X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbessadestr.c;h=4ef0fae5e3148799d6b141888630b88703c961f1;hb=a4cf97f91f44fcb14d08f9295bcdef8da372a54d;hp=de7cbcf07586672d52c6cb12dbf171202d82125f;hpb=72b961b5b05ac239435b379ef340154c64134e25;p=libfirm

diff --git a/ir/be/bessadestr.c b/ir/be/bessadestr.c
index de7cbcf07..4ef0fae5e 100644
--- a/ir/be/bessadestr.c
+++ b/ir/be/bessadestr.c
@@ -16,6 +16,7 @@
 #include "irnode_t.h"
 #include "ircons_t.h"
 #include "iredges_t.h"
+#include "irgwalk.h"
 #include "irgmod.h"
 #include "irdump.h"
 #include "irprintf.h"
@@ -28,220 +29,297 @@
 #include "benode_t.h"
 #include "besched_t.h"
 
-static firm_dbg_module_t *dbg = NULL;
-#define DEBUG_LVL SET_LEVEL_0
-#undef DUMP_GRAPHS
+DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
 
-#define get_chordal_arch(ce) ((ce)->session_env->main_env->arch_env)
-#define get_reg(irn) arch_get_irn_register(get_chordal_arch(chordal_env), irn, 0)
-#define set_reg(irn, reg) arch_set_irn_register(get_chordal_arch(chordal_env), irn, 0, reg)
+#define get_chordal_arch(ce) ((ce)->birg->main_env->arch_env)
+#define get_reg(irn) arch_get_irn_register(get_chordal_arch(chordal_env), irn)
+#define set_reg(irn, reg) arch_set_irn_register(get_chordal_arch(chordal_env), irn, reg)
 
-#define is_Perm(irn)            (arch_irn_classify(arch_env, irn) == arch_irn_class_perm)
-#define get_reg_cls(irn)        (arch_get_irn_reg_class(arch_env, irn, arch_pos_make_out(0)))
+#define is_Perm(irn)            (arch_irn_class_is(arch_env, irn, perm))
+#define get_reg_cls(irn)        (arch_get_irn_reg_class(arch_env, irn, -1))
 #define is_curr_reg_class(irn)  (get_reg_cls(p) == chordal_env->cls)
 
-static void clear_link(ir_node *irn, void *data)
-{
-  set_irn_link(irn, NULL);
+static void clear_link(ir_node *irn, void *data) {
+	set_irn_link(irn, NULL);
 }
 
 /**
- * Build a list of phis of a block.
+ * For each block build a linked list of phis that
+ *  - are in that block
+ *  - have the current register class
+ * The list is rooted at get_irn_link(BB).
  */
-static void collect_phis(ir_node *irn, void *data)
-{
-  be_chordal_env_t *env = data;
-  if(is_Phi(irn) &&
-      arch_irn_has_reg_class(env->session_env->main_env->arch_env,
-        irn, arch_pos_make_out(0), env->cls)) {
-
-    ir_node *bl = get_nodes_block(irn);
-    set_irn_link(irn, get_irn_link(bl));
-    set_irn_link(bl, irn);
-  }
+static void collect_phis_walker(ir_node *irn, void *data) {
+	be_chordal_env_t *env = data;
+	if(is_Phi(irn) && chordal_has_class(env, irn)) {
+		ir_node *bl = get_nodes_block(irn);
+		set_irn_link(irn, get_irn_link(bl));
+		set_irn_link(bl, irn);
+	}
 }
 
 /**
- * Build a ring of phis for each block in the link field.
- * @param env The chordal env.
+ * This struct represents a Proj for a Perm.
+ * It records the argument in the Perm and the corresponding Proj of the
+ * Perm.
  */
-static INLINE void build_phi_rings(be_chordal_env_t *env)
-{
-  irg_walk_graph(env->session_env->irg, clear_link, collect_phis, env);
+typedef struct {
+	ir_node *arg;  /**< The phi argument to make the Proj for. */
+	int pos;       /**< The proj number the Proj will get.
+									 This also denotes the position of @p arg
+									 in the in array of the Perm. */
+	ir_node *proj; /**< The proj created for @p arg. */
+} perm_proj_t;
+
+static int cmp_perm_proj(const void *a, const void *b, size_t n) {
+	const perm_proj_t *p = a;
+	const perm_proj_t *q = b;
+	return !(p->arg == q->arg);
 }
 
