jdk-24/hotspot/src/share/vm/runtime/simpleThresholdPolicy.inline.hpp

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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#ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP
#define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP

#include "compiler/compilerOracle.hpp"

template<CompLevel level>
bool SimpleThresholdPolicy::call_predicate_helper(int i, int b, double scale, Method* method) {
  double threshold_scaling;
  if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {
    scale *= threshold_scaling;
  }
  switch(level) {
  case CompLevel_none:
  case CompLevel_limited_profile:
    return (i >= Tier3InvocationThreshold * scale) ||
           (i >= Tier3MinInvocationThreshold * scale && i + b >= Tier3CompileThreshold * scale);
  case CompLevel_full_profile:
   return (i >= Tier4InvocationThreshold * scale) ||
          (i >= Tier4MinInvocationThreshold * scale && i + b >= Tier4CompileThreshold * scale);
  }
  return true;
}

template<CompLevel level>
bool SimpleThresholdPolicy::loop_predicate_helper(int i, int b, double scale, Method* method) {
  double threshold_scaling;
  if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {
    scale *= threshold_scaling;
  }
  switch(level) {
  case CompLevel_none:
  case CompLevel_limited_profile:
    return b >= Tier3BackEdgeThreshold * scale;
  case CompLevel_full_profile:
    return b >= Tier4BackEdgeThreshold * scale;
  }
  return true;
}

// Simple methods are as good being compiled with C1 as C2.
// Determine if a given method is such a case.
bool SimpleThresholdPolicy::is_trivial(Method* method) {
  if (method->is_accessor() ||
      method->is_constant_getter()) {
    return true;
  }
  if (method->has_loops() || method->code_size() >= 15) {
    return false;
  }
  MethodData* mdo = method->method_data();
  if (mdo != NULL && !mdo->would_profile() &&
      (method->code_size() < 5  || (mdo->num_blocks() < 4))) {
    return true;
  }
  return false;
}

#endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP