X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbechordal_main.c;h=1a7f46bd32001fab0544176559733eb63aad5418;hb=883aa8413813772449233d98b7faeaafe76f9534;hp=b4160d0a740b5d19a4152be42dfebb5e9c85c987;hpb=b72981ec9f44198b3fe526251a6863ebdaea841e;p=libfirm

diff --git a/ir/be/bechordal_main.c b/ir/be/bechordal_main.c
index b4160d0a7..1a7f46bd3 100644
--- a/ir/be/bechordal_main.c
+++ b/ir/be/bechordal_main.c
@@ -1,18 +1,34 @@
-/**
- * @file   bechordal_main.c
- * @date   29.11.2005
- * @author Sebastian Hack
- * @cvs-id $Id$
+/*
+ * Copyright (C) 1995-2007 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.
  *
- * Copyright (C) 2005-2006 Universitaet Karlsruhe
- * Released under the GPL
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
  *
- * Driver for the chordal register allocator.
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
+ */
+
+/**
+ * @file
+ * @brief       Driver for the chordal register allocator.
+ * @author      Sebastian Hack
+ * @date        29.11.2005
+ * @version     $Id$
  */
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
+#include <stdlib.h>
 #include <time.h>
 
 #include "obst.h"
@@ -22,11 +38,9 @@
 #include "iterator.h"
 #include "firm_config.h"
 
-#ifdef WITH_LIBCORE
 #include <libcore/lc_opts.h>
 #include <libcore/lc_opts_enum.h>
 #include <libcore/lc_timing.h>
-#endif /* WITH_LIBCORE */
 
 #include "ircons_t.h"
 #include "irmode_t.h"
@@ -43,24 +57,29 @@
 #include "debug.h"
 #include "xmalloc.h"
 #include "execfreq.h"
+#include "iredges_t.h"
 
 #include "bechordal_t.h"
 #include "beabi.h"
 #include "bejavacoal.h"
 #include "beutil.h"
 #include "besched.h"
-#include "benumb_t.h"
 #include "besched_t.h"
 #include "belive_t.h"
-#include "bearch.h"
+#include "bearch_t.h"
 #include "beifg_t.h"
 #include "beifg_impl.h"
 #include "benode_t.h"
 #include "bestatevent.h"
+#include "bestat.h"
+#include "bemodule.h"
+#include "be_t.h"
+#include "bera.h"
+#include "beirg_t.h"
 
 #include "bespillbelady.h"
-#include "bespillmorgan.h"
 #include "bespillslots.h"
+#include "bespilloptions.h"
 #include "belower.h"
 
 #ifdef WITH_ILP
@@ -72,80 +91,23 @@
 #include "becopyopt.h"
 #include "bessadestr.h"
 #include "beverify.h"
-#include "bespillcost.h"
 #include "benode_t.h"
 
-void be_ra_chordal_check(be_chordal_env_t *chordal_env) {
-	const arch_env_t *arch_env = chordal_env->birg->main_env->arch_env;
-	struct obstack ob;
-	pmap_entry *pme;
-	ir_node **nodes, *n1, *n2;
-	int i, o;
-	DEBUG_ONLY(firm_dbg_module_t *dbg = chordal_env->dbg;)
-
-	/* Collect all irns */
-	obstack_init(&ob);
-	pmap_foreach(chordal_env->border_heads, pme) {
-		border_t *curr;
-		struct list_head *head = pme->value;
-		list_for_each_entry(border_t, curr, head, list)
-			if (curr->is_def && curr->is_real)
-				if (arch_get_irn_reg_class(arch_env, curr->irn, -1) == chordal_env->cls)
-					obstack_ptr_grow(&ob, curr->irn);
-	}
-	obstack_ptr_grow(&ob, NULL);
-	nodes = (ir_node **) obstack_finish(&ob);
-
-	/* Check them */
-	for (i = 0, n1 = nodes[i]; n1; n1 = nodes[++i]) {
-		const arch_register_t *n1_reg, *n2_reg;
-
-		n1_reg = arch_get_irn_register(arch_env, n1);
-		if (!arch_reg_is_allocatable(arch_env, n1, -1, n1_reg)) {
-			DBG((dbg, 0, "Register %s assigned to %+F is not allowed\n", n1_reg->name, n1));
-			assert(0 && "Register constraint does not hold");
-		}
-		for (o = i+1, n2 = nodes[o]; n2; n2 = nodes[++o]) {
-			n2_reg = arch_get_irn_register(arch_env, n2);
-			if (values_interfere(chordal_env->lv, n1, n2) && n1_reg == n2_reg) {
-				DBG((dbg, 0, "Values %+F and %+F interfere and have the same register assigned: %s\n", n1, n2, n1_reg->name));
-				assert(0 && "Interfering values have the same color!");
-			}
-		}
-	}
-	obstack_free(&ob, NULL);
-}
-
-int nodes_interfere(const be_chordal_env_t *env, const ir_node *a, const ir_node *b)
-{
-	if(env->ifg)
-		return be_ifg_connected(env->ifg, a, b);
-	else
-		return values_interfere(env->lv, a, b);
-}
-
-
 static be_ra_chordal_opts_t options = {
 	BE_CH_DUMP_NONE,
-	BE_CH_SPILL_BELADY,
-	BE_CH_IFG_STD,
 	BE_CH_LOWER_PERM_SWAP,
 	BE_CH_VRFY_WARN,
+	"",
+	""
 };
 
-/* coalesce spill slots */
-static int coalesce_spill_slots = 1;
-
-/** The name of the file where the statistics are put to. */
-static char stat_file_name[2048];
-
-/** Enable extreme live range splitting. */
-static int be_elr_split = 0;
+typedef struct _post_spill_env_t {
+	be_chordal_env_t            cenv;
+	be_irg_t                    *birg;
+	const arch_register_class_t *cls;
+	double                      pre_spill_cost;
+} post_spill_env_t;
 
-/** Assumed loop iteration count for execution frequency estimation. */
-static int be_loop_weight = 9;
-
-#ifdef WITH_LIBCORE
 static be_ra_timer_t ra_timer = {
 	NULL,
 	NULL,
@@ -160,25 +122,6 @@ static be_ra_timer_t ra_timer = {
 	NULL,
 };
 
-static const lc_opt_enum_int_items_t spill_items[] = {
-	{ "morgan", BE_CH_SPILL_MORGAN },
-	{ "belady", BE_CH_SPILL_BELADY },
-#ifdef WITH_ILP
-	{ "remat",  BE_CH_SPILL_REMAT },
-#endif /* WITH_ILP */
-	{ NULL, 0 }
-};
-
-static const lc_opt_enum_int_items_t ifg_flavor_items[] = {
-	{ "std",     BE_CH_IFG_STD     },
-	{ "fast",    BE_CH_IFG_FAST    },
-	{ "clique",  BE_CH_IFG_CLIQUE  },
-	{ "pointer", BE_CH_IFG_POINTER },
-	{ "list",    BE_CH_IFG_LIST    },
-	{ "check",   BE_CH_IFG_CHECK   },
-	{ NULL,      0                 }
-};
-
 static const lc_opt_enum_int_items_t lower_perm_items[] = {
 	{ "copy", BE_CH_LOWER_PERM_COPY },
 	{ "swap", BE_CH_LOWER_PERM_SWAP },
@@ -190,6 +133,7 @@ static const lc_opt_enum_int_items_t lower_perm_stat_items[] = {
 };
 
 static const lc_opt_enum_int_items_t dump_items[] = {
+	{ "none",       BE_CH_DUMP_NONE       },
 	{ "spill",      BE_CH_DUMP_SPILL      },
 	{ "live",       BE_CH_DUMP_LIVE       },
 	{ "color",      BE_CH_DUMP_COLOR      },
@@ -211,14 +155,6 @@ static const lc_opt_enum_int_items_t be_ch_vrfy_items[] = {
 	{ NULL, 0 }
 };
 
-static lc_opt_enum_int_var_t spill_var = {
-	&options.spill_method, spill_items
-};
-
-static lc_opt_enum_int_var_t ifg_flavor_var = {
-	&options.ifg_flavor, ifg_flavor_items
-};
-
 static lc_opt_enum_int_var_t lower_perm_var = {
 	&options.lower_perm_opt, lower_perm_items
 };
@@ -232,41 +168,12 @@ static lc_opt_enum_int_var_t be_ch_vrfy_var = {
 };
 
 static const lc_opt_table_entry_t be_chordal_options[] = {
-	LC_OPT_ENT_STR      ("statfile",      "the name of the statisctics file", stat_file_name, sizeof(stat_file_name)),
-	LC_OPT_ENT_BOOL     ("spill.coal",    "coalesce the spill slots", &coalesce_spill_slots),
-	LC_OPT_ENT_ENUM_INT ("spill",	      "spill method", &spill_var),
-	LC_OPT_ENT_ENUM_PTR ("ifg",           "interference graph flavour", &ifg_flavor_var),
 	LC_OPT_ENT_ENUM_PTR ("perm",          "perm lowering options", &lower_perm_var),
 	LC_OPT_ENT_ENUM_MASK("dump",          "select dump phases", &dump_var),
 	LC_OPT_ENT_ENUM_PTR ("vrfy",          "verify options", &be_ch_vrfy_var),
-	LC_OPT_ENT_BOOL     ("elrsplit",      "enable extreme live range splitting", &be_elr_split),
-	LC_OPT_ENT_INT      ("loop_weight",   "assumed amount of loop iterations for guessing the execution frequency", &be_loop_weight),
-	{ NULL }
+	LC_OPT_LAST
 };
 
