OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Document all param values and remove defaults (PR middle-end/86078). 

2018-09-25  Martin Liska  <mliska@suse.cz>

	PR middle-end/86078
	* doc/invoke.texi: Document all parameters and remove default
	of the parameters.
2018-09-25  Martin Liska  <mliska@suse.cz>

	PR middle-end/86078
	* check-params-in-docs.py: New file.

From-SVN: r264558
This commit is contained in:
Martin Liska 2018-09-25 09:08:44 +02:00 committed by Martin Liska
parent d5c4f75ddb
commit 4cac9d00e9
4 changed files with 296 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
contrib/ChangeLog
View File

@ -1,3 +1,8 @@
2018-09-25 Martin Liska <mliska@suse.cz>
PR middle-end/86078
* check-params-in-docs.py: New file.
2018-08-17 Jojo <jijie_rong@c-sky.com>
Huibin Wang <huibin_wang@c-sky.com>
Sandra Loosemore <sandra@codesourcery.com>

76
contrib/check-params-in-docs.py Executable file
View File

@ -0,0 +1,76 @@
#!/usr/bin/env python3
#
# Find missing and extra parameters in documentation compared to
# output of: gcc --help=params.
#
# 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 3, 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 COPYING3. If not see
# <http://www.gnu.org/licenses/>. */
#
#
#
import sys
import json
import argparse
from itertools import *
def get_param_tuple(line):
line = line.strip()
i = line.find(' ')
return (line[:i], line[i:].strip())
parser = argparse.ArgumentParser()
parser.add_argument('texi_file')
parser.add_argument('params_output')
args = parser.parse_args()
params = {}
for line in open(args.params_output).readlines():
if line.startswith(' '):
r = get_param_tuple(line)
params[r[0]] = r[1]
# Find section in .texi manual with parameters
texi = ([x.strip() for x in open(args.texi_file).readlines()])
texi = dropwhile(lambda x: not 'item --param' in x, texi)
texi = takewhile(lambda x: not '@node Instrumentation Options' in x, texi)
texi = list(texi)[1:]
token = '@item '
texi = [x[len(token):] for x in texi if x.startswith(token)]
sorted_texi = sorted(texi)
texi_set = set(texi)
params_set = set(params.keys())
extra = texi_set - params_set
if len(extra):
print('Extra:')
print(extra)
missing = params_set - texi_set
if len(missing):
print('Missing:')
for m in missing:
print('@item ' + m)
print(params[m])
print()
if texi != sorted_texi:
print('WARNING: not sorted alphabetically!')

6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2018-09-25 Martin Liska <mliska@suse.cz>
PR middle-end/86078
* doc/invoke.texi: Document all parameters and remove default
of the parameters.
2018-09-25 Ilya Leoshkevich <iii@linux.ibm.com>
PR bootstrap/87417

327
gcc/doc/invoke.texi
View File

@ -10428,19 +10428,22 @@ The names of specific parameters, and the meaning of the values, are
tied to the internals of the compiler, and are subject to change
without notice in future releases.
In order to get minimal, maximal and default value of a parameter,
one can use @option{--help=param -Q} options.
In each case, the @var{value} is an integer. The allowable choices for
@var{name} are:
@table @gcctabopt
@item predictable-branch-outcome
When branch is predicted to be taken with probability lower than this threshold
(in percent), then it is considered well predictable. The default is 10.
(in percent), then it is considered well predictable.
@item max-rtl-if-conversion-insns
RTL if-conversion tries to remove conditional branches around a block and
replace them with conditionally executed instructions. This parameter
gives the maximum number of instructions in a block which should be
considered for if-conversion. The default is 10, though the compiler will
considered for if-conversion. The compiler will
also use other heuristics to decide whether if-conversion is likely to be
profitable.
@ -10466,12 +10469,11 @@ probably small improvement in executable size.
The minimum number of instructions that must be matched at the end
of two blocks before cross-jumping is performed on them. This
value is ignored in the case where all instructions in the block being
cross-jumped from are matched. The default value is 5.
cross-jumped from are matched.
