X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbelive.c;h=c1537e10a4ef837aafa3ebda4b04465713f66df9;hb=441912f0da3d6e1acf5ef88fc38297f90bc774a3;hp=948bde7ccf7b124bbba911d3f5c2ce6f2feaa5a2;hpb=994bf742e802f53feb855dd14ed03ed934582693;p=libfirm diff --git a/ir/be/belive.c b/ir/be/belive.c index 948bde7cc..c1537e10a 100644 --- a/ir/be/belive.c +++ b/ir/be/belive.c @@ -1,35 +1,72 @@ +/* + * Copyright (C) 1995-2008 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. + * + * Licensees holding valid libFirm Professional Edition licenses may use + * this file in accordance with the libFirm Commercial License. + * Agreement provided with the Software. + * + * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE + * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE. + */ + /** - * Interblock liveness analysis. - * @author Sebastian Hack - * @date 6.12.2004 + * @file + * @brief Interblock liveness analysis. + * @author Sebastian Hack + * @date 06.12.2004 + * @version $Id$ */ #ifdef HAVE_CONFIG_H #include "config.h" #endif +/* statev is expensive here, only enable when needed */ +#define DISABLE_STATEV + #include "impl.h" #include "iredges_t.h" #include "irgwalk.h" #include "irprintf_t.h" #include "irbitset.h" #include "irdump_t.h" +#include "irnodeset.h" + +#include "dfs_t.h" +#include "absgraph.h" +#include "statev.h" #include "beutil.h" #include "belive_t.h" +#include "beirg_t.h" #include "besched_t.h" +#include "bemodule.h" -#define DBG_MODULE "firm.be.liveness" +DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;) -#define LV_STD_SIZE 128 +/* see comment in compute_liveness() */ +#define LV_COMPUTE_SORTED +#define LV_STD_SIZE 64 #define LV_USE_BINARY_SEARCH #undef LV_INTESIVE_CHECKS +void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc); + static INLINE int is_liveness_node(const ir_node *irn) { switch(get_irn_opcode(irn)) { case iro_Block: case iro_Bad: case iro_End: + case iro_Anchor: + case iro_NoMem: return 0; default:; } @@ -76,15 +113,6 @@ static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned if(n == 0) return 0; -#if 0 - if(idx < payload[0].u.node.idx) - return 0; - - if(idx > payload[n - 1].u.node.idx) - return n - 1; -#endif - - /* start a binary search for the requested node. */ while(lo < hi) { int md = lo + ((hi - lo) >> 1); unsigned md_idx = payload[md].u.node.idx; @@ -136,8 +164,11 @@ static INLINE unsigned _be_liveness_bsearch(struct _be_lv_info_t *arr, unsigned struct _be_lv_info_node_t *be_lv_get(const struct _be_lv_t *li, const ir_node *bl, const ir_node *irn) { - struct _be_lv_info_t *irn_live = phase_get_irn_data(&li->ph, bl); + struct _be_lv_info_t *irn_live; + struct _be_lv_info_node_t *res = NULL; + stat_ev_tim_push(); + irn_live = phase_get_irn_data(&li->ph, bl); if(irn_live) { unsigned idx = get_irn_idx(irn); @@ -145,14 +176,15 @@ struct _be_lv_info_node_t *be_lv_get(const struct _be_lv_t *li, const ir_node *b int pos = _be_liveness_bsearch(irn_live, idx); /* Get the record in question. 