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  24 
  25 #ifndef CPU_SPARC_VM_GLOBALS_SPARC_HPP
  26 #define CPU_SPARC_VM_GLOBALS_SPARC_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 // For sparc we do not do call backs when a thread is in the interpreter, because the
  35 // interpreter dispatch needs at least two instructions - first to load the dispatch address
  36 // in a register, and second to jmp. The swapping of the dispatch table may occur _after_
  37 // the load of the dispatch address and hence the jmp would still go to the location
  38 // according to the prior table. So, we let the thread continue and let it block by itself.
  39 define_pd_global(bool, DontYieldALot,               true);  // yield no more than 100 times per second
  40 define_pd_global(bool, ConvertSleepToYield,         false); // do not convert sleep(0) to yield. Helps GUI
  41 define_pd_global(bool, ShareVtableStubs,            false); // improves performance markedly for mtrt and compress
  42 define_pd_global(bool, CountInterpCalls,            false); // not implemented in the interpreter
  43 define_pd_global(bool, NeedsDeoptSuspend,           true); // register window machines need this
  44 
  45 define_pd_global(bool, ImplicitNullChecks,          true);  // Generate code for implicit null checks
  46 define_pd_global(bool, UncommonNullCast,            true);  // Uncommon-trap NULLs past to check cast
  47 
  48 define_pd_global(intx, CodeEntryAlignment,    32);
  49 // The default setting 16/16 seems to work best.
  50 // (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.)
  51 define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize
  52 define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
  53 define_pd_global(intx, InlineSmallCode,       1500);
  54 
  55 #ifdef _LP64
  56 // Stack slots are 2X larger in LP64 than in the 32 bit VM.
  57 define_pd_global(intx, ThreadStackSize,       1024);
  58 define_pd_global(intx, VMThreadStackSize,     1024);
  59 define_pd_global(intx, StackShadowPages, 10 DEBUG_ONLY(+1));
  60 #else
  61 define_pd_global(intx, ThreadStackSize,       512);
  62 define_pd_global(intx, VMThreadStackSize,     512);
  63 define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
  64 #endif
  65 
  66 define_pd_global(intx, StackYellowPages, 2);
  67 define_pd_global(intx, StackRedPages, 1);
  68 
  69 define_pd_global(intx, PreInflateSpin,       40);  // Determined by running design center
  70 
  71 define_pd_global(bool, RewriteBytecodes,     true);
  72 define_pd_global(bool, RewriteFrequentPairs, true);
  73 
  74 define_pd_global(bool, UseMembar,            false);
  75 
  76 // GC Ergo Flags
  77 define_pd_global(uintx, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread
  78 
  79 #define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct) \
  80                                                                             \
  81   product(intx, UseVIS, 99,                                                 \
  82           "Highest supported VIS instructions set on Sparc")                \
  83                                                                             \
  84   product(bool, UseCBCond, false,                                           \
  85           "Use compare and branch instruction on SPARC")                    \
  86                                                                             \
  87   product(bool, UseBlockZeroing, false,                                     \
  88           "Use special cpu instructions for block zeroing")                 \
  89                                                                             \
  90   product(intx, BlockZeroingLowLimit, 2048,                                 \
  91           "Minimum size in bytes when block zeroing will be used")          \
  92                                                                             \
  93   product(bool, UseBlockCopy, false,                                        \
  94           "Use special cpu instructions for block copy")                    \
  95                                                                             \
  96   product(intx, BlockCopyLowLimit, 2048,                                    \
  97           "Minimum size in bytes when block copy will be used")             \
  98                                                                             \
  99   develop(bool, UseV8InstrsOnly, false,                                     \
 100           "Use SPARC-V8 Compliant instruction subset")                      \
 101                                                                             \
 102   product(bool, UseNiagaraInstrs, false,                                    \
 103           "Use Niagara-efficient instruction subset")                       \
 104                                                                             \
 105   develop(bool, UseCASForSwap, false,                                       \
 106           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
 107                                                                             \
 108   product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \
 109           "Distance to prefetch source array in arracopy")                  \
 110                                                                             \
 111   product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \
 112           "Distance to prefetch destination array in arracopy")             \
 113                                                                             \
 114   develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
 115           "Number of times to spin wait on a v8 atomic operation lock")     \
 116 
 117 #endif // CPU_SPARC_VM_GLOBALS_SPARC_HPP