-extern void be_spill_remat_register_options(lc_opt_entry_t *ent);
-
-
-static void be_ra_chordal_register_options(lc_opt_entry_t *grp)
-{
-	static int run_once = 0;
-	lc_opt_entry_t *chordal_grp;
-
-	if (! run_once) {
-		run_once    = 1;
-		chordal_grp = lc_opt_get_grp(grp, "chordal");
-
-		lc_opt_add_table(chordal_grp, be_chordal_options);
-
-		co_register_options(chordal_grp);
-		be_java_coal_register_options(chordal_grp);
-#ifdef WITH_ILP
-		be_spill_remat_register_options(chordal_grp);
-#endif
-	}
-}
-#endif /* WITH_LIBCORE */
-
 static void dump(unsigned mask, ir_graph *irg,
 				 const arch_register_class_t *cls,
 				 const char *suffix,
@@ -283,56 +190,6 @@ static void dump(unsigned mask, ir_graph *irg,
 	}
 }
 
-static void put_ignore_colors(be_chordal_env_t *chordal_env)
-{
-	int n_colors = chordal_env->cls->n_regs;
-	int i;
-
-	bitset_clear_all(chordal_env->ignore_colors);
-	be_abi_put_ignore_regs(chordal_env->birg->abi, chordal_env->cls, chordal_env->ignore_colors);
-	for(i = 0; i < n_colors; ++i)
-		if(arch_register_type_is(&chordal_env->cls->regs[i], ignore))
-			bitset_set(chordal_env->ignore_colors, i);
-}
-
-FILE *be_chordal_open(const be_chordal_env_t *env, const char *prefix, const char *suffix)
-{
-	char buf[1024];
-
-	ir_snprintf(buf, sizeof(buf), "%s%F_%s%s", prefix, env->irg, env->cls->name, suffix);
-	return fopen(buf, "wt");
-}
-
-void check_ifg_implementations(be_chordal_env_t *chordal_env)
-{
-	FILE *f;
-
-	f = be_chordal_open(chordal_env, "std", ".log");
-	chordal_env->ifg = be_ifg_std_new(chordal_env);
-	be_ifg_check_sorted_to_file(chordal_env->ifg, f);
-	fclose(f);
-
-	f = be_chordal_open(chordal_env, "list", ".log");
-	be_ifg_free(chordal_env->ifg);
-	chordal_env->ifg = be_ifg_list_new(chordal_env);
-	be_ifg_check_sorted_to_file(chordal_env->ifg, f);
-	fclose(f);
-
-	f = be_chordal_open(chordal_env, "clique", ".log");
-	be_ifg_free(chordal_env->ifg);
-	chordal_env->ifg = be_ifg_clique_new(chordal_env);
-	be_ifg_check_sorted_to_file(chordal_env->ifg, f);
-	fclose(f);
-
-	f = be_chordal_open(chordal_env, "pointer", ".log");
-	be_ifg_free(chordal_env->ifg);
-	chordal_env->ifg = be_ifg_pointer_new(chordal_env);
-	be_ifg_check_sorted_to_file(chordal_env->ifg, f);
-	fclose(f);
-
-	chordal_env->ifg = NULL;
-};
-
 /**
  * Checks for every reload if it's user can perform the load on itself.
  */
@@ -346,12 +203,9 @@ static void memory_operand_walker(ir_node *irn, void *env) {
 	if (! be_is_Reload(irn))
 		return;
 
-	/* always use addressmode, it's good for x86 */
-#if 0
 	/* only use memory operands, if the reload is only used by 1 node */
 	if(get_irn_n_edges(irn) > 1)
 		return;
-#endif
 
 	spill = be_get_Reload_mem(irn);
 	block = get_nodes_block(irn);
@@ -360,11 +214,9 @@ static void memory_operand_walker(ir_node *irn, void *env) {
 		ir_node *src = get_edge_src_irn(edge);
 		int     pos  = get_edge_src_pos(edge);
 
-		if (! src)
-			continue;
+		assert(src && "outedges broken!");
 
 		if (get_nodes_block(src) == block && arch_possible_memory_operand(aenv, src, pos)) {
-			DBG((cenv->dbg, LEVEL_3, "performing memory operand %+F at %+F\n", irn, src));
 			arch_perform_memory_operand(aenv, src, spill, pos);
 		}
 	}
@@ -372,8 +224,8 @@ static void memory_operand_walker(ir_node *irn, void *env) {
 	/* kill the Reload */
 	if (get_irn_n_edges(irn) == 0) {
 		sched_remove(irn);
-		set_irn_n(irn, 0, new_Bad());
-		set_irn_n(irn, 1, new_Bad());
+		set_irn_n(irn, be_pos_Reload_mem, new_Bad());
+		set_irn_n(irn, be_pos_Reload_frame, new_Bad());
 	}
 }
 
@@ -397,17 +249,18 @@ typedef struct _node_stat_t {
 } node_stat_t;
 
 struct node_stat_walker {
-	node_stat_t *stat;
-	const be_chordal_env_t *cenv;
-	bitset_t *mem_phis;
+	node_stat_t      *stat;
+	const arch_env_t *arch_env;
+	bitset_t         *mem_phis;
+	const arch_register_class_t *cls;
 };
 
 static void node_stat_walker(ir_node *irn, void *data)
 {
-	struct node_stat_walker *env = data;
-	const arch_env_t *aenv       = env->cenv->birg->main_env->arch_env;
+	struct node_stat_walker *env  = data;
+	const arch_env_t        *aenv = env->arch_env;
 
