xref: /dragonfly/contrib/gcc-4.7/gcc/value-prof.h (revision e4b17023)

/* Definitions for transformations based on profile information for values.
   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2010
   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;

extern void gimple_find_values_to_profile (histogram_values *);
extern bool gimple_value_profile_transformations (void);

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 tree-profile.c.  */
extern void gimple_init_edge_profiler (void);
extern void gimple_gen_edge_profiler (int, edge);
extern void gimple_gen_interval_profiler (histogram_value, unsigned, unsigned);
extern void gimple_gen_pow2_profiler (histogram_value, unsigned, unsigned);
extern void gimple_gen_one_value_profiler (histogram_value, unsigned, unsigned);
extern void gimple_gen_ic_profiler (histogram_value, unsigned, unsigned);
extern void gimple_gen_ic_func_profiler (void);
extern void gimple_gen_const_delta_profiler (histogram_value,
					     unsigned, unsigned);
extern void gimple_gen_average_profiler (histogram_value, unsigned, unsigned);
extern void gimple_gen_ior_profiler (histogram_value, unsigned, unsigned);

/* In profile.c.  */
extern void init_branch_prob (void);
extern void branch_prob (void);
extern void end_branch_prob (void);

#endif	/* GCC_VALUE_PROF_H */