((dbg, LEVEL_3, "\t\tlocal best chunk (id %u) for color %d: ", local_best->id, col));
 			DBG_AFF_CHUNK(env, LEVEL_3, local_best);
 
 			if (! best_chunk || best_chunk->weight < local_best->weight) {
@@ -1269,7 +1285,7 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 				if (best_starts)
 					del_waitq(best_starts);
 				best_starts = good_starts;
-				DB((dbg, LEVEL_3, "\n\t\t... setting global best chunk (id %d), color %d\n", best_chunk->id, best_color));
+				DB((dbg, LEVEL_3, "\n\t\t... setting global best chunk (id %u), color %d\n", best_chunk->id, best_color));
 			} else {
 				DB((dbg, LEVEL_3, "\n\t\t... omitting, global best is better\n"));
 				del_waitq(good_starts);
@@ -1288,9 +1304,9 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 
 	/* free all intermediate created chunks except best one */
 	while (! waitq_empty(tmp_chunks)) {
-		aff_chunk_t *tmp = waitq_get(tmp_chunks);
+		aff_chunk_t *tmp = (aff_chunk_t*)waitq_get(tmp_chunks);
 		if (tmp != best_chunk)
-			delete_aff_chunk(env, tmp);
+			delete_aff_chunk(tmp);
 	}
 	del_waitq(tmp_chunks);
 
@@ -1301,7 +1317,7 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 		return;
 	}
 
-	DB((dbg, LEVEL_2, "\tbest chunk #%d ", best_chunk->id));
+	DB((dbg, LEVEL_2, "\tbest chunk #%u ", best_chunk->id));
 	DBG_AFF_CHUNK(env, LEVEL_2, best_chunk);
 	DB((dbg, LEVEL_2, "using color %d\n", best_color));
 
@@ -1311,7 +1327,7 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 		int res;
 
 		/* bring the node to the color. */
-		DB((dbg, LEVEL_4, "\tManifesting color %d for %+F, chunk #%d\n", best_color, node->irn, best_chunk->id));
+		DB((dbg, LEVEL_4, "\tManifesting color %d for %+F, chunk #%u\n", best_color, node->irn, best_chunk->id));
 		INIT_LIST_HEAD(&changed);
 		stat_ev_tim_push();
 		res = change_node_color(env, node, best_color, &changed);
@@ -1351,7 +1367,7 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 	}
 
 	/* fragment the remaining chunk */
-	visited = bitset_irg_malloc(env->co->irg);
+	visited = bitset_malloc(get_irg_last_idx(env->co->irg));
 	for (idx = 0, len = ARR_LEN(best_chunk->n); idx < len; ++idx)
 		bitset_set(visited, get_irn_idx(best_chunk->n[idx]));
 
@@ -1374,7 +1390,7 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 	}
 
 	/* clear obsolete chunks and free some memory */
-	delete_aff_chunk(env, best_chunk);
+	delete_aff_chunk(best_chunk);
 	bitset_free(visited);
 	if (best_starts)
 		del_waitq(best_starts);
@@ -1385,37 +1401,33 @@ static void color_aff_chunk(co_mst_env_t *env, aff_chunk_t *c) {
 /**
  * Main driver for mst safe coalescing algorithm.
  */
-int co_solve_heuristic_mst(copy_opt_t *co) {
-	unsigned     n_regs       = co->cls->n_regs;
-	bitset_t     *ignore_regs = bitset_alloca(n_regs);
-	unsigned     i, j, k;
-	ir_node      *irn;
-	co_mst_env_t mst_env;
+static int co_solve_heuristic_mst(copy_opt_t *co)
+{
+	last_chunk_id = 0;
 
 	stat_ev_tim_push();
 
 	/* init phase */
-	phase_init(&mst_env.ph, "co_mst", co->irg, PHASE_DEFAULT_GROWTH, co_mst_irn_init, &mst_env);
+	co_mst_env_t mst_env;
+	ir_nodemap_init(&mst_env.map, co->irg);
+	obstack_init(&mst_env.obst);
 
-	k = be_put_ignore_regs(co->cenv->birg, co->cls, ignore_regs);
-	k = n_regs - k;
+	unsigned const n_regs = co->cls->n_regs;
 
