-/**
- * @file tropt.c
+/*
+ * Copyright (C) 1995-2011 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.
*
- * Project: libFIRM
- * File name: ir/opt/tropt.c
- * Purpose: Optimize the type representation.
- * Author: Goetz Lindenmaier
- * Modified by:
- * Created: 20.4.2005
- * CVS-ID: $Id$
- * Copyright: (c) 2005 Universität Karlsruhe
- * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
*
- * Perform optimizations of the type representation.
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
*/
-#include <alloca.h>
+/**
+ * @file
+ * @brief Perform optimizations of the type representation.
+ * @date 20.4.2005
+ * @author Goetz Lindenmaier
+ * @version $Id$
+ */
+#include "config.h"
-#include "tropt.h"
+#include <assert.h>
+#include "iroptimize.h"
#include "irprog.h"
-#include "mangle.h"
-
-#include "tr_inheritance.h"
#include "irtypeinfo.h"
#include "irgwalk.h"
-#include "irsimpletype.h"
#include "trouts.h"
#include "ircons.h"
#include "irgmod.h"
-#include "irflag.h"
+#include "irflag_t.h"
+#include "xmalloc.h"
+#include "debug.h"
+#include "opt_init.h"
+
+DEBUG_ONLY(static firm_dbg_module_t *dbg;)
/* - statistics ---------------------------------------------- */
-static int n_casts_normalized = 0;
-static int n_casts_removed = 0;
-static int n_sels_concretized = 0;
+static size_t n_casts_normalized = 0;
+static size_t n_casts_removed = 0;
+static size_t n_sels_concretized = 0;
/* - Cast normalization. ------------------------------------- */
-static type *default_gen_pointer_type_to(type *tp);
+static ir_type *default_gen_pointer_type_to(ir_type *tp);
#define PTR_TYPE_SUFFIX "cc_ptr_tp" /* class cast pointer type. */
static ident *ptr_type_suffix = NULL;
static gen_pointer_type_to_func gen_pointer_type_to = default_gen_pointer_type_to;
-static type *default_gen_pointer_type_to(type *tp) {
- type *res = NULL;
- if (get_trouts_state() == outs_consistent) {
- if (get_type_n_pointertypes_to(tp) > 0) {
- res = get_type_pointertype_to(tp, 0);
- } else {
- ir_mode *mode = mode_P_data;
-
- if (is_Method_type(tp))
- mode = mode_P_code;
- res = new_type_pointer_mode(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode);
- /* Update trout for pointertypes, so we can use it in next call. */
- add_type_pointertype_to(tp, res);
- }
- } else {
- res = find_pointer_type_to_type(tp);
- if (res == firm_unknown_type)
- res = new_type_pointer_mode(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode_P_data);
- }
-
- return res;
+/**
+ * Find a pointer type to a given type.
+ * Uses and updates trouts if available.
+ */
+static ir_type *default_gen_pointer_type_to(ir_type *tp)
+{
+ ir_type *res = NULL;
+ if (get_trouts_state() == outs_consistent) {
+ if (get_type_n_pointertypes_to(tp) > 0) {
+ res = get_type_pointertype_to(tp, 0);
+ } else {
+ res = new_type_pointer(tp);
+ /* Update trout for pointer types, so we can use it in next call. */
+ add_type_pointertype_to(tp, res);
+ }
+ } else {
+ res = find_pointer_type_to_type(tp);
+ if (res == firm_unknown_type)
+ res = new_type_pointer(tp);
+ }
+
+ return res;
}
-/* Return a type that is a depth times pointer to type. */
-static type *pointerize_type(type *tp, int depth) {
- for (; depth > 0; --depth) {
- tp = gen_pointer_type_to(tp);
- }
- return tp;
+/** Return a type that is a depth times pointer to type. */
