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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

#ifndef CPU_PPC_VM_GLOBALS_PPC_HPP

#define CPU_PPC_VM_GLOBALS_PPC_HPP

#include "utilities/globalDefinitions.hpp"

#include "utilities/macros.hpp"

// Sets the default values for platform dependent flags used by the runtime system.

// (see globals.hpp)

define_pd_global(bool, ShareVtableStubs,      false); // Improves performance markedly for mtrt and compress.

define_pd_global(bool, NeedsDeoptSuspend,     false); // Only register window machines need this.

define_pd_global(bool, ImplicitNullChecks,    true);  // Generate code for implicit null checks.

define_pd_global(bool, TrapBasedNullChecks,   true);

define_pd_global(bool, UncommonNullCast,      true);  // Uncommon-trap NULLs passed to check cast.

#define DEFAULT_STACK_YELLOW_PAGES (2)

#define DEFAULT_STACK_RED_PAGES (1)

// Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the

// stack if compiled for unix and LP64. To pass stack overflow tests we need

// 20 shadow pages.

#define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2))

#define DEFAULT_STACK_RESERVED_PAGES (1)

#define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES

#define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES

#define MIN_STACK_SHADOW_PAGES (3 DEBUG_ONLY(+1))

#define MIN_STACK_RESERVED_PAGES (0)

define_pd_global(intx, StackYellowPages,      DEFAULT_STACK_YELLOW_PAGES);

define_pd_global(intx, StackRedPages,         DEFAULT_STACK_RED_PAGES);

define_pd_global(intx, StackShadowPages,      DEFAULT_STACK_SHADOW_PAGES);

define_pd_global(intx, StackReservedPages,    DEFAULT_STACK_RESERVED_PAGES);

// Use large code-entry alignment.

define_pd_global(uintx, CodeCacheSegmentSize,  128);

define_pd_global(intx,  CodeEntryAlignment,    128);

define_pd_global(intx,  OptoLoopAlignment,     16);

define_pd_global(intx,  InlineFrequencyCount,  100);

define_pd_global(intx,  InlineSmallCode,       1500);

// Flags for template interpreter.

define_pd_global(bool, RewriteBytecodes,      true);

define_pd_global(bool, RewriteFrequentPairs,  true);

define_pd_global(bool, UseMembar,             false);

define_pd_global(bool, PreserveFramePointer,  false);

// GC Ergo Flags

define_pd_global(size_t, CMSYoungGenPerWorker, 16*M);  // Default max size of CMS young gen, per GC worker thread.

define_pd_global(uintx, TypeProfileLevel, 111);

define_pd_global(bool, CompactStrings, true);

// 2x unrolled loop is shorter with more than 9 HeapWords.

define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);

// Platform dependent flag handling: flags only defined on this platform.

