1 /*
   2  * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP
  26 #define SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP
  27 
  28 #include "compiler/compilerOracle.hpp"
  29 
  30 template<CompLevel level>
  31 bool SimpleThresholdPolicy::call_predicate_helper(int i, int b, double scale, Method* method) {
  32   double threshold_scaling;
  33   if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {
  34     scale *= threshold_scaling;
  35   }
  36   switch(level) {
  37   case CompLevel_none:
  38   case CompLevel_limited_profile:
  39     return (i >= Tier3InvocationThreshold * scale) ||
  40            (i >= Tier3MinInvocationThreshold * scale && i + b >= Tier3CompileThreshold * scale);
  41   case CompLevel_full_profile:
  42    return (i >= Tier4InvocationThreshold * scale) ||
  43           (i >= Tier4MinInvocationThreshold * scale && i + b >= Tier4CompileThreshold * scale);
  44   }
  45   return true;
  46 }
  47 
  48 template<CompLevel level>
  49 bool SimpleThresholdPolicy::loop_predicate_helper(int i, int b, double scale, Method* method) {
  50   double threshold_scaling;
  51   if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {
  52     scale *= threshold_scaling;
  53   }
  54   switch(level) {
  55   case CompLevel_none:
  56   case CompLevel_limited_profile:
  57     return b >= Tier3BackEdgeThreshold * scale;
  58   case CompLevel_full_profile:
  59     return b >= Tier4BackEdgeThreshold * scale;
  60   }
  61   return true;
  62 }
  63 
  64 // Simple methods are as good being compiled with C1 as C2.
  65 // Determine if a given method is such a case.
  66 bool SimpleThresholdPolicy::is_trivial(Method* method) {
  67   if (method->is_accessor() ||
  68       method->is_constant_getter()) {
  69     return true;
  70   }
  71 #if INCLUDE_JVMCI
  72   if (UseJVMCICompiler) {
  73     if (TieredCompilation && CompileBroker::compiler(CompLevel_full_optimization) != NULL &&
  74         CompileBroker::compiler(CompLevel_full_optimization)->is_trivial(method)) {
  75       return true;
  76     }
  77   }
  78 #endif
  79   if (method->has_loops() || method->code_size() >= 15) {
  80     return false;
  81   }
  82   MethodData* mdo = method->method_data();
  83   if (mdo != NULL && !mdo->would_profile() &&
  84       (method->code_size() < 5  || (mdo->num_blocks() < 4))) {
  85     return true;
  86   }
  87   return false;
  88 }
  89 
  90 #endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP