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 #ifdef TIERED
  31 
  32 template<CompLevel level>
  33 bool SimpleThresholdPolicy::call_predicate_helper(int i, int b, double scale, Method* method) {
  34   double threshold_scaling;
  35   if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {
  36     scale *= threshold_scaling;
  37   }
  38   switch(level) {
  39   case CompLevel_aot:
  40     return (i >= Tier3AOTInvocationThreshold * scale) ||
  41            (i >= Tier3AOTMinInvocationThreshold * scale && i + b >= Tier3AOTCompileThreshold * scale);
  42   case CompLevel_none:
  43   case CompLevel_limited_profile:
  44     return (i >= Tier3InvocationThreshold * scale) ||
  45            (i >= Tier3MinInvocationThreshold * scale && i + b >= Tier3CompileThreshold * scale);
  46   case CompLevel_full_profile:
  47    return (i >= Tier4InvocationThreshold * scale) ||
  48           (i >= Tier4MinInvocationThreshold * scale && i + b >= Tier4CompileThreshold * scale);
  49   }
  50   return true;
  51 }
  52 
  53 template<CompLevel level>
  54 bool SimpleThresholdPolicy::loop_predicate_helper(int i, int b, double scale, Method* method) {
  55   double threshold_scaling;
  56   if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {
  57     scale *= threshold_scaling;
  58   }
  59   switch(level) {
  60   case CompLevel_aot:
  61     return b >= Tier3AOTBackEdgeThreshold * scale;
  62   case CompLevel_none:
  63   case CompLevel_limited_profile:
  64     return b >= Tier3BackEdgeThreshold * scale;
  65   case CompLevel_full_profile:
  66     return b >= Tier4BackEdgeThreshold * scale;
  67   }
  68   return true;
  69 }
  70 
  71 // Simple methods are as good being compiled with C1 as C2.
  72 // Determine if a given method is such a case.
  73 bool SimpleThresholdPolicy::is_trivial(Method* method) {
  74   if (method->is_accessor() ||
  75       method->is_constant_getter()) {
  76     return true;
  77   }
  78 #if INCLUDE_JVMCI
  79   if (UseJVMCICompiler) {
  80     if (TieredCompilation && CompileBroker::compiler(CompLevel_full_optimization) != NULL &&
  81         CompileBroker::compiler(CompLevel_full_optimization)->is_trivial(method)) {
  82       return true;
  83     }
  84   }
  85 #endif
  86   if (method->has_loops() || method->code_size() >= 15) {
  87     return false;
  88   }
  89   MethodData* mdo = method->method_data();
  90   if (mdo != NULL && !mdo->would_profile() &&
  91       (method->code_size() < 5  || (mdo->num_blocks() < 4))) {
  92     return true;
  93   }
  94   return false;
  95 }
  96 
  97 #endif // TIERED
  98 
  99 #endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP