X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbespill.c;h=8719cb2c93de99d277fe213f776a4fe8f1d00d59;hb=ba873a5483697d4ff93e3980d7b6a1b5cbc491b5;hp=00d0dc340726d35257d41386120065bdbc1295f6;hpb=6165d2a9406fcc89959cc52a312eaff7bfd99c1b;p=libfirm

diff --git a/ir/be/bespill.c b/ir/be/bespill.c
index 00d0dc340..8719cb2c9 100644
--- a/ir/be/bespill.c
+++ b/ir/be/bespill.c
@@ -1,17 +1,37 @@
 /**
- * Author:      Daniel Grund
+ * Author:      Daniel Grund, Sebastian Hack
  * Date:		29.09.2005
  * Copyright:   (c) Universitaet Karlsruhe
  * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
  */
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 
 #include "pset.h"
 #include "irnode_t.h"
 #include "ircons_t.h"
+#include "iredges_t.h"
+#include "debug.h"
+#include "irgwalk.h"
 
 #include "besched.h"
 #include "bespill.h"
 #include "benode_t.h"
+#include "bechordal_t.h"
+
+typedef struct _reloader_t reloader_t;
+typedef struct _spill_info_t spill_info_t;
+
+struct _reloader_t {
+	reloader_t *next;
+	ir_node *reloader;
+};
+
+struct _spill_info_t {
+	ir_node *spilled_node;
+	reloader_t *reloaders;
+};
 
 typedef struct _spill_ctx_t {
 	ir_node *spilled;  /**< The spilled node. */
@@ -19,12 +39,53 @@ typedef struct _spill_ctx_t {
 	ir_node *spill;    /**< The spill itself. */
 } spill_ctx_t;
 
-int be_set_cmp_spillctx(const void *a, const void *b, size_t n) {
+struct _spill_env_t {
+	firm_dbg_module_t *dbg;
+	const arch_register_class_t *cls;
+	const be_chordal_env_t *chordal_env;
+	struct obstack obst;
+	set *spill_ctxs;
+	set *spills;				/**< all spill_info_t's, which must be placed */
+	pset *mem_phis;				/**< set of all special spilled phis. allocated and freed seperately */
+	decide_irn_t is_mem_phi;	/**< callback func to decide if a phi needs special spilling */
+	void *data;					/**< data passed to all callbacks */
+};
+
+static int cmp_spillctx(const void *a, const void *b, size_t n) {
 	const spill_ctx_t *p = a;
 	const spill_ctx_t *q = b;
 	return !(p->user == q->user && p->spilled == q->spilled);
 }
 
+static int cmp_spillinfo(const void *x, const void *y, size_t size) {
+	const spill_info_t *xx = x;
+	const spill_info_t *yy = y;
+	return ! (xx->spilled_node == yy->spilled_node);
+}
+
+spill_env_t *be_new_spill_env(firm_dbg_module_t *dbg,
+							  const be_chordal_env_t *chordal_env,
+							  decide_irn_t is_mem_phi, void *data) {
+
+	spill_env_t *env = malloc(sizeof(env[0]));
+	env->spill_ctxs  = new_set(cmp_spillctx, 1024);
+	env->spills      = new_set(cmp_spillinfo, 1024);
+	env->cls         = chordal_env->cls;
+	env->dbg         = dbg;
+	env->is_mem_phi  = is_mem_phi;
+	env->data        = data;
+	env->chordal_env = chordal_env;
+	obstack_init(&env->obst);
+	return env;
+}
+
+void be_delete_spill_env(spill_env_t *senv) {
+	del_set(senv->spill_ctxs);
+	del_set(senv->spills);
+	obstack_free(&senv->obst, NULL);
+	free(senv);
+}
+
 static spill_ctx_t *be_get_spill_ctx(set *sc, ir_node *to_spill, ir_node *ctx_irn) {
 	spill_ctx_t templ;
 
