* Makefile.in, alias.c, basic-block.h, bb-reorder.c, bitmap.c,

[thirdparty/gcc.git] / gcc / params.def

/* params.def - Run-time parameters.
   Copyright (C) 2001 Free Software Foundation, Inc.
   Written by Mark Mitchell <mark@codesourcery.com>.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.

*/

/* This file contains definitions for language-independent
   parameters.  The DEFPARAM macro takes 4 arguments:

     - The enumeral corresponding to this parameter.

     - The name that can be used to set this parameter using the 
       command-line option `--param <name>=<value>'.

     - A help string explaining how the parameter is used.

     - A default value for the parameter.

   Be sure to add an entry to invoke.texi summarizing the parameter.  */

/* The maximum number of instructions accepted for inlining a
   function.  Increasing values mean more agressive inlining.
   This affects currently only functions explicitly marked as
   inline (or methods defined within the class definition for C++).
   The original default value of 10000 was arbitrary and caused
   significant compile-time performance regressions.  */
DEFPARAM (PARAM_MAX_INLINE_INSNS,
	  "max-inline-insns",
	  "The maximum number of instructions in a function that is eligible for inlining",
	  600)

/* The maximum number of instructions to consider when looking for an
   instruction to fill a delay slot.  If more than this arbitrary
   number of instructions is searched, the time savings from filling
   the delay slot will be minimal so stop searching.  Increasing
   values mean more aggressive optimization, making the compile time
   increase with probably small improvement in executable run time.  */
DEFPARAM (PARAM_MAX_DELAY_SLOT_INSN_SEARCH,
	  "max-delay-slot-insn-search",
	  "The maximum number of instructions to consider to fill a delay slot",
	  100)

/* When trying to fill delay slots, the maximum number of instructions
   to consider when searching for a block with valid live register
   information.  Increasing this arbitrarily chosen value means more
   aggressive optimization, increasing the compile time.  This
   parameter should be removed when the delay slot code is rewritten
   to maintain the control-flow graph.  */
DEFPARAM(PARAM_MAX_DELAY_SLOT_LIVE_SEARCH,
	 "max-delay-slot-live-search",
	 "The maximum number of instructions to consider to find accurate live register information",
	 333)

/* This parameter limits the number of branch elements that the 
   scheduler will track anti-dependancies through without resetting
   the tracking mechanism.  Large functions with few calls or barriers 
   can generate lists containing many 1000's of dependancies.  Generally 
   the compiler either uses all available memory, or runs for far too long.  */
DEFPARAM(PARAM_MAX_PENDING_LIST_LENGTH,
	 "max-pending-list-length",
	 "The maximum length of scheduling's pending operations list",
	 32)

/* The GCSE optimization will be disabled if it would require
   significantly more memory than this value.  */
DEFPARAM(PARAM_MAX_GCSE_MEMORY,
	 "max-gcse-memory",
	 "The maximum amount of memory to be allocated by GCSE",
	 50 * 1024 * 1024)
/* The number of repetitions of copy/const prop and PRE to run. */
DEFPARAM(PARAM_MAX_GCSE_PASSES,
	"max-gcse-passes",
	"The maximum number of passes to make when doing GCSE",
	1)
/*
Local variables:
mode:c
End: */