1 must be added, since the first record contains information about the array and must be skipped. */ - struct _be_lv_info_node_t *res = &irn_live[pos + 1].u.node; + struct _be_lv_info_node_t *rec = &irn_live[pos + 1].u.node; /* Check, if the irn is in deed in the array. */ - if(res->idx == idx) - return res; + if(rec->idx == idx) + res = rec; } + stat_ev_tim_pop("be_lv_get"); - return NULL; + return res; } static struct _be_lv_info_node_t *be_lv_get_or_set(struct _be_lv_t *li, ir_node *bl, ir_node *irn) @@ -174,13 +206,19 @@ static struct _be_lv_info_node_t *be_lv_get_or_set(struct _be_lv_t *li, ir_node unsigned n_size = irn_live[0].u.head.n_size; unsigned i; - if(n_members == n_size - 1) { - unsigned new_size = 2 * n_size * sizeof(irn_live[0]); - struct _be_lv_info_t *nw = phase_alloc(&li->ph, new_size); - memcpy(nw, irn_live, new_size); - nw[0].u.head.n_size = new_size; + if(n_members + 1 >= n_size) { + /* double the array size. Remember that the first entry is + * metadata about the array and not a real array element */ + unsigned old_size_bytes = (n_size + 1) * sizeof(irn_live[0]); + unsigned new_size = (2 * n_size) + 1; + size_t new_size_bytes = new_size * sizeof(irn_live[0]); + struct _be_lv_info_t *nw = phase_alloc(&li->ph, new_size_bytes); + memcpy(nw, irn_live, old_size_bytes); + memset(((char*) nw) + old_size_bytes, 0, + new_size_bytes - old_size_bytes); + nw[0].u.head.n_size = new_size - 1; irn_live = nw; - phase_set_irn_data(&li->ph, irn, nw); + phase_set_irn_data(&li->ph, bl, nw); } payload = &irn_live[1]; @@ -216,7 +254,8 @@ static struct _be_lv_info_node_t *be_lv_get_or_set(struct _be_lv_t *li, ir_node * Removes a node from the list of live variables of a block. * @return 1 if the node was live at that block, 0 if not. */ -static int be_lv_remove(struct _be_lv_t *li, ir_node *bl, ir_node *irn) +static int be_lv_remove(struct _be_lv_t *li, const ir_node *bl, + const ir_node *irn) { struct _be_lv_info_t *irn_live = phase_get_irn_data(&li->ph, bl); @@ -238,7 +277,7 @@ static int be_lv_remove(struct _be_lv_t *li, ir_node *bl, ir_node *irn) payload[n - 1].u.node.flags = 0; --irn_live[0].u.head.n_members; - DBG((li->dbg, LEVEL_3, "\tdeleting %+F from %+F at pos %d\n", irn, bl, pos)); + DBG((dbg, LEVEL_3, "\tdeleting %+F from %+F at pos %d\n", irn, bl, pos)); return 1; } } @@ -265,7 +304,7 @@ static void register_node(be_lv_t *lv, const ir_node *irn) static INLINE void mark_live_in(be_lv_t *lv, ir_node *block, ir_node *irn) { struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn); - DBG((lv->dbg, LEVEL_2, "marking %+F live in at %+F\n", irn, block)); + DBG((dbg, LEVEL_2, "marking %+F live in at %+F\n", irn, block)); n->flags |= be_lv_state_in; register_node(lv, irn); } @@ -276,7 +315,7 @@ static INLINE void mark_live_in(be_lv_t *lv, ir_node *block, ir_node *irn) static INLINE void mark_live_out(be_lv_t *lv, ir_node *block, ir_node *irn) { struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn); - DBG((lv->dbg, LEVEL_2, "marking %+F live out at %+F\n", irn, block)); + DBG((dbg, LEVEL_2, "marking %+F live out at %+F\n", irn, block)); n->flags |= be_lv_state_out | be_lv_state_end; register_node(lv, irn); } @@ -287,7 +326,7 @@ static INLINE void mark_live_out(be_lv_t *lv, ir_node *block, ir_node *irn) static INLINE void mark_live_end(be_lv_t *lv, ir_node *block, ir_node *irn) { struct _be_lv_info_node_t *n = be_lv_get_or_set(lv, block, irn); - DBG((lv->dbg, LEVEL_2, "marking %+F live end at %+F\n", irn, block)); + DBG((dbg, LEVEL_2, "marking %+F live end at %+F\n", irn, block)); n->flags |= be_lv_state_end; register_node(lv, irn); } @@ -332,6 +371,12 @@ struct _lv_walker_t { void *data; }; +typedef struct lv_remove_walker_t { + be_lv_t *lv; + const ir_node *irn; +} lv_remove_walker_t; + + /** * Liveness analysis for a value. * This functions is meant to be called by a firm walker, to compute the @@ -359,6 +404,9 @@ static void liveness_for_node(ir_node *irn, void *data) ir_node *use = edge->src; ir_node *use_block; + DBG((dbg, LEVEL_4, "%+F: use at %+F, pos %d in %+F\n", irn, use, edge->pos, get_block(use))); + assert(get_irn_n(use, edge->pos) == irn); + /* * If the usage is no data node, skip this use, since it does not * affect the liveness of the node. @@ -398,10 +446,8 @@ static void liveness_for_node(ir_node *irn, void *data) static void lv_remove_irn_walker(ir_node *bl, void *data) { - struct _lv_walker_t *w = data; - be_lv_t *lv = w->lv; - ir_node *irn = w->data; - be_lv_remove(lv, bl, irn); + lv_remove_walker_t *w = data; + be_lv_remove(w->lv, bl, w->irn); } static const char *lv_flags_to_str(unsigned flags) @@ -439,90 +485,178 @@ static void lv_dump_block(void *context, FILE *f, const ir_node *bl) } } -static void *lv_phase_data_init(phase_t *phase, ir_node *irn, void *old) +static void *lv_phase_data_init(ir_phase *phase, const ir_node *irn, void *old) { struct _be_lv_info_t *info = phase_alloc(phase, LV_STD_SIZE * sizeof(info[0])); + (void) irn; + (void) old; + memset(info, 0, LV_STD_SIZE * sizeof(info[0])); info[0].u.head.n_size = LV_STD_SIZE - 1; return info; } +static void collect_nodes(ir_node *irn, void *data) +{ + struct obstack *obst = data; + if (is_liveness_node(irn)) + obstack_ptr_grow(obst, irn); +} + +static int node_idx_cmp(const void *a, const void *b) +{ + const ir_node *p = *(ir_node **) a; + const ir_node *q = *(ir_node **) b; + int ia = get_irn_idx(p); + int ib = get_irn_idx(q); + return ia - ib; +} + static void compute_liveness(be_lv_t *lv) { + struct obstack obst; struct _lv_walker_t w; + ir_node **nodes; + int i, n; + + stat_ev_tim_push(); + obstack_init(&obst); + irg_walk_graph(lv->irg, collect_nodes, NULL, &obst); + n = obstack_object_size(&obst) / sizeof(nodes[0]); + nodes = obstack_finish(&obst); + + /* + * inserting the variables sorted by their ID is probably + * more efficient since the binary sorted set insertion + * will not need to move around the data. + * However, if sorting the variables a priori pays off + * needs to be checked, hence the define. + */ +#ifdef LV_COMPUTE_SORTED + qsort(nodes, n, sizeof(nodes[0]), node_idx_cmp); +#endif + w.lv = lv; - w.data = bitset_malloc(get_irg_last_idx(lv->irg)); - irg_walk_graph(lv->irg, liveness_for_node, NULL, &w); - bitset_free(w.data); + w.data = bitset_obstack_alloc(&obst, get_irg_last_idx(lv->irg)); + + for (i = 0; i < n; ++i) + liveness_for_node(nodes[i], &w); + + obstack_free(&obst, NULL); + register_hook(hook_node_info, &lv->hook_info); + stat_ev_tim_pop("be_lv_sets_cons"); +} + +void