@item max-grow-copy-bb-insns
The maximum code size expansion factor when copying basic blocks
instead of jumping. The expansion is relative to a jump instruction.
The default value is 8.
@item max-goto-duplication-insns
The maximum number of instructions to duplicate to a block that jumps
@ -10479,7 +10481,7 @@ to a computed goto. To avoid @math{O(N^2)} behavior in a number of
passes, GCC factors computed gotos early in the compilation process,
and unfactors them as late as possible. Only computed jumps at the
end of a basic blocks with no more than max-goto-duplication-insns are
unfactored. The default value is 8.
unfactored.
@item max-delay-slot-insn-search
The maximum number of instructions to consider when looking for an
@ -10506,7 +10508,7 @@ optimization is not done.
@item max-gcse-insertion-ratio
If the ratio of expression insertions to deletions is larger than this value
for any expression, then RTL PRE inserts or removes the expression and thus
leaves partially redundant computations in the instruction stream. The default value is 20.
leaves partially redundant computations in the instruction stream.
@item max-pending-list-length
The maximum number of pending dependencies scheduling allows
@ -10525,7 +10527,6 @@ This number sets the maximum number of instructions (counted in GCC's
internal representation) in a single function that the tree inliner
considers for inlining. This only affects functions declared
inline and methods implemented in a class declaration (C++).
The default value is 400.
@item max-inline-insns-auto
When you use @option{-finline-functions} (included in @option{-O3}),
@ -10533,14 +10534,12 @@ a lot of functions that would otherwise not be considered for inlining
by the compiler are investigated. To those functions, a different
(more restrictive) limit compared to functions declared inline can
be applied.
The default value is 30.
@item inline-min-speedup
When estimated performance improvement of caller + callee runtime exceeds this
threshold (in percent), the function can be inlined regardless of the limit on
@option{--param max-inline-insns-single} and @option{--param
max-inline-insns-auto}.
The default value is 15.
@item large-function-insns
The limit specifying really large functions. For functions larger than this
@ -10548,11 +10547,10 @@ limit after inlining, inlining is constrained by
@option{--param large-function-growth}. This parameter is useful primarily
to avoid extreme compilation time caused by non-linear algorithms used by the
back end.
The default value is 2700.
@item large-function-growth
Specifies maximal growth of large function caused by inlining in percents.
The default value is 100 which limits large function growth to 2.0 times
For example, parameter value 100 limits large function growth to 2.0 times
the original size.
@item large-unit-insns
@ -10565,26 +10563,26 @@ A, the growth of unit is 300\% and yet such inlining is very sane. For very
large units consisting of small inlineable functions, however, the overall unit
growth limit is needed to avoid exponential explosion of code size. Thus for
smaller units, the size is increased to @option{--param large-unit-insns}
before applying @option{--param inline-unit-growth}. The default is 10000.
before applying @option{--param inline-unit-growth}.
@item inline-unit-growth
Specifies maximal overall growth of the compilation unit caused by inlining.
The default value is 20 which limits unit growth to 1.2 times the original
For example, parameter value 20 limits unit growth to 1.2 times the original
size. Cold functions (either marked cold via an attribute or by profile
feedback) are not accounted into the unit size.
@item ipcp-unit-growth
Specifies maximal overall growth of the compilation unit caused by
interprocedural constant propagation. The default value is 10 which limits
interprocedural constant propagation. For example, parameter value 10 limits
unit growth to 1.1 times the original size.
@item large-stack-frame
The limit specifying large stack frames. While inlining the algorithm is trying
to not grow past this limit too much. The default value is 256 bytes.
to not grow past this limit too much.
@item large-stack-frame-growth
Specifies maximal growth of large stack frames caused by inlining in percents.
The default value is 1000 which limits large stack frame growth to 11 times
For example, parameter value 1000 limits large stack frame growth to 11 times
the original size.
@item max-inline-insns-recursive
@ -10597,8 +10595,7 @@ function can grow into by performing recursive inlining.
declared inline.
