globals_ppc.hpp

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.
 *
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 * 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.
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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, ConvertSleepToYield,   true);
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, UncommonNullCast,      true);  // Uncommon-trap NULLs passed to check cast.

// Use large code-entry alignment.
define_pd_global(intx, CodeEntryAlignment,    128);
define_pd_global(intx, OptoLoopAlignment,     16);
define_pd_global(intx, InlineFrequencyCount,  100);
define_pd_global(intx, InlineSmallCode,       1500);

define_pd_global(intx, PreInflateSpin,        10);

// Flags for template interpreter.
define_pd_global(bool, RewriteBytecodes,      true);
define_pd_global(bool, RewriteFrequentPairs,  true);

define_pd_global(bool, UseMembar,             false);

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


// Platform dependent flag handling: flags only defined on this platform.
#define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct)  \
  product(uintx, PowerArchitecturePPC64, 0,                                 \
          "CPU Version: x for PowerX. Currently recognizes Power5 to "      \
          "Power7. Default is 0. CPUs newer than Power7 will be "           \
          "recognized as Power7.")                                          \
                                                                            \
  /* 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.")                 \
                                                                            \
  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.")          \
                                                                            \
  /* 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, false,                                          \
          "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, TrapBasedNullChecks, true,                                  \
          "Generate code for null checks that uses a cmp and trap "         \
          "instruction raising SIGTRAP.  This is only used if an access to" \
          "null (+offset) will not raise a SIGSEGV.")                       \
  product(bool, TrapBasedRangeChecks, true,                                 \
          "Raise and handle SIGTRAP if array out of bounds check fails.")   \
  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.")                                   \



#endif // CPU_PPC_VM_GLOBALS_PPC_HPP