be_liveness_assure_sets(be_lv_t *lv) +{ + if (!lv->nodes) { + BE_TIMER_PUSH(t_live); + + lv->nodes = bitset_malloc(2 * get_irg_last_idx(lv->irg)); + phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init, NULL); + compute_liveness(lv); + /* be_live_chk_compare(lv, lv->lvc); */ + + BE_TIMER_POP(t_live); + } +} + +void be_liveness_assure_chk(be_lv_t *lv) +{ +#ifndef USE_LIVE_CHK + BE_TIMER_PUSH(t_verify); + be_liveness_assure_sets(lv); + BE_TIMER_POP(t_verify); +#else + (void) lv; +#endif +} + +void be_liveness_invalidate(be_lv_t *lv) +{ + if (lv && lv->nodes) { + unregister_hook(hook_node_info, &lv->hook_info); + phase_free(&lv->ph); + bitset_free(lv->nodes); + lv->nodes = NULL; + } } /* Compute the inter block liveness for a graph. */ -be_lv_t *be_liveness(ir_graph *irg) +be_lv_t *be_liveness(const be_irg_t *birg) { - be_lv_t *lv = xmalloc(sizeof(lv[0])); + be_lv_t *lv = XMALLOCZ(be_lv_t); - memset(lv, 0, sizeof(lv[0])); - FIRM_DBG_REGISTER(lv->dbg, DBG_MODULE); - lv->irg = irg; - lv->nodes = bitset_malloc(2 * get_irg_last_idx(irg)); + lv->irg = be_get_birg_irg(birg); + lv->birg = birg; +#ifdef USE_LIVE_CHK + lv->dfs = dfs_new(&absgraph_irg_cfg_succ, lv->irg); + lv->lvc = lv_chk_new(lv->irg, lv->dfs); +#endif lv->hook_info.context = lv; lv->hook_info.hook._hook_node_info = lv_dump_block; - register_hook(hook_node_info, &lv->hook_info); - phase_init(&lv->ph, "liveness", irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init); - compute_liveness(lv); return lv; } void be_liveness_recompute(be_lv_t *lv) { - unsigned last_idx = get_irg_last_idx(lv->irg); + unsigned last_idx; + + BE_TIMER_PUSH(t_live); + last_idx = get_irg_last_idx(lv->irg); if(last_idx >= bitset_size(lv->nodes)) { bitset_free(lv->nodes); lv->nodes = bitset_malloc(last_idx * 2); - } - - else + } else bitset_clear_all(lv->nodes); phase_free(&lv->ph); - phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init); + phase_init(&lv->ph, "liveness", lv->irg, PHASE_DEFAULT_GROWTH, lv_phase_data_init, NULL); compute_liveness(lv); + + BE_TIMER_POP(t_live); } void be_liveness_free(be_lv_t *lv) { - unregister_hook(hook_node_info, &lv->hook_info); - phase_free(&lv->ph); - bitset_free(lv->nodes); - free(lv); + be_liveness_invalidate(lv); +#ifdef USE_LIVE_CHK + lv_chk_free(lv->lvc); + dfs_free(lv->dfs); +#endif + xfree(lv); } -void be_liveness_remove(be_lv_t *lv, ir_node *irn) +void be_liveness_remove(be_lv_t *lv, const ir_node *irn) { - unsigned idx = get_irn_idx(irn); - struct _lv_walker_t w; + if (lv->nodes) { + unsigned idx = get_irn_idx(irn); + lv_remove_walker_t w; - /* - * Removes a single irn from the liveness information. - * Since an irn can only be live at blocks dominated by the block of its - * definition, we only have to process that dominance subtree. - */ - w.lv = lv; - w.data = irn; - dom_tree_walk(get_nodes_block(irn), lv_remove_irn_walker, NULL, &w); - if(idx <= bitset_size(lv->nodes)) - bitset_clear(lv->nodes, idx); + /* + * Removes a single irn from the liveness information. + * Since an irn can only be live at blocks dominated by the block of its + * definition, we only have to process that