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/* Definitions for branch prediction routines in the GNU compiler.
Copyright (C) 2001-2015 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
/* 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 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
};
extern gcov_type get_hot_bb_threshold (void);
extern void set_hot_bb_threshold (gcov_type);
extern bool maybe_hot_count_p (struct function *, gcov_type);
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 bool optimize_function_for_size_p (struct function *);
extern bool optimize_function_for_speed_p (struct function *);
extern bool optimize_bb_for_size_p (const_basic_block);
extern bool optimize_bb_for_speed_p (const_basic_block);
extern bool optimize_edge_for_size_p (edge);
extern bool optimize_edge_for_speed_p (edge);
extern bool optimize_insn_for_size_p (void);
extern bool optimize_insn_for_speed_p (void);
extern bool optimize_loop_for_size_p (struct loop *);
extern bool optimize_loop_for_speed_p (struct loop *);
extern bool optimize_loop_nest_for_speed_p (struct loop *);
extern bool optimize_loop_nest_for_size_p (struct 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_estimate_probability (void);
extern void handle_missing_profiles (void);
extern int counts_to_freqs (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);
#endif /* GCC_PREDICT_H */
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