+static ir_type *pointerize_type(ir_type *tp, size_t depth)
+{
+ for (; depth > 0; --depth) {
+ tp = gen_pointer_type_to(tp);
+ }
+ return tp;
}
-static ir_node *normalize_values_type(type *totype, ir_node *pred) {
- type *fromtype = get_irn_typeinfo_type(pred);
- ir_node *new_cast = pred;
- int ref_depth = 0;
-
- if (totype == fromtype) return pred; /* Case for optimization! */
-
- while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
- totype = get_pointer_points_to_type(totype);
- fromtype = get_pointer_points_to_type(fromtype);
- ref_depth++;
- }
-
- if (!is_Class_type(totype)) return pred;
- if (!is_Class_type(fromtype)) return pred;
-
- if ((get_class_supertype_index(totype, fromtype) != -1) ||
- (get_class_supertype_index(fromtype, totype) != -1) ) {
- /* It's just what we want ... */
- return pred;
- }
-
- set_cur_block(get_nodes_block(pred));
-
- if (is_subclass_of(totype, fromtype)) {
- /* downcast */
- while (get_class_subtype_index(fromtype, totype) == -1) {
- /* Insert a cast to a subtype of fromtype. */
- type *new_type = NULL;
- ir_node *new_cast;
- int i, n_subtypes = get_class_n_subtypes(fromtype);
- for (i = 0; i < n_subtypes && !new_type; ++i) {
- type *new_sub = get_class_subtype(fromtype, i);
- if (is_superclass_of(new_sub, totype))
- new_type = new_sub;
- }
- assert(new_type);
- fromtype = new_type;
- new_type = pointerize_type(new_type, ref_depth);
- new_cast = new_Cast(pred, new_type);
- pred = new_cast;
- n_casts_normalized ++;
- set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
- if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
- }
- }
- else {
- assert(is_superclass_of(totype, fromtype));
- /* upcast */
- while (get_class_supertype_index(fromtype, totype) == -1) {
- /* Insert a cast to a supertype of fromtype. */
- type *new_type = NULL;
- int i, n_supertypes = get_class_n_supertypes(fromtype);
- for (i = 0; i < n_supertypes && !new_type; ++i) {
- type *new_super = get_class_supertype(fromtype, i);
- if (is_subclass_of(new_super, totype))
- new_type = new_super;
- }
- assert(new_type);
- fromtype = new_type;
- new_type = pointerize_type(new_type, ref_depth);
- new_cast = new_Cast(pred, new_type);
- pred = new_cast;
- n_casts_normalized ++;
- set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
- if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
- }
- }
- return new_cast;
+static ir_node *normalize_values_type(ir_type *totype, ir_node *pred)
+{
+ ir_type *fromtype = get_irn_typeinfo_type(pred);
+ ir_node *new_cast = pred;
+ ir_node *block;
+ size_t ref_depth = 0;
+
+ if (totype == fromtype) return pred; /* Case for optimization! */
+
+ while (is_Pointer_type(totype) && is_Pointer_type(fromtype)) {
+ totype = get_pointer_points_to_type(totype);
+ fromtype = get_pointer_points_to_type(fromtype);
+ ++ref_depth;
+ }
+
+ if (!is_Class_type(totype)) return pred;
+ if (!is_Class_type(fromtype)) return pred;
+
+ if ((get_class_supertype_index(totype, fromtype) != (size_t)-1) ||
+ (get_class_supertype_index(fromtype, totype) != (size_t)-1) ) {
+ /* It's just what we want ... */
+ return pred;
+ }
+
+ block = get_nodes_block(pred);
+
+ if (is_SubClass_of(totype, fromtype)) {
+ /* downcast */
+ while (get_class_subtype_index(fromtype, totype) == (size_t)-1) {
+ /* Insert a cast to a subtype of fromtype. */
+ ir_type *new_type = NULL;
+ ir_node *new_cast;
+ size_t i;
+ size_t n_subtypes = get_class_n_subtypes(fromtype);
+ for (i = 0; i < n_subtypes && !new_type; ++i) {
+ ir_type *new_sub = get_class_subtype(fromtype, i);
+ if (is_SuperClass_of(new_sub, totype))
+ new_type = new_sub;
+ }
+ assert(new_type);
+ fromtype = new_type;
+ new_type = pointerize_type(new_type, ref_depth);
+ new_cast = new_r_Cast(block, pred, new_type);
+ pred = new_cast;
+ ++n_casts_normalized;
+ set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
+ if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
+ }
+ } else {
+ assert(is_SuperClass_of(totype, fromtype));
+ /* upcast */
+ while (get_class_supertype_index(fromtype, totype) == (size_t)-1) {
+ /* Insert a cast to a supertype of fromtype. */
+ ir_type *new_type = NULL;
+ size_t i, n_supertypes = get_class_n_supertypes(fromtype);
+ for (i = 0; i < n_supertypes && !new_type; ++i) {
+ ir_type *new_super = get_class_supertype(fromtype, i);
+ if (is_SubClass_of(new_super, totype))
+ new_type = new_super;
+ }
+ assert(new_type);
+ fromtype = new_type;
+ new_type = pointerize_type(new_type, ref_depth);
+ new_cast = new_r_Cast(block, pred, new_type);
+ pred = new_cast;
+ ++n_casts_normalized;
+ set_irn_typeinfo_type(new_cast, new_type); /* keep type information up to date. */
+ if (get_trouts_state() != outs_none) add_type_cast(new_type, new_cast);
+ }
+ }
+ return new_cast;
}
-
-static void normalize_irn_class_cast(ir_node *n, void *env) {
- ir_node *res;
- if (get_irn_op(n) == op_Cast) {
- ir_node *pred = get_Cast_op(n);
- type *totype = get_Cast_type(n);
- res = normalize_values_type(totype, pred);
- set_Cast_op(n, res);
- } else if (get_irn_op(n) == op_Call) {
- int i, n_params = get_Call_n_params(n);
- type *tp = get_Call_type(n);
- for (i = 0; i < n_params; ++i) {
- res = normalize_values_type(get_method_param_type(tp, i), get_Call_param(n, i));
- set_Call_param(n, i, res);
- }
- }
+/**
+ * Post-Walker.
+ */
+static void normalize_irn_class_cast(ir_node *n, void *env)
+{
+ ir_node *res;
+ (void) env;
+ if (is_Cast(n)) {
+ ir_node *pred = get_Cast_op(n);
+ ir_type *totype = get_Cast_type(n);
+ res = normalize_values_type(totype, pred);
+ set_Cast_op(n, res);
+ } else if (is_Call(n)) {
+ size_t n_params = get_Call_n_params(n);
+ size_t i;
+ ir_type *tp = get_Call_type(n);
+ for (i = 0; i < n_params; ++i) {
+ res = normalize_values_type(get_method_param_type(tp, i), get_Call_param(n, i));
+ set_Call_param(n, i, res);
+ }
+ }
}
-static void pure_normalize_irg_class_casts(ir_graph *irg) {
- assert(get_irg_class_cast_state(irg) != ir_class_casts_any &&
- "Cannot normalize irregular casts.");
- if (get_irg_class_cast_state(irg) == ir_class_casts_normalized) {
- verify_irg_class_cast_state(irg);
- return;
- }
+static void pure_normalize_irg_class_casts(ir_graph *irg)
+{
+ assert(get_irg_class_cast_state(irg) != ir_class_casts_any &&
+ "Cannot normalize irregular casts.");
+ if (get_irg_class_cast_state(irg) == ir_class_casts_normalized) {
+ verify_irg_class_cast_state(irg);
+ return;
+ }
- irg_walk_graph(irg, NULL, normalize_irn_class_cast, NULL);
- set_irg_class_cast_state(irg, ir_class_casts_normalized);
+ irg_walk_graph(irg, NULL, normalize_irn_class_cast, NULL);
+ set_irg_class_cast_state(irg, ir_class_casts_normalized);
