1 /*
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  13  * accompanied this code).
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  24 
  25 #ifndef CPU_SPARC_GLOBALS_SPARC_HPP
  26 #define CPU_SPARC_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, ShareVtableStubs,            false); // improves performance markedly for mtrt and compress
  41 
  42 define_pd_global(bool, ImplicitNullChecks,          true);  // Generate code for implicit null checks
  43 define_pd_global(bool, TrapBasedNullChecks,         false); // Not needed on sparc.
  44 define_pd_global(bool, UncommonNullCast,            true);  // Uncommon-trap NULLs passed to check cast
  45 
  46 define_pd_global(bool, UseFastClassInitChecks,      false); // not implemented
  47 
  48 define_pd_global(uintx, CodeCacheSegmentSize, 64 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
  49 define_pd_global(intx, CodeEntryAlignment,    32);
  50 // The default setting 16/16 seems to work best.
  51 // (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.)
  52 define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize
  53 define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
  54 define_pd_global(intx, InlineSmallCode,       1500);
  55 
  56 #define DEFAULT_STACK_YELLOW_PAGES (2)
  57 #define DEFAULT_STACK_RED_PAGES (1)
  58 #define DEFAULT_STACK_RESERVED_PAGES (SOLARIS_ONLY(1) NOT_SOLARIS(0))
  59 
  60 define_pd_global(intx, CompilerThreadStackSize, 1024);
  61 define_pd_global(intx, ThreadStackSize,       1024);
  62 define_pd_global(intx, VMThreadStackSize,     1024);
  63 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2))
  64 
  65 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
  66 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
  67 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
  68 #define MIN_STACK_RESERVED_PAGES (0)
  69 
  70 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
  71 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  72 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  73 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  74 
  75 define_pd_global(bool, RewriteBytecodes,     true);
  76 define_pd_global(bool, RewriteFrequentPairs, true);
  77 
  78 define_pd_global(bool, PreserveFramePointer, false);
  79 
  80 // GC Ergo Flags
  81 define_pd_global(size_t, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread
  82 
  83 define_pd_global(uintx, TypeProfileLevel, 111);
  84 
  85 define_pd_global(bool, CompactStrings, true);
  86 
  87 define_pd_global(intx, InitArrayShortSize, 8*BytesPerLong);
  88 
  89 define_pd_global(bool, ThreadLocalHandshakes, true);
  90 
  91 #define ARCH_FLAGS(develop, \
  92                    product, \
  93                    diagnostic, \
  94                    experimental, \
  95                    notproduct, \
  96                    range, \
  97                    constraint, \
  98                    writeable) \
  99                                                                             \
 100   product(intx, UseVIS, 99,                                                 \
 101           "Highest supported VIS instructions set on SPARC")                \
 102           range(0, 99)                                                      \
 103                                                                             \
 104   product(bool, UseCBCond, false,                                           \
 105           "Use compare and branch instruction on SPARC")                    \
 106                                                                             \
 107   product(bool, UseMPMUL, false,                                            \
 108           "Use multi-precision multiply instruction (mpmul) on SPARC")      \
 109                                                                             \
 110   product(bool, UseBlockZeroing, false,                                     \
 111           "Use special cpu instructions for block zeroing")                 \
 112                                                                             \
 113   product(intx, BlockZeroingLowLimit, 2048,                                 \
 114           "Minimum size in bytes when block zeroing will be used")          \
 115           range(1, max_jint)                                                \
 116                                                                             \
 117   product(bool, UseBlockCopy, false,                                        \
 118           "Use special cpu instructions for block copy")                    \
 119                                                                             \
 120   product(intx, BlockCopyLowLimit, 2048,                                    \
 121           "Minimum size in bytes when block copy will be used")             \
 122           range(1, max_jint)                                                \
 123                                                                             \
 124   product(bool, UseNiagaraInstrs, false,                                    \
 125           "Use Niagara-efficient instruction subset")                       \
 126                                                                             \
 127   develop(bool, UseCASForSwap, false,                                       \
 128           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
 129                                                                             \
 130   product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \
 131           "Distance to prefetch source array in arraycopy")                 \
 132           constraint(ArraycopySrcPrefetchDistanceConstraintFunc, AfterErgo) \
 133                                                                             \
 134   product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \
 135           "Distance to prefetch destination array in arraycopy")            \
 136           constraint(ArraycopyDstPrefetchDistanceConstraintFunc, AfterErgo) \
 137 
 138 #endif // CPU_SPARC_GLOBALS_SPARC_HPP