@@ -37,12 +98,12 @@ static spill_ctx_t *be_get_spill_ctx(set *sc, ir_node *to_spill, ir_node *ctx_ir
 
 static ir_node *be_spill_irn(spill_env_t *senv, ir_node *irn, ir_node *ctx_irn) {
 	spill_ctx_t *ctx;
-//	DBG((dbg, DBG_SPILL, "spill_irn %+F\n", irn));
+	DBG((senv->dbg, LEVEL_1, "%+F in ctx %+F\n", irn, ctx_irn));
 
 	ctx = be_get_spill_ctx(senv->spill_ctxs, irn, ctx_irn);
 	if(!ctx->spill) {
-		const be_main_env_t *env = senv->session->main_env;
-		ctx->spill = be_spill(env->node_factory, env->arch_env, irn);
+		const be_main_env_t *env = senv->chordal_env->main_env;
+		ctx->spill = be_spill(env->node_factory, env->arch_env, irn, ctx_irn);
 	}
 
 	return ctx->spill;
@@ -57,11 +118,11 @@ static ir_node *be_spill_irn(spill_env_t *senv, ir_node *irn, ir_node *ctx_irn)
 static ir_node *be_spill_phi(spill_env_t *senv, ir_node *phi, ir_node *ctx_irn) {
 	int i, n = get_irn_arity(phi);
 	ir_node **ins, *bl = get_nodes_block(phi);
-	ir_graph *irg = get_irn_irg(bl);
+	ir_graph *irg = senv->chordal_env->irg;
 	spill_ctx_t *ctx;
 
 	assert(is_Phi(phi));
-//	DBG((dbg, DBG_SPILL, "spill_phi %+F\n", phi));
+	DBG((senv->dbg, LEVEL_1, "%+F in ctx %+F\n", phi, ctx_irn));
 
 	/* search an existing spill for this context */
 	ctx = be_get_spill_ctx(senv->spill_ctxs, phi, ctx_irn);
@@ -72,7 +133,7 @@ static ir_node *be_spill_phi(spill_env_t *senv, ir_node *phi, ir_node *ctx_irn)
 		ins  = malloc(n * sizeof(ins[0]));
 		for(i=0; i<n; ++i)
 			ins[i] = new_r_Unknown(irg, mode_M);
-		ctx->spill = new_r_Phi(senv->session->irg, bl, n, ins, mode_M);
+		ctx->spill = new_r_Phi(senv->chordal_env->irg, bl, n, ins, mode_M);
 		free(ins);
 
 		/* re-wire the phiM */
@@ -91,7 +152,7 @@ static ir_node *be_spill_phi(spill_env_t *senv, ir_node *phi, ir_node *ctx_irn)
 	return ctx->spill;
 }
 
-ir_node *be_spill_node(spill_env_t *senv, ir_node *to_spill) {
+static ir_node *be_spill_node(spill_env_t *senv, ir_node *to_spill) {
 	ir_node *res;
 	if (pset_find_ptr(senv->mem_phis, to_spill))
 		res = be_spill_phi(senv, to_spill, to_spill);
@@ -101,13 +162,108 @@ ir_node *be_spill_node(spill_env_t *senv, ir_node *to_spill) {
 	return res;
 }
 
-void be_remove_spilled_phis(spill_env_t *senv) {
+static void phi_walker(ir_node *irn, void *env) {
+	spill_env_t *senv = env;
+	const arch_env_t *arch = senv->chordal_env->main_env->arch_env;
+
+	if (is_Phi(irn) && arch_irn_has_reg_class(arch, irn, 0, senv->cls)
+			&& senv->is_mem_phi(irn, senv->data)) {
+		DBG((senv->dbg, LEVEL_1, "  %+F\n", irn));
+		pset_insert_ptr(senv->mem_phis, irn);
+	}
+}
+
+void be_insert_spills_reloads(spill_env_t *senv, pset *reload_set) {
+	ir_graph *irg = senv->chordal_env->irg;
 	ir_node *irn;
-	/* remove all special phis form the irg and the schedule */
+	spill_info_t *si;
+	struct obstack ob;
+
+	obstack_init(&ob);
+
+	/* get all special spilled phis */
+	DBG((senv->dbg, LEVEL_1, "Mem-phis:\n"));
+	senv->mem_phis = pset_new_ptr_default();
+	irg_walk_graph(senv->chordal_env->irg, phi_walker, NULL, senv);
+
+	/* Add reloads for mem_phis */
+	/* BETTER: These reloads (1) should only be inserted, if they are really needed */
+	DBG((senv->dbg, LEVEL_1, "Reloads for mem-phis:\n"));
+	for(irn = pset_first(senv->mem_phis); irn; irn = pset_next(senv->mem_phis)) {
+		const ir_edge_t *e;
+		DBG((senv->dbg, LEVEL_1, " Mem-phi %+F\n", irn));
+		foreach_out_edge(irn, e) {
+			ir_node *user = e->src;
+			if (is_Phi(user) && !pset_find_ptr(senv->mem_phis, user)) {
+					ir_node *use_bl = get_nodes_block(user);
+					DBG((senv->dbg, LEVEL_1, " non-mem-phi user %+F\n", user));
+					be_add_reload_on_edge(senv, irn, use_bl, e->pos); /* (1) */
+			}
+		}
+	}
+
+	/* process each spilled node */
+	DBG((senv->dbg, LEVEL_1, "Insert spills and reloads:\n"));
+	for(si = set_first(senv->spills); si; si = set_next(senv->spills)) {
+		reloader_t *rld;
+		ir_node **reloads;
+		int n_reloads = 0;
+		ir_mode *mode = get_irn_mode(si->spilled_node);
+
+		/* go through all reloads for this spill */
+		for(rld = si->reloaders; rld; rld = rld->next) {
+			/* the spill for this reloader */
+			ir_node *spill   = be_spill_node(senv, si->spilled_node);
+
+			/* the reload */
+			ir_node *bl      = is_Block(rld->reloader) ? rld->reloader : get_nodes_block(rld->reloader);
+			ir_node *reload  = new_Reload(senv->chordal_env->main_env->node_factory,
+				senv->cls, irg, bl, mode, spill);
+
+			DBG((senv->dbg, LEVEL_1, " %+F of %+F before %+F\n", reload, si->spilled_node, rld->reloader));
+			if(reload_set)
+				pset_insert_ptr(reload_set, reload);
+
+			/* remember the reaload */
+			obstack_ptr_grow(&ob, reload);
+			sched_add_before(rld->reloader, reload);
+			n_reloads++;
+		}
+
+		assert(n_reloads > 0);
+		reloads = obstack_finish(&ob);
+		be_introduce_copies_ignore(senv->chordal_env->dom_front, si->spilled_node,
+				n_reloads, reloads, senv->mem_phis);
+		obstack_free(&ob, reloads);
+	}
+
+	obstack_free(&ob, NULL);
+
 	for(irn = pset_first(senv->mem_phis); irn; irn = pset_next(senv->mem_phis)) {
 		int i, n;
 		for(i = 0, n = get_irn_arity(irn); i < n; ++i)
-			set_irn_n(irn, i, new_r_Bad(senv->session->irg));
+			set_irn_n(irn, i, new_r_Bad(senv->chordal_env->irg));
 		sched_remove(irn);
 	}
+
+	del_pset(senv->mem_phis);
+}
+
+void be_add_reload(spill_env_t *senv, ir_node *to_spill, ir_node *before) {
+	spill_info_t templ, *res;
+	reloader_t *rel;
+
+	templ.spilled_node = to_spill;
+	templ.reloaders    = NULL;
+	res = set_insert(senv->spills, &templ, sizeof(templ), HASH_PTR(to_spill));
+
+	rel           = obstack_alloc(&senv->obst, sizeof(rel[0]));
+	rel->reloader = before;
+	rel->next     = res->reloaders;
+	res->reloaders = rel;
+}
+
+void be_add_reload_on_edge(spill_env_t *senv, ir_node *to_spill, ir_node *bl, int pos) {
+	ir_node *insert_bl = get_irn_arity(bl) == 1 ? sched_first(bl) : get_Block_cfgpred_block(bl, pos);
+	be_add_reload(senv, to_spill, insert_bl);
 }