1 /* Definitions for transformations based on profile information for values. 2 Copyright (C) 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301, 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 struct histogram_value_t 42 { 43 struct 44 { 45 tree value; /* The value to profile. */ 46 tree stmt; /* Insn containing the value. */ 47 gcov_type *counters; /* Pointer to first counter. */ 48 struct histogram_value_t *next; /* Linked list pointer. */ 49 } hvalue; 50 enum hist_type type; /* Type of information to measure. */ 51 unsigned n_counters; /* Number of required counters. */ 52 union 53 { 54 struct 55 { 56 int int_start; /* First value in interval. */ 57 unsigned int steps; /* Number of values in it. */ 58 } intvl; /* Interval histogram data. */ 59 } hdata; /* Profiled information specific data. */ 60 }; 61 62 typedef struct histogram_value_t *histogram_value; 63 64 DEF_VEC_P(histogram_value); 65 DEF_VEC_ALLOC_P(histogram_value,heap); 66 67 typedef VEC(histogram_value,heap) *histogram_values; 68 69 /* Hooks registration. */ 70 extern void tree_register_value_prof_hooks (void); 71 72 /* IR-independent entry points. */ 73 extern void find_values_to_profile (histogram_values *); 74 extern bool value_profile_transformations (void); 75 76 /* External declarations for edge-based profiling. */ 77 struct profile_hooks { 78 79 /* Insert code to initialize edge profiler. */ 80 void (*init_edge_profiler) (void); 81 82 /* Insert code to increment an edge count. */ 83 void (*gen_edge_profiler) (int, edge); 84 85 /* Insert code to increment the interval histogram counter. */ 86 void (*gen_interval_profiler) (histogram_value, unsigned, unsigned); 87 88 /* Insert code to increment the power of two histogram counter. */ 89 void (*gen_pow2_profiler) (histogram_value, unsigned, unsigned); 90 91 /* Insert code to find the most common value. */ 92 void (*gen_one_value_profiler) (histogram_value, unsigned, unsigned); 93 94 /* Insert code to find the most common value of a difference between two 95 evaluations of an expression. */ 96 void (*gen_const_delta_profiler) (histogram_value, unsigned, unsigned); 97 }; 98 99 /* In profile.c. */ 100 extern void init_branch_prob (void); 101 extern void branch_prob (void); 102 extern void end_branch_prob (void); 103 extern void tree_register_profile_hooks (void); 104 105 /* In tree-profile.c. */ 106 extern struct profile_hooks tree_profile_hooks; 107 108 #endif /* GCC_VALUE_PROF_H */ 109 110