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/* Definitions for transformations based on profile information for values.
Copyright (C) 2003 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. */
/* 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. */
struct histogram_value
{
rtx value; /* The value to profile. */
enum machine_mode mode; /* And its mode. */
rtx seq; /* Insns required to count the profiled value. */
rtx 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. */
};
extern void find_values_to_profile (unsigned *, struct histogram_value **);
extern void free_profiled_values (unsigned, struct histogram_value *);
extern bool value_profile_transformations (void);
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