-	mst_env.n_regs        = n_regs;
-	mst_env.k             = k;
-	mst_env.chunks        = new_pqueue();
-	mst_env.co            = co;
-	mst_env.ignore_regs   = ignore_regs;
-	mst_env.ifg           = co->cenv->ifg;
-	mst_env.aenv          = co->aenv;
-	mst_env.chunkset      = pset_new_ptr(512);
-	mst_env.chunk_visited = 0;
-	mst_env.single_cols   = phase_alloc(&mst_env.ph, sizeof(*mst_env.single_cols) * n_regs);
+	mst_env.n_regs           = n_regs;
+	mst_env.chunks           = new_pqueue();
+	mst_env.co               = co;
+	mst_env.allocatable_regs = co->cenv->allocatable_regs;
+	mst_env.ifg              = co->cenv->ifg;
+	INIT_LIST_HEAD(&mst_env.chunklist);
+	mst_env.chunk_visited    = 0;
+	mst_env.single_cols      = OALLOCN(&mst_env.obst, col_cost_t*, n_regs);
 
-	for (i = 0; i < n_regs; ++i) {
-		col_cost_t *vec = phase_alloc(&mst_env.ph, sizeof(*vec) * n_regs);
+	for (unsigned i = 0; i < n_regs; ++i) {
+		col_cost_t *vec = OALLOCN(&mst_env.obst, col_cost_t, n_regs);
 
 		mst_env.single_cols[i] = vec;
-		for (j = 0; j < n_regs; ++j) {
+		for (unsigned j = 0; j < n_regs; ++j) {
 			vec[j].col  = j;
 			vec[j].cost = REAL(0.0);
 		}
@@ -1433,37 +1445,36 @@ int co_solve_heuristic_mst(copy_opt_t *co) {
 
 	/* color chunks as long as there are some */
 	while (! pqueue_empty(mst_env.chunks)) {
-		aff_chunk_t *chunk = pqueue_get(mst_env.chunks);
+		aff_chunk_t *chunk = (aff_chunk_t*)pqueue_pop_front(mst_env.chunks);
 
 		color_aff_chunk(&mst_env, chunk);
-		DB((dbg, LEVEL_4, "<<<====== Coloring chunk (%d) done\n", chunk->id));
-		delete_aff_chunk(&mst_env, chunk);
+		DB((dbg, LEVEL_4, "<<<====== Coloring chunk (%u) done\n", chunk->id));
+		delete_aff_chunk(chunk);
 	}
 
 	/* apply coloring */
-	foreach_phase_irn(&mst_env.ph, irn) {
-		co_mst_irn_t *mirn;
+	for (size_t pn = 0; pn < ARR_LEN(mst_env.map.data); ++pn) {
+		co_mst_irn_t *mirn = (co_mst_irn_t*)mst_env.map.data[pn];
 		const arch_register_t *reg;
-
-		if (arch_irn_is(mst_env.aenv, irn, ignore))
+		if (mirn == NULL)
+			continue;
+		ir_node *const irn = get_idx_irn(co->irg, pn);
+		if (arch_irn_is_ignore(irn))
 			continue;
-
-		mirn = get_co_mst_irn(&mst_env, irn);
-		// assert(mirn->fixed && "Node should have fixed color");
 
 		/* skip nodes where color hasn't changed */
 		if (mirn->init_col == mirn->col)
 			continue;
 
 		reg = arch_register_for_index(co->cls, mirn->col);
-		arch_set_irn_register(co->aenv, irn, reg);
+		arch_set_irn_register(irn, reg);
 		DB((dbg, LEVEL_1, "%+F set color from %d to %d\n", irn, mirn->init_col, mirn->col));
 	}
 
 	/* free allocated memory */
 	del_pqueue(mst_env.chunks);
-	phase_free(&mst_env.ph);
-	del_pset(mst_env.chunkset);
+	obstack_free(&mst_env.obst, NULL);
+	ir_nodemap_destroy(&mst_env.map);
 
 	stat_ev_tim_pop("heur4_total");
 
@@ -1476,17 +1487,21 @@ static const lc_opt_table_entry_t options[] = {
 	LC_OPT_LAST
 };
 
-
-void be_init_copyheur4(void) {
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_copyheur4)
+void be_init_copyheur4(void)
+{
 	lc_opt_entry_t *be_grp = lc_opt_get_grp(firm_opt_get_root(), "be");
 	lc_opt_entry_t *ra_grp = lc_opt_get_grp(be_grp, "ra");
 	lc_opt_entry_t *chordal_grp = lc_opt_get_grp(ra_grp, "chordal");
 	lc_opt_entry_t *co_grp = lc_opt_get_grp(chordal_grp, "co");
 	lc_opt_entry_t *heur4_grp = lc_opt_get_grp(co_grp, "heur4");
 
+	static co_algo_info copyheur = {
+		co_solve_heuristic_mst, 0
+	};
+
 	lc_opt_add_table(heur4_grp, options);
+	be_register_copyopt("heur4", &copyheur);
+
 	FIRM_DBG_REGISTER(dbg, "firm.be.co.heur4");
 }
-
-
-BE_REGISTER_MODULE_CONSTRUCTOR(be_init_copyheur4);