procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

invoke.texi (hot-bb-count-fraction): Rework description.

Browse source 
* doc/invoke.texi (hot-bb-count-fraction): Rework description.
	(hot-bb-count-ws-permille): Likewise.
	(hot-bb-frequency-fraction): Likewise.
	(unlikely-bb-count-fraction): Likewise.
	* params.def (hot-bb-count-fraction): Rework description.
	(hot-bb-count-ws-permille): Likewise.
	(hot-bb-frequency-fraction): Likewise.
	(unlikely-bb-count-fraction): Likewise.  Remove min and max values.
	* predict.c (get_hot_bb_threshold): Deal with 0 HOT_BB_COUNT_FRACTION.

From-SVN: r274006
This commit is contained in:
Eric Botcazou 2019-08-02 10:09:04 +00:00 • committed by Eric Botcazou
parent d603877768
commit cc692b4c40
4 changed files with 63 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
gcc/ChangeLog
View file

@ -1,3 +1,15 @@
2019-08-02 Eric Botcazou <ebotcazou@adacore.com>
* doc/invoke.texi (hot-bb-count-fraction): Rework description.
(hot-bb-count-ws-permille): Likewise.
(hot-bb-frequency-fraction): Likewise.
(unlikely-bb-count-fraction): Likewise.
* params.def (hot-bb-count-fraction): Rework description.
(hot-bb-count-ws-permille): Likewise.
(hot-bb-frequency-fraction): Likewise.
(unlikely-bb-count-fraction): Likewise. Remove min and max values.
* predict.c (get_hot_bb_threshold): Deal with 0 HOT_BB_COUNT_FRACTION.
2019-08-02 Uroš Bizjak <ubizjak@gmail.com>
PR target/91323

42
gcc/doc/invoke.texi
View file

@ -11443,13 +11443,38 @@ for vectorizer. Value -1 means no limit.
The maximum number of iterations of a loop the brute-force algorithm
for analysis of the number of iterations of the loop tries to evaluate.
@item hot-bb-count-fraction
The denominator n of fraction 1/n of the maximal execution count of a
basic block in the entire program that a basic block needs to at least
have in order to be considered hot. The default is 10000, which means
that a basic block is considered hot if its execution count is greater
than 1/10000 of the maximal execution count. 0 means that it is never
considered hot. Used in non-LTO mode.
@item hot-bb-count-ws-permille
A basic block profile count is considered hot if it contributes to
the given permillage (i.e.@: 0...1000) of the entire profiled execution.
The number of most executed permilles, ranging from 0 to 1000, of the
profiled execution of the entire program to which the execution count
of a basic block must be part of in order to be considered hot. The
default is 990, which means that a basic block is considered hot if
its execution count contributes to the upper 990 permilles, or 99.0%,
of the profiled execution of the entire program. 0 means that it is
never considered hot. Used in LTO mode.
@item hot-bb-frequency-fraction
Select fraction of the entry block frequency of executions of basic block in
function given basic block needs to have to be considered hot.
The denominator n of fraction 1/n of the execution frequency of the
entry block of a function that a basic block of this function needs
to at least have in order to be considered hot. The default is 1000,
which means that a basic block is considered hot in a function if it
is executed more frequently than 1/1000 of the frequency of the entry
block of the function. 0 means that it is never considered hot.
@item unlikely-bb-count-fraction
The denominator n of fraction 1/n of the number of profiled runs of
the entire program below which the execution count of a basic block
must be in order for the basic block to be considered unlikely executed.
The default is 20, which means that a basic block is considered unlikely
executed if it is executed in fewer than 1/20, or 5%, of the runs of
the program. 0 means that it is always considered unlikely executed.
@item max-predicted-iterations
The maximum number of loop iterations we predict statically. This is useful
@ -12130,11 +12155,6 @@ A threshold on the average loop count considered by the swing modulo scheduler.
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.
@ -12172,10 +12192,6 @@ 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.

22
gcc/params.def
View file

@ -427,23 +427,31 @@ DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_THRESHOLD,
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 (used in non-LTO mode).",
"The denominator n of fraction 1/n of the maximal execution count of "
"a basic block in the entire program that a basic block needs to at "
"least have in order to be considered hot (used in non-LTO mode).",
10000, 0, 0)
DEFPARAM(HOT_BB_COUNT_WS_PERMILLE,
"hot-bb-count-ws-permille",
"A basic block profile count is considered hot if it contributes to "
"the given permillage of the entire profiled execution (used in LTO mode).",
"The number of most executed permilles of the profiled execution of "
"the entire program to which the execution count of a basic block "
"must be part of in order to be considered hot (used in LTO mode).",
990, 0, 1000)
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.",
"The denominator n of fraction 1/n of the execution frequency of the "
"entry block of a function that a basic block of this function needs "
"to at least have in order to be considered hot.",
1000, 0, 0)
DEFPARAM(UNLIKELY_BB_COUNT_FRACTION,
"unlikely-bb-count-fraction",
"The minimum fraction of profile runs a given basic block execution count must be not to be considered unlikely.",
20, 1, 10000)
"The denominator n of fraction 1/n of the number of profiled runs of "
"the entire program below which the execution count of a basic block "
"must be in order for the basic block to be considered unlikely.",
20, 0, 0)
DEFPARAM (PARAM_ALIGN_THRESHOLD,
"align-threshold",

10
gcc/predict.c
View file

@ -132,11 +132,15 @@ get_hot_bb_threshold ()
{
if (min_count == -1)
{
gcov_type t = profile_info->sum_max / PARAM_VALUE (HOT_BB_COUNT_FRACTION);
set_hot_bb_threshold (t);
const int hot_frac = PARAM_VALUE (HOT_BB_COUNT_FRACTION);
const gcov_type min_hot_count
= hot_frac
? profile_info->sum_max / hot_frac
: (gcov_type)profile_count::max_count;
set_hot_bb_threshold (min_hot_count);
if (dump_file)
fprintf (dump_file, "Setting hotness threshold to %" PRId64 ".\n",
min_count);
min_hot_count);
}
return min_count;
}