-	if(arch_irn_consider_in_reg_alloc(aenv, env->cenv->cls, irn)) {
+	if (arch_irn_consider_in_reg_alloc(aenv, env->cls, irn)) {
 
 		/* if the node is a normal phi */
 		if(is_Phi(irn))
@@ -442,15 +295,16 @@ static void node_stat_walker(ir_node *irn, void *data)
 	}
 }
 
-static void node_stats(const be_chordal_env_t *cenv, node_stat_t *stat)
+static void node_stats(be_irg_t *birg, const arch_register_class_t *cls, node_stat_t *stat)
 {
 	struct node_stat_walker env;
 
 	memset(stat, 0, sizeof(stat[0]));
-	env.cenv     = cenv;
-	env.mem_phis = bitset_irg_malloc(cenv->irg);
+	env.arch_env = birg->main_env->arch_env;
+	env.mem_phis = bitset_irg_malloc(birg->irg);
 	env.stat     = stat;
-	irg_walk_graph(cenv->irg, NULL, node_stat_walker, &env);
+	env.cls      = cls;
+	irg_walk_graph(birg->irg, NULL, node_stat_walker, &env);
 	bitset_free(env.mem_phis);
 }
 
@@ -476,7 +330,6 @@ static unsigned int count_insns(ir_graph *irg)
 	return cnt;
 }
 
-#ifdef WITH_LIBCORE
 /**
  * Initialize all timers.
  */
@@ -506,6 +359,8 @@ static void be_init_timer(be_options_t *main_opts)
 		LC_STOP_AND_RESET_TIMER(ra_timer.t_ssa);
 		LC_STOP_AND_RESET_TIMER(ra_timer.t_verify);
 		LC_STOP_AND_RESET_TIMER(ra_timer.t_other);
+
+		global_ra_timer = &ra_timer;
 	}
 }
 
@@ -531,313 +386,277 @@ static void be_init_timer(be_options_t *main_opts)
 				lc_timer_get_name(tmp), lc_timer_get_name(timer));                             \
 		timer = tmp;                                                                           \
 	}
-#else
-
-#define BE_TIMER_INIT(main_opts)
-#define BE_TIMER_PUSH(timer)
-#define BE_TIMER_POP(timer)
-
-#endif /* WITH_LIBCORE */
-
-enum {
-	STAT_TAG_FILE = 0,
-	STAT_TAG_TIME = 1,
-	STAT_TAG_IRG  = 2,
-	STAT_TAG_CLS  = 3,
-	STAT_TAG_LAST
-};
 
