globals_sparc.hpp revision 5776:de6a9e811145 
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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, UncommonNullCast,            true);  // Uncommon-trap NULLs past to check cast
47
48define_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.)
51define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize
52define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
53define_pd_global(intx, InlineSmallCode,       1500);
54
55#ifdef _LP64
56// Stack slots are 2X larger in LP64 than in the 32 bit VM.
57define_pd_global(intx, ThreadStackSize,       1024);
58define_pd_global(intx, VMThreadStackSize,     1024);
59define_pd_global(intx, StackShadowPages, 10 DEBUG_ONLY(+1));
60#else
61define_pd_global(intx, ThreadStackSize,       512);
62define_pd_global(intx, VMThreadStackSize,     512);
63define_pd_global(intx, StackShadowPages, 3 DEBUG_ONLY(+1));
64#endif
65
66define_pd_global(intx, StackYellowPages, 2);
67define_pd_global(intx, StackRedPages, 1);
68
69define_pd_global(intx, PreInflateSpin,       40);  // Determined by running design center
70
71define_pd_global(bool, RewriteBytecodes,     true);
72define_pd_global(bool, RewriteFrequentPairs, true);
73
74define_pd_global(bool, UseMembar,            false);
75
76// GC Ergo Flags
77define_pd_global(uintx, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread
78
79define_pd_global(uintx, TypeProfileLevel, 0);
80
81#define ARCH_FLAGS(develop, product, diagnostic, experimental, notproduct) \
82                                                                            \
83  product(intx, UseVIS, 99,                                                 \
84          "Highest supported VIS instructions set on Sparc")                \
85                                                                            \
86  product(bool, UseCBCond, false,                                           \
87          "Use compare and branch instruction on SPARC")                    \
88                                                                            \
89  product(bool, UseBlockZeroing, false,                                     \
90          "Use special cpu instructions for block zeroing")                 \
91                                                                            \
92  product(intx, BlockZeroingLowLimit, 2048,                                 \
93          "Minimum size in bytes when block zeroing will be used")          \
94                                                                            \
95  product(bool, UseBlockCopy, false,                                        \
96          "Use special cpu instructions for block copy")                    \
97                                                                            \
98  product(intx, BlockCopyLowLimit, 2048,                                    \
99          "Minimum size in bytes when block copy will be used")             \
100                                                                            \
101  develop(bool, UseV8InstrsOnly, false,                                     \
102          "Use SPARC-V8 Compliant instruction subset")                      \
103                                                                            \
104  product(bool, UseNiagaraInstrs, false,                                    \
105          "Use Niagara-efficient instruction subset")                       \
106                                                                            \
107  develop(bool, UseCASForSwap, false,                                       \
108          "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
109                                                                            \
110  product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \
111          "Distance to prefetch source array in arracopy")                  \
112                                                                            \
113  product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \
114          "Distance to prefetch destination array in arracopy")             \
115
116#endif // CPU_SPARC_VM_GLOBALS_SPARC_HPP
117