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/* Definitions for transformations based on profile information for values.

   Copyright (C) 2003, 2004, 2005, 2007, 2008 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_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.  */

  HIST_TYPE_INDIR_CALL,   /* Tries to identify the function that is (almost)

                            called in indirect call */

  HIST_TYPE_AVERAGE,    /* Compute average value (sum of all values).  */

  HIST_TYPE_IOR         /* Used to compute expected alignment.  */

};

#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.  */

struct histogram_value_t

{

  struct

    {

      tree value;               /* The value to profile.  */

      gimple stmt;              /* Insn containing the value.  */

      gcov_type *counters;                      /* Pointer to first counter.  */

      struct histogram_value_t *next;           /* Linked list pointer.  */

    } hvalue;

  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.  */

          unsigned int steps;   /* Number of values in it.  */

        } intvl;        /* Interval histogram data.  */

    } hdata;            /* Profiled information specific data.  */

};

typedef struct histogram_value_t *histogram_value;

typedef const struct histogram_value_t *const_histogram_value;

DEF_VEC_P(histogram_value);

DEF_VEC_ALLOC_P(histogram_value,heap);

typedef VEC(histogram_value,heap) *histogram_values;

/* Hooks registration.  */

extern void gimple_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);

  /* Insert code to find the most common indirect call */

  void (*gen_ic_profiler) (histogram_value, unsigned, unsigned);

  /* Insert code to find the average value of an expression.  */

  void (*gen_average_profiler) (histogram_value, unsigned, unsigned);

  /* Insert code to ior value of an expression.  */

  void (*gen_ior_profiler) (histogram_value, unsigned, unsigned);

};

histogram_value gimple_histogram_value (struct function *, gimple);

histogram_value gimple_histogram_value_of_type (struct function *, gimple,

                                                enum hist_type);

void gimple_add_histogram_value (struct function *, gimple, histogram_value);

void dump_histograms_for_stmt (struct function *, FILE *, gimple);

void gimple_remove_histogram_value (struct function *, gimple, histogram_value);

void gimple_remove_stmt_histograms (struct function *, gimple);

void gimple_duplicate_stmt_histograms (struct function *, gimple,

                                       struct function *, gimple);

void gimple_move_stmt_histograms (struct function *, gimple, gimple);

void verify_histograms (void);

void free_histograms (void);

void stringop_block_profile (gimple, unsigned int *, HOST_WIDE_INT *);

/* 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);

/* In tree-profile.c.  */

extern struct profile_hooks tree_profile_hooks;

#endif  /* GCC_VALUE_PROF_H */