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annotate src/cpu/ppc/vm/globals_ppc.hpp @ 14436:b0133e4187d3

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8028471: PPC64 (part 215): opto: Extend ImplicitNullCheck optimization. Summary: Fixed Implicit NULL check optimization for AIX, where the page at address '0' is only write-protected. Reviewed-by: kvn
author goetz
date Thu, 21 Nov 2013 18:29:34 -0800
parents 2e3c546f46d9
children 41b780b43b74
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1 /*
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2 * Copyright (c) 2002, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2012, 2013 SAP AG. All rights reserved.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 #ifndef CPU_PPC_VM_GLOBALS_PPC_HPP
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27 #define CPU_PPC_VM_GLOBALS_PPC_HPP
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28
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29 #include "utilities/globalDefinitions.hpp"
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30 #include "utilities/macros.hpp"
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31
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32 // Sets the default values for platform dependent flags used by the runtime system.
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33 // (see globals.hpp)
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34
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35 define_pd_global(bool, ConvertSleepToYield, true);
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36 define_pd_global(bool, ShareVtableStubs, false); // Improves performance markedly for mtrt and compress.
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37 define_pd_global(bool, NeedsDeoptSuspend, false); // Only register window machines need this.
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38
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39
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40 define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks.
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41 define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs passed to check cast.
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42
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43 // Use large code-entry alignment.
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44 define_pd_global(intx, CodeEntryAlignment, 128);
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45 define_pd_global(intx, OptoLoopAlignment, 16);
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46 define_pd_global(intx, InlineFrequencyCount, 100);
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47 define_pd_global(intx, InlineSmallCode, 1500);
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48
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49 define_pd_global(intx, PreInflateSpin, 10);
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50
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51 // Flags for template interpreter.
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52 define_pd_global(bool, RewriteBytecodes, true);
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53 define_pd_global(bool, RewriteFrequentPairs, true);
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54
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55 define_pd_global(bool, UseMembar, false);
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56
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57 // GC Ergo Flags
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58 define_pd_global(uintx, CMSYoungGenPerWorker, 16*M); // Default max size of CMS young gen, per GC worker thread.
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59
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60 define_pd_global(uintx, TypeProfileLevel, 0);
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61
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62 // Platform dependent flag handling: flags only defined on this platform.
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63 #define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct) \
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64 product(uintx, PowerArchitecturePPC64, 0, \
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65 "CPU Version: x for PowerX. Currently recognizes Power5 to " \
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66 "Power7. Default is 0. CPUs newer than Power7 will be " \
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67 "recognized as Power7.") \
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68 \
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69 /* Reoptimize code-sequences of calls at runtime, e.g. replace an */ \
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70 /* indirect call by a direct call. */ \
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71 product(bool, ReoptimizeCallSequences, true, \
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72 "Reoptimize code-sequences of calls at runtime.") \
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73 \
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74 product(bool, UseLoadInstructionsForStackBangingPPC64, false, \
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75 "Use load instructions for stack banging.") \
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76 \
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77 /* special instructions */ \
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78 \
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79 product(bool, UseCountLeadingZerosInstructionsPPC64, true, \
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80 "Use count leading zeros instructions.") \
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81 \
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82 product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false, \
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83 "Use extended versions of load-and-reserve instructions.") \
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84 \
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85 product(bool, UseRotateAndMaskInstructionsPPC64, true, \
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86 "Use rotate and mask instructions.") \
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87 \
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88 product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true, \
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89 "Use static branch prediction hints in CAS operations.") \
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90 \
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91 /* Trap based checks. */ \
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92 /* Trap based checks use the ppc trap instructions to check certain */ \
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93 /* conditions. This instruction raises a SIGTRAP caught by the */ \
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94 /* exception handler of the VM. */ \
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95 product(bool, UseSIGTRAP, true, \
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96 "Allow trap instructions that make use of SIGTRAP. Use this to " \
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97 "switch off all optimizations requiring SIGTRAP.") \
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98 product(bool, TrapBasedICMissChecks, true, \
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99 "Raise and handle SIGTRAP if inline cache miss detected.") \
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100 product(bool, TrapBasedNotEntrantChecks, true, \
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101 "Raise and handle SIGTRAP if calling not entrant or zombie" \
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102 " method.") \
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103 product(bool, TrapBasedNullChecks, true, \
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104 "Generate code for null checks that uses a cmp and trap " \
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105 "instruction raising SIGTRAP. This is only used if an access to" \
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106 "null (+offset) will not raise a SIGSEGV.") \
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107 product(bool, TrapBasedRangeChecks, true, \
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108 "Raise and handle SIGTRAP if array out of bounds check fails.") \
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109 product(bool, TraceTraps, false, "Trace all traps the signal handler" \
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110 "handles.") \
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111 \
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112 product(bool, ZapMemory, false, "Write 0x0101... to empty memory." \
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113 " Use this to ease debugging.") \
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114
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115
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116
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117 #endif // CPU_PPC_VM_GLOBALS_PPC_HPP