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/* Definitions for transformations based on profile information for values.
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Copyright (C) 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_VALUE_PROF_H
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#define GCC_VALUE_PROF_H
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/* Supported histogram types. */
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enum hist_type
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{
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HIST_TYPE_INTERVAL, /* Measures histogram of values inside a specified
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interval. */
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HIST_TYPE_POW2, /* Histogram of power of 2 values. */
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HIST_TYPE_SINGLE_VALUE, /* Tries to identify the value that is (almost)
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always constant. */
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HIST_TYPE_CONST_DELTA /* Tries to identify the (almost) always constant
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difference between two evaluations of a value. */
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};
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#define COUNTER_FOR_HIST_TYPE(TYPE) ((int) (TYPE) + GCOV_FIRST_VALUE_COUNTER)
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#define HIST_TYPE_FOR_COUNTER(COUNTER) \
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((enum hist_type) ((COUNTER) - GCOV_FIRST_VALUE_COUNTER))
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/* The value to measure. */
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struct histogram_value_t
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{
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struct
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{
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tree value; /* The value to profile. */
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tree stmt; /* Insn containing the value. */
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gcov_type *counters; /* Pointer to first counter. */
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struct histogram_value_t *next; /* Linked list pointer. */
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} hvalue;
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enum hist_type type; /* Type of information to measure. */
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unsigned n_counters; /* Number of required counters. */
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union
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{
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struct
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{
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int int_start; /* First value in interval. */
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unsigned int steps; /* Number of values in it. */
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} intvl; /* Interval histogram data. */
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} hdata; /* Profiled information specific data. */
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};
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typedef struct histogram_value_t *histogram_value;
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DEF_VEC_P(histogram_value);
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DEF_VEC_ALLOC_P(histogram_value,heap);
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typedef VEC(histogram_value,heap) *histogram_values;
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/* Hooks registration. */
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extern void tree_register_value_prof_hooks (void);
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/* IR-independent entry points. */
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extern void find_values_to_profile (histogram_values *);
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extern bool value_profile_transformations (void);
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/* External declarations for edge-based profiling. */
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struct profile_hooks {
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/* Insert code to initialize edge profiler. */
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void (*init_edge_profiler) (void);
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/* Insert code to increment an edge count. */
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void (*gen_edge_profiler) (int, edge);
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/* Insert code to increment the interval histogram counter. */
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void (*gen_interval_profiler) (histogram_value, unsigned, unsigned);
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/* Insert code to increment the power of two histogram counter. */
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void (*gen_pow2_profiler) (histogram_value, unsigned, unsigned);
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/* Insert code to find the most common value. */
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void (*gen_one_value_profiler) (histogram_value, unsigned, unsigned);
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/* Insert code to find the most common value of a difference between two
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evaluations of an expression. */
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void (*gen_const_delta_profiler) (histogram_value, unsigned, unsigned);
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};
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/* In profile.c. */
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extern void init_branch_prob (void);
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extern void branch_prob (void);
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extern void end_branch_prob (void);
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extern void tree_register_profile_hooks (void);
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/* In tree-profile.c. */
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extern struct profile_hooks tree_profile_hooks;
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#endif /* GCC_VALUE_PROF_H */
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