-static int skip_cf_predicator(const ir_node *irn, void *data) {
-  be_chordal_env_t *chordal_env = data;
-  arch_env_t *ae = chordal_env->session_env->main_env->arch_env;
-  return arch_irn_classify(ae, irn) == arch_irn_class_branch;
-}
+/**
+ * Insert Perms in all predecessors of a block containing a phi
+ */
+static void insert_all_perms_walker(ir_node *bl, void *data) {
+	be_chordal_env_t *chordal_env = data;
+	pmap *perm_map = chordal_env->data;
+	ir_graph *irg = chordal_env->irg;
+	int i, n;
+
+	assert(is_Block(bl));
+
+	/* If the link flag is NULL, this block has no phis. */
+	if(!get_irn_link(bl))
+		return;
+
+	/* Look at all predecessors of the phi block */
+	for(i = 0, n = get_irn_arity(bl); i < n; ++i) {
+		ir_node *phi, *perm, *insert_after, **in;
+		perm_proj_t *pp;
+		set *arg_set     = new_set(cmp_perm_proj, chordal_env->cls->n_regs);
+		ir_node *pred_bl = get_Block_cfgpred_block(bl, i);
+		int n_projs      = 0;
+
+		assert(!pmap_contains(perm_map, pred_bl) && "Already permed that block");
+
+		/*
+		 * Note that all phis in the list are in the same
+		 * register class by construction.
+		 */
+		for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
+			perm_proj_t templ;
+			ir_node *arg     = get_irn_n(phi, i);
+			unsigned hash    = HASH_PTR(arg);
+
+			templ.arg  = arg;
+			pp         = set_find(arg_set, &templ, sizeof(templ), hash);
 
-static void insert_all_perms_walker(ir_node *bl, void *data)
-{
-  be_chordal_env_t *chordal_env = data;
-  pmap *perm_map = chordal_env->data;
-  ir_graph *irg = chordal_env->session_env->irg;
-  const be_node_factory_t *fact = chordal_env->session_env->main_env->node_factory;
-
-  /* Dummy targets for the projs */
-  ir_node *dummy = new_rd_Unknown(irg, mode_T);
-
-  assert(is_Block(bl));
-
-  /* If the link flag is NULL, this block has no phis. */
-  if(get_irn_link(bl)) {
-    int i, n;
-
-    /* Look at all predecessors of the phi block */
-    for(i = 0, n = get_irn_arity(bl); i < n; ++i) {
-      ir_node *pred_bl = get_Block_cfgpred_block(bl, i);
-      ir_node *phi, *perm, *insert_after;
-      ir_node **in;
-      int n_projs = 0;
-      pmap_entry *ent;
-      pmap *arg_map = pmap_create();
-
-      assert(!pmap_contains(perm_map, pred_bl) && "Already permed that block");
-
-      /*
-       * Note that all phis in the list are in the same register class
-       * by construction.
-       */
-      for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
-        ir_node *arg = get_irn_n(phi, i);
-        ir_node *proj = pmap_get(arg_map, arg);
-
-       	if(!proj && !is_live_in(bl, arg)) {
-	          proj = new_r_Proj(irg, pred_bl, dummy, get_irn_mode(arg), n_projs++);
-	          pmap_insert(arg_map, arg, proj);
-       	}
-
-		if (proj) {
-			assert(get_irn_mode(phi) == get_irn_mode(proj));
-	        set_irn_n(phi, i, proj);
+			/*
+			 * If a proj_perm_t entry has not been made in the argument set,
+			 * create one. The only restriction is, that the phi argument
+			 * may not be live in at the current block, since this argument
+			 * interferes with the phi and must thus not be member of a
+			 * Perm. A copy will be inserted for this argument alter on.
+			 */
+			if(!pp && !be_is_live_in(chordal_env->lv, bl, arg)) {
+				templ.pos = n_projs++;
+				set_insert(arg_set, &templ, sizeof(templ), hash);
+			}
 		}
-      }
-
-      in = malloc(n_projs * sizeof(in[0]));
-      pmap_foreach(arg_map, ent) {
-      	int proj_nr = get_Proj_proj(ent->value);
-        in[proj_nr] = ent->key;
-      }
-
-      perm = new_Perm(fact, chordal_env->cls, irg, pred_bl, n_projs, in);
-      insert_after = sched_skip(sched_last(pred_bl), 0, skip_cf_predicator, chordal_env);
-      sched_add_after(insert_after, perm);
-      exchange(dummy, perm);
-
-      /* register allocation is copied form former arguments to the projs (new arguments) */
-      pmap_foreach(arg_map, ent) {
-        DBG((dbg, LEVEL_2, "Copy register assignment %s from %+F to %+F\n", get_reg(ent->key)->name, ent->key, ent->value));
-        set_reg(ent->value, get_reg(ent->key));
-      }
-
-      free(in);
-      pmap_destroy(arg_map);
-
-      /* register in perm map */
-      pmap_insert(perm_map, pred_bl, perm);
-    }
-  }
-}
 
-static void insert_all_perms(be_chordal_env_t *chordal_env) {
-	DBG((dbg, LEVEL_1, "Placing perms...\n"));
-	irg_block_walk_graph(chordal_env->session_env->irg, insert_all_perms_walker, NULL, chordal_env);
+
+		if (n_projs) {
+			/*
+			 * Create a new Perm with the arguments just collected
+			 * above in the arg_set and insert it into the schedule.
+			 */
+			in = xmalloc(n_projs * sizeof(in[0]));
+			for(pp = set_first(arg_set); pp; pp = set_next(arg_set))
+				in[pp->pos] = pp->arg;
+
+			perm = be_new_Perm(chordal_env->cls, irg, pred_bl, n_projs, in);
+			free(in);
+			insert_after = sched_skip(sched_last(pred_bl), 0, sched_skip_cf_predicator, chordal_env->birg->main_env->arch_env);
+			sched_add_after(insert_after, perm);
+
+			/*
+			 * Make the Projs for the Perm and insert into schedule.
+			 * Register allocation is copied from the former phi
+			 * arguments to the projs (new phi arguments).
+			 */
+			insert_after = perm;
+			for(pp = set_first(arg_set); pp; pp = set_next(arg_set)) {
+				ir_node *proj = new_r_Proj(irg, pred_bl, perm, get_irn_mode(pp->arg), pp->pos);
+				pp->proj = proj;
+				assert(get_reg(pp->arg));
+				set_reg(proj, get_reg(pp->arg));
+				sched_add_after(insert_after, proj);
+				insert_after = proj;
+				DBG((dbg, LEVEL_2, "Copy register assignment %s from %+F to %+F\n", get_reg(pp->arg)->name, pp->arg, pp->proj));
+			}
+
+			/*
+			 * Set the phi nodes to their new arguments: The Projs of the Perm
+			 */
+			for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
+				perm_proj_t templ;
+
+				templ.arg = get_irn_n(phi, i);
+				pp        = set_find(arg_set, &templ, sizeof(templ), HASH_PTR(templ.arg));
+
+				/* If not found, it was an interfering argument */
+				if (pp)
+					set_irn_n(phi, i, pp->proj);
+			}
+
+			/* register in perm map */
+			pmap_insert(perm_map, pred_bl, perm);
+		}
+
+		del_set(arg_set);
+	}
 }
 
 #define is_pinned(irn) (get_irn_link(irn))
 #define get_pinning_block(irn) ((ir_node *)get_irn_link(irn))
 #define pin_irn(irn, lock) (set_irn_link(irn, lock))
 