}
-void normalize_irg_class_casts(ir_graph *irg, gen_pointer_type_to_func gppt_fct) {
- assert(get_irp_typeinfo_state() == ir_typeinfo_consistent);
+void normalize_irg_class_casts(ir_graph *irg, gen_pointer_type_to_func gppt_fct)
+{
+ assert(get_irp_typeinfo_state() == ir_typeinfo_consistent);
- if (gppt_fct) gen_pointer_type_to = gppt_fct;
+ if (gppt_fct) gen_pointer_type_to = gppt_fct;
- if (!ptr_type_suffix)
- ptr_type_suffix = new_id_from_str(PTR_TYPE_SUFFIX);
+ if (!ptr_type_suffix)
+ ptr_type_suffix = new_id_from_str(PTR_TYPE_SUFFIX);
- pure_normalize_irg_class_casts(irg);
+ pure_normalize_irg_class_casts(irg);
- gen_pointer_type_to = default_gen_pointer_type_to;
+ gen_pointer_type_to = default_gen_pointer_type_to;
}
-void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct) {
- int i, n_irgs = get_irp_n_irgs();
- if (gppt_fct) gen_pointer_type_to = gppt_fct;
+void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct)
+{
+ size_t i, n;
+ if (gppt_fct) gen_pointer_type_to = gppt_fct;
- if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
- simple_analyse_types();
+#if 0
+ if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
+ simple_analyse_types();
+#endif
- for (i = 0; i < n_irgs; ++i) {
- pure_normalize_irg_class_casts(get_irp_irg(i));
- }
+ for (i = 0, n = get_irp_n_irgs(); i < n; ++i) {
+ ir_graph *irg = get_irp_irg(i);
+ pure_normalize_irg_class_casts(irg);
+ }
- set_irp_class_cast_state(ir_class_casts_normalized);
- gen_pointer_type_to = default_gen_pointer_type_to;
+ set_irp_class_cast_state(ir_class_casts_normalized);
+ gen_pointer_type_to = default_gen_pointer_type_to;
- if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
- printf(" Cast normalization: %d Casts inserted.\n", n_casts_normalized);
- }
+ DB((dbg, SET_LEVEL_1, " Cast normalization: %zu Casts inserted.\n", n_casts_normalized));
}
/* - Cast optimization. ------------------------------------------- */
-static void cancel_out_casts(ir_node *cast) {
- ir_node *orig, *pred = get_Cast_op(cast);
- type *tp_cast, *tp_pred, *tp_orig;
- int ref_depth = 0;
-
- if (get_irn_op(pred) != op_Cast) return;
- orig = get_Cast_op(pred);
-
- tp_cast = get_Cast_type(cast);
- tp_pred = get_Cast_type(pred);
- tp_orig = get_irn_typeinfo_type(orig);
-
- while (is_Pointer_type(tp_cast) &&
- is_Pointer_type(tp_pred) &&
- is_Pointer_type(tp_orig) ) {
- tp_cast = get_pointer_points_to_type(tp_cast);
- tp_pred = get_pointer_points_to_type(tp_pred);
- tp_orig = get_pointer_points_to_type(tp_orig);
- ref_depth++;
- }
-
- if (!is_Class_type(tp_cast)) return;
- if (!is_Class_type(tp_pred)) return;
- if (!is_Class_type(tp_orig)) return;
-
- if (is_subclass_of(tp_pred, tp_cast) && get_opt_suppress_downcast_optimization())
- return;
-
- if (tp_cast == tp_orig) {
- exchange(cast, orig);
- n_casts_removed += 2;
- return;
- }
-
- if (!(is_subclass_of (tp_cast, tp_orig) || is_subclass_of (tp_orig, tp_cast)))
- /* Avoid (B2)(A)(new B1()) --> (B2)(new B1()) */
- return;
-
- if ((is_subclass_of (tp_cast, tp_pred) && is_superclass_of(tp_pred, tp_orig)) ||
- (is_superclass_of(tp_cast, tp_pred) && is_subclass_of (tp_pred, tp_orig)) ) {
- set_Cast_op (cast, orig);
- n_casts_removed ++;
- }
+/**
+ * Optimizes Casts:
+ *
+ * (T1)(T2)x<T1> -> x<T1>
+ *
+ * (T3)(T2)x<T1> -> (T3)x<T1>
+ *
+ * if possible.
