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1 /* Definitions for transformations based on profile information for values.
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2 Copyright (C) 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #ifndef GCC_VALUE_PROF_H
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21 #define GCC_VALUE_PROF_H
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22
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23 /* Supported histogram types. */
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24 enum hist_type
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25 {
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26 HIST_TYPE_INTERVAL, /* Measures histogram of values inside a specified
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27 interval. */
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28 HIST_TYPE_POW2, /* Histogram of power of 2 values. */
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29 HIST_TYPE_SINGLE_VALUE, /* Tries to identify the value that is (almost)
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30 always constant. */
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31 HIST_TYPE_CONST_DELTA, /* Tries to identify the (almost) always constant
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32 difference between two evaluations of a value. */
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33 HIST_TYPE_INDIR_CALL, /* Tries to identify the function that is (almost)
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34 called in indirect call */
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35 HIST_TYPE_AVERAGE, /* Compute average value (sum of all values). */
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36 HIST_TYPE_IOR /* Used to compute expected alignment. */
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37 };
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38
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39 #define COUNTER_FOR_HIST_TYPE(TYPE) ((int) (TYPE) + GCOV_FIRST_VALUE_COUNTER)
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40 #define HIST_TYPE_FOR_COUNTER(COUNTER) \
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41 ((enum hist_type) ((COUNTER) - GCOV_FIRST_VALUE_COUNTER))
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42
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43 /* The value to measure. */
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44 struct histogram_value_t
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45 {
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46 struct
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47 {
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48 tree value; /* The value to profile. */
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49 gimple stmt; /* Insn containing the value. */
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50 gcov_type *counters; /* Pointer to first counter. */
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51 struct histogram_value_t *next; /* Linked list pointer. */
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52 } hvalue;
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53 enum hist_type type; /* Type of information to measure. */
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54 unsigned n_counters; /* Number of required counters. */
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55 union
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56 {
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57 struct
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58 {
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59 int int_start; /* First value in interval. */
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60 unsigned int steps; /* Number of values in it. */
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61 } intvl; /* Interval histogram data. */
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62 } hdata; /* Profiled information specific data. */
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63 };
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64
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65 typedef struct histogram_value_t *histogram_value;
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66 typedef const struct histogram_value_t *const_histogram_value;
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67
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68 DEF_VEC_P(histogram_value);
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69 DEF_VEC_ALLOC_P(histogram_value,heap);
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70
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71 typedef VEC(histogram_value,heap) *histogram_values;
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72
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73 /* Hooks registration. */
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74 extern void gimple_register_value_prof_hooks (void);
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75
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76 /* IR-independent entry points. */
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77 extern void find_values_to_profile (histogram_values *);
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78 extern bool value_profile_transformations (void);
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79
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80 /* External declarations for edge-based profiling. */
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81 struct profile_hooks {
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82
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83 /* Insert code to initialize edge profiler. */
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84 void (*init_edge_profiler) (void);
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85
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86 /* Insert code to increment an edge count. */
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87 void (*gen_edge_profiler) (int, edge);
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88
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89 /* Insert code to increment the interval histogram counter. */
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90 void (*gen_interval_profiler) (histogram_value, unsigned, unsigned);
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91
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92 /* Insert code to increment the power of two histogram counter. */
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93 void (*gen_pow2_profiler) (histogram_value, unsigned, unsigned);
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94
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95 /* Insert code to find the most common value. */
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96 void (*gen_one_value_profiler) (histogram_value, unsigned, unsigned);
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97
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98 /* Insert code to find the most common value of a difference between two
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99 evaluations of an expression. */
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100 void (*gen_const_delta_profiler) (histogram_value, unsigned, unsigned);
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101
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102 /* Insert code to find the most common indirect call */
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103 void (*gen_ic_profiler) (histogram_value, unsigned, unsigned);
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104
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105 /* Insert code to find the average value of an expression. */
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106 void (*gen_average_profiler) (histogram_value, unsigned, unsigned);
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107
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108 /* Insert code to ior value of an expression. */
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109 void (*gen_ior_profiler) (histogram_value, unsigned, unsigned);
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110 };
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111
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112 histogram_value gimple_histogram_value (struct function *, gimple);
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113 histogram_value gimple_histogram_value_of_type (struct function *, gimple,
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114 enum hist_type);
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115 void gimple_add_histogram_value (struct function *, gimple, histogram_value);
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116 void dump_histograms_for_stmt (struct function *, FILE *, gimple);
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117 void gimple_remove_histogram_value (struct function *, gimple, histogram_value);
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118 void gimple_remove_stmt_histograms (struct function *, gimple);
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119 void gimple_duplicate_stmt_histograms (struct function *, gimple,
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120 struct function *, gimple);
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121 void gimple_move_stmt_histograms (struct function *, gimple, gimple);
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122 void verify_histograms (void);
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123 void free_histograms (void);
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124 void stringop_block_profile (gimple, unsigned int *, HOST_WIDE_INT *);
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125
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126 /* In profile.c. */
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127 extern void init_branch_prob (void);
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128 extern void branch_prob (void);
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129 extern void end_branch_prob (void);
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130 extern void tree_register_profile_hooks (void);
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131
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132 /* In tree-profile.c. */
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133 extern struct profile_hooks tree_profile_hooks;
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134
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135 #endif /* GCC_VALUE_PROF_H */
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136
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