globals_sparc.hpp revision 1472:c18cbe5936b8 
1/*
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24
25// Sets the default values for platform dependent flags used by the runtime system.
26// (see globals.hpp)
27
28// For sparc we do not do call backs when a thread is in the interpreter, because the
29// interpreter dispatch needs at least two instructions - first to load the dispatch address
30// in a register, and second to jmp. The swapping of the dispatch table may occur _after_
31// the load of the dispatch address and hence the jmp would still go to the location
32// according to the prior table. So, we let the thread continue and let it block by itself.
33define_pd_global(bool, DontYieldALot,               true);  // yield no more than 100 times per second
34define_pd_global(bool, ConvertSleepToYield,         false); // do not convert sleep(0) to yield. Helps GUI
35define_pd_global(bool, ShareVtableStubs,            false); // improves performance markedly for mtrt and compress
36define_pd_global(bool, CountInterpCalls,            false); // not implemented in the interpreter
37define_pd_global(bool, NeedsDeoptSuspend,           true); // register window machines need this
38
39define_pd_global(bool, ImplicitNullChecks,          true);  // Generate code for implicit null checks
40define_pd_global(bool, UncommonNullCast,            true);  // Uncommon-trap NULLs past to check cast
41
42define_pd_global(intx, CodeEntryAlignment,    32);
43// The default setting 16/16 seems to work best.
44// (For _228_jack 16/16 is 2% better than 4/4, 16/4, 32/32, 32/16, or 16/32.)
45define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize
46define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
47define_pd_global(intx, InlineSmallCode,       1500);
48#ifdef _LP64
49// Stack slots are 2X larger in LP64 than in the 32 bit VM.
50define_pd_global(intx, ThreadStackSize,       1024);
51define_pd_global(intx, VMThreadStackSize,     1024);
52#else
53define_pd_global(intx, ThreadStackSize,       512);
54define_pd_global(intx, VMThreadStackSize,     512);
55#endif
56
57define_pd_global(intx, StackYellowPages, 2);
58define_pd_global(intx, StackRedPages, 1);
59define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
60
61define_pd_global(intx, PreInflateSpin,       40);  // Determined by running design center
62
63define_pd_global(bool, RewriteBytecodes,     true);
64define_pd_global(bool, RewriteFrequentPairs, true);
65