source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/tools/avr/lib/gcc/avr/4.9.2/plugin/include/predict.h @ 4837

Last change on this file since 4837 was 4837, checked in by daduve, 2 years ago

Adding new version

File size: 2.0 KB
Line 
1/* Definitions for branch prediction routines in the GNU compiler.
2   Copyright (C) 2001-2014 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20#ifndef GCC_PREDICT_H
21#define GCC_PREDICT_H
22
23/* Random guesstimation given names.
24   PROB_VERY_UNLIKELY should be small enough so basic block predicted
25   by it gets below HOT_BB_FREQUENCY_FRACTION.  */
26#define PROB_VERY_UNLIKELY      (REG_BR_PROB_BASE / 2000 - 1)
27#define PROB_EVEN               (REG_BR_PROB_BASE / 2)
28#define PROB_VERY_LIKELY        (REG_BR_PROB_BASE - PROB_VERY_UNLIKELY)
29#define PROB_ALWAYS             (REG_BR_PROB_BASE)
30#define PROB_UNLIKELY           (REG_BR_PROB_BASE / 5 - 1)
31#define PROB_LIKELY             (REG_BR_PROB_BASE - PROB_UNLIKELY)
32
33#define DEF_PREDICTOR(ENUM, NAME, HITRATE, FLAGS) ENUM,
34enum br_predictor
35{
36#include "predict.def"
37
38  /* Upper bound on non-language-specific builtins.  */
39  END_PREDICTORS
40};
41#undef DEF_PREDICTOR
42enum prediction
43{
44   NOT_TAKEN,
45   TAKEN
46};
47
48extern void predict_insn_def (rtx, enum br_predictor, enum prediction);
49extern int counts_to_freqs (void);
50extern void handle_missing_profiles (void);
51extern void estimate_bb_frequencies (bool);
52extern const char *predictor_name (enum br_predictor);
53extern tree build_predict_expr (enum br_predictor, enum prediction);
54extern void tree_estimate_probability (void);
55extern void compute_function_frequency (void);
56extern void rebuild_frequencies (void);
57
58#endif  /* GCC_PREDICT_H */
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