+ *
+ * @param cast the Cast node
+ *
+ * @return 1 if the cast was changed
+ */
+static int cancel_out_casts(ir_node *cast)
+{
+ ir_node *orig, *pred = get_Cast_op(cast);
+ ir_type *tp_cast, *tp_pred, *tp_orig;
+
+ if (!is_Cast(pred)) return 0;
+ orig = get_Cast_op(pred);
+
+ tp_cast = get_Cast_type(cast);
+ tp_pred = get_Cast_type(pred);
+ tp_orig = get_irn_typeinfo_type(orig);
+
+ while (is_Pointer_type(tp_cast) &&
+ is_Pointer_type(tp_pred) &&
+ is_Pointer_type(tp_orig) ) {
+ tp_cast = get_pointer_points_to_type(tp_cast);
+ tp_pred = get_pointer_points_to_type(tp_pred);
+ tp_orig = get_pointer_points_to_type(tp_orig);
+ }
+
+ if (!is_Class_type(tp_cast) || !is_Class_type(tp_pred) || !is_Class_type(tp_orig))
+ return 0;
+
+ if (is_SubClass_of(tp_pred, tp_cast) && get_opt_suppress_downcast_optimization())
+ return 0;
+
+ if (tp_cast == tp_orig) {
+ exchange(cast, orig);
+ n_casts_removed += 2;
+ return 1;
+ }
+
+ if (!(is_SubClass_of (tp_cast, tp_orig) || is_SubClass_of (tp_orig, tp_cast))) {
+ /* Avoid (B2)(A)(new B1()) --> (B2)(new B1())
+ * if B1 =!> B2 and B2 =!> B1
+ */
+ return 0;
+ }
+
+ if ((is_SubClass_of (tp_cast, tp_pred) && is_SuperClass_of(tp_pred, tp_orig)) ||
+ (is_SuperClass_of(tp_cast, tp_pred) && is_SubClass_of (tp_pred, tp_orig))) {
+ /* Cast --> Pred --> Orig */
+ set_Cast_op(cast, orig);
+ ++n_casts_removed;
+ return 1;
+ }
+ return 0;
}
-static void concretize_selected_entity(ir_node *sel) {
- ir_node *cast, *ptr = get_Sel_ptr(sel);
- type *orig_tp, *cast_tp;
- entity *new_ent, *sel_ent;
-
- sel_ent = get_Sel_entity(sel);
- cast = get_Sel_ptr(sel);
-
- while (get_irn_op(cast) == op_Cast) {
- cast_tp = get_Cast_type(cast);
- ptr = get_Cast_op(cast);
- orig_tp = get_irn_typeinfo_type(ptr);
-
- if (!is_Pointer_type(orig_tp)) return;
- if (!is_Pointer_type(cast_tp)) return;
- orig_tp = get_pointer_points_to_type(orig_tp);
- cast_tp = get_pointer_points_to_type(cast_tp);
- if (!is_Class_type(orig_tp)) return;
- if (!is_Class_type(cast_tp)) return;
-
- /* We only want to contretize, but not generalize. */
- if (!is_superclass_of(cast_tp, orig_tp)) return;
-
- /* Hmm, we are not properly typed. */
- if (get_class_member_index(cast_tp, sel_ent) == -1) return;
-
- new_ent = resolve_ent_polymorphy(orig_tp, sel_ent);
-
- /* New ent must be member of orig_tp. */
- if (get_class_member_index(orig_tp, new_ent) == -1) return;
-
- set_Sel_entity(sel, new_ent);
- set_Sel_ptr(sel, ptr);
- n_sels_concretized++;
-
- sel_ent = new_ent;
- cast = ptr;
- }
+/**
+ * Optimize Sel(Cast(type, ptr), ent) into Sel(ptr_type, ent_type)
+ *
+ * @param sel the Sel node
+ *
+ * @return 1 if Cast's where removed
+ */
+static int concretize_selected_entity(ir_node *sel)
+{
+ ir_node *cast, *ptr = get_Sel_ptr(sel);
+ ir_type *orig_tp, *cast_tp;
+ ir_entity *new_ent, *sel_ent;
+ int res = 0;
+
+ sel_ent = get_Sel_entity(sel);
+ cast = get_Sel_ptr(sel);
+
+ while (is_Cast(cast)) {
+ cast_tp = get_Cast_type(cast);
+ ptr = get_Cast_op(cast);
+ orig_tp = get_irn_typeinfo_type(ptr);
+
+ /* we handle only classes */
+ if (!is_Pointer_type(orig_tp)|| !is_Pointer_type(cast_tp))
+ return res;
+ orig_tp = get_pointer_points_to_type(orig_tp);
+ cast_tp = get_pointer_points_to_type(cast_tp);
+ if (!is_Class_type(orig_tp) || !is_Class_type(cast_tp))
+ return res;
+
+ /* We only want to concretize, but not generalize. */
+ if (!is_SuperClass_of(cast_tp, orig_tp))
+ return res;
+
+ /* The sel entity should be a member of the cast_tp, else
+ the graph was not properly typed. */
+ if (get_class_member_index(cast_tp, sel_ent) == (size_t)-1)
+ return res;
+
+ new_ent = resolve_ent_polymorphy(orig_tp, sel_ent);
+
+ /* New ent must be member of orig_tp. */
+ if (get_class_member_index(orig_tp, new_ent) == (size_t)-1)
+ return res;
+
+ /* all checks done, we can remove the Cast and update the Sel */
+ set_Sel_entity(sel, new_ent);
+ set_Sel_ptr(sel, ptr);
+ ++n_sels_concretized;
+
+ sel_ent = new_ent;
+ cast = ptr;
+ res = 1;
+ }
+ return res;
}
-static void concretize_Phi_type(ir_node *phi) {
- int i, n_preds = get_Phi_n_preds(phi);
- ir_node **pred = alloca(n_preds * sizeof(ir_node *));
- ir_node *new;
- type *totype, *fromtype;
-
- if (n_preds == 0) return;
- pred[0] = get_Phi_pred(phi, 0);
-
- if (get_irn_op(pred[0]) != op_Cast) return;
-
- if (!is_Cast_upcast(pred[0])) return;
-
- fromtype = get_irn_typeinfo_type(get_Cast_op(pred[0]));
- totype = get_Cast_type(pred[0]);
-
- pred[0] = get_Cast_op(pred[0]);
- for (i = 1; i < n_preds; ++i) {
- pred[i] = get_Phi_pred(phi, i);
- if (get_irn_op(pred[i]) != op_Cast) return;
- if (get_irn_typeinfo_type(get_Cast_op(pred[i])) != fromtype) return;
- pred[i] = get_Cast_op(pred[i]);
- }
-
- /* Transform Phi */
- set_cur_block(get_nodes_block(phi));
- new = new_Phi(n_preds, pred, get_irn_mode(phi));
- set_irn_typeinfo_type(new, fromtype);
- new = new_Cast(new, totype);
- set_irn_typeinfo_type(new, totype);
- exchange(phi, new);
+/**
+ * Move Casts of the same type through a Phi node, i.e.
+ * Phi(Cast(type, x_0), ..., Cast(type, x_n)) -> Cast(type, Phi(x_0, ..., x_n))
+ *
+ * @param phi the Phi node
+ *
+ * @return 1 if Cast's where moved
+ */
+static int concretize_Phi_type(ir_node *phi)
+{
+ int n_preds = get_Phi_n_preds(phi);
+ ir_node **pred = ALLOCAN(ir_node*, n_preds);
+ ir_node *nn, *blk;
+ ir_type *totype;
+ ir_type *fromtype;
+ int i;
+
+ if (n_preds == 0)
+ return 0;
+ pred[0] = get_Phi_pred(phi, 0);
+
+ if (!is_Cast(pred[0]))
+ return 0;
+
+ if (!is_Cast_upcast(pred[0]))
+ return 0;
+
+ fromtype = get_irn_typeinfo_type(get_Cast_op(pred[0]));
+ totype = get_Cast_type(pred[0]);
+
+ pred[0] = get_Cast_op(pred[0]);
+ for (i = 1; i < n_preds; ++i) {
+ pred[i] = get_Phi_pred(phi, i);
+ if (!is_Cast(pred[i]))
+ return 0;
+ if (get_irn_typeinfo_type(get_Cast_op(pred[i])) != fromtype)
+ return 0;
+ pred[i] = get_Cast_op(pred[i]);
+ }
+
+ /* Transform Phi */
+ blk = get_nodes_block(phi);
+ nn = new_r_Phi(blk, n_preds, pred, get_irn_mode(phi));
+ set_irn_typeinfo_type(nn, fromtype);
+ nn = new_r_Cast(blk, nn, totype);
+ set_irn_typeinfo_type(nn, totype);
+ exchange(phi, nn);
+ return 1;
}
-void remove_Cmp_Null_cast(ir_node *cmp) {
- ir_node *cast, *null, *new_null;
- int cast_pos, null_pos;
- type *fromtype;
-
- cast = get_Cmp_left(cmp);
- cast_pos = 0;
- if (get_irn_op(cast) != op_Cast) {
- null = cast;
- null_pos = cast_pos;
- cast = get_Cmp_right(cmp);
- cast_pos = 1;
- if (get_irn_op(cast) != op_Cast) return;
- } else {
- null = get_Cmp_right(cmp);
- null_pos = 1;
- }
-
- if (get_irn_op(null) != op_Const) return;
- if (!mode_is_reference(get_irn_mode(null))) return;
- if (get_Const_tarval(null) != get_mode_null(get_irn_mode(null))) return;
-
- /* Transform Cmp */
- set_irn_n(cmp, cast_pos, get_Cast_op(cast));
- fromtype = get_irn_typeinfo_type(get_Cast_op(cast));
- new_null = new_Const_type(get_Const_tarval(null), fromtype);
- set_irn_typeinfo_type(new_null, fromtype);
- set_irn_n(cmp, null_pos, new_null);
- n_casts_removed ++;
+/**
+ * Remove Casted null checks, i.e.
+ *
+ * Cmp(Cast(type, x_orig), NULL_type) -> Cmp(x_orig, NULL_orig)
+ *
+ * @param cmp the Cmp node
+ *
+ * @return 1 if Cast's where removed
+ */
+static int remove_Cmp_Null_cast(ir_node *cmp)
+{
+ ir_graph *irg;
+ ir_node *cast, *null, *new_null;
+ int cast_pos, null_pos;
+ ir_type *fromtype;
+ ir_mode *mode;
+
+ cast = get_Cmp_left(cmp);
+ if (!is_Cast(cast)) {
+ null = cast;
+ null_pos = 0;
+ cast = get_Cmp_right(cmp);
+ cast_pos = 1;
+ if (!is_Cast(cast))
+ return 0;
+ } else {
+ null = get_Cmp_right(cmp);
+ cast_pos = 0;
+ null_pos = 1;
+ }
+
+ if (! is_Const(null))
+ return 0;
+ mode = get_irn_mode(null);
+ if (!mode_is_reference(mode))
+ return 0;
+ if (get_Const_tarval(null) != get_mode_null(mode))
+ return 0;
+
+ /* Transform Cmp */
+ irg = get_irn_irg(cmp);
+ set_irn_n(cmp, cast_pos, get_Cast_op(cast));
+ fromtype = get_irn_typeinfo_type(get_Cast_op(cast));
+ new_null = new_r_Const(irg, get_Const_tarval(null));
+ set_irn_typeinfo_type(new_null, fromtype);
+ set_irn_n(cmp, null_pos, new_null);
+ ++n_casts_removed;
+ return 1;
}
-static void irn_optimize_class_cast(ir_node *n, void *env) {
- if (get_irn_op(n) == op_Cast)
- cancel_out_casts(n);
- else if (get_irn_op(n) == op_Sel)
- concretize_selected_entity(n);
- else if (get_irn_op(n) == op_Phi)
- concretize_Phi_type(n);
- else if (get_irn_op(n) == op_Cmp)
- remove_Cmp_Null_cast(n);
+/**
+ * Post-Walker: Optimize class casts (mostly by trying to remove them)
+ */
+static void irn_optimize_class_cast(ir_node *n, void *env)
+{
+ int *changed = (int*)env;
+
+ if (is_Cast(n))
+ *changed |= cancel_out_casts(n);
+ else if (is_Sel(n))
+ *changed |= concretize_selected_entity(n);
+ else if (is_Phi(n))
+ *changed |= concretize_Phi_type(n);
+ else if (is_Cmp(n))
+ *changed |= remove_Cmp_Null_cast(n);
}
-void optimize_class_casts(void) {
- int i, n_irgs = get_irp_n_irgs();
+void optimize_class_casts(void)
+{
+ int changed;
- if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
- simple_analyse_types();
+#if 0
+ if (get_irp_typeinfo_state() != ir_typeinfo_consistent)
+ simple_analyse_types();
+#endif
- all_irg_walk(NULL, irn_optimize_class_cast, NULL);
+ changed = 0;
+ all_irg_walk(NULL, irn_optimize_class_cast, &changed);
- set_trouts_inconsistent();
- for (i = 0; i < n_irgs; ++i)
- set_irg_outs_inconsistent(get_irp_irg(i));
+ if (changed) {
+ set_trouts_inconsistent();
+ }
+
+ DB((dbg, SET_LEVEL_1, " Cast optimization: %zu Casts removed, %zu Sels concretized.\n",
+ n_casts_removed, n_sels_concretized));
+}
- if (get_opt_optimize_class_casts_verbose() && get_firm_verbosity()) {
- printf(" Cast optimization: %d Casts removed, %d sels concretized.\n",
- n_casts_removed, n_sels_concretized);
- }
+void firm_init_class_casts_opt(void)
+{
+ FIRM_DBG_REGISTER(dbg, "firm.opt.tropt");
}
projects / libfirm / blobdiff