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    Be sure to add an entry to invoke.texi summarizing the parameter.  */
  37
  38 /* The maximum number of instructions accepted for inlining a
  39    function.  Increasing values mean more agressive inlining.
  40    This affects currently only functions explicitly marked as
  41    inline (or methods defined within the class definition for C++).
  42    The original default value of 10000 was arbitrary and caused
  43    significant compile-time performance regressions.  */
  44 DEFPARAM (PARAM_MAX_INLINE_INSNS,
  45           "max-inline-insns",
  46           "The maximum number of instructions in a function that is eligible for inlining",
  47           600)
  48
  49 /* The maximum number of instructions to consider when looking for an
  50    instruction to fill a delay slot.  If more than this arbitrary
  51    number of instructions is searched, the time savings from filling
  52    the delay slot will be minimal so stop searching.  Increasing
  53    values mean more aggressive optimization, making the compile time
  54    increase with probably small improvement in executable run time.  */
  55 DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,
  56           "max-delay-slot-insn-search",
  57           "The maximum number of instructions to consider to fill a delay slot",
  58           100)
  59
  60 /* When trying to fill delay slots, the maximum number of instructions
  61    to consider when searching for a block with valid live register
  62    information.  Increasing this arbitrarily chosen value means more
  63    aggressive optimization, increasing the compile time.  This
  64    parameter should be removed when the delay slot code is rewritten
  65    to maintain the control-flow graph.  */
  66 DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,
  67          "max-delay-slot-live-search",
  68          "The maximum number of instructions to consider to find accurate live register information",
  69          333)
  70
  71 /* The GCSE optimization will be disabled if it would require
  72    significantly more memory than this value.  */
  73 DEFPARAM(PARAM_MAX_GCSE_MEMORY,
  74          "max-gcse-memory",
  75          "The maximum amount of memory to be allocated by GCSE",
  76          50 * 1024 * 1024)
  77
  78 /* This parameter limits the number of branch elements that the
  79    scheduler will track anti-dependancies through without resetting
  80    the tracking mechanism.  Large functions with few calls or barriers
  81    can generate lists containing many 1000's of dependancies.  Generally
  82    the compiler either uses all available memory, or runs for far too long.  */
  83 DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,
  84          "max-pending-list-length",
  85          "The maximum length of scheduling's pending operations list",
  86          32)
  87
  88 /*
  89 Local variables:
  90 mode:c
  91 End: */