blob: 23435dc2c99d0ebf068a47e870cbb13a2306a2f6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
/* Definitions for branch prediction routines in the GNU compiler.
Copyright (C) 2001-2013 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 (PROB_ALWAYS - PROB_VERY_LIKELY)
#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 void predict_insn_def (rtx, enum br_predictor, enum prediction);
extern int counts_to_freqs (void);
extern void handle_missing_profiles (void);
extern void estimate_bb_frequencies (bool);
extern const char *predictor_name (enum br_predictor);
extern tree build_predict_expr (enum br_predictor, enum prediction);
extern void tree_estimate_probability (void);
extern void compute_function_frequency (void);
extern void rebuild_frequencies (void);
#endif /* GCC_PREDICT_H */
|
