gcc/value-prof.h

   1 /* Definitions for transformations based on profile information for values.
   2    Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301, USA.  */
  20
  21 #ifndef GCC_VALUE_PROF_H
  22 #define GCC_VALUE_PROF_H
  23
  24 /* Supported histogram types.  */
  25 enum hist_type
  26 {
  27   HIST_TYPE_INTERVAL,   /* Measures histogram of values inside a specified
  28                            interval.  */
  29   HIST_TYPE_POW2,       /* Histogram of power of 2 values.  */
  30   HIST_TYPE_SINGLE_VALUE, /* Tries to identify the value that is (almost)
  31                            always constant.  */
  32   HIST_TYPE_CONST_DELTA /* Tries to identify the (almost) always constant
  33                            difference between two evaluations of a value.  */
  34 };
  35
  36 #define COUNTER_FOR_HIST_TYPE(TYPE) ((int) (TYPE) + GCOV_FIRST_VALUE_COUNTER)
  37 #define HIST_TYPE_FOR_COUNTER(COUNTER) \
  38   ((enum hist_type) ((COUNTER) - GCOV_FIRST_VALUE_COUNTER))
  39
  40 /* The value to measure.  */
  41 struct histogram_value_t
  42 {
  43   struct
  44     {
  45       tree value;               /* The value to profile.  */
  46       tree stmt;                /* Insn containing the value.  */
  47       gcov_type *counters;                      /* Pointer to first counter.  */
  48       struct histogram_value_t *next;           /* Linked list pointer.  */
  49     } hvalue;
  50   enum hist_type type;                  /* Type of information to measure.  */
  51   unsigned n_counters;                  /* Number of required counters.  */
  52   union
  53     {
  54       struct
  55         {
  56           int int_start;        /* First value in interval.  */
  57           unsigned int steps;   /* Number of values in it.  */
  58         } intvl;        /* Interval histogram data.  */
  59     } hdata;            /* Profiled information specific data.  */
  60 };
  61
  62 typedef struct histogram_value_t *histogram_value;
  63
  64 DEF_VEC_P(histogram_value);
  65 DEF_VEC_ALLOC_P(histogram_value,heap);
  66
  67 typedef VEC(histogram_value,heap) *histogram_values;
  68
  69 /* Hooks registration.  */
  70 extern void tree_register_value_prof_hooks (void);
  71
  72 /* IR-independent entry points.  */
  73 extern void find_values_to_profile (histogram_values *);
  74 extern bool value_profile_transformations (void);
  75 \f
  76 /* External declarations for edge-based profiling.  */
  77 struct profile_hooks {
  78
  79   /* Insert code to initialize edge profiler.  */
  80   void (*init_edge_profiler) (void);
  81
  82   /* Insert code to increment an edge count.  */
  83   void (*gen_edge_profiler) (int, edge);
  84
  85   /* Insert code to increment the interval histogram counter.  */
  86   void (*gen_interval_profiler) (histogram_value, unsigned, unsigned);
  87
  88   /* Insert code to increment the power of two histogram counter.  */
  89   void (*gen_pow2_profiler) (histogram_value, unsigned, unsigned);
  90
  91   /* Insert code to find the most common value.  */
  92   void (*gen_one_value_profiler) (histogram_value, unsigned, unsigned);
  93
  94   /* Insert code to find the most common value of a difference between two
  95      evaluations of an expression.  */
  96   void (*gen_const_delta_profiler) (histogram_value, unsigned, unsigned);
  97 };
  98
  99 /* In profile.c.  */
 100 extern void init_branch_prob (void);
 101 extern void branch_prob (void);
 102 extern void end_branch_prob (void);
 103 extern void tree_register_profile_hooks (void);
 104
 105 /* In tree-profile.c.  */
 106 extern struct profile_hooks tree_profile_hooks;
 107
 108 #endif  /* GCC_VALUE_PROF_H */
 109