hotspot/src/share/vm/runtime/simpleThresholdPolicy.inline.hpp
author thartmann
Tue, 11 Nov 2014 11:05:41 +0100
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8056071: compiler/whitebox/IsMethodCompilableTest.java fails with 'method() is not compilable after 3 iterations' Summary: Always use MDO if valid and always compile trivial methods with C1 if available. Reviewed-by: kvn, iveresov
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/*
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 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP
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#define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP
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template<CompLevel level>
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bool SimpleThresholdPolicy::call_predicate_helper(int i, int b, double scale) {
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  switch(level) {
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  case CompLevel_none:
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  case CompLevel_limited_profile:
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    return (i >= Tier3InvocationThreshold * scale) ||
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           (i >= Tier3MinInvocationThreshold * scale && i + b >= Tier3CompileThreshold * scale);
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  case CompLevel_full_profile:
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   return (i >= Tier4InvocationThreshold * scale) ||
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          (i >= Tier4MinInvocationThreshold * scale && i + b >= Tier4CompileThreshold * scale);
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  }
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  return true;
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}
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template<CompLevel level>
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bool SimpleThresholdPolicy::loop_predicate_helper(int i, int b, double scale) {
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  switch(level) {
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  case CompLevel_none:
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  case CompLevel_limited_profile:
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    return b >= Tier3BackEdgeThreshold * scale;
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  case CompLevel_full_profile:
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    return b >= Tier4BackEdgeThreshold * scale;
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  }
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  return true;
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}
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// Simple methods are as good being compiled with C1 as C2.
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// Determine if a given method is such a case.
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bool SimpleThresholdPolicy::is_trivial(Method* method) {
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  if (method->is_accessor() ||
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      method->is_constant_getter()) {
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    return true;
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  }
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  if (method->has_loops() || method->code_size() >= 15) {
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    return false;
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  }
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  MethodData* mdo = method->method_data();
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  if (mdo != NULL && !mdo->would_profile() &&
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      (method->code_size() < 5  || (mdo->num_blocks() < 4))) {
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    return true;
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  }
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  return false;
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}
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#endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP