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