gcc/value-prof.h

   1 /* Definitions for transformations based on profile information for values.
   2    Copyright (C) 2003 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, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, 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 /* The void *'s are either rtx or tree, depending on which IR is in use.  */
  42 struct histogram_value_t GTY(())
  43 {
  44   PTR GTY ((skip (""))) value;          /* The value to profile.  */
  45   enum machine_mode mode;               /* And its mode.  */
  46   PTR GTY ((skip (""))) seq;            /* Insns required to count the
  47                                            profiled value.  */
  48   PTR GTY ((skip (""))) insn;           /* Insn before that to measure.  */
  49   enum hist_type type;                  /* Type of information to measure.  */
  50   unsigned n_counters;                  /* Number of required counters.  */
  51   union
  52     {
  53       struct
  54         {
  55           int int_start;        /* First value in interval.  */
  56           int steps;            /* Number of values in it.  */
  57           int may_be_less;      /* May the value be below?  */
  58           int may_be_more;      /* Or above.  */
  59         } intvl;        /* Interval histogram data.  */
  60       struct
  61         {
  62           int may_be_other;     /* If the value may be non-positive or not 2^k.  */
  63         } pow2;         /* Power of 2 histogram data.  */
  64     } hdata;            /* Profiled information specific data.  */
  65 };
  66
  67 typedef struct histogram_value_t *histogram_value;
  68
  69 DEF_VEC_GC_P(histogram_value);
  70
  71 typedef VEC(histogram_value) *histogram_values;
  72
  73 /* Hooks registration.  */
  74 extern void rtl_register_value_prof_hooks (void);
  75 extern void tree_register_value_prof_hooks (void);
  76
  77 /* IR-independent entry points.  */
  78 extern void find_values_to_profile (histogram_values *);
  79 extern bool value_profile_transformations (void);
  80 \f
  81 /* External declarations for edge-based profiling.  */
  82 struct profile_hooks {
  83   /* Insert code to increment an edge count.  */
  84   void (*gen_edge_profiler) (int, edge);
  85
  86   /* Insert code to increment the interval histogram counter.  */
  87   void (*gen_interval_profiler) (histogram_value, unsigned, unsigned);
  88
  89   /* Insert code to increment the power of two histogram counter.  */
  90   void (*gen_pow2_profiler) (histogram_value, unsigned, unsigned);
  91
  92   /* Insert code to find the most common value.  */
  93   void (*gen_one_value_profiler) (histogram_value, unsigned, unsigned);
  94
  95   /* Insert code to find the most common value of a difference between two
  96      evaluations of an expression.  */
  97   void (*gen_const_delta_profiler) (histogram_value, unsigned, unsigned);
  98   FILE * (*profile_dump_file) (void);
  99 };
 100
 101 /* In profile.c.  */
 102 extern void init_branch_prob (void);
 103 extern void branch_prob (void);
 104 extern void end_branch_prob (void);
 105 extern void tree_register_profile_hooks (void);
 106 extern void rtl_register_profile_hooks (void);
 107
 108 /* In tree-profile.c.  */
 109 extern struct profile_hooks tree_profile_hooks;
 110
 111 /* In rtl-profile.c.  */
 112 extern struct profile_hooks rtl_profile_hooks;
 113
 114 #endif  /* GCC_VALUE_PROF_H */
 115