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/* Definitions for transformations based on profile information for values.
Copyright (C) 2003, 2004 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 2, 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 COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#ifndef GCC_VALUE_PROF_H
#define GCC_VALUE_PROF_H
/* Supported histogram types. */
enum hist_type
{
HIST_TYPE_INTERVAL, /* Measures histogram of values inside a specified
interval. */
HIST_TYPE_POW2, /* Histogram of power of 2 values. */
HIST_TYPE_SINGLE_VALUE, /* Tries to identify the value that is (almost)
always constant. */
HIST_TYPE_CONST_DELTA /* Tries to identify the (almost) always constant
difference between two evaluations of a value. */
};
#define COUNTER_FOR_HIST_TYPE(TYPE) ((int) (TYPE) + GCOV_FIRST_VALUE_COUNTER)
#define HIST_TYPE_FOR_COUNTER(COUNTER) \
((enum hist_type) ((COUNTER) - GCOV_FIRST_VALUE_COUNTER))
/* The value to measure. */
/* The void *'s are either rtx or tree, depending on which IR is in use. */
struct histogram_value_t GTY(())
{
PTR GTY ((skip (""))) value; /* The value to profile. */
enum machine_mode mode; /* And its mode. */
PTR GTY ((skip (""))) seq; /* Insns required to count the
profiled value. */
PTR GTY ((skip (""))) insn; /* Insn before that to measure. */
enum hist_type type; /* Type of information to measure. */
unsigned n_counters; /* Number of required counters. */
union
{
struct
{
int int_start; /* First value in interval. */
int steps; /* Number of values in it. */
int may_be_less; /* May the value be below? */
int may_be_more; /* Or above. */
} intvl; /* Interval histogram data. */
struct
{
int may_be_other; /* If the value may be non-positive or not 2^k. */
} pow2; /* Power of 2 histogram data. */
} hdata; /* Profiled information specific data. */
};
typedef struct histogram_value_t *histogram_value;
DEF_VEC_GC_P(histogram_value);
typedef VEC(histogram_value) *histogram_values;
/* Hooks registration. */
extern void rtl_register_value_prof_hooks (void);
extern void tree_register_value_prof_hooks (void);
/* IR-independent entry points. */
extern void find_values_to_profile (histogram_values *);
extern bool value_profile_transformations (void);
/* External declarations for edge-based profiling. */
struct profile_hooks {
/* Insert code to initialize edge profiler. */
void (*init_edge_profiler) (void);
/* Insert code to increment an edge count. */
void (*gen_edge_profiler) (int, edge);
/* Insert code to increment the interval histogram counter. */
void (*gen_interval_profiler) (histogram_value, unsigned, unsigned);
/* Insert code to increment the power of two histogram counter. */
void (*gen_pow2_profiler) (histogram_value, unsigned, unsigned);
/* Insert code to find the most common value. */
void (*gen_one_value_profiler) (histogram_value, unsigned, unsigned);
/* Insert code to find the most common value of a difference between two
evaluations of an expression. */
void (*gen_const_delta_profiler) (histogram_value, unsigned, unsigned);
FILE * (*profile_dump_file) (void);
};
/* In profile.c. */
extern void init_branch_prob (void);
extern void branch_prob (void);
extern void end_branch_prob (void);
extern void tree_register_profile_hooks (void);
extern void rtl_register_profile_hooks (void);
/* In tree-profile.c. */
extern struct profile_hooks tree_profile_hooks;
/* In rtl-profile.c. */
extern struct profile_hooks rtl_profile_hooks;
#endif /* GCC_VALUE_PROF_H */
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