1 /*
   2  * Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
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  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  *
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  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
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  24 
  25 #ifndef CPU_X86_VM_GLOBALS_X86_HPP
  26 #define CPU_X86_VM_GLOBALS_X86_HPP
  27 
  28 #include "utilities/globalDefinitions.hpp"
  29 #include "utilities/macros.hpp"
  30 
  31 // Sets the default values for platform dependent flags used by the runtime system.
  32 // (see globals.hpp)
  33 
  34 define_pd_global(bool, ConvertSleepToYield,      true);
  35 define_pd_global(bool, ShareVtableStubs,         true);
  36 define_pd_global(bool, NeedsDeoptSuspend,        false); // only register window machines need this
  37 
  38 define_pd_global(bool, ImplicitNullChecks,       true);  // Generate code for implicit null checks
  39 define_pd_global(bool, TrapBasedNullChecks,      false); // Not needed on x86.
  40 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs passed to check cast
  41 
  42 // See 4827828 for this change. There is no globals_core_i486.hpp. I can't
  43 // assign a different value for C2 without touching a number of files. Use
  44 // #ifdef to minimize the change as it's late in Mantis. -- FIXME.
  45 // c1 doesn't have this problem because the fix to 4858033 assures us
  46 // the the vep is aligned at CodeEntryAlignment whereas c2 only aligns
  47 // the uep and the vep doesn't get real alignment but just slops on by
  48 // only assured that the entry instruction meets the 5 byte size requirement.
  49 #if defined(COMPILER2) || INCLUDE_JVMCI
  50 define_pd_global(intx, CodeEntryAlignment,       32);
  51 #else
  52 define_pd_global(intx, CodeEntryAlignment,       16);
  53 #endif // COMPILER2
  54 define_pd_global(intx, OptoLoopAlignment,        16);
  55 define_pd_global(intx, InlineFrequencyCount,     100);
  56 define_pd_global(intx, InlineSmallCode,          1000);
  57 
  58 #define DEFAULT_STACK_YELLOW_PAGES (NOT_WINDOWS(2) WINDOWS_ONLY(3))
  59 #define DEFAULT_STACK_RED_PAGES (1)
  60 #define DEFAULT_STACK_RESERVED_PAGES (NOT_WINDOWS(1) WINDOWS_ONLY(0))
  61 
  62 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
  63 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
  64 #define MIN_STACK_RESERVED_PAGES (0)
  65 
  66 #ifdef AMD64
  67 // Very large C++ stack frames using solaris-amd64 optimized builds
  68 // due to lack of optimization caused by C++ compiler bugs
  69 #define DEFAULT_STACK_SHADOW_PAGES (NOT_WIN64(20) WIN64_ONLY(6) DEBUG_ONLY(+2))
  70 // For those clients that do not use write socket, we allow
  71 // the min range value to be below that of the default
  72 #define MIN_STACK_SHADOW_PAGES (NOT_WIN64(10) WIN64_ONLY(6) DEBUG_ONLY(+2))
  73 #else
  74 #define DEFAULT_STACK_SHADOW_PAGES (4 DEBUG_ONLY(+5))
  75 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
  76 #endif // AMD64
  77 
  78 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
  79 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  80 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  81 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  82 
  83 define_pd_global(bool, RewriteBytecodes,     true);
  84 define_pd_global(bool, RewriteFrequentPairs, true);
  85 
  86 #ifdef _ALLBSD_SOURCE
  87 define_pd_global(bool, UseMembar,            true);
  88 #else
  89 define_pd_global(bool, UseMembar,            false);
  90 #endif
  91 
  92 // GC Ergo Flags
  93 define_pd_global(size_t, CMSYoungGenPerWorker, 64*M);  // default max size of CMS young gen, per GC worker thread
  94 
  95 define_pd_global(uintx, TypeProfileLevel, 111);
  96 
  97 define_pd_global(bool, CompactStrings, true);
  98 
  99 define_pd_global(bool, PreserveFramePointer, false);
 100 
 101 #define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct, range, constraint) \
 102                                                                             \
 103   develop(bool, IEEEPrecision, true,                                        \
 104           "Enables IEEE precision (for INTEL only)")                        \
 105                                                                             \
 106   product(bool, UseStoreImmI16, true,                                       \
 107           "Use store immediate 16-bits value instruction on x86")           \
 108                                                                             \
 109   product(intx, UseAVX, 99,                                                 \
 110           "Highest supported AVX instructions set on x86/x64")              \
 111           range(0, 99)                                                      \
 112                                                                             \
 113   product(bool, UseCLMUL, false,                                            \
 114           "Control whether CLMUL instructions can be used on x86/x64")      \
 115                                                                             \
 116   diagnostic(bool, UseIncDec, true,                                         \
 117           "Use INC, DEC instructions on x86")                               \
 118                                                                             \
 119   product(bool, UseNewLongLShift, false,                                    \
 120           "Use optimized bitwise shift left")                               \
 121                                                                             \
 122   product(bool, UseAddressNop, false,                                       \
 123           "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
 124                                                                             \
 125   product(bool, UseXmmLoadAndClearUpper, true,                              \
 126           "Load low part of XMM register and clear upper part")             \
 127                                                                             \
