X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fopt%2Ftropt.c;h=3716a70d27ff30476dd33ce478414d0cabd4b999;hb=9d3c8631459f431c313160dab5778e8a7b88dd92;hp=4dffe8c7ad4b4b552f73968d6234d2d7fa52b9d0;hpb=b51980e69f3fe79547d83fc13886d067ef188552;p=libfirm diff --git a/ir/opt/tropt.c b/ir/opt/tropt.c index 4dffe8c7a..3716a70d2 100644 --- a/ir/opt/tropt.c +++ b/ir/opt/tropt.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved. + * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved. * * This file is part of libFirm. * @@ -24,9 +24,7 @@ * @author Goetz Lindenmaier * @version $Id$ */ -#ifdef HAVE_CONFIG_H #include "config.h" -#endif #include @@ -34,12 +32,15 @@ #include "irprog.h" #include "irtypeinfo.h" #include "irgwalk.h" -#include "irsimpletype.h" #include "trouts.h" #include "ircons.h" #include "irgmod.h" #include "irflag_t.h" #include "xmalloc.h" +#include "debug.h" +#include "opt_init.h" + +DEBUG_ONLY(static firm_dbg_module_t *dbg;) /* - statistics ---------------------------------------------- */ @@ -59,171 +60,177 @@ static gen_pointer_type_to_func gen_pointer_type_to = default_gen_pointer_type_t * 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 { - ir_mode *mode = is_Method_type(tp) ? mode_P_code : mode_P_data; - - res = new_type_pointer(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode); - /* 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(mangle_u(get_type_ident(tp), ptr_type_suffix), tp, mode_P_data); - } - - return res; +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 ir_type *pointerize_type(ir_type *tp, int depth) { - for (; depth > 0; --depth) { - tp = gen_pointer_type_to(tp); - } - return tp; +static ir_type *pointerize_type(ir_type *tp, int depth) +{ + for (; depth > 0; --depth) { + tp = gen_pointer_type_to(tp); + } + return tp; } -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; - 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. */ - ir_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) { - 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_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. */ - ir_type *new_type = NULL; - int 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_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; + 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; + } + + 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. */ + ir_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) { + 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) == -1) { + /* Insert a cast to a supertype of fromtype. */ + ir_type *new_type = NULL; + int 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; - (void) env; - if (get_irn_op(n) == op_Cast) { - 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 (get_irn_op(n) == op_Call) { - int i, n_params = get_Call_n_params(n); - 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); - } - } +/** + * 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)) { + int i, n_params = get_Call_n_params(n); + 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) +{ + int i; + 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 = get_irp_n_irgs() - 1; i >= 0; --i) { + pure_normalize_irg_class_casts(get_irp_irg(i)); + } - 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: %d Casts inserted.\n", n_casts_normalized)); } @@ -238,189 +245,259 @@ void normalize_irp_class_casts(gen_pointer_type_to_func gppt_fct) { * (T3)(T2)x -> (T3)x * * if possible. + * + * @param cast the Cast node + * + * @return 1 if the cast was changed */ -static void cancel_out_casts(ir_node *cast) { - ir_node *orig, *pred = get_Cast_op(cast); - ir_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()) - * if B1 =!> B2 and B2 =!> 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)) ) { - /* Cast --> Pred --> Orig */ - set_Cast_op (cast, orig); - n_casts_removed ++; - } +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); - ir_type *orig_tp, *cast_tp; - ir_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 concretize, 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) == -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) == -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; - ir_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; - ir_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; } /** - * Post-Walker: + * Post-Walker: Optimize class casts (mostly by trying to remove them) */ -static void irn_optimize_class_cast(ir_node *n, void *env) { - (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); +static void irn_optimize_class_cast(ir_node *n, void *env) +{ + int *changed = 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 + + changed = 0; + all_irg_walk(NULL, irn_optimize_class_cast, &changed); - all_irg_walk(NULL, irn_optimize_class_cast, NULL); + if (changed) { + int i; - set_trouts_inconsistent(); - for (i = 0; i < n_irgs; ++i) - set_irg_outs_inconsistent(get_irp_irg(i)); + set_trouts_inconsistent(); + for (i = get_irp_n_irgs() - 1; i >= 0; --i) + set_irg_outs_inconsistent(get_irp_irg(i)); + } + + DB((dbg, SET_LEVEL_1, " Cast optimization: %d Casts removed, %d 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"); }