gcc/params.h

   1 /* params.h - Run-time parameters.
   2    Copyright (C) 2001, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
   3    Written by Mark Mitchell <mark@codesourcery.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 /* This module provides a means for setting integral parameters
  22    dynamically.  Instead of encoding magic numbers in various places,
  23    use this module to organize all the magic numbers in a single
  24    place.  The values of the parameters can be set on the
  25    command-line, thereby providing a way to control the amount of
  26    effort spent on particular optimization passes, or otherwise tune
  27    the behavior of the compiler.
  28
  29    Since their values can be set on the command-line, these parameters
  30    should not be used for non-dynamic memory allocation.  */
  31
  32 #ifndef GCC_PARAMS_H
  33 #define GCC_PARAMS_H
  34
  35 /* No parameter shall have this value.  */
  36
  37 #define INVALID_PARAM_VAL (-1)
  38
  39 /* The information associated with each parameter.  */
  40
  41 typedef struct param_info
  42 {
  43   /* The name used with the `--param <name>=<value>' switch to set this
  44      value.  */
  45   const char *const option;
  46   /* The associated value.  */
  47   int value;
  48
  49   /* Minimum acceptable value.  */
  50   int min_value;
  51
  52   /* Maximum acceptable value, if greater than minimum  */
  53   int max_value;
  54
  55   /* A short description of the option.  */
  56   const char *const help;
  57 } param_info;
  58
  59 /* An array containing the compiler parameters and their current
  60    values.  */
  61
  62 extern param_info *compiler_params;
  63
  64 /* Add the N PARAMS to the current list of compiler parameters.  */
  65
  66 extern void add_params (const param_info params[], size_t n);
  67
  68 /* Set the VALUE associated with the parameter given by NAME.  */
  69
  70 extern void set_param_value (const char *name, int value);
  71
  72 \f
  73 /* The parameters in use by language-independent code.  */
  74
  75 typedef enum compiler_param
  76 {
  77 #define DEFPARAM(enumerator, option, msgid, default, min, max) \
  78   enumerator,
  79 #include "params.def"
  80 #undef DEFPARAM
  81   LAST_PARAM
  82 } compiler_param;
  83
  84 /* The value of the parameter given by ENUM.  */
  85 #define PARAM_VALUE(ENUM) \
  86   (compiler_params[(int) ENUM].value)
  87
  88 /* Macros for the various parameters.  */
  89 #define SALIAS_MAX_IMPLICIT_FIELDS \
  90   PARAM_VALUE (PARAM_SALIAS_MAX_IMPLICIT_FIELDS)
  91 #define SALIAS_MAX_ARRAY_ELEMENTS \
  92   PARAM_VALUE (PARAM_SALIAS_MAX_ARRAY_ELEMENTS)
  93 #define SRA_MAX_STRUCTURE_SIZE \
  94   PARAM_VALUE (PARAM_SRA_MAX_STRUCTURE_SIZE)
  95 #define SRA_MAX_STRUCTURE_COUNT \
  96   PARAM_VALUE (PARAM_SRA_MAX_STRUCTURE_COUNT)
  97 #define SRA_FIELD_STRUCTURE_RATIO \
  98   PARAM_VALUE (PARAM_SRA_FIELD_STRUCTURE_RATIO)
  99 #define MAX_INLINE_INSNS_SINGLE \
 100   PARAM_VALUE (PARAM_MAX_INLINE_INSNS_SINGLE)
 101 #define MAX_INLINE_INSNS \
 102   PARAM_VALUE (PARAM_MAX_INLINE_INSNS)
 103 #define MAX_INLINE_SLOPE \
 104   PARAM_VALUE (PARAM_MAX_INLINE_SLOPE)
 105 #define MIN_INLINE_INSNS \
 106   PARAM_VALUE (PARAM_MIN_INLINE_INSNS)
 107 #define MAX_INLINE_INSNS_AUTO \
 108   PARAM_VALUE (PARAM_MAX_INLINE_INSNS_AUTO)
 109 #define MAX_VARIABLE_EXPANSIONS \
 110   PARAM_VALUE (PARAM_MAX_VARIABLE_EXPANSIONS)
 111 #define MAX_DELAY_SLOT_INSN_SEARCH \
 112   PARAM_VALUE (PARAM_MAX_DELAY_SLOT_INSN_SEARCH)
 113 #define MAX_DELAY_SLOT_LIVE_SEARCH \
 114   PARAM_VALUE (PARAM_MAX_DELAY_SLOT_LIVE_SEARCH)
 115 #define MAX_PENDING_LIST_LENGTH \
 116   PARAM_VALUE (PARAM_MAX_PENDING_LIST_LENGTH)
 117 #define MAX_GCSE_MEMORY \
 118   ((size_t) PARAM_VALUE (PARAM_MAX_GCSE_MEMORY))
 119 #define MAX_GCSE_PASSES \
 120   PARAM_VALUE (PARAM_MAX_GCSE_PASSES)
 121 #define GCSE_AFTER_RELOAD_PARTIAL_FRACTION \
 122   PARAM_VALUE (PARAM_GCSE_AFTER_RELOAD_PARTIAL_FRACTION)
 123 #define GCSE_AFTER_RELOAD_CRITICAL_FRACTION \
 124   PARAM_VALUE (PARAM_GCSE_AFTER_RELOAD_CRITICAL_FRACTION)
 125 #define MAX_UNROLLED_INSNS \
 126   PARAM_VALUE (PARAM_MAX_UNROLLED_INSNS)
 127 #define MAX_SMS_LOOP_NUMBER \
 128   PARAM_VALUE (PARAM_MAX_SMS_LOOP_NUMBER)
 129 #define SMS_MAX_II_FACTOR \
 130   PARAM_VALUE (PARAM_SMS_MAX_II_FACTOR)
 131 #define SMS_DFA_HISTORY \
 132   PARAM_VALUE (PARAM_SMS_DFA_HISTORY)
 133 #define SMS_LOOP_AVERAGE_COUNT_THRESHOLD \
 134   PARAM_VALUE (PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD)
 135 #define GLOBAL_VAR_THRESHOLD \
 136   PARAM_VALUE (PARAM_GLOBAL_VAR_THRESHOLD)
 137 #define MAX_ALIASED_VOPS \
 138   PARAM_VALUE (PARAM_MAX_ALIASED_VOPS)
 139 #define INTEGER_SHARE_LIMIT \
 140   PARAM_VALUE (PARAM_INTEGER_SHARE_LIMIT)
 141 #define MAX_LAST_VALUE_RTL \
 142   PARAM_VALUE (PARAM_MAX_LAST_VALUE_RTL)
 143 #define MIN_VIRTUAL_MAPPINGS \
 144   PARAM_VALUE (PARAM_MIN_VIRTUAL_MAPPINGS)
 145 #define VIRTUAL_MAPPINGS_TO_SYMS_RATIO \
 146   PARAM_VALUE (PARAM_VIRTUAL_MAPPINGS_TO_SYMS_RATIO)
 147 #define MAX_FIELDS_FOR_FIELD_SENSITIVE \
 148   ((size_t) PARAM_VALUE (PARAM_MAX_FIELDS_FOR_FIELD_SENSITIVE))
 149 #define MAX_SCHED_READY_INSNS \
 150   PARAM_VALUE (PARAM_MAX_SCHED_READY_INSNS)
 151 #endif /* ! GCC_PARAMS_H */