#define ARCH_FLAGS(develop, \

                   product, \

                   diagnostic, \

                   experimental, \

                   notproduct, \

                   range, \

                   constraint, \

                   writeable)  \

                                                                            \

  /* Load poll address from thread. This is used to implement per-thread */ \

  /* safepoints on platforms != IA64. */                                    \

  product(bool, LoadPollAddressFromThread, false,                           \

          "Load polling page address from thread object (required for "     \

          "per-thread safepoints on platforms != IA64)")                    \

                                                                            \

  product(uintx, PowerArchitecturePPC64, 0,                                 \

          "CPU Version: x for PowerX. Currently recognizes Power5 to "      \

          "Power8. Default is 0. Newer CPUs will be recognized as Power8.") \

                                                                            \

  /* Reoptimize code-sequences of calls at runtime, e.g. replace an */      \

  /* indirect call by a direct call.                                */      \

  product(bool, ReoptimizeCallSequences, true,                              \

          "Reoptimize code-sequences of calls at runtime.")                 \

                                                                            \

  /* Power 8: Configure Data Stream Control Register. */                    \

  product(uint64_t,DSCR_PPC64, (uintx)-1,                                   \

          "Power8 or later: Specify encoded value for Data Stream Control " \

          "Register")                                                       \

  product(uint64_t,DSCR_DPFD_PPC64, 8,                                      \

          "Power8 or later: DPFD (default prefetch depth) value of the "    \

          "Data Stream Control Register."                                   \

          " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \

  product(uint64_t,DSCR_URG_PPC64, 8,                                       \

          "Power8 or later: URG (depth attainment urgency) value of the "   \

          "Data Stream Control Register."                                   \

          " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \

                                                                            \

  product(bool, UseLoadInstructionsForStackBangingPPC64, false,             \

          "Use load instructions for stack banging.")                       \

                                                                            \

  /* special instructions */                                                \

                                                                            \

  product(bool, UseCountLeadingZerosInstructionsPPC64, true,                \

          "Use count leading zeros instructions.")                          \

                                                                            \

  product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false,          \

          "Use extended versions of load-and-reserve instructions.")        \

                                                                            \

  product(bool, UseRotateAndMaskInstructionsPPC64, true,                    \

          "Use rotate and mask instructions.")                              \

                                                                            \

  product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true,       \

          "Use static branch prediction hints in CAS operations.")          \

  product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false,      \

          "Use static branch prediction hints for uncommon paths.")         \

                                                                            \

  product(bool, UsePower6SchedulerPPC64, false,                             \

          "Use Power6 Scheduler.")                                          \

                                                                            \

  product(bool, InsertEndGroupPPC64, false,                                 \

          "Insert EndGroup instructions to optimize for Power6.")           \

                                                                            \

  /* Trap based checks. */                                                  \

  /* Trap based checks use the ppc trap instructions to check certain */    \

  /* conditions. This instruction raises a SIGTRAP caught by the      */    \

  /* exception handler of the VM.                                     */    \

  product(bool, UseSIGTRAP, true,                                           \

          "Allow trap instructions that make use of SIGTRAP. Use this to "  \

          "switch off all optimizations requiring SIGTRAP.")                \

  product(bool, TrapBasedICMissChecks, true,                                \

          "Raise and handle SIGTRAP if inline cache miss detected.")        \

  product(bool, TrapBasedNotEntrantChecks, true,                            \

          "Raise and handle SIGTRAP if calling not entrant or zombie"       \

          " method.")                                                       \

  product(bool, TraceTraps, false, "Trace all traps the signal handler"     \

          "handles.")                                                       \

                                                                            \

  product(bool, ZapMemory, false, "Write 0x0101... to empty memory."        \

          " Use this to ease debugging.")                                   \

                                                                            \

  /* Use Restricted Transactional Memory for lock elision */                \

  product(bool, UseRTMLocking, false,                                       \

          "Enable RTM lock eliding for inflated locks in compiled code")    \

                                                                            \

  experimental(bool, UseRTMForStackLocks, false,                            \

          "Enable RTM lock eliding for stack locks in compiled code")       \

                                                                            \

  product(bool, UseRTMDeopt, false,                                         \

          "Perform deopt and recompilation based on RTM abort ratio")       \

                                                                            \

  product(int, RTMRetryCount, 5,                                            \

          "Number of RTM retries on lock abort or busy")                    \

          range(0, max_jint)                                                \

                                                                            \

  experimental(int, RTMSpinLoopCount, 100,                                  \

          "Spin count for lock to become free before RTM retry")            \

          range(0, 32767) /* immediate operand limit on ppc */              \

                                                                            \

  experimental(int, RTMAbortThreshold, 1000,                                \

          "Calculate abort ratio after this number of aborts")              \

          range(0, max_jint)                                                \

                                                                            \

  experimental(int, RTMLockingThreshold, 10000,                             \

          "Lock count at which to do RTM lock eliding without "             \

          "abort ratio calculation")                                        \

          range(0, max_jint)                                                \

                                                                            \

  experimental(int, RTMAbortRatio, 50,                                      \

          "Lock abort ratio at which to stop use RTM lock eliding")         \

                                                                            \

  experimental(int, RTMTotalCountIncrRate, 64,                              \

          "Increment total RTM attempted lock count once every n times")    \

          range(1, 32767) /* immediate operand limit on ppc */              \

                                                                            \

  experimental(intx, RTMLockingCalculationDelay, 0,                         \

          "Number of milliseconds to wait before start calculating aborts " \

          "for RTM locking")                                                \

                                                                            \

  experimental(bool, UseRTMXendForLockBusy, true,                           \

          "Use RTM Xend instead of Xabort when lock busy")                  \

#endif // CPU_PPC_VM_GLOBALS_PPC_HPP