Merge pull request #22834 from ymanton/high-opt-fan-in

Enable fan-in heuristics at high opt, reduce method size threshold from 50 to 30 for all opt levels

Author: vijaysun-omr

runtime/compiler/control/J9Options.cpp

@@ -196,7 +196,7 @@ int32_t J9::Options::_maxIprofilingCount = TR_DEFAULT_INITIAL_COUNT; // 3000
 int32_t J9::Options::_maxIprofilingCountInStartupMode = TR_QUICKSTART_INITIAL_COUNT; // 1000
 int32_t J9::Options::_iprofilerFailRateThreshold = 70; // percent 1-100
 int32_t J9::Options::_iprofilerFailHistorySize = 10; // percent 1-100
-int32_t J9::Options::_iprofilerFaninMethodMinSize = 50; // bytecodes
+int32_t J9::Options::_iprofilerFaninMethodMinSize = 30; // bytecodes
 
 int32_t J9::Options::_compYieldStatsThreshold = 1000; // usec
 int32_t J9::Options::_compYieldStatsHeartbeatPeriod = 0; // ms

runtime/compiler/optimizer/InlinerTempForJ9.cpp

@@ -2972,7 +2972,8 @@ TR_J9InlinerPolicy::adjustFanInSizeInWeighCallSite(int32_t& weight,
 
       INLINE_fanInCallGraphFactor is an integer number divided by 100. This allows us to avoid using float numbers for specifying the factor.
       */
-      if (comp()->getMethodHotness() > warm)
+      static bool disableFanInAtHighOpt = feGetEnv("TR_disableFanInAtHighOpt") != NULL;
+      if (disableFanInAtHighOpt && comp()->getMethodHotness() > warm)
          return;
 
       uint32_t thresholdSize = (!comp()->getOption(TR_InlinerFanInUseCalculatedSize)) ? getJ9InitialBytecodeSize(callee, 0, comp()) : size;