1 /* Definitions for transformations based on profile information for values. 2 Copyright (C) 2003, 2004, 2005, 2007, 2008 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 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 */ 136 137