112 lines
4.6 KiB
C
112 lines
4.6 KiB
C
/* Definitions for branch prediction routines in the GNU compiler.
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Copyright (C) 2001-2023 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_PREDICT_H
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#define GCC_PREDICT_H
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#include "profile-count.h"
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/* Random guesstimation given names.
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PROB_VERY_UNLIKELY should be small enough so basic block predicted
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by it gets below HOT_BB_FREQUENCY_FRACTION. */
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#define PROB_VERY_UNLIKELY (REG_BR_PROB_BASE / 2000 - 1)
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#define PROB_EVEN (REG_BR_PROB_BASE / 2)
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#define PROB_VERY_LIKELY (REG_BR_PROB_BASE - PROB_VERY_UNLIKELY)
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#define PROB_ALWAYS (REG_BR_PROB_BASE)
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#define PROB_UNLIKELY (REG_BR_PROB_BASE / 5 - 1)
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#define PROB_LIKELY (REG_BR_PROB_BASE - PROB_UNLIKELY)
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#define PROB_UNINITIALIZED (-1)
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#define DEF_PREDICTOR(ENUM, NAME, HITRATE, FLAGS) ENUM,
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enum br_predictor
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{
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#include "predict.def"
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/* Upper bound on non-language-specific builtins. */
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END_PREDICTORS
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};
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#undef DEF_PREDICTOR
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enum prediction
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{
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NOT_TAKEN,
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TAKEN
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};
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/* In emit-rtl.cc. */
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extern profile_probability split_branch_probability;
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extern gcov_type get_hot_bb_threshold (void);
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extern void set_hot_bb_threshold (gcov_type);
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extern bool maybe_hot_count_p (struct function *, profile_count);
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extern bool maybe_hot_bb_p (struct function *, const_basic_block);
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extern bool maybe_hot_edge_p (edge);
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extern bool probably_never_executed_bb_p (struct function *, const_basic_block);
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extern bool probably_never_executed_edge_p (struct function *, edge);
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extern enum optimize_size_level optimize_function_for_size_p (struct function *);
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extern bool optimize_function_for_speed_p (struct function *);
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extern optimization_type function_optimization_type (struct function *);
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extern enum optimize_size_level optimize_bb_for_size_p (const_basic_block);
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extern bool optimize_bb_for_speed_p (const_basic_block);
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extern optimization_type bb_optimization_type (const_basic_block);
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extern enum optimize_size_level optimize_edge_for_size_p (edge);
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extern bool optimize_edge_for_speed_p (edge);
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extern enum optimize_size_level optimize_insn_for_size_p (void);
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extern bool optimize_insn_for_speed_p (void);
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extern optimization_type insn_optimization_type ();
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extern enum optimize_size_level optimize_loop_for_size_p (class loop *);
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extern bool optimize_loop_for_speed_p (class loop *);
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extern bool optimize_loop_nest_for_speed_p (class loop *);
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extern enum optimize_size_level optimize_loop_nest_for_size_p (class loop *);
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extern bool predictable_edge_p (edge);
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extern void rtl_profile_for_bb (basic_block);
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extern void rtl_profile_for_edge (edge);
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extern void default_rtl_profile (void);
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extern bool rtl_predicted_by_p (const_basic_block, enum br_predictor);
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extern bool gimple_predicted_by_p (const_basic_block, enum br_predictor);
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extern bool edge_probability_reliable_p (const_edge);
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extern bool br_prob_note_reliable_p (const_rtx);
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extern void predict_insn_def (rtx_insn *, enum br_predictor, enum prediction);
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extern void rtl_predict_edge (edge, enum br_predictor, int);
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extern void gimple_predict_edge (edge, enum br_predictor, int);
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extern void remove_predictions_associated_with_edge (edge);
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extern void predict_edge_def (edge, enum br_predictor, enum prediction);
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extern void invert_br_probabilities (rtx);
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extern void guess_outgoing_edge_probabilities (basic_block);
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extern void tree_guess_outgoing_edge_probabilities (basic_block);
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extern void tree_estimate_probability (bool);
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extern void handle_missing_profiles (void);
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extern bool update_max_bb_count (void);
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extern bool expensive_function_p (int);
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extern void estimate_bb_frequencies (bool);
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extern void compute_function_frequency (void);
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extern tree build_predict_expr (enum br_predictor, enum prediction);
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extern const char *predictor_name (enum br_predictor);
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extern void rebuild_frequencies (void);
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extern void report_predictor_hitrates (void);
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extern void force_edge_cold (edge, bool);
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extern void propagate_unlikely_bbs_forward (void);
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extern void change_edge_frequency (edge, profile_probability);
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extern void add_reg_br_prob_note (rtx_insn *, profile_probability);
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/* In ipa-pure-const.cc */
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extern void warn_function_cold (tree);
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#endif /* GCC_PREDICT_H */
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