gcc/value-prof.h

   1 /* Definitions for transformations based on profile information for values.
   2    Copyright (C) 2003-2021 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_TOPN_VALUES, /* Tries to identify the N most common values.  */
  30   HIST_TYPE_INDIR_CALL,   /* Tries to identify the function that is (almost)
  31                             called in indirect call */
  32   HIST_TYPE_AVERAGE,    /* Compute average value (sum of all values).  */
  33   HIST_TYPE_IOR,        /* Used to compute expected alignment.  */
  34   HIST_TYPE_TIME_PROFILE, /* Used for time profile */
  35   HIST_TYPE_MAX
  36 };
  37
  38 #define COUNTER_FOR_HIST_TYPE(TYPE) ((int) (TYPE) + GCOV_FIRST_VALUE_COUNTER)
  39 #define HIST_TYPE_FOR_COUNTER(COUNTER) \
  40   ((enum hist_type) ((COUNTER) - GCOV_FIRST_VALUE_COUNTER))
  41
  42 \f
  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   struct function *fun;
  56   union
  57     {
  58       struct
  59         {
  60           int int_start;        /* First value in interval.  */
  61           unsigned int steps;   /* Number of values in it.  */
  62         } intvl;        /* Interval histogram data.  */
  63     } hdata;            /* Profiled information specific data.  */
  64 };
  65
  66 typedef struct histogram_value_t *histogram_value;
  67 typedef const struct histogram_value_t *const_histogram_value;
  68
  69
  70 typedef vec<histogram_value> histogram_values;
  71
  72 extern void gimple_find_values_to_profile (histogram_values *);
  73 extern bool gimple_value_profile_transformations (void);
  74
  75 histogram_value gimple_alloc_histogram_value (struct function *, enum hist_type,
  76                                               gimple *stmt = NULL,
  77                                               tree value = NULL_TREE);
  78 histogram_value gimple_histogram_value (struct function *, gimple *);
  79 histogram_value gimple_histogram_value_of_type (struct function *, gimple *,
  80                                                 enum hist_type);
  81 void gimple_add_histogram_value (struct function *, gimple *, histogram_value);
  82 void dump_histograms_for_stmt (struct function *, FILE *, gimple *);
  83 void gimple_remove_histogram_value (struct function *, gimple *, histogram_value);
  84 void gimple_remove_stmt_histograms (struct function *, gimple *);
  85 void gimple_duplicate_stmt_histograms (struct function *, gimple *,
  86                                        struct function *, gimple *);
  87 void gimple_move_stmt_histograms (struct function *, gimple *, gimple *);
  88 void verify_histograms (void);
  89 void free_histograms (function *);
  90 void stringop_block_profile (gimple *, unsigned int *, HOST_WIDE_INT *);
  91 gcall *gimple_ic (gcall *, struct cgraph_node *, profile_probability);
  92 bool get_nth_most_common_value (gimple *stmt, const char *counter_type,
  93                                 histogram_value hist, gcov_type *value,
  94                                 gcov_type *count, gcov_type *all,
  95                                 unsigned n = 0);
  96
  97 /* In tree-profile.c.  */
  98 extern void gimple_init_gcov_profiler (void);
  99 extern void gimple_gen_edge_profiler (int, edge);
 100 extern void gimple_gen_interval_profiler (histogram_value, unsigned);
 101 extern void gimple_gen_pow2_profiler (histogram_value, unsigned);
 102 extern void gimple_gen_topn_values_profiler (histogram_value, unsigned);
 103 extern void gimple_gen_ic_profiler (histogram_value, unsigned);
 104 extern void gimple_gen_ic_func_profiler (void);
 105 extern void gimple_gen_time_profiler (unsigned);
 106 extern void gimple_gen_average_profiler (histogram_value, unsigned);
 107 extern void gimple_gen_ior_profiler (histogram_value, unsigned);
 108 extern void stream_out_histogram_value (struct output_block *, histogram_value);
 109 extern void stream_in_histogram_value (class lto_input_block *, gimple *);
 110 extern struct cgraph_node* find_func_by_profile_id (int func_id);
 111
 112
 113 /* In profile.c.  */
 114 extern void init_branch_prob (void);
 115 extern void branch_prob (bool);
 116 extern void read_thunk_profile (struct cgraph_node *);
 117 extern void end_branch_prob (void);
 118
 119 #endif  /* GCC_VALUE_PROF_H */
 120