gcc/value-prof.h

   1 /* Definitions for transformations based on profile information for values.
   2    Copyright (C) 2003, 2004, 2005, 2007 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_VALUE_PROF_H
  21 #define GCC_VALUE_PROF_H
  22
  23 /* Supported histogram types.  */
  24 enum hist_type
  25 {
  26   HIST_TYPE_INTERVAL,   /* Measures histogram of values inside a specified
  27                            interval.  */
  28   HIST_TYPE_POW2,       /* Histogram of power of 2 values.  */
  29   HIST_TYPE_SINGLE_VALUE, /* Tries to identify the value that is (almost)
  30                            always constant.  */
  31   HIST_TYPE_CONST_DELTA, /* Tries to identify the (almost) always constant
  32                            difference between two evaluations of a value.  */
  33   HIST_TYPE_INDIR_CALL,   /* Tries to identify the function that is (almost)
  34                             called in indirect call */
  35   HIST_TYPE_AVERAGE,    /* Compute average value (sum of all values).  */
  36   HIST_TYPE_IOR         /* Used to compute expected alignment.  */
  37 };
  38
  39 #define COUNTER_FOR_HIST_TYPE(TYPE) ((int) (TYPE) + GCOV_FIRST_VALUE_COUNTER)
  40 #define HIST_TYPE_FOR_COUNTER(COUNTER) \
  41   ((enum hist_type) ((COUNTER) - GCOV_FIRST_VALUE_COUNTER))
  42
  43 /* The value to measure.  */
  44 struct histogram_value_t
  45 {
  46   struct
  47     {
  48       tree value;               /* The value to profile.  */
  49       gimple stmt;              /* Insn containing the value.  */
  50       gcov_type *counters;                      /* Pointer to first counter.  */
  51       struct histogram_value_t *next;           /* Linked list pointer.  */
  52     } hvalue;
  53   enum hist_type type;                  /* Type of information to measure.  */
  54   unsigned n_counters;                  /* Number of required counters.  */
  55   union
  56     {
  57       struct
  58         {
  59           int int_start;        /* First value in interval.  */
  60           unsigned int steps;   /* Number of values in it.  */
  61         } intvl;        /* Interval histogram data.  */
  62     } hdata;            /* Profiled information specific data.  */
  63 };
  64
  65 typedef struct histogram_value_t *histogram_value;
  66 typedef const struct histogram_value_t *const_histogram_value;
  67
  68 DEF_VEC_P(histogram_value);
  69 DEF_VEC_ALLOC_P(histogram_value,heap);
  70
  71 typedef VEC(histogram_value,heap) *histogram_values;
  72
  73 /* Hooks registration.  */
  74 extern void gimple_register_value_prof_hooks (void);
  75
  76 /* IR-independent entry points.  */
  77 extern void find_values_to_profile (histogram_values *);
  78 extern bool value_profile_transformations (void);
  79 \f
  80 /* External declarations for edge-based profiling.  */
  81 struct profile_hooks {
  82
  83   /* Insert code to initialize edge profiler.  */
  84   void (*init_edge_profiler) (void);
  85
  86   /* Insert code to increment an edge count.  */
  87   void (*gen_edge_profiler) (int, edge);
  88
  89   /* Insert code to increment the interval histogram counter.  */
  90   void (*gen_interval_profiler) (histogram_value, unsigned, unsigned);
  91
  92   /* Insert code to increment the power of two histogram counter.  */
  93   void (*gen_pow2_profiler) (histogram_value, unsigned, unsigned);
  94
  95   /* Insert code to find the most common value.  */
  96   void (*gen_one_value_profiler) (histogram_value, unsigned, unsigned);
  97
  98   /* Insert code to find the most common value of a difference between two
  99      evaluations of an expression.  */
 100   void (*gen_const_delta_profiler) (histogram_value, unsigned, unsigned);
 101
 102   /* Insert code to find the most common indirect call */
 103   void (*gen_ic_profiler) (histogram_value, unsigned, unsigned);
 104
 105   /* Insert code to find the average value of an expression.  */
 106   void (*gen_average_profiler) (histogram_value, unsigned, unsigned);
 107
 108   /* Insert code to ior value of an expression.  */
 109   void (*gen_ior_profiler) (histogram_value, unsigned, unsigned);
 110 };
 111
 112 histogram_value gimple_histogram_value (struct function *, gimple);
 113 histogram_value gimple_histogram_value_of_type (struct function *, gimple,
 114                                                 enum hist_type);
 115 void gimple_add_histogram_value (struct function *, gimple, histogram_value);
 116 void dump_histograms_for_stmt (struct function *, FILE *, gimple);
 117 void gimple_remove_histogram_value (struct function *, gimple, histogram_value);
 118 void gimple_remove_stmt_histograms (struct function *, gimple);
 119 void gimple_duplicate_stmt_histograms (struct function *, gimple,
 120                                        struct function *, gimple);
 121 void gimple_move_stmt_histograms (struct function *, gimple, gimple);
 122 void verify_histograms (void);
 123 void free_histograms (void);
 124 void stringop_block_profile (gimple, unsigned int *, HOST_WIDE_INT *);
 125
 126 /* In profile.c.  */
 127 extern void init_branch_prob (void);
 128 extern void branch_prob (void);
 129 extern void end_branch_prob (void);
 130 extern void tree_register_profile_hooks (void);
 131
 132 /* In tree-profile.c.  */
 133 extern struct profile_hooks tree_profile_hooks;
 134
 135 #endif  /* GCC_VALUE_PROF_H */
 136