 /**
- * Performs chordal register allocation for each register class on given irg.
- *
- * @param bi  Backend irg object
- * @return Structure containing timer for the single phases or NULL if no timing requested.
+ * Perform things which need to be done per register class before spilling.
  */
-static be_ra_timer_t *be_ra_chordal_main(const be_irg_t *bi)
+static void pre_spill(post_spill_env_t *pse, const arch_register_class_t *cls)
 {
-	const be_main_env_t *main_env  = bi->main_env;
-	const arch_isa_t    *isa       = arch_env_get_isa(main_env->arch_env);
-	ir_graph            *irg       = bi->irg;
-	be_options_t        *main_opts = main_env->options;
-	int                   splitted = 0;
-	FILE                *stat_file = NULL;
-
-	char time_str[32];
-	char irg_name[128];
-	int j, m, line;
-	be_chordal_env_t chordal_env;
-	const char *stat_tags[STAT_TAG_LAST];
-
-	/* if we want to do some statistics, push the environment. */
-	if(strlen(stat_file_name) > 0 && (stat_file = fopen(stat_file_name, "at")) != NULL) {
-
-		/* initialize the statistics tags */
-		ir_snprintf(time_str, sizeof(time_str),"%u", time(NULL));
-		ir_snprintf(irg_name, sizeof(irg_name), "%F", irg);
-
-		stat_tags[STAT_TAG_FILE] = be_retrieve_dbg_info(get_entity_dbg_info(get_irg_entity(irg)), &line);
-		stat_tags[STAT_TAG_TIME] = time_str;
-		stat_tags[STAT_TAG_IRG]  = irg_name;
-		stat_tags[STAT_TAG_CLS]  = "<all>";
-
-		be_stat_ev_push(stat_tags, STAT_TAG_LAST, stat_file);
-	}
-
-	BE_TIMER_INIT(main_opts);
-	BE_TIMER_PUSH(ra_timer.t_other);
-	BE_TIMER_PUSH(ra_timer.t_prolog);
-
-	compute_doms(irg);
-
-	chordal_env.opts      = &options;
-	chordal_env.irg       = irg;
-	chordal_env.birg      = bi;
-	chordal_env.dom_front = be_compute_dominance_frontiers(irg);
-	chordal_env.exec_freq = bi->execfreqs;
-		/*compute_execfreq(irg, be_loop_weight);*/
-	chordal_env.lv        = be_liveness(irg);
-	FIRM_DBG_REGISTER(chordal_env.dbg, "firm.be.chordal");
-
-	obstack_init(&chordal_env.obst);
-
-	BE_TIMER_POP(ra_timer.t_prolog);
-
-	be_stat_ev("insns_before", count_insns(irg));
-
-	/* Perform the following for each register class. */
-	for (j = 0, m = arch_isa_get_n_reg_class(isa); j < m; ++j) {
-		node_stat_t node_stat;
-
-		chordal_env.cls           = arch_isa_get_reg_class(isa, j);
-		chordal_env.border_heads  = pmap_create();
-		chordal_env.ignore_colors = bitset_malloc(chordal_env.cls->n_regs);
-
-		stat_tags[STAT_TAG_CLS] = chordal_env.cls->name;
-
-		if(stat_file) {
-			be_stat_ev_push(stat_tags, STAT_TAG_LAST, stat_file);
-
-			/* perform some node statistics. */
-			node_stats(&chordal_env, &node_stat);
-			be_stat_ev("phis_before_spill", node_stat.n_phis);
-		}
-
-		/* put all ignore registers into the ignore register set. */
-		put_ignore_colors(&chordal_env);
-
-		BE_TIMER_PUSH(ra_timer.t_live);
-		be_liveness_recompute(chordal_env.lv);
-		BE_TIMER_POP(ra_timer.t_live);
-		dump(BE_CH_DUMP_LIVE, irg, chordal_env.cls, "-live", dump_ir_block_graph_sched);
-
-		be_pre_spill_prepare_constr(&chordal_env);
-		dump(BE_CH_DUMP_CONSTR, irg, chordal_env.cls, "-constr-pre", dump_ir_block_graph_sched);
-
-		BE_TIMER_PUSH(ra_timer.t_spill);
-
-		/* spilling */
-		switch(options.spill_method) {
-		case BE_CH_SPILL_MORGAN:
-			be_spill_morgan(&chordal_env);
-			break;
-		case BE_CH_SPILL_BELADY:
-			be_spill_belady(&chordal_env);
-			break;
-#ifdef WITH_ILP
-		case BE_CH_SPILL_REMAT:
-			be_spill_remat(&chordal_env);
-			break;
-#endif /* WITH_ILP */
-		default:
-			fprintf(stderr, "no valid spiller selected. falling back to belady\n");
-			be_spill_belady(&chordal_env);
-		}
-
-		BE_TIMER_POP(ra_timer.t_spill);
+	be_chordal_env_t    *chordal_env = &pse->cenv;
+	be_irg_t            *birg        = pse->birg;
+	ir_graph            *irg         = be_get_birg_irg(birg);
+	const be_main_env_t *main_env    = birg->main_env;
+	node_stat_t          node_stat;
+
+	pse->cls                   = cls;
+	chordal_env->cls           = cls;
+	chordal_env->border_heads  = pmap_create();
+	chordal_env->ignore_colors = bitset_malloc(chordal_env->cls->n_regs);
+
+	be_assure_liveness(birg);
+	be_liveness_assure_chk(be_get_birg_liveness(birg));
+	stat_ev_ctx_push_str("bechordal_cls", pse->cls->name);
+	stat_ev_do(node_stats(birg, pse->cls, &node_stat));
+	stat_ev_do(pse->pre_spill_cost = be_estimate_irg_costs(irg, main_env->arch_env, birg->exec_freq));
+	stat_ev_dbl("phis_before_spill", node_stat.n_phis);
+
+	/* put all ignore registers into the ignore register set. */
+	be_put_ignore_regs(birg, pse->cls, chordal_env->ignore_colors);
+
+	be_pre_spill_prepare_constr(chordal_env);
+	dump(BE_CH_DUMP_CONSTR, birg->irg, pse->cls, "-constr-pre", dump_ir_block_graph_sched);
+
+	stat_ev_ctx_pop("bechordal_cls");
+}
 
-		if(stat_file) {
-			node_stats(&chordal_env, &node_stat);
-			be_stat_ev("phis_after_spill", node_stat.n_phis);
-			be_stat_ev("mem_phis", node_stat.n_mem_phis);
-			be_stat_ev("reloads", node_stat.n_reloads);
-			be_stat_ev("spills", node_stat.n_spills);
+/**
+ * Perform things which need to be done per register class after spilling.
+ */
+static void post_spill(post_spill_env_t *pse, int iteration) {
+	be_chordal_env_t    *chordal_env = &pse->cenv;
+	be_irg_t            *birg        = pse->birg;
+	ir_graph            *irg         = birg->irg;
+	const be_main_env_t *main_env    = birg->main_env;
+	be_options_t        *main_opts   = main_env->options;
+	node_stat_t         node_stat;
+	int                 colors_n     = arch_register_class_n_regs(chordal_env->cls);
+	int             allocatable_regs = colors_n - be_put_ignore_regs(birg, chordal_env->cls, NULL);
+
+	/* some special classes contain only ignore regs, no work to be done */
+	if (allocatable_regs > 0) {
+
+		stat_ev_ctx_push_str("cls", pse->cls->name);
+		stat_ev_do(node_stats(birg, pse->cls, &node_stat));
+		stat_ev_dbl("phis_after_spill", node_stat.n_phis);
+		stat_ev_dbl("mem_phis", node_stat.n_mem_phis);
+		stat_ev_dbl("reloads", node_stat.n_reloads);
+		stat_ev_dbl("spills", node_stat.n_spills);
+		stat_ev_dbl("spillcosts", be_estimate_irg_costs(irg, main_env->arch_env, birg->exec_freq) - pse->pre_spill_cost);
+
+		/*
+			If we have a backend provided spiller, post spill is
+			called in a loop after spilling for each register class.
+			But we only need to fix stack nodes once in this case.
+		*/
+		if (iteration == 0) {
+			check_for_memory_operands(chordal_env);
+			be_abi_fix_stack_nodes(birg->abi);
 		}
 
