5c856b2368
* Makefile.in (tracer.o): New. * params.def (TRACER_*): New options. * rtl.h (tracer): Declare. * timevar.def (TV_TRACER): New. * toplev.c (dump_file_index): Add DFI_tracer. (dump_file_info): Add tracer. (flag_tracer): New. (lang_indepdenent_options): Add tracer. (rest_of_compilation): Call tracer. * tracer.c: New file. * invoke.texi (-ftracer): Document. (--param tracer-*): Document. From-SVN: r54154
197 lines
8.4 KiB
Modula-2
197 lines
8.4 KiB
Modula-2
/* 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 single function inlining limit. This is the maximum size
|
|
of a function counted in internal gcc instructions (not in
|
|
real machine instructions) that is eligible for inlining
|
|
by the tree inliner.
|
|
The default value is 300.
|
|
Only functions marked inline (or methods defined in the class
|
|
definition for C++) are affected by this, unless you set the
|
|
-finline-functions (included in -O3) compiler option.
|
|
There are more restrictions to inlining: If inlined functions
|
|
call other functions, the already inlined instructions are
|
|
counted and once the recursive inline limit (see
|
|
"max-inline-insns" parameter) is exceeded, the acceptable size
|
|
gets decreased. */
|
|
DEFPARAM (PARAM_MAX_INLINE_INSNS_SINGLE,
|
|
"max-inline-insns-single",
|
|
"The maximum number of instructions in a single function eliglible for inlining",
|
|
300)
|
|
|
|
/* The repeated inlining limit. After this number of instructions
|
|
(in the internal gcc representation, not real machine instructions)
|
|
got inlined by repeated inlining, gcc starts to decrease the maximum
|
|
number of inlinable instructions in the tree inliner.
|
|
This is done by a linear function, see "max-inline-slope" parameter.
|
|
It is necessary in order to limit the compile-time resources, that
|
|
could otherwise become very high.
|
|
It is recommended to set this value to twice the value of the single
|
|
function limit (set by the "max-inline-insns-single" parameter) or
|
|
higher. The default value is 600.
|
|
Higher values mean that more inlining is done, resulting in
|
|
better performance of the code, at the expense of higher
|
|
compile-time resource (time, memory) requirements and larger
|
|
binaries.
|
|
This parameters also controls the maximum size of functions considered
|
|
for inlining in the RTL inliner. */
|
|
DEFPARAM (PARAM_MAX_INLINE_INSNS,
|
|
"max-inline-insns",
|
|
"The maximuem number of instructions by repeated inlining before gcc starts to throttle inlining",
|
|
600)
|
|
|
|
/* After the repeated inline limit has been exceeded (see
|
|
"max-inline-insns" parameter), a linear function is used to
|
|
decrease the size of single functions eligible for inlining.
|
|
The slope of this linear function is given the negative
|
|
reciprocal value (-1/x) of this parameter.
|
|
The default vlue is 32.
|
|
This linear function is used until it falls below a minimum
|
|
value specified by the "min-inline-insns" parameter. */
|
|
DEFPARAM (PARAM_MAX_INLINE_SLOPE,
|
|
"max-inline-slope",
|
|
"The slope of the linear funtion throttling inlining after the recursive inlining limit has been reached is given by the negative reciprocal value of this parameter",
|
|
32)
|
|
|
|
/* When gcc has inlined so many instructions (by repeated
|
|
inlining) that the throttling limits the inlining very much,
|
|
inlining for very small functions is still desirable to
|
|
achieve good runtime performance. The size of single functions
|
|
(measured in gcc instructions) which will still be eligible for
|
|
inlining then is given by this parameter. It defaults to 130.
|
|
Only much later (after exceeding 128 times the recursive limit)
|
|
inlining is cut down completely. */
|
|
DEFPARAM (PARAM_MIN_INLINE_INSNS,
|
|
"min-inline-insns",
|
|
"The number of instructions in a single functions still eligible to inlining after a lot recursive inlining",
|
|
130)
|
|
|
|
/* 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-dependencies through without resetting
|
|
the tracking mechanism. Large functions with few calls or barriers
|
|
can generate lists containing many 1000's of dependencies. 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)
|
|
|
|
/* This parameter limits the number of insns in a loop that will be unrolled,
|
|
and by how much the loop is unrolled. */
|
|
DEFPARAM(PARAM_MAX_UNROLLED_INSNS,
|
|
"max-unrolled-insns",
|
|
"The maximum number of instructions to consider to unroll in a loop",
|
|
100)
|
|
|
|
DEFPARAM(HOT_BB_COUNT_FRACTION,
|
|
"hot-bb-count-fraction",
|
|
"Select fraction of the maximal count of repetitions of basic block in \
|
|
program given basic block needs to have to be considered hot",
|
|
10000)
|
|
DEFPARAM(HOT_BB_FREQUENCY_FRACTION,
|
|
"hot-bb-frequency-fraction",
|
|
"Select fraction of the maximal frequency of executions of basic \
|
|
block in function given basic block needs to have to be considered hot",
|
|
1000)
|
|
DEFPARAM(TRACER_DYNAMIC_COVERAGE_FEEDBACK,
|
|
"tracer-dynamic-coverage-feedback",
|
|
"The percentage of function, weighted by execution frequency, that \
|
|
must be covered by trace formation. Used when profile feedback is available",
|
|
95)
|
|
DEFPARAM(TRACER_DYNAMIC_COVERAGE,
|
|
"tracer-dynamic-coverage",
|
|
"The percentage of function, weighted by execution frequency, that \
|
|
must be covered by trace formation. Used when profile feedback is not available",
|
|
75)
|
|
DEFPARAM(TRACER_MAX_CODE_GROWTH,
|
|
"tracer-max-code-growth",
|
|
"Maximal code growth caused by tail duplication (in percents)",
|
|
100)
|
|
DEFPARAM(TRACER_MIN_BRANCH_RATIO,
|
|
"tracer-min-branch-ratio",
|
|
"Stop reverse growth if the reverse probability of best edge is less \
|
|
than this threshold (in percents)",
|
|
10)
|
|
DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY_FEEDBACK,
|
|
"tracer-min-branch-probability-feedback",
|
|
"Stop forward growth if the probability of best edge is less than \
|
|
this threshold (in percents). Used when profile feedback is available",
|
|
30)
|
|
DEFPARAM(TRACER_MIN_BRANCH_PROBABILITY,
|
|
"tracer-min-branch-probability",
|
|
"Stop forward growth if the probability of best edge is less than \
|
|
this threshold (in percents). Used when profile feedback is not available",
|
|
50)
|
|
/*
|
|
Local variables:
|
|
mode:c
|
|
End: */
|