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authorMatthias Braun <matze@braunis.de>2009-08-11 13:46:32 +0200
committerMatthias Braun <matze@braunis.de>2009-08-11 13:46:32 +0200
commitf6750fd8b384d9795d13ab2985b4a4a631a31e7e (patch)
treef12fc07e5d7dd0b410a6bf29b7dc29f938eca462 /ir/be/bespillutil.h
parent47b32a3377e6c02c68b864ee2cef6810d83ccb67 (diff)
- implement output constraint enforcement for new register allocator
- rename bespilloptions.* to bespill.* and bespill.* to bespillutil.* [r26327]
Diffstat (limited to 'ir/be/bespillutil.h')
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+/*
+ * 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.
+ */
+
+/**
+ * @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_BESPILLUTIL_H
+#define FIRM_BE_BESPILLUTIL_H
+
+#include "firm_types.h"
+#include "debug.h"
+
+#include "bearch.h"
+#include "beirg.h"
+
+typedef struct spill_env_t spill_env_t;
+
+/**
+ * Creates a new spill environment.
+ */
+spill_env_t *be_new_spill_env(be_irg_t *birg);
+
+/**
+ * Deletes a spill environment.
+ */
+void be_delete_spill_env(spill_env_t *senv);
+
+/**
+ * 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);
+
+
+/**
+ * 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;
+
+/**
+ * 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);
+
+/**
+ * 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_get_total_spill_costs(be_irg_t *birg, be_total_spill_costs_t *costs);
+
+/**
+ * Check, if a node is rematerializable.
+ * @param env The spill env.
+
+ */
+int be_is_rematerializable(spill_env_t *env, const ir_node *to_remat, const ir_node *before);
+
+#endif