 128   product(bool, UseXmmRegToRegMoveAll, false,                               \
 129           "Copy all XMM register bits when moving value between registers") \
 130                                                                             \
 131   product(bool, UseXmmI2D, false,                                           \
 132           "Use SSE2 CVTDQ2PD instruction to convert Integer to Double")     \
 133                                                                             \
 134   product(bool, UseXmmI2F, false,                                           \
 135           "Use SSE2 CVTDQ2PS instruction to convert Integer to Float")      \
 136                                                                             \
 137   product(bool, UseUnalignedLoadStores, false,                              \
 138           "Use SSE2 MOVDQU instruction for Arraycopy")                      \
 139                                                                             \
 140   product(bool, UseFastStosb, false,                                        \
 141           "Use fast-string operation for zeroing: rep stosb")               \
 142                                                                             \
 143   /* Use Restricted Transactional Memory for lock eliding */                \
 144   product(bool, UseRTMLocking, false,                                       \
 145           "Enable RTM lock eliding for inflated locks in compiled code")    \
 146                                                                             \
 147   experimental(bool, UseRTMForStackLocks, false,                            \
 148           "Enable RTM lock eliding for stack locks in compiled code")       \
 149                                                                             \
 150   product(bool, UseRTMDeopt, false,                                         \
 151           "Perform deopt and recompilation based on RTM abort ratio")       \
 152                                                                             \
 153   product(uintx, RTMRetryCount, 5,                                          \
 154           "Number of RTM retries on lock abort or busy")                    \
 155           range(0, max_uintx)                                               \
 156                                                                             \
 157   experimental(intx, RTMSpinLoopCount, 100,                                 \
 158           "Spin count for lock to become free before RTM retry")            \
 159                                                                             \
 160   experimental(intx, RTMAbortThreshold, 1000,                               \
 161           "Calculate abort ratio after this number of aborts")              \
 162                                                                             \
 163   experimental(intx, RTMLockingThreshold, 10000,                            \
 164           "Lock count at which to do RTM lock eliding without "             \
 165           "abort ratio calculation")                                        \
 166                                                                             \
 167   experimental(intx, RTMAbortRatio, 50,                                     \
 168           "Lock abort ratio at which to stop use RTM lock eliding")         \
 169                                                                             \
 170   experimental(intx, RTMTotalCountIncrRate, 64,                             \
 171           "Increment total RTM attempted lock count once every n times")    \
 172                                                                             \
 173   experimental(intx, RTMLockingCalculationDelay, 0,                         \
 174           "Number of milliseconds to wait before start calculating aborts " \
 175           "for RTM locking")                                                \
 176                                                                             \
 177   experimental(bool, UseRTMXendForLockBusy, true,                           \
 178           "Use RTM Xend instead of Xabort when lock busy")                  \
 179                                                                             \
 180   /* assembler */                                                           \
 181   product(bool, UseCountLeadingZerosInstruction, false,                     \
 182           "Use count leading zeros instruction")                            \
 183                                                                             \
 184   product(bool, UseCountTrailingZerosInstruction, false,                    \
 185           "Use count trailing zeros instruction")                           \
 186                                                                             \
 187   product(bool, UseSSE42Intrinsics, false,                                  \
 188           "SSE4.2 versions of intrinsics")                                  \
 189                                                                             \
 190   product(bool, UseBMI1Instructions, false,                                 \
 191           "Use BMI1 instructions")                                          \
 192                                                                             \
 193   product(bool, UseBMI2Instructions, false,                                 \
 194           "Use BMI2 instructions")                                          \
 195                                                                             \
 196   diagnostic(bool, UseLibmSinIntrinsic, true,                               \
 197           "Use Libm Sin Intrinsic")                                         \
 198                                                                             \
 199   diagnostic(bool, UseLibmCosIntrinsic, true,                               \
 200           "Use Libm Cos Intrinsic")
 201 #endif // CPU_X86_VM_GLOBALS_X86_HPP