1 /*

     2  * Copyright (c) 2001, 2018, 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 #include "oops/method.inline.hpp"

    30 

    31 #ifdef TIERED

    32 

    33 template<CompLevel level>

    34 bool SimpleThresholdPolicy::call_predicate_helper(int i, int b, double scale, Method* method) {

    35   double threshold_scaling;

    36   if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {

    37     scale *= threshold_scaling;

    38   }

    39   switch(level) {

    40   case CompLevel_aot:

    41     return (i >= Tier3AOTInvocationThreshold * scale) ||

    42            (i >= Tier3AOTMinInvocationThreshold * scale && i + b >= Tier3AOTCompileThreshold * scale);

    43   case CompLevel_none:

    44   case CompLevel_limited_profile:

    45     return (i >= Tier3InvocationThreshold * scale) ||

    46            (i >= Tier3MinInvocationThreshold * scale && i + b >= Tier3CompileThreshold * scale);

    47   case CompLevel_full_profile:

    48    return (i >= Tier4InvocationThreshold * scale) ||

    49           (i >= Tier4MinInvocationThreshold * scale && i + b >= Tier4CompileThreshold * scale);

    50   }

    51   return true;

    52 }

    53 

    54 template<CompLevel level>

    55 bool SimpleThresholdPolicy::loop_predicate_helper(int i, int b, double scale, Method* method) {

    56   double threshold_scaling;

    57   if (CompilerOracle::has_option_value(method, "CompileThresholdScaling", threshold_scaling)) {

    58     scale *= threshold_scaling;

    59   }

    60   switch(level) {

    61   case CompLevel_aot:

    62     return b >= Tier3AOTBackEdgeThreshold * scale;

    63   case CompLevel_none:

    64   case CompLevel_limited_profile:

    65     return b >= Tier3BackEdgeThreshold * scale;

    66   case CompLevel_full_profile:

    67     return b >= Tier4BackEdgeThreshold * scale;

    68   }

    69   return true;

    70 }

    71 

    72 // Simple methods are as good being compiled with C1 as C2.

    73 // Determine if a given method is such a case.

    74 bool SimpleThresholdPolicy::is_trivial(Method* method) {

    75   if (method->is_accessor() ||

    76       method->is_constant_getter()) {

    77     return true;

    78   }

    79 #if INCLUDE_JVMCI

    80   if (UseJVMCICompiler) {

    81     AbstractCompiler* comp = CompileBroker::compiler(CompLevel_full_optimization);

    82     if (TieredCompilation && comp != NULL && comp->is_trivial(method)) {

    83       return true;

    84     }

    85   }

    86 #endif

    87   if (method->has_loops() || method->code_size() >= 15) {

    88     return false;

    89   }

    90   MethodData* mdo = method->method_data();

    91   if (mdo != NULL && !mdo->would_profile() &&

    92       (method->code_size() < 5  || (mdo->num_blocks() < 4))) {

    93     return true;

    94   }

    95   return false;

    96 }

    97 

    98 inline CompLevel SimpleThresholdPolicy::comp_level(Method* method) {

    99   CompiledMethod *nm = method->code();

   100   if (nm != NULL && nm->is_in_use()) {

   101     return (CompLevel)nm->comp_level();

   102   }

   103   return CompLevel_none;

   104 }

   105 

   106 #endif // TIERED

   107 

   108 #endif // SHARE_VM_RUNTIME_SIMPLETHRESHOLDPOLICY_INLINE_HPP