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

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 * 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.

 *

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 */

#ifndef CPU_SPARC_VM_GLOBALS_SPARC_HPP

#define CPU_SPARC_VM_GLOBALS_SPARC_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)

// For sparc we do not do call backs when a thread is in the interpreter, because the

// interpreter dispatch needs at least two instructions - first to load the dispatch address

// in a register, and second to jmp. The swapping of the dispatch table may occur _after_

// the load of the dispatch address and hence the jmp would still go to the location

// according to the prior table. So, we let the thread continue and let it block by itself.

define_pd_global(bool, DontYieldALot,               true);  // yield no more than 100 times per second

define_pd_global(bool, ConvertSleepToYield,         false); // do not convert sleep(0) to yield. Helps GUI

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

define_pd_global(bool, CountInterpCalls,            false); // not implemented in the interpreter

define_pd_global(bool, NeedsDeoptSuspend,           true); // 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 past to check cast

define_pd_global(intx, CodeEntryAlignment,    32);

// The default setting 16/16 seems to work best.

// (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.)

define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize

define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC

define_pd_global(intx, InlineSmallCode,       1500);

#ifdef _LP64

// Stack slots are 2X larger in LP64 than in the 32 bit VM.

define_pd_global(intx, ThreadStackSize,       1024);

define_pd_global(intx, VMThreadStackSize,     1024);

define_pd_global(intx, StackShadowPages, 10 DEBUG_ONLY(+1));

#else

define_pd_global(intx, ThreadStackSize,       512);

define_pd_global(intx, VMThreadStackSize,     512);

define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));

#endif

define_pd_global(intx, StackYellowPages, 2);

define_pd_global(intx, StackRedPages, 1);

define_pd_global(intx, PreInflateSpin,       40);  // Determined by running design center

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

#define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct) \

                                                                            \

  product(intx, UseVIS, 99,                                                 \

          "Highest supported VIS instructions set on Sparc")                \

                                                                            \

  product(bool, UseCBCond, false,                                           \

          "Use compare and branch instruction on SPARC")                    \

                                                                            \

  product(bool, UseBlockZeroing, false,                                     \

          "Use special cpu instructions for block zeroing")                 \

                                                                            \

  product(intx, BlockZeroingLowLimit, 2048,                                 \

          "Minimum size in bytes when block zeroing will be used")          \

                                                                            \

  product(bool, UseBlockCopy, false,                                        \

          "Use special cpu instructions for block copy")                    \

                                                                            \

  product(intx, BlockCopyLowLimit, 2048,                                    \

          "Minimum size in bytes when block copy will be used")             \

                                                                            \

  develop(bool, UseV8InstrsOnly, false,                                     \

          "Use SPARC-V8 Compliant instruction subset")                      \

                                                                            \

  product(bool, UseNiagaraInstrs, false,                                    \

          "Use Niagara-efficient instruction subset")                       \

                                                                            \

  develop(bool, UseCASForSwap, false,                                       \

          "Do not use swap instructions, but only CAS (in a loop) on SPARC")\

                                                                            \

  product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \

          "Distance to prefetch source array in arracopy")                  \

                                                                            \

  product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \

          "Distance to prefetch destination array in arracopy")             \

#endif // CPU_SPARC_VM_GLOBALS_SPARC_HPP