For functions not declared inline, recursive inlining
happens only when @option{-finline-functions} (included in @option{-O3}) is
enabled; @option{--param max-inline-insns-recursive-auto} applies instead. The
default value is 450.
enabled; @option{--param max-inline-insns-recursive-auto} applies instead.
@item max-inline-recursive-depth
@itemx max-inline-recursive-depth-auto
@ -10607,8 +10604,7 @@ Specifies the maximum recursion depth used for recursive inlining.
@option{--param max-inline-recursive-depth} applies to functions
declared inline. For functions not declared inline, recursive inlining
happens only when @option{-finline-functions} (included in @option{-O3}) is
enabled; @option{--param max-inline-recursive-depth-auto} applies instead. The
default value is 8.
enabled; @option{--param max-inline-recursive-depth-auto} applies instead.
@item min-inline-recursive-probability
Recursive inlining is profitable only for function having deep recursion
@ -10620,12 +10616,10 @@ When profile feedback is available (see @option{-fprofile-generate}) the actual
recursion depth can be guessed from the probability that function recurses
via a given call expression. This parameter limits inlining only to call
expressions whose probability exceeds the given threshold (in percents).
The default value is 10.
@item early-inlining-insns
Specify growth that the early inliner can make. In effect it increases
the amount of inlining for code having a large abstraction penalty.
The default value is 14.
@item max-early-inliner-iterations
Limit of iterations of the early inliner. This basically bounds
@ -10634,20 +10628,19 @@ Deeper chains are still handled by late inlining.
@item comdat-sharing-probability
Probability (in percent) that C++ inline function with comdat visibility
are shared across multiple compilation units. The default value is 20.
are shared across multiple compilation units.
@item profile-func-internal-id
A parameter to control whether to use function internal id in profile
database lookup. If the value is 0, the compiler uses an id that
is based on function assembler name and filename, which makes old profile
data more tolerant to source changes such as function reordering etc.
The default value is 0.
@item min-vect-loop-bound
The minimum number of iterations under which loops are not vectorized
when @option{-ftree-vectorize} is used. The number of iterations after
vectorization needs to be greater than the value specified by this option
to allow vectorization. The default value is 0.
to allow vectorization.
@item gcse-cost-distance-ratio
Scaling factor in calculation of maximum distance an expression
@ -10655,7 +10648,7 @@ can be moved by GCSE optimizations. This is currently supported only in the
code hoisting pass. The bigger the ratio, the more aggressive code hoisting
is with simple expressions, i.e., the expressions that have cost
less than @option{gcse-unrestricted-cost}. Specifying 0 disables
hoisting of simple expressions. The default value is 10.
hoisting of simple expressions.
@item gcse-unrestricted-cost
Cost, roughly measured as the cost of a single typical machine
@ -10664,29 +10657,28 @@ the distance an expression can travel. This is currently
supported only in the code hoisting pass. The lesser the cost,
the more aggressive code hoisting is. Specifying 0
allows all expressions to travel unrestricted distances.
The default value is 3.
@item max-hoist-depth
The depth of search in the dominator tree for expressions to hoist.
This is used to avoid quadratic behavior in hoisting algorithm.
The value of 0 does not limit on the search, but may slow down compilation
of huge functions. The default value is 30.
of huge functions.
@item max-tail-merge-comparisons
The maximum amount of similar bbs to compare a bb with. This is used to
avoid quadratic behavior in tree tail merging. The default value is 10.
avoid quadratic behavior in tree tail merging.
@item max-tail-merge-iterations
The maximum amount of iterations of the pass over the function. This is used to
limit compilation time in tree tail merging. The default value is 2.
limit compilation time in tree tail merging.
@item store-merging-allow-unaligned
Allow the store merging pass to introduce unaligned stores if it is legal to
do so. The default value is 1.
do so.
@item max-stores-to-merge
The maximum number of stores to attempt to merge into wider stores in the store
merging pass. The minimum value is 2 and the default is 64.
merging pass.
@item max-unrolled-insns
The maximum number of instructions that a loop may have to be unrolled.
@ -10727,10 +10719,6 @@ The maximum number of insns of an unswitched loop.
@item max-unswitch-level
The maximum number of branches unswitched in a single loop.
@item max-loop-headers-insns
The maximum number of insns in loop header duplicated by the copy loop headers
pass.
@item lim-expensive
The minimum cost of an expensive expression in the loop invariant motion.
@ -10808,12 +10796,10 @@ loop without bounds appears artificially cold relative to the other one.
@item builtin-expect-probability
Control the probability of the expression having the specified value. This
parameter takes a percentage (i.e. 0 ... 100) as input.
The default probability of 90 is obtained empirically.
@item builtin-string-cmp-inline-length
The maximum length of a constant string for a builtin string cmp call
eligible for inlining.
The default value is 3.
@item align-threshold
@ -10863,27 +10849,23 @@ effective.
@item stack-clash-protection-guard-size
Specify the size of the operating system provided stack guard as
2 raised to @var{num} bytes. The default value is 12 (4096 bytes).
Acceptable values are between 12 and 30. Higher values may reduce the
2 raised to @var{num} bytes. Higher values may reduce the
number of explicit probes, but a value larger than the operating system
provided guard will leave code vulnerable to stack clash style attacks.
@item stack-clash-protection-probe-interval
Stack clash protection involves probing stack space as it is allocated. This
param controls the maximum distance between probes into the stack as 2 raised
to @var{num} bytes. Acceptable values are between 10 and 16 and defaults to
12. Higher values may reduce the number of explicit probes, but a value
to @var{num} bytes. Higher values may reduce the number of explicit probes, but a value
larger than the operating system provided guard will leave code vulnerable to
stack clash style attacks.
@item max-cse-path-length
The maximum number of basic blocks on path that CSE considers.
The default is 10.
@item max-cse-insns
The maximum number of instructions CSE processes before flushing.
The default is 1000.
@item ggc-min-expand
@ -10923,92 +10905,85 @@ to occur at every opportunity.
The maximum number of instruction reload should look backward for equivalent
register. Increasing values mean more aggressive optimization, making the
compilation time increase with probably slightly better performance.
The default value is 100.
@item max-cselib-memory-locations
The maximum number of memory locations cselib should take into account.
Increasing values mean more aggressive optimization, making the compilation time
increase with probably slightly better performance. The default value is 500.
increase with probably slightly better performance.
@item max-sched-ready-insns
The maximum number of instructions ready to be issued the scheduler should
consider at any given time during the first scheduling pass. Increasing
values mean more thorough searches, making the compilation time increase
with probably little benefit. The default value is 100.
with probably little benefit.
@item max-sched-region-blocks
The maximum number of blocks in a region to be considered for
interblock scheduling. The default value is 10.
interblock scheduling.
@item max-pipeline-region-blocks
The maximum number of blocks in a region to be considered for
pipelining in the selective scheduler. The default value is 15.
pipelining in the selective scheduler.
@item max-sched-region-insns
The maximum number of insns in a region to be considered for
interblock scheduling. The default value is 100.
interblock scheduling.
@item max-pipeline-region-insns
The maximum number of insns in a region to be considered for
pipelining in the selective scheduler. The default value is 200.
pipelining in the selective scheduler.
@item min-spec-prob
The minimum probability (in percents) of reaching a source block
for interblock speculative scheduling. The default value is 40.
for interblock speculative scheduling.
@item max-sched-extend-regions-iters
The maximum number of iterations through CFG to extend regions.
A value of 0 (the default) disables region extensions.
A value of 0 disables region extensions.
@item max-sched-insn-conflict-delay
The maximum conflict delay for an insn to be considered for speculative motion.
The default value is 3.
@item sched-spec-prob-cutoff
The minimal probability of speculation success (in percents), so that
speculative insns are scheduled.
The default value is 40.
@item sched-state-edge-prob-cutoff
The minimum probability an edge must have for the scheduler to save its
state across it.
The default value is 10.
@item sched-mem-true-dep-cost
Minimal distance (in CPU cycles) between store and load targeting same
memory locations. The default value is 1.
memory locations.
@item selsched-max-lookahead
The maximum size of the lookahead window of selective scheduling. It is a
depth of search for available instructions.
The default value is 50.
@item selsched-max-sched-times
The maximum number of times that an instruction is scheduled during
selective scheduling. This is the limit on the number of iterations
through which the instruction may be pipelined. The default value is 2.
through which the instruction may be pipelined.
@item selsched-insns-to-rename
The maximum number of best instructions in the ready list that are considered
for renaming in the selective scheduler. The default value is 2.
for renaming in the selective scheduler.
@item sms-min-sc
The minimum value of stage count that swing modulo scheduler
generates. The default value is 2.
generates.
@item max-last-value-rtl
The maximum size measured as number of RTLs that can be recorded in an expression
in combiner for a pseudo register as last known value of that register. The default
is 10000.
in combiner for a pseudo register as last known value of that register.
@item max-combine-insns
The maximum number of instructions the RTL combiner tries to combine.
The default value is 2 at @option{-Og} and 4 otherwise.
@item integer-share-limit
Small integer constants can use a shared data structure, reducing the
compiler's memory usage and increasing its speed. This sets the maximum
value of a shared integer constant. The default value is 256.
value of a shared integer constant.
@item ssp-buffer-size
The minimum size of buffers (i.e.@: arrays) that receive stack smashing
@ -11016,7 +10991,7 @@ protection when @option{-fstack-protection} is used.
@item min-size-for-stack-sharing
The minimum size of variables taking part in stack slot sharing when not
optimizing. The default value is 32.
optimizing.
@item max-jump-thread-duplication-stmts
Maximum number of statements allowed in a block that needs to be
@ -11024,9 +10999,7 @@ duplicated when threading jumps.
@item max-fields-for-field-sensitive
Maximum number of fields in a structure treated in
a field sensitive manner during pointer analysis. The default is zero
for @option{-O0} and @option{-O1},
and 100 for @option{-Os}, @option{-O2}, and @option{-O3}.
a field sensitive manner during pointer analysis.
@item prefetch-latency
Estimate on average number of instructions that are executed before
@ -11052,7 +11025,7 @@ for strides that are non-constant. In some cases this may be
beneficial, though the fact the stride is non-constant may make it
hard to predict when there is clear benefit to issuing these hints.
Set to 1, the default, if the prefetch hints should be issued for non-constant
Set to 1 if the prefetch hints should be issued for non-constant
strides. Set to 0 if prefetch hints should be issued only for strides that
are known to be constant and below @option{prefetch-minimum-stride}.
@ -11066,7 +11039,7 @@ the software prefetchers. If the hardware prefetchers have a maximum
stride they can handle, it should be used here to improve the use of
software prefetchers.
A value of -1, the default, means we don't have a threshold and therefore
A value of -1 means we don't have a threshold and therefore
prefetch hints can be issued for any constant stride.
This setting is only useful for strides that are known and constant.
@ -11086,8 +11059,8 @@ The minimum ratio between the number of instructions and the
number of memory references to enable prefetching in a loop.
@item use-canonical-types
Whether the compiler should use the ``canonical'' type system. By
default, this should always be 1, which uses a more efficient internal
Whether the compiler should use the ``canonical'' type system.
Should always be 1, which uses a more efficient internal
mechanism for comparing types in C++ and Objective-C++. However, if
bugs in the canonical type system are causing compilation failures,
set this value to 0 to disable canonical types.
@ -11108,11 +11081,10 @@ which prevents the runaway behavior. Setting a value of 0 for
this parameter allows an unlimited set length.
@item rpo-vn-max-loop-depth
Maximum loop depth that is value-numbered optimistically. The default
maximum loop depth is three. When the limit hits the innermost
Maximum loop depth that is value-numbered optimistically.
When the limit hits the innermost
@var{rpo-vn-max-loop-depth} loops and the outermost loop in the
loop nest are value-numbered optimistically and the remaining ones not.
The default maximum loop depth is seven.
@item sccvn-max-alias-queries-per-access
Maximum number of alias-oracle queries we perform when looking for
@ -11120,14 +11092,12 @@ redundancies for loads and stores. If this limit is hit the search
is aborted and the load or store is not considered redundant. The
number of queries is algorithmically limited to the number of
stores on all paths from the load to the function entry.
The default maximum number of queries is 1000.
@item ira-max-loops-num
IRA uses regional register allocation by default. If a function
contains more loops than the number given by this parameter, only at most
the given number of the most frequently-executed loops form regions
for regional register allocation. The default value of the
parameter is 100.
for regional register allocation.
@item ira-max-conflict-table-size
Although IRA uses a sophisticated algorithm to compress the conflict
@ -11136,37 +11106,33 @@ huge functions. If the conflict table for a function could be more
than the size in MB given by this parameter, the register allocator
instead uses a faster, simpler, and lower-quality
algorithm that does not require building a pseudo-register conflict table.
The default value of the parameter is 2000.
@item ira-loop-reserved-regs
IRA can be used to evaluate more accurate register pressure in loops
for decisions to move loop invariants (see @option{-O3}). The number
of available registers reserved for some other purposes is given
by this parameter. The default value of the parameter is 2, which is
the minimal number of registers needed by typical instructions.
This value is the best found from numerous experiments.
by this parameter. Default of the parameter
is the best found from numerous experiments.
@item lra-inheritance-ebb-probability-cutoff
LRA tries to reuse values reloaded in registers in subsequent insns.
This optimization is called inheritance. EBB is used as a region to
do this optimization. The parameter defines a minimal fall-through
edge probability in percentage used to add BB to inheritance EBB in
LRA. The default value of the parameter is 40. The value was chosen
LRA. The default value was chosen
from numerous runs of SPEC2000 on x86-64.
@item loop-invariant-max-bbs-in-loop
Loop invariant motion can be very expensive, both in compilation time and
in amount of needed compile-time memory, with very large loops. Loops
with more basic blocks than this parameter won't have loop invariant
motion optimization performed on them. The default value of the
parameter is 1000 for @option{-O1} and 10000 for @option{-O2} and above.
motion optimization performed on them.
@item loop-max-datarefs-for-datadeps
Building data dependencies is expensive for very large loops. This
parameter limits the number of data references in loops that are
considered for data dependence analysis. These large loops are no
handled by the optimizations using loop data dependencies.
The default value is 1000.
@item max-vartrack-size
Sets a maximum number of hash table slots to use during variable
@ -11184,14 +11150,14 @@ compilation time for more complete debug information. If this is set too
low, value expressions that are available and could be represented in
debug information may end up not being used; setting this higher may
enable the compiler to find more complex debug expressions, but compile
time and memory use may grow. The default is 12.
time and memory use may grow.
@item max-debug-marker-count
Sets a threshold on the number of debug markers (e.g. begin stmt
markers) to avoid complexity explosion at inlining or expanding to RTL.
If a function has more such gimple stmts than the set limit, such stmts
will be dropped from the inlined copy of a function, and from its RTL
expansion. The default is 100000.
expansion.
@item min-nondebug-insn-uid
Use uids starting at this parameter for nondebug insns. The range below
@ -11224,8 +11190,8 @@ sequence pairs. This option only applies when using
@item graphite-max-nb-scop-params
To avoid exponential effects in the Graphite loop transforms, the
number of parameters in a Static Control Part (SCoP) is bounded. The
default value is 10 parameters, a value of zero can be used to lift
number of parameters in a Static Control Part (SCoP) is bounded.
A value of zero can be used to lift
the bound. A variable whose value is unknown at compilation time and
defined outside a SCoP is a parameter of the SCoP.
@ -11234,15 +11200,7 @@ Loop blocking or strip mining transforms, enabled with
@option{-floop-block} or @option{-floop-strip-mine}, strip mine each
loop in the loop nest by a given number of iterations. The strip
length can be changed using the @option{loop-block-tile-size}
parameter. The default value is 51 iterations.
@item loop-unroll-jam-size
Specify the unroll factor for the @option{-floop-unroll-and-jam} option. The
default value is 4.
@item loop-unroll-jam-depth
Specify the dimension to be unrolled (counting from the most inner loop)
for the @option{-floop-unroll-and-jam}. The default value is 2.
parameter.
@item ipa-cp-value-list-size
IPA-CP attempts to track all possible values and types passed to a function's
@ -11263,7 +11221,6 @@ are evaluated for cloning.
Percentage penalty functions containing a single call to another
function will receive when they are evaluated for cloning.
@item ipa-max-agg-items
IPA-CP is also capable to propagate a number of scalar values passed
in an aggregate. @option{ipa-max-agg-items} controls the maximum
@ -11291,7 +11248,6 @@ consider all memory clobbered after examining
@item lto-partitions
Specify desired number of partitions produced during WHOPR compilation.
The number of partitions should exceed the number of CPUs used for compilation.
The default value is 32.
@item lto-min-partition
Size of minimal partition for WHOPR (in estimated instructions).
@ -11305,29 +11261,28 @@ Meant to be used only with balanced partitioning.
@item cxx-max-namespaces-for-diagnostic-help
The maximum number of namespaces to consult for suggestions when C++
name lookup fails for an identifier. The default is 1000.
name lookup fails for an identifier.
@item sink-frequency-threshold
The maximum relative execution frequency (in percents) of the target block
relative to a statement's original block to allow statement sinking of a
statement. Larger numbers result in more aggressive statement sinking.
The default value is 75. A small positive adjustment is applied for
A small positive adjustment is applied for
statements with memory operands as those are even more profitable so sink.
@item max-stores-to-sink
The maximum number of conditional store pairs that can be sunk. Set to 0
if either vectorization (@option{-ftree-vectorize}) or if-conversion
(@option{-ftree-loop-if-convert}) is disabled. The default is 2.
(@option{-ftree-loop-if-convert}) is disabled.
@item allow-store-data-races
Allow optimizers to introduce new data races on stores.
Set to 1 to allow, otherwise to 0. This option is enabled by default
at optimization level @option{-Ofast}.
Set to 1 to allow, otherwise to 0.
@item case-values-threshold
The smallest number of different values for which it is best to use a
jump-table instead of a tree of conditional branches. If the value is
0, use the default for the machine. The default is 0.
0, use the default for the machine.
@item tree-reassoc-width
Set the maximum number of instructions executed in parallel in
@ -11397,32 +11352,31 @@ E.g. to disable inline code use
@item use-after-scope-direct-emission-threshold
If the size of a local variable in bytes is smaller or equal to this
number, directly poison (or unpoison) shadow memory instead of using
run-time callbacks. The default value is 256.
run-time callbacks.
@item max-fsm-thread-path-insns
Maximum number of instructions to copy when duplicating blocks on a
finite state automaton jump thread path. The default is 100.
finite state automaton jump thread path.
@item max-fsm-thread-length
Maximum number of basic blocks on a finite state automaton jump thread
path. The default is 10.
path.
@item max-fsm-thread-paths
Maximum number of new jump thread paths to create for a finite state
automaton. The default is 50.
automaton.
@item parloops-chunk-size
Chunk size of omp schedule for loops parallelized by parloops. The default
is 0.
Chunk size of omp schedule for loops parallelized by parloops.
@item parloops-schedule
Schedule type of omp schedule for loops parallelized by parloops (static,
dynamic, guided, auto, runtime). The default is static.
dynamic, guided, auto, runtime).
@item parloops-min-per-thread
The minimum number of iterations per thread of an innermost parallelized
loop for which the parallelized variant is prefered over the single threaded
one. The default is 100. Note that for a parallelized loop nest the
loop for which the parallelized variant is preferred over the single threaded
one. Note that for a parallelized loop nest the
minimum number of iterations of the outermost loop per thread is two.
@item max-ssa-name-query-depth
@ -11443,7 +11397,7 @@ we may be able to devirtualize speculatively.
@item max-vrp-switch-assertions
The maximum number of assertions to add along the default edge of a switch
statement during VRP. The default is 10.
statement during VRP.
@item unroll-jam-min-percent
The minimum percentage of memory references that must be optimized
@ -11452,6 +11406,143 @@ away for the unroll-and-jam transformation to be considered profitable.
@item unroll-jam-max-unroll
The maximum number of times the outer loop should be unrolled by
the unroll-and-jam transformation.
@item max-rtl-if-conversion-unpredictable-cost
Maximum permissible cost for the sequence that would be generated
by the RTL if-conversion pass for a branch that is considered unpredictable.
@item max-variable-expansions-in-unroller
If @option{-fvariable-expansion-in-unroller} is used, the maximum number
of times that an individual variable will be expanded during loop unrolling.
@item tracer-min-branch-probability-feedback
Stop forward growth if the probability of best edge is less than
this threshold (in percent). Used when profile feedback is available.
@item partial-inlining-entry-probability
Maximum probability of the entry BB of split region
(in percent relative to entry BB of the function)
to make partial inlining happen.
@item max-tracked-strlens
Maximum number of strings for which strlen optimization pass will
track string lengths.
@item gcse-after-reload-partial-fraction
The threshold ratio for performing partial redundancy
elimination after reload.
@item gcse-after-reload-critical-fraction
The threshold ratio of critical edges execution count that
permit performing redundancy elimination after reload.
@item max-loop-header-insns
The maximum number of insns in loop header duplicated
by the copy loop headers pass.
@item vect-epilogues-nomask
Enable loop epilogue vectorization using smaller vector size.
@item slp-max-insns-in-bb
Maximum number of instructions in basic block to be
considered for SLP vectorization.
@item avoid-fma-max-bits
Maximum number of bits for which we avoid creating FMAs.
@item sms-loop-average-count-threshold
A threshold on the average loop count considered by the swing modulo scheduler.
@item sms-dfa-history
The number of cycles the swing modulo scheduler considers when checking
conflicts using DFA.
@item 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 (used in non-LTO mode)
@item max-inline-insns-recursive-auto
The maximum number of instructions non-inline function
can grow to via recursive inlining.
@item graphite-allow-codegen-errors
Whether codegen errors should be ICEs when @option{-fchecking}.
@item sms-max-ii-factor
A factor for tuning the upper bound that swing modulo scheduler
uses for scheduling a loop.
@item lra-max-considered-reload-pseudos
The max number of reload pseudos which are considered during
spilling a non-reload pseudo.
@item max-pow-sqrt-depth
Maximum depth of sqrt chains to use when synthesizing exponentiation
by a real constant.
@item max-dse-active-local-stores
Maximum number of active local stores in RTL dead store elimination.
@item asan-instrument-allocas
Enable asan allocas/VLAs protection.
@item max-iterations-computation-cost
Bound on the cost of an expression to compute the number of iterations.
@item max-isl-operations
Maximum number of isl operations, 0 means unlimited.
@item graphite-max-arrays-per-scop
Maximum number of arrays per scop.
@item max-vartrack-reverse-op-size
Max. size of loc list for which reverse ops should be added.
@item unlikely-bb-count-fraction
The minimum fraction of profile runs a given basic block execution count
must be not to be considered unlikely.
@item 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.
@item max-inline-recursive-depth-auto
The maximum depth of recursive inlining for non-inline functions.
@item fsm-scale-path-stmts
Scale factor to apply to the number of statements in a threading path
when comparing to the number of (scaled) blocks.
@item fsm-maximum-phi-arguments
Maximum number of arguments a PHI may have before the FSM threader
will not try to thread through its block.
@item uninit-control-dep-attempts
Maximum number of nested calls to search for control dependencies
during uninitialized variable analysis.
@item indir-call-topn-profile
Track top N target addresses in indirect-call profile.
@item max-once-peeled-insns
The maximum number of insns of a peeled loop that rolls only once.
@item sra-max-scalarization-size-Osize
Maximum size, in storage units, of an aggregate
which should be considered for scalarization when compiling for size.
@item fsm-scale-path-blocks
Scale factor to apply to the number of blocks in a threading path
when comparing to the number of (scaled) statements.
@item sched-autopref-queue-depth
Hardware autoprefetcher scheduler model control flag.
Number of lookahead cycles the model looks into; at '
' only enable instruction sorting heuristic.
@end table
@end table