This patch bumps up the parameter 'hot-bb-count-fraction' from 10000
to 40000. This results in about a 0.5% geomean performance
improvement across internal benchmarks for x86-64 LIPO. The parameter
change effectively increases the number of functions/callsites which
are considered hot. The performance improvement is likely due to
increased inlining (more callsites are considered hot and available
for inlining).
Bootstrapped and reg-tested on x86-64. OK for google/gcc-4_6?
Mark
2011-08-24 Mark Heffernan <meh...@google.com>
* params.def (hot-bb-count-fraction): Change default value.
Index: params.def
===================================================================
--- params.def (revision 177964)
+++ params.def (working copy)
@@ -382,7 +382,7 @@ DEFPARAM(PARAM_SMS_LOOP_AVERAGE_COUNT_TH
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, 0, 0)
+ 40000, 0, 0)
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",
