globals_sparc.hpp revision 6010:abec000618bf 
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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.
39define_pd_global(bool, DontYieldALot,               true);  // yield no more than 100 times per second
40define_pd_global(bool, ConvertSleepToYield,         false); // do not convert sleep(0) to yield. Helps GUI
41define_pd_global(bool, ShareVtableStubs,            false); // improves performance markedly for mtrt and compress
42define_pd_global(bool, CountInterpCalls,            false); // not implemented in the interpreter
43define_pd_global(bool, NeedsDeoptSuspend,           true); // register window machines need this
44
45define_pd_global(bool, ImplicitNullChecks,          true);  // Generate code for implicit null checks
46define_pd_global(bool, TrapBasedNullChecks,         false); // Not needed on sparc.
47define_pd_global(bool, UncommonNullCast,            true);  // Uncommon-trap NULLs passed to check cast
48
49define_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.)
52define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize
53define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
54define_pd_global(intx, InlineSmallCode,       1500);
55
56#ifdef _LP64
57// Stack slots are 2X larger in LP64 than in the 32 bit VM.
58define_pd_global(intx, ThreadStackSize,       1024);
59define_pd_global(intx, VMThreadStackSize,     1024);
60define_pd_global(intx, StackShadowPages, 10 DEBUG_ONLY(+1));
61#else
62define_pd_global(intx, ThreadStackSize,       512);
63define_pd_global(intx, VMThreadStackSize,     512);
64define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
65#endif
66
67define_pd_global(intx, StackYellowPages, 2);
68define_pd_global(intx, StackRedPages, 1);
69
70define_pd_global(intx, PreInflateSpin,       40);  // Determined by running design center
71
72define_pd_global(bool, RewriteBytecodes,     true);
73define_pd_global(bool, RewriteFrequentPairs, true);
74
75define_pd_global(bool, UseMembar,            false);
76
77// GC Ergo Flags
78define_pd_global(uintx, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread
79
80define_pd_global(uintx, TypeProfileLevel, 0);
81
82#define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct) \
83                                                                            \
84  product(intx, UseVIS, 99,                                                 \
85          "Highest supported VIS instructions set on Sparc")                \
86                                                                            \
87  product(bool, UseCBCond, false,                                           \
88          "Use compare and branch instruction on SPARC")                    \
89                                                                            \
90  product(bool, UseBlockZeroing, false,                                     \
91          "Use special cpu instructions for block zeroing")                 \
92                                                                            \
93  product(intx, BlockZeroingLowLimit, 2048,                                 \
94          "Minimum size in bytes when block zeroing will be used")          \
95                                                                            \
96  product(bool, UseBlockCopy, false,                                        \
97          "Use special cpu instructions for block copy")                    \
98                                                                            \
99  product(intx, BlockCopyLowLimit, 2048,                                    \
100          "Minimum size in bytes when block copy will be used")             \
101                                                                            \
102  develop(bool, UseV8InstrsOnly, false,                                     \
103          "Use SPARC-V8 Compliant instruction subset")                      \
104                                                                            \
105  product(bool, UseNiagaraInstrs, false,                                    \
106          "Use Niagara-efficient instruction subset")                       \
107                                                                            \
108  develop(bool, UseCASForSwap, false,                                       \
109          "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
110                                                                            \
111  product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \
112          "Distance to prefetch source array in arracopy")                  \
113                                                                            \
114  product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \
115          "Distance to prefetch destination array in arracopy")             \
116
117#endif // CPU_SPARC_VM_GLOBALS_SPARC_HPP
118