dominance subtree. + */ + w.lv = lv; + w.irn = irn; + dom_tree_walk(get_nodes_block(irn), lv_remove_irn_walker, NULL, &w); + if(idx < bitset_size(lv->nodes)) + bitset_clear(lv->nodes, idx); + } } void be_liveness_introduce(be_lv_t *lv, ir_node *irn) { - struct _lv_walker_t w; - w.lv = lv; - w.data = bitset_malloc(get_irg_last_idx(lv->irg)); - liveness_for_node(irn, &w); - bitset_free(w.data); + if (lv->nodes) { + struct _lv_walker_t w; + w.lv = lv; + w.data = bitset_malloc(get_irg_last_idx(lv->irg)); + liveness_for_node(irn, &w); + bitset_free(w.data); + } } void be_liveness_update(be_lv_t *lv, ir_node *irn) @@ -531,23 +665,6 @@ void be_liveness_update(be_lv_t *lv, ir_node *irn) be_liveness_introduce(lv, irn); } -static void lv_add_missing_walker(ir_node *irn, void *data) -{ - struct _lv_walker_t *w = data; - if(!is_Block(irn) && !bitset_contains_irn(w->lv->nodes, irn)) { - liveness_for_node(irn, w); - } -} - -void be_liveness_add_missing(be_lv_t *lv) -{ - struct _lv_walker_t w; - w.lv = lv; - w.data = bitset_malloc(get_irg_last_idx(lv->irg)); - irg_walk_graph(lv->irg, lv_add_missing_walker, NULL, &w); - bitset_free(w.data); -} - static void lv_check_walker(ir_node *bl, void *data) { struct _lv_walker_t *w = data; @@ -593,7 +710,7 @@ static void lv_check_walker(ir_node *bl, void *data) void be_liveness_check(be_lv_t *lv) { struct _lv_walker_t w; - be_lv_t *fresh = be_liveness(lv->irg); + be_lv_t *fresh = be_liveness(lv->birg); w.lv = lv; w.data = fresh; @@ -673,64 +790,137 @@ int be_check_dominance(ir_graph *irg) return !problem_found; } -pset *be_liveness_transfer(const arch_env_t *arch_env, const arch_register_class_t *cls, ir_node *irn, pset *live) +void be_liveness_transfer(const arch_register_class_t *cls, + ir_node *node, ir_nodeset_t *nodeset) { - int i, n; - FIRM_DBG_REGISTER(firm_dbg_module_t *dbg, DBG_MODULE); + int i, arity; - DEBUG_ONLY( - const ir_node *x; - DBG((dbg, LEVEL_1, "%+F\n", irn)); - for(x = pset_first(live); x; x = pset_next(live)) - DBG((dbg, LEVEL_1, "\tlive: %+F\n", x)); - ) + /* You should better break out of your loop when hitting the first phi + * function. */ + assert(!is_Phi(node) && "liveness_transfer produces invalid results for phi nodes"); - /* You should better break out of your loop when hitting the first phi function. */ - assert(!is_Phi(irn) && "liveness_transfer produces invalid results for phi nodes"); + if (get_irn_mode(node) == mode_T) { + const ir_edge_t *edge; - if(arch_irn_consider_in_reg_alloc(arch_env, cls, irn)) { - ir_node *del = pset_remove_ptr(live, irn); - assert(irn == del); + foreach_out_edge(node, edge) { + ir_node *proj = get_edge_src_irn(edge); + + if (arch_irn_consider_in_reg_alloc(cls, proj)) { + ir_nodeset_remove(nodeset, proj); + } + } + } else if (arch_irn_consider_in_reg_alloc(cls, node)) { + ir_nodeset_remove(nodeset, node); } - for(i = 0, n = get_irn_arity(irn); i < n; ++i) { - ir_node *op = get_irn_n(irn, i); + arity = get_irn_arity(node); + for (i = 0; i < arity; ++i) { + ir_node *op = get_irn_n(node, i); - if(arch_irn_consider_in_reg_alloc(arch_env, cls, op)) - pset_insert_ptr(live, op); + if (arch_irn_consider_in_reg_alloc(cls, op)) + ir_nodeset_insert(nodeset, op); } - - return live; } -pset *be_liveness_end_of_block(const be_lv_t *lv, const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *bl, pset *live) + + +void be_liveness_end_of_block(const be_lv_t *lv, + const arch_register_class_t *cls, + const ir_node *block, ir_nodeset_t *live) { int i; - be_lv_foreach(lv, bl, be_lv_state_end, i) { - ir_node *irn = be_lv_get_irn(lv, bl, i); - if(arch_irn_consider_in_reg_alloc(arch_env, cls, irn)) - pset_insert_ptr(live, irn); - } - return live; + assert(lv->nodes && "live sets must be computed"); + be_lv_foreach(lv, block, be_lv_state_end, i) { + ir_node *node = be_lv_get_irn(lv, block, i); + if (!arch_irn_consider_in_reg_alloc(cls, node)) + continue; + + ir_nodeset_insert(live, node); + } } -pset *be_liveness_nodes_live_at(const be_lv_t *lv, const arch_env_t *arch_env, const arch_register_class_t *cls, const ir_node *pos, pset *live) + + +void be_liveness_nodes_live_at(const be_lv_t *lv, + const arch_register_class_t *cls, + const ir_node *pos, ir_nodeset_t *live) { const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos); ir_node *irn; - be_liveness_end_of_block(lv, arch_env, cls, bl, live); + be_liveness_end_of_block(lv, cls, bl, live); sched_foreach_reverse(bl, irn) { /* * If we encounter the node we want to insert the Perm after, * exit immediately, so that this node is still live */ if(irn == pos) - return live; + return; + + be_liveness_transfer(cls, irn, live); + } +} + +static void collect_node(ir_node *irn, void *data) +{ + struct obstack *obst = data; + obstack_ptr_grow(obst, irn); +} + +void be_live_chk_compare(be_lv_t *lv, lv_chk_t *lvc) +{ + ir_graph *irg = lv->irg; + + struct obstack obst; + ir_node **nodes; + ir_node **blocks; + int i, j; - be_liveness_transfer(arch_env, cls, irn, live); + obstack_init(&obst); + + irg_block_walk_graph(irg, collect_node, NULL, &obst); + obstack_ptr_grow(&obst, NULL); + blocks = obstack_finish(&obst); + + irg_walk_graph(irg, collect_node, NULL, &obst); + obstack_ptr_grow(&obst, NULL); + nodes = obstack_finish(&obst); + + stat_ev_ctx_push("be_lv_chk_compare"); + for (j = 0; nodes[j]; ++j) { + ir_node *irn = nodes[j]; + for (i = 0; blocks[i]; ++i) { + ir_node *bl = blocks[i]; + + if (!is_Block(irn)) { + int lvr_in = be_is_live_in (lv, bl, irn); + int lvr_out = be_is_live_out(lv, bl, irn); + int lvr_end = be_is_live_end(lv, bl, irn); + + int lvc_in = lv_chk_bl_in (lvc, bl, irn); + int lvc_out = lv_chk_bl_out(lvc, bl, irn); + int lvc_end = lv_chk_bl_end(lvc, bl, irn); + + if (lvr_in - lvc_in != 0) + ir_fprintf(stderr, "live in info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_in, lvc_in); + + if (lvr_end - lvc_end != 0) + ir_fprintf(stderr, "live end info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_end, lvc_end); + + if (lvr_out - lvc_out != 0) + ir_fprintf(stderr, "live out info for %+F at %+F differs: nml: %d, chk: %d\n", irn, bl, lvr_out, lvc_out); + } + } } + stat_ev_ctx_pop("be_lv_chk_compare"); - return live; + obstack_free(&obst, NULL); } + +void be_init_live(void) +{ + FIRM_DBG_REGISTER(dbg, "firm.be.liveness"); +} + +BE_REGISTER_MODULE_CONSTRUCTOR(be_init_live);