| /* Definitions for branch prediction routines in the GNU compiler. |
| Copyright (C) 2001-2021 Free Software Foundation, Inc. |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify it under |
| the terms of the GNU General Public License as published by the Free |
| Software Foundation; either version 3, or (at your option) any later |
| version. |
| |
| GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef GCC_PREDICT_H |
| #define GCC_PREDICT_H |
| |
| #include "profile-count.h" |
| |
| /* Random guesstimation given names. |
| PROB_VERY_UNLIKELY should be small enough so basic block predicted |
| by it gets below HOT_BB_FREQUENCY_FRACTION. */ |
| #define PROB_VERY_UNLIKELY (REG_BR_PROB_BASE / 2000 - 1) |
| #define PROB_EVEN (REG_BR_PROB_BASE / 2) |
| #define PROB_VERY_LIKELY (REG_BR_PROB_BASE - PROB_VERY_UNLIKELY) |
| #define PROB_ALWAYS (REG_BR_PROB_BASE) |
| #define PROB_UNLIKELY (REG_BR_PROB_BASE / 5 - 1) |
| #define PROB_LIKELY (REG_BR_PROB_BASE - PROB_UNLIKELY) |
| #define PROB_UNINITIALIZED (-1) |
| |
| #define DEF_PREDICTOR(ENUM, NAME, HITRATE, FLAGS) ENUM, |
| enum br_predictor |
| { |
| #include "predict.def" |
| |
| /* Upper bound on non-language-specific builtins. */ |
| END_PREDICTORS |
| }; |
| #undef DEF_PREDICTOR |
| enum prediction |
| { |
| NOT_TAKEN, |
| TAKEN |
| }; |
| |
| /* In emit-rtl.c. */ |
| extern profile_probability split_branch_probability; |
| |
| extern gcov_type get_hot_bb_threshold (void); |
| extern void set_hot_bb_threshold (gcov_type); |
| extern bool maybe_hot_count_p (struct function *, profile_count); |
| extern bool maybe_hot_bb_p (struct function *, const_basic_block); |
| extern bool maybe_hot_edge_p (edge); |
| extern bool probably_never_executed_bb_p (struct function *, const_basic_block); |
| extern bool probably_never_executed_edge_p (struct function *, edge); |
| extern enum optimize_size_level optimize_function_for_size_p (struct function *); |
| extern bool optimize_function_for_speed_p (struct function *); |
| extern optimization_type function_optimization_type (struct function *); |
| extern enum optimize_size_level optimize_bb_for_size_p (const_basic_block); |
| extern bool optimize_bb_for_speed_p (const_basic_block); |
| extern optimization_type bb_optimization_type (const_basic_block); |
| extern enum optimize_size_level optimize_edge_for_size_p (edge); |
| extern bool optimize_edge_for_speed_p (edge); |
| extern enum optimize_size_level optimize_insn_for_size_p (void); |
| extern bool optimize_insn_for_speed_p (void); |
| extern enum optimize_size_level optimize_loop_for_size_p (class loop *); |
| extern bool optimize_loop_for_speed_p (class loop *); |
| extern bool optimize_loop_nest_for_speed_p (class loop *); |
| extern enum optimize_size_level optimize_loop_nest_for_size_p (class loop *); |
| extern bool predictable_edge_p (edge); |
| extern void rtl_profile_for_bb (basic_block); |
| extern void rtl_profile_for_edge (edge); |
| extern void default_rtl_profile (void); |
| extern bool rtl_predicted_by_p (const_basic_block, enum br_predictor); |
| extern bool gimple_predicted_by_p (const_basic_block, enum br_predictor); |
| extern bool edge_probability_reliable_p (const_edge); |
| extern bool br_prob_note_reliable_p (const_rtx); |
| extern void predict_insn_def (rtx_insn *, enum br_predictor, enum prediction); |
| extern void rtl_predict_edge (edge, enum br_predictor, int); |
| extern void gimple_predict_edge (edge, enum br_predictor, int); |
| extern void remove_predictions_associated_with_edge (edge); |
| extern void predict_edge_def (edge, enum br_predictor, enum prediction); |
| extern void invert_br_probabilities (rtx); |
| extern void guess_outgoing_edge_probabilities (basic_block); |
| extern void tree_guess_outgoing_edge_probabilities (basic_block); |
| extern void tree_estimate_probability (bool); |
| extern void handle_missing_profiles (void); |
| extern bool update_max_bb_count (void); |
| extern bool expensive_function_p (int); |
| extern void estimate_bb_frequencies (bool); |
| extern void compute_function_frequency (void); |
| extern tree build_predict_expr (enum br_predictor, enum prediction); |
| extern const char *predictor_name (enum br_predictor); |
| extern void rebuild_frequencies (void); |
| extern void report_predictor_hitrates (void); |
| extern void force_edge_cold (edge, bool); |
| extern void propagate_unlikely_bbs_forward (void); |
| extern void change_edge_frequency (edge, profile_probability); |
| |
| extern void add_reg_br_prob_note (rtx_insn *, profile_probability); |
| |
| /* In ipa-pure-const.c */ |
| extern void warn_function_cold (tree); |
| |
| #endif /* GCC_PREDICT_H */ |