-		DBG((chordal_env.dbg, LEVEL_1, "spill costs for %+F in regclass %s: %g\n",irg, chordal_env.cls->name, get_irg_spill_cost(&chordal_env)));
-
-		dump(BE_CH_DUMP_SPILL, irg, chordal_env.cls, "-spill", dump_ir_block_graph_sched);
-
-		check_for_memory_operands(&chordal_env);
-
-		be_abi_fix_stack_nodes(bi->abi, chordal_env.lv);
-
 		BE_TIMER_PUSH(ra_timer.t_verify);
 
 		/* verify schedule and register pressure */
-		if (options.vrfy_option == BE_CH_VRFY_WARN) {
-			be_verify_schedule(irg);
-			be_verify_register_pressure(chordal_env.birg, chordal_env.cls, irg);
+		if (chordal_env->opts->vrfy_option == BE_CH_VRFY_WARN) {
+			be_verify_schedule(birg);
+			be_verify_register_pressure(birg, pse->cls, irg);
 		}
-		else if (options.vrfy_option == BE_CH_VRFY_ASSERT) {
-			assert(be_verify_schedule(irg) && "Schedule verification failed");
-			assert(be_verify_register_pressure(chordal_env.birg, chordal_env.cls, irg)
+		else if (chordal_env->opts->vrfy_option == BE_CH_VRFY_ASSERT) {
+			assert(be_verify_schedule(birg) && "Schedule verification failed");
+			assert(be_verify_register_pressure(birg, pse->cls, irg)
 				&& "Register pressure verification failed");
 		}
 		BE_TIMER_POP(ra_timer.t_verify);
 
-		if (be_elr_split && ! splitted) {
-			extreme_liverange_splitting(&chordal_env);
-			splitted = 1;
-		}
-
-
 		/* Color the graph. */
 		BE_TIMER_PUSH(ra_timer.t_color);
-		be_ra_chordal_color(&chordal_env);
+		be_ra_chordal_color(chordal_env);
 		BE_TIMER_POP(ra_timer.t_color);
 
-		dump(BE_CH_DUMP_CONSTR, irg, chordal_env.cls, "-color", dump_ir_block_graph_sched);
+		dump(BE_CH_DUMP_CONSTR, irg, pse->cls, "-color", dump_ir_block_graph_sched);
 
 		/* Create the ifg with the selected flavor */
 		BE_TIMER_PUSH(ra_timer.t_ifg);
-		switch (options.ifg_flavor) {
-			default:
-				fprintf(stderr, "no valid ifg flavour selected. falling back to std\n");
-			case BE_CH_IFG_STD:
-			case BE_CH_IFG_FAST:
-				chordal_env.ifg = be_ifg_std_new(&chordal_env);
-				break;
-			case BE_CH_IFG_CLIQUE:
-				chordal_env.ifg = be_ifg_clique_new(&chordal_env);
-				break;
-			case BE_CH_IFG_POINTER:
-				chordal_env.ifg = be_ifg_pointer_new(&chordal_env);
-				break;
-			case BE_CH_IFG_LIST:
-				chordal_env.ifg = be_ifg_list_new(&chordal_env);
-				break;
-			case BE_CH_IFG_CHECK:
-				check_ifg_implementations(&chordal_env);
-				/* Build the interference graph. */
-				chordal_env.ifg = be_ifg_std_new(&chordal_env);
-				break;
-		}
+		chordal_env->ifg = be_create_ifg(chordal_env);
 		BE_TIMER_POP(ra_timer.t_ifg);
 
-		if(stat_file) {
+		{
 			be_ifg_stat_t stat;
-			be_ifg_stat(&chordal_env, &stat);
-			be_stat_ev("ifg_nodes", stat.n_nodes);
-			be_stat_ev("ifg_edges", stat.n_edges);
-			be_stat_ev("ifg_comps", stat.n_comps);
-		}
-
-		BE_TIMER_PUSH(ra_timer.t_verify);
-		if (options.vrfy_option != BE_CH_VRFY_OFF) {
-			//be_ra_chordal_check(&chordal_env);
-		}
 
-		BE_TIMER_POP(ra_timer.t_verify);
+			stat_ev_do(be_ifg_stat(birg, chordal_env->ifg, &stat));
+			stat_ev_dbl("ifg_nodes", stat.n_nodes);
+			stat_ev_dbl("ifg_edges", stat.n_edges);
+			stat_ev_dbl("ifg_comps", stat.n_comps);
 