-
 /**
- * Adjusts the register allocation for the phi-operands
- * by inserting perm nodes, if necessary.
- * @param phi The phi node to adjust operands for
+ * Adjusts the register allocation for the (new) phi-operands
+ * and insert duplicates iff necessary.
  */
-static void adjust_phi_arguments(be_chordal_env_t *chordal_env, ir_node *phi) {
-	int i, max;
-	ir_node *arg, *phi_block, *arg_block;
-	const be_main_session_env_t *session = chordal_env->session_env;
-	const arch_register_t *phi_reg, *arg_reg;
-	const arch_register_class_t *cls;
-
-	assert(is_Phi(phi) && "Can only handle phi-destruction :)");
-
-	phi_block = get_nodes_block(phi);
-	phi_reg = get_reg(phi);
-	cls = arch_get_irn_reg_class(get_chordal_arch(chordal_env), phi, arch_pos_make_out(0));
-
-	/* process all arguments of the phi */
-	for(i=0, max=get_irn_arity(phi); i<max; ++i) {
-		arg = get_irn_n(phi, i);
-		arg_block = get_Block_cfgpred_block(phi_block, i);
-		arg_reg = get_reg(arg);
-		assert(arg_reg && "Register must be set while placing perms");
-
-		DBG((dbg, LEVEL_1, "  for %+F(%s) -- %+F(%s)\n", phi, phi_reg->name, arg, arg_reg->name));
-
-		if(nodes_interfere(chordal_env, phi, arg)) {
-			/* Insert a duplicate in arguments block,
-			 * make it the new phi arg,
-			 * set its register,
-			 * insert it into schedule,
-			 * pin it
-			 */
-			ir_node *dupl = new_Copy(session->main_env->node_factory, cls, session->irg, arg_block, arg);
-			assert(get_irn_mode(phi) == get_irn_mode(dupl));
-			set_irn_n(phi, i, dupl);
-			set_reg(dupl, phi_reg);
-			sched_add_after(sched_skip(sched_last(arg_block), 0, skip_cf_predicator, chordal_env), dupl);
-			pin_irn(dupl, phi_block);
-			DBG((dbg, LEVEL_1, "    they do interfere: insert %+F(%s)\n", dupl, get_reg(dupl)->name));
-		} else {
-			/*
-			 * First check if there is a phi
-			 * - in the same block
-			 * - having arg at the current pos in its arg-list
-			 * - having the same color as arg
-			 *
-			 * If found, then pin the arg
-			 */
+static void	set_regs_or_place_dupls_walker(ir_node *bl, void *data) {
+	be_chordal_env_t *chordal_env = data;
+	ir_node *phi;
+
+	/* Consider all phis of this block */
+	for (phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
+		int i, max;
+		ir_node *arg, *phi_block, *arg_block;
+		const arch_register_t *phi_reg, *arg_reg;
+		const arch_register_class_t *cls;
+
+		assert(is_Phi(phi) && "Can only handle phi-destruction :)");
+
+		phi_block = get_nodes_block(phi);
+		phi_reg   = get_reg(phi);
+		cls       = arch_get_irn_reg_class(get_chordal_arch(chordal_env), phi, -1);
+
+		/* process all arguments of the phi */
+		for (i = 0, max = get_irn_arity(phi); i < max; ++i) {
+			arg       = get_irn_n(phi, i);
+			arg_block = get_Block_cfgpred_block(phi_block, i);
+			arg_reg   = get_reg(arg);
+
+			assert(arg_reg && "Register must be set while placing perms");
+
+			DBG((dbg, LEVEL_1, "  for %+F(%s) -- %+F(%s)\n", phi, phi_reg->name, arg, arg_reg->name));
+
+			if(values_interfere(chordal_env->lv, phi, arg)) {
+				/*
+					Insert a duplicate in arguments block,
+					make it the new phi arg,
+					set its register,
+					insert it into schedule,
+					pin it
+				*/
+				ir_node *dupl  = be_new_Copy(cls, chordal_env->irg, arg_block, arg);
+
+				/* this is commented out because it will fail in case of unknown float */
+#if 0
+				ir_mode *m_phi = get_irn_mode(phi), *m_dupl = get_irn_mode(dupl);
+
+				/*
+					Conv signed <-> unsigned is killed on ia32
+					check for: (both int OR both float) AND equal mode sizes
+				*/
+				assert(((mode_is_int(m_phi) && mode_is_int(m_dupl)) ||
+					(mode_is_float(m_phi) && mode_is_float(m_dupl))) &&
+					(get_mode_size_bits(m_phi) == get_mode_size_bits(m_dupl)));
+#endif /* if 0 */
+
+				set_irn_n(phi, i, dupl);
+				set_reg(dupl, phi_reg);
+				sched_add_after(sched_skip(sched_last(arg_block), 0, sched_skip_cf_predicator, chordal_env->birg->main_env->arch_env), dupl);
+				pin_irn(dupl, phi_block);
+				DBG((dbg, LEVEL_1, "    they do interfere: insert %+F(%s)\n", dupl, get_reg(dupl)->name));
+				continue; /* with next argument */
+			}
+
+			if (phi_reg == arg_reg) {
+				/* Phi and arg have the same register, so pin and continue */
+				pin_irn(arg, phi_block);
+				DBG((dbg, LEVEL_1, "      arg has same reg: pin %+F(%s)\n", arg, get_reg(arg)->name));
+				continue;
+			}
+
 			DBG((dbg, LEVEL_1, "    they do not interfere\n"));
 			assert(is_Proj(arg));
-			if (!is_pinned(arg)) {
+			/*
+				First check if there is an other phi
+				- in the same block
+				- having arg at the current pos in its arg-list
+				- having the same color as arg
+
+				If found, then pin the arg (for that phi)
+			*/
+			if (! is_pinned(arg)) {
 				ir_node *other_phi;
+
 				DBG((dbg, LEVEL_1, "      searching for phi with same arg having args register\n"));
+
 				for(other_phi = get_irn_link(phi_block); other_phi; other_phi = get_irn_link(other_phi)) {
-					assert(is_Phi(other_phi) && get_nodes_block(phi) == get_nodes_block(other_phi) && "link fields are screwed up");
+
+					assert(is_Phi(other_phi)                               &&
+						get_nodes_block(phi) == get_nodes_block(other_phi) &&
+						"link fields are screwed up");
+
 					if (get_irn_n(other_phi, i) == arg && get_reg(other_phi) == arg_reg) {
 						DBG((dbg, LEVEL_1, "        found %+F(%s)\n", other_phi, get_reg(other_phi)->name));
 						pin_irn(arg, phi_block);
+						break;
 					}
 				}
 			}
 
