X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbespill.h;h=018f52f1e3d94024598b596691ca44ba5c354e43;hb=44d51ff21a4a48494fd8e42dd10f5b489b4fca78;hp=92e6a9a837a1555b04ad5997cb17845b8ae9fbc0;hpb=b3a557ce967915e127eca5460196b4eb4c59718c;p=libfirm diff --git a/ir/be/bespill.h b/ir/be/bespill.h index 92e6a9a83..018f52f1e 100644 --- a/ir/be/bespill.h +++ b/ir/be/bespill.h @@ -1,54 +1,175 @@ -/** - * Author: Daniel Grund, Sebastian Hack - * Date: 29.09.2005 - * Copyright: (c) Universitaet Karlsruhe - * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE. +/* + * 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. */ -#ifndef BESPILL_H_ -#define BESPILL_H_ +/** + * @file + * @brief higher level abstraction for the creation of spill and reload + * instructions and rematerialisation of values. + * @author Daniel Grund, Sebastian Hack, Matthias Braun + * @date 29.09.2005 + * @version $Id$ + */ +#ifndef FIRM_BE_BESPILL_H +#define FIRM_BE_BESPILL_H #include "firm_types.h" -#include "set.h" -#include "pset.h" #include "debug.h" -#include "bechordal.h" -#include "be_t.h" - #include "bearch.h" +#include "beirg.h" -typedef struct _spill_env_t spill_env_t; -typedef int(*decide_irn_t)(const ir_node*, void*); +typedef struct spill_env_t spill_env_t; /** * Creates a new spill environment. - * - * @param chordal - * @param is_mem_phi a function that evaluates a Phi node - * @param data context parameter for the is_mem_phi function */ -spill_env_t *be_new_spill_env(const be_chordal_env_t *chordal, decide_irn_t is_mem_phi, void *data); +spill_env_t *be_new_spill_env(be_irg_t *birg); /** * Deletes a spill environment. */ void be_delete_spill_env(spill_env_t *senv); -void be_add_reload(spill_env_t *senv, ir_node *to_spill, ir_node *before); +/** + * Return the last control flow node of a block. + */ +ir_node *be_get_end_of_block_insertion_point(const ir_node *block); + +/** + * Marks a point until which a node must be spilled. + */ +void be_add_spill(spill_env_t *senv, ir_node *to_spill, ir_node *after); + +/** + * Inserts a new entry into the list of reloads to place (the real nodes will + * be created when be_insert_spills_reloads is run). You don't have to + * explicitly create spill nodes, they will be created automatically after + * the definition of a value as soon as a reload is created. (we should add a + * possibility for explicit spill placement in the future) + * + * @param senv The spill environment + * @param to_spill The node which is about to be spilled + * @param before The node before the reload should be added + * @param reload_cls The register class the reloaded value will be put into + * @param allow_remat Set to 1 if the node may be rematerialized instead of + * reloaded + */ +void be_add_reload(spill_env_t *senv, ir_node *to_spill, ir_node *before, + const arch_register_class_t *reload_cls, int allow_remat); + +void be_add_reload2(spill_env_t *senv, ir_node *to_spill, ir_node *before, ir_node *can_spill_after, + const arch_register_class_t *reload_cls, int allow_remat); + +/** + * Add a reload at the end of a block. + * Similar to be_add_reload_on_edge(). + */ +void be_add_reload_at_end(spill_env_t *env, ir_node *to_spill, const ir_node *block, + const arch_register_class_t *reload_cls, + int allow_remat); + +/** + * Analog to be_add_reload, but places the reload "on an edge" between 2 blocks + * @see be_add_reload + */ +void be_add_reload_on_edge(spill_env_t *senv, ir_node *to_spill, ir_node *bl, + int pos, const arch_register_class_t *reload_cls, + int allow_remat); + +/** + * Analog to be_add_reload but adds an already created rematerialized node. + */ +void be_add_remat(spill_env_t *env, ir_node *to_spill, ir_node *before, + ir_node *rematted_node); + +/** + * The main function that places real spills/reloads (or rematerializes values) + * for all values where be_add_reload was called. It then rebuilds the + * SSA-form and updates liveness information + */ +void be_insert_spills_reloads(spill_env_t *senv); + +/** + * There are 2 possibilities to spill a phi node: Only it's value, or replacing + * the whole phi-node with a memory phi. Normally only the value of a phi will + * be spilled unless you mark the phi with be_spill_phi. + * (Remember that each phi needs a register, so you have to spill phis when + * there are more phis than registers in a block) + */ +void be_spill_phi(spill_env_t *env, ir_node *node); + +/** + * Returns the estimated costs if a node would ge spilled. This does only return + * the costs for the spill instructions, not the costs for needed reload + * instructions. The value is weighted by the estimated execution frequency of + * the spill. + */ +double be_get_spill_costs(spill_env_t *env, ir_node *to_spill, ir_node *before); + +/** + * Returns the estimated costs if a node would get reloaded at a specific place + * This returns the costs for a reload instructions, or when possible the costs + * for a rematerialisation. The value is weighted by the estimated execution + * frequency of the reload/rematerialisation. + */ +double be_get_reload_costs(spill_env_t *env, ir_node *to_spill, + ir_node *before); + +unsigned be_get_reload_costs_no_weight(spill_env_t *env, const ir_node *to_spill, + const ir_node *before); + -void be_add_reload_on_edge(spill_env_t *senv, ir_node *to_spill, ir_node *bl, int pos); +/** + * Analog to be_get_reload_costs but returns the cost if the reload would be + * placed "on an edge" between 2 blocks + */ +double be_get_reload_costs_on_edge(spill_env_t *env, ir_node *to_spill, + ir_node *block, int pos); + +typedef struct { + unsigned n_spills; + unsigned n_reloads; + double spill_costs; + double reload_costs; +} be_total_spill_costs_t; -void be_insert_spills_reloads(spill_env_t *senv, pset *reload_set); +/** + * Insert a spill after the definition of the given node if there is a reload that is not dominated by some spill. + * This function checks whether there is a reload that is not dominated by some spill for that node. + * If so, it inserts a spill right after the definition of the node. + * @param env The spill environment. + * @param irn The node to check for. + */ +void make_spill_locations_dominate_irn(spill_env_t *env, ir_node *irn); /** - * Computes the spill offsets for all spill nodes in the irg + * Collect spill/reload cost statistics for a graph. + * @param birg The backend graph. + * @param costs A struct which will be filled with the costs. */ -void be_compute_spill_offsets(be_chordal_env_t *cenv); +void be_get_total_spill_costs(be_irg_t *birg, be_total_spill_costs_t *costs); /** - * Sets the debug module of a spill environment. + * Check, if a node is rematerializable. + * @param env The spill env. + */ -DEBUG_ONLY(void be_set_spill_env_dbg_module(spill_env_t *env, firm_dbg_module_t *dbg)); +int be_is_rematerializable(spill_env_t *env, const ir_node *to_remat, const ir_node *before); -#endif /* BESPILL_H_ */ +#endif