gcc/params.def

   1 /* params.def - Run-time parameters.
   2    Copyright (C) 2001 Free Software Foundation, Inc.
   3    Written by Mark Mitchell <mark@codesourcery.com>.
   4
   5 This file is part of GNU CC.
   6
   7 GNU CC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU CC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU CC; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.
  21
  22 */
  23
  24 /* This file contains definitions for language-independent
  25    parameters.  The DEFPARAM macro takes 4 arguments:
  26
  27      - The enumeral corresponding to this parameter.
  28
  29      - The name that can be used to set this parameter using the
  30        command-line option `--param <name>=<value>'.
  31
  32      - A help string explaining how the parameter is used.
  33
  34      - A default value for the parameter.  */
  35
  36 /* The maximum number of instructions accepted for inlining a
  37    function.  Increasing values mean more agressive inlining.
  38    This affects currently only functions explicitly marked as
  39    inline (or methods defined within the class definition for C++).
  40    The default value of 10000 is arbitrary but high to match the
  41    previously unlimited gcc capabilities.  */
  42 DEFPARAM (PARAM_MAX_INLINE_INSNS,
  43           "max-inline-insns",
  44           "The maximum number of instructions in a function that is eligible for inlining",
  45           10000)
  46
  47 /* The maximum number of instructions to consider when looking for an
  48    instruction to fill a delay slot.  If more than this arbitrary
  49    number of instructions is searched, the time savings from filling
  50    the delay slot will be minimal so stop searching.  Increasing
  51    values mean more aggressive optimization, making the compile time
  52    increase with probably small improvement in executable run time.  */
  53 DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,
  54           "max-delay-slot-insn-search",
  55           "The maximum number of instructions to consider to fill a delay slot",
  56           100)
  57
  58 /* When trying to fill delay slots, the maximum number of instructions
  59    to consider when searching for a block with valid live register
  60    information.  Increasing this arbitrarily chosen value means more
  61    aggressive optimization, increasing the compile time.  This
  62    parameter should be removed when the delay slot code is rewritten
  63    to maintain the control-flow graph.  */
  64 DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,
  65          "max-delay-slot-live-search",
  66          "The maximum number of instructions to consider to find accurate live register information",
  67          333)
  68
  69 /* The GCSE optimization will be disabled if it would require
  70    significantly more memory than this value.  */
  71 DEFPARAM(PARAM_MAX_GCSE_MEMORY,
  72          "max-gcse-memory",
  73          "The maximum amount of memory to be allocated by GCSE",
  74          50 * 1024 * 1024)
  75
  76 /*
  77 Local variables:
  78 mode:c
  79 End: */