===================================================================
@@ -11442,14 +11442,39 @@ 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
in cases where a function contains a single loop with known bound and
@@ -12129,11 +12154,6 @@ A threshold on the average loop count considered b
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.
@@ -12171,10 +12191,6 @@ 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.
===================================================================
@@ -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",
===================================================================
@@ -132,8 +132,12 @@ 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);