-		if(stat_file) {
-			node_stats(&chordal_env, &node_stat);
-			be_stat_ev("perms_before_coal", node_stat.n_perms);
-			be_stat_ev("copies_before_coal", node_stat.n_copies);
+			stat_ev_do(node_stats(birg, pse->cls, &node_stat));
+			stat_ev_dbl("perms_before_coal", node_stat.n_perms);
+			stat_ev_dbl("copies_before_coal", node_stat.n_copies);
 		}
 
 		/* copy minimization */
 		BE_TIMER_PUSH(ra_timer.t_copymin);
-		co_driver(&chordal_env);
+		co_driver(chordal_env);
 		BE_TIMER_POP(ra_timer.t_copymin);
 
-		dump(BE_CH_DUMP_COPYMIN, irg, chordal_env.cls, "-copymin", dump_ir_block_graph_sched);
+		dump(BE_CH_DUMP_COPYMIN, irg, pse->cls, "-copymin", dump_ir_block_graph_sched);
 
-		BE_TIMER_PUSH(ra_timer.t_verify);
-
-		if (options.vrfy_option != BE_CH_VRFY_OFF) {
-			//be_ra_chordal_check(&chordal_env);
-		}
-
-		BE_TIMER_POP(ra_timer.t_verify);
 		BE_TIMER_PUSH(ra_timer.t_ssa);
 
 		/* ssa destruction */
-		be_ssa_destruction(&chordal_env);
+		stat_ev_ctx_push_str("berachordal_phase", "ssadestr");
+		be_ssa_destruction(chordal_env);
+		stat_ev_ctx_pop("berachordal_phase");
 
 		BE_TIMER_POP(ra_timer.t_ssa);
 
-		dump(BE_CH_DUMP_SSADESTR, irg, chordal_env.cls, "-ssadestr", dump_ir_block_graph_sched);
+		dump(BE_CH_DUMP_SSADESTR, irg, pse->cls, "-ssadestr", dump_ir_block_graph_sched);
 
 		BE_TIMER_PUSH(ra_timer.t_verify);
-		if (options.vrfy_option != BE_CH_VRFY_OFF) {
-			be_ssa_destruction_check(&chordal_env);
-			//be_ra_chordal_check(&chordal_env);
+		if (chordal_env->opts->vrfy_option != BE_CH_VRFY_OFF) {
+			be_ssa_destruction_check(chordal_env);
 		}
 		BE_TIMER_POP(ra_timer.t_verify);
 
-		be_ifg_free(chordal_env.ifg);
-		pmap_destroy(chordal_env.border_heads);
-		bitset_free(chordal_env.ignore_colors);
+		stat_ev_do(node_stats(birg, pse->cls, &node_stat));
+		stat_ev_dbl("perms_after_coal", node_stat.n_perms);
+		stat_ev_dbl("copies_after_coal", node_stat.n_copies);
+		stat_ev_ctx_pop("cls");
 
-		if(stat_file) {
-			node_stats(&chordal_env, &node_stat);
-			be_stat_ev("perms_after_coal", node_stat.n_perms);
-			be_stat_ev("copies_after_coal", node_stat.n_copies);
-		}
-
-		be_stat_ev_pop();
+		/* the ifg exists only if there are allocatable regs */
+		be_ifg_free(chordal_env->ifg);
 	}
 
-	BE_TIMER_PUSH(ra_timer.t_spillslots);
+	/* free some always allocated data structures */
+	pmap_destroy(chordal_env->border_heads);
+	bitset_free(chordal_env->ignore_colors);
+}
 
-	be_coalesce_spillslots(&chordal_env, coalesce_spill_slots);
-	dump(BE_CH_DUMP_SPILLSLOTS, irg, NULL, "-spillslots", dump_ir_block_graph_sched);
+/**
+ * Performs chordal register allocation for each register class on given irg.
+ *
+ * @param birg  Backend irg object
+ * @return Structure containing timer for the single phases or NULL if no timing requested.
+ */
+static void be_ra_chordal_main(be_irg_t *birg)
+{
+	const be_main_env_t *main_env  = birg->main_env;
+	const arch_isa_t    *isa       = arch_env_get_isa(main_env->arch_env);
+	ir_graph            *irg       = birg->irg;
+	be_options_t        *main_opts = main_env->options;
+	int                 j, m;
+	be_chordal_env_t    chordal_env;
+	struct obstack      obst;
 
-	BE_TIMER_POP(ra_timer.t_spillslots);
+	BE_TIMER_INIT(main_opts);
+	BE_TIMER_PUSH(ra_timer.t_other);
+	BE_TIMER_PUSH(ra_timer.t_prolog);
 
-	BE_TIMER_PUSH(ra_timer.t_verify);
+	be_assure_dom_front(birg);
+	be_assure_liveness(birg);
 