 			if (is_pinned(arg)) {
-				/* Insert a duplicate of the original value in arguments block,
-				 * make it the new phi arg,
-				 * set its register,
-				 * insert it into schedule,
-				 * pin it
-				 */
-				ir_node *perm = get_Proj_pred(arg);
-				ir_node *orig_val = get_irn_n(perm, get_Proj_proj(arg));
-				ir_node *dupl = new_Copy(session->main_env->node_factory, cls, session->irg, arg_block, orig_val);
-				assert(get_irn_mode(phi) == get_irn_mode(dupl));
+				/*
+					Insert a duplicate of the original value in arguments block,
+					make it the new phi arg,
+					set its register,
+					insert it into schedule,
+					pin it
+				*/
+				ir_node *perm     = get_Proj_pred(arg);
+				ir_node *dupl     = be_new_Copy(cls, chordal_env->irg, arg_block, arg);
+				ir_node *ins;
+
+				/* this is commented out because it will fail in case of unknown float */
+#if 0
+				ir_mode *m_phi    = get_irn_mode(phi);
+				ir_mode *m_dupl   = get_irn_mode(dupl);
+
+				/*
+					Conv signed <-> unsigned is killed on ia32
+					check for: (both int OR both float) AND equal mode sizes
+				*/
+				assert(((mode_is_int(m_phi) && mode_is_int(m_dupl)) ||
+					(mode_is_float(m_phi) && mode_is_float(m_dupl))) &&
+					(get_mode_size_bits(m_phi) == get_mode_size_bits(m_dupl)));
+#endif /* if 0 */
+
 				set_irn_n(phi, i, dupl);
 				set_reg(dupl, phi_reg);
-				sched_add_before(perm, dupl);
+				/* skip the Perm's Projs and insert the copies behind. */
+				for(ins = sched_next(perm); is_Proj(ins); ins = sched_next(ins));
+				sched_add_before(ins, dupl);
 				pin_irn(dupl, phi_block);
 				DBG((dbg, LEVEL_1, "      arg is pinned: insert %+F(%s)\n", dupl, get_reg(dupl)->name));
 			} else {
-				/* No other phi has the same color (else arg would be pinned),
-				 * so just set the register and pin
-				 */
+				/*
+					No other phi has the same color (else arg would have been pinned),
+					so just set the register and pin
+				*/
 				set_reg(arg, phi_reg);
 				pin_irn(arg, phi_block);
 				DBG((dbg, LEVEL_1, "      arg is not pinned: so pin %+F(%s)\n", arg, get_reg(arg)->name));
@@ -250,64 +328,54 @@ static void adjust_phi_arguments(be_chordal_env_t *chordal_env, ir_node *phi) {
 	}
 }
 