-	/* verify spillslots */
-	if (options.vrfy_option == BE_CH_VRFY_WARN) {
-		be_verify_spillslots(main_env->arch_env, irg);
-	}
-	else if (options.vrfy_option == BE_CH_VRFY_ASSERT) {
-		assert(be_verify_spillslots(main_env->arch_env, irg) && "Spillslot verification failed");
+	chordal_env.obst          = &obst;
+	chordal_env.opts          = &options;
+	chordal_env.irg           = irg;
+	chordal_env.birg          = birg;
+	chordal_env.border_heads  = NULL;
+	chordal_env.ifg           = NULL;
+	chordal_env.ignore_colors = NULL;
+
+	obstack_init(&obst);
+
+	BE_TIMER_POP(ra_timer.t_prolog);
+
+	be_stat_ev("insns_before", count_insns(irg));
+
+
+
+	if (! arch_code_generator_has_spiller(birg->cg)) {
+		/* use one of the generic spiller */
+
+		/* Perform the following for each register class. */
+		for (j = 0, m = arch_isa_get_n_reg_class(isa); j < m; ++j) {
+			post_spill_env_t pse;
+			const arch_register_class_t *cls
+				= arch_isa_get_reg_class(isa, j);
+
+			if(arch_register_class_flags(cls) & arch_register_class_flag_manual_ra)
+				continue;
+
+
+			memcpy(&pse.cenv, &chordal_env, sizeof(chordal_env));
+			pse.birg = birg;
+			pre_spill(&pse, cls);
+
+#if 0
+			/* this is a hack, TODO remove me later */
+			if(j == 2) {
+				be_do_stat_reg_pressure(birg);
+			}
+#endif
+
+			BE_TIMER_PUSH(ra_timer.t_spill);
+			be_do_spill(birg, cls);
+			BE_TIMER_POP(ra_timer.t_spill);
+
+			dump(BE_CH_DUMP_SPILL, irg, pse.cls, "-spill",
+			     dump_ir_block_graph_sched);
+
+			post_spill(&pse, 0);
+		}
+	} else {
+		post_spill_env_t *pse;
+
+		/* the backend has it's own spiller */
+		m = arch_isa_get_n_reg_class(isa);
+
+		pse = alloca(m * sizeof(pse[0]));
+
+		for (j = 0; j < m; ++j) {
+			memcpy(&pse[j].cenv, &chordal_env, sizeof(chordal_env));
+			pse[j].birg = birg;
+			pre_spill(&pse[j], pse[j].cls);
+		}
+
+		BE_TIMER_PUSH(ra_timer.t_spill);
+		arch_code_generator_spill(birg->cg, birg);
+		BE_TIMER_POP(ra_timer.t_spill);
+		dump(BE_CH_DUMP_SPILL, irg, NULL, "-spill", dump_ir_block_graph_sched);
+
+		for (j = 0; j < m; ++j) {
+			post_spill(&pse[j], j);
+		}
 	}
-	BE_TIMER_POP(ra_timer.t_verify);
 
-	BE_TIMER_PUSH(ra_timer.t_epilog);
 
-	dump(BE_CH_DUMP_LOWER, irg, NULL, "-spilloff", dump_ir_block_graph_sched);
+	be_verify_register_allocation(birg);
 
-	lower_nodes_after_ra(&chordal_env, options.lower_perm_opt & BE_CH_LOWER_PERM_COPY ? 1 : 0);
+	BE_TIMER_PUSH(ra_timer.t_epilog);
+	lower_nodes_after_ra(birg, options.lower_perm_opt & BE_CH_LOWER_PERM_COPY ? 1 : 0);
 	dump(BE_CH_DUMP_LOWER, irg, NULL, "-belower-after-ra", dump_ir_block_graph_sched);
 
-	obstack_free(&chordal_env.obst, NULL);
-	be_free_dominance_frontiers(chordal_env.dom_front);
-	be_liveness_free(chordal_env.lv);
-	//free_execfreq(chordal_env.exec_freq);
-
+	obstack_free(&obst, NULL);
+	be_liveness_invalidate(be_get_birg_liveness(birg));
 	BE_TIMER_POP(ra_timer.t_epilog);
+
 	BE_TIMER_POP(ra_timer.t_other);
 
 	be_stat_ev("insns_after", count_insns(irg));
-	be_stat_ev_pop();
-
-	if(stat_file)
-		fclose(stat_file);
 
-#ifdef WITH_LIBCORE
-	return main_opts->timing == BE_TIME_ON ? &ra_timer : NULL;
-#endif /* WITH_LIBCORE */
-	return NULL;
+	return;
 }
 
-const be_ra_t be_ra_chordal_allocator = {
-#ifdef WITH_LIBCORE
-	be_ra_chordal_register_options,
-#else
-	NULL,
-#endif
+static be_ra_t be_ra_chordal_allocator = {
 	be_ra_chordal_main,
 };
+
+void be_init_chordal_main(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_add_table(chordal_grp, be_chordal_options);
+
+	be_register_allocator("chordal", &be_ra_chordal_allocator);
+}
+
+BE_REGISTER_MODULE_CONSTRUCTOR(be_init_chordal_main);