-static void	set_regs_or_place_dupls_walker(ir_node *bl, void *data) {
-	be_chordal_env_t *chordal_env = data;
-	ir_node *phi;
-
-	for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi))
-		adjust_phi_arguments(chordal_env, phi);
-}
-
-static void	set_regs_or_place_dupls(be_chordal_env_t *chordal_env)
-{
-	DBG((dbg, LEVEL_1, "Setting regs and placing dupls...\n"));
-	irg_block_walk_graph(chordal_env->session_env->irg,
-		set_regs_or_place_dupls_walker, NULL, chordal_env);
-}
-
-
 void be_ssa_destruction(be_chordal_env_t *chordal_env) {
 	pmap *perm_map = pmap_create();
-	ir_graph *irg = chordal_env->session_env->irg;
+	ir_graph *irg  = chordal_env->irg;
 
-	dbg = firm_dbg_register("ir.be.ssadestr");
-	firm_dbg_set_mask(dbg, DEBUG_LVL);
+	FIRM_DBG_REGISTER(dbg, "ir.be.ssadestr");
 
 	/* create a map for fast lookup of perms: block --> perm */
 	chordal_env->data = perm_map;
+	irg_walk_graph(irg, clear_link, collect_phis_walker, chordal_env);
 
-	build_phi_rings(chordal_env);
-	insert_all_perms(chordal_env);
-#ifdef DUMP_GRAPHS
-	dump_ir_block_graph_sched(irg, "-ssa_destr_perms_placed");
-#endif
-	set_regs_or_place_dupls(chordal_env);
-#ifdef DUMP_GRAPHS
-	dump_ir_block_graph_sched(irg, "-ssa_destr_regs_set");
-#endif
+	DBG((dbg, LEVEL_1, "Placing perms...\n"));
+	irg_block_walk_graph(irg, insert_all_perms_walker, NULL, chordal_env);
+
+	if (chordal_env->opts->dump_flags & BE_CH_DUMP_SSADESTR)
+		be_dump(irg, "-ssa_destr_perms_placed", dump_ir_block_graph_sched);
+
+	be_liveness_recompute(chordal_env->lv);
+
+	DBG((dbg, LEVEL_1, "Setting regs and placing dupls...\n"));
+	irg_block_walk_graph(irg, set_regs_or_place_dupls_walker, NULL, chordal_env);
+
+	if (chordal_env->opts->dump_flags & BE_CH_DUMP_SSADESTR)
+		be_dump(irg, "-ssa_destr_regs_set", dump_ir_block_graph_sched);
 
 	pmap_destroy(perm_map);
 }
 
-static void ssa_destruction_check_walker(ir_node *bl, void *data)
-{
+static void ssa_destruction_check_walker(ir_node *bl, void *data) {
 	be_chordal_env_t *chordal_env = data;
 	ir_node *phi;
 	int i, max;
 
-	for(phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
+	for (phi = get_irn_link(bl); phi; phi = get_irn_link(phi)) {
 		const arch_register_t *phi_reg, *arg_reg;
 
 		phi_reg = get_reg(phi);
 		/* iterate over all args of phi */
-		for(i=0, max=get_irn_arity(phi); i<max; ++i) {
+		for (i = 0, max = get_irn_arity(phi); i < max; ++i) {
 			ir_node *arg = get_irn_n(phi, i);
+
 			arg_reg = get_reg(arg);
-			if(phi_reg != arg_reg) {
+
+			if (phi_reg != arg_reg) {
 				DBG((dbg, 0, "Error: Registers of %+F and %+F differ: %s %s\n", phi, arg, phi_reg->name, arg_reg->name));
 				assert(0);
 			}
-			if(!is_pinned(arg)) {
+
+			if (! is_pinned(arg)) {
 				DBG((dbg, 0, "Warning: Phi argument %+F is not pinned.\n", arg));
 				assert(0);
 			}
@@ -316,5 +384,5 @@ static void ssa_destruction_check_walker(ir_node *bl, void *data)
 }
 
 void be_ssa_destruction_check(be_chordal_env_t *chordal_env) {
-	irg_block_walk_graph(chordal_env->session_env->irg, ssa_destruction_check_walker, NULL, chordal_env);
+	irg_block_walk_graph(chordal_env->irg, ssa_destruction_check_walker, NULL, chordal_env);
 }