globals_sparc.hpp revision 11979:e7203436d63d 
1/*
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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, ShareVtableStubs,            false); // improves performance markedly for mtrt and compress
41define_pd_global(bool, NeedsDeoptSuspend,           true); // register window machines need this
42
43define_pd_global(bool, ImplicitNullChecks,          true);  // Generate code for implicit null checks
44define_pd_global(bool, TrapBasedNullChecks,         false); // Not needed on sparc.
45define_pd_global(bool, UncommonNullCast,            true);  // Uncommon-trap NULLs passed to check cast
46
47define_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.)
50define_pd_global(intx, OptoLoopAlignment,     16);  // = 4*wordSize
51define_pd_global(intx, InlineFrequencyCount,  50);  // we can use more inlining on the SPARC
52define_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#ifdef _LP64
59// Stack slots are 2X larger in LP64 than in the 32 bit VM.
60define_pd_global(intx, CompilerThreadStackSize, 1024);
61define_pd_global(intx, ThreadStackSize,       1024);
62define_pd_global(intx, VMThreadStackSize,     1024);
63#define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2))
64#else
65define_pd_global(intx, CompilerThreadStackSize, 512);
66define_pd_global(intx, ThreadStackSize,       512);
67define_pd_global(intx, VMThreadStackSize,     512);
68#define DEFAULT_STACK_SHADOW_PAGES (6 DEBUG_ONLY(+2))
69#endif // _LP64
70
71#define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
72#define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
73#define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
74#define MIN_STACK_RESERVED_PAGES (0)
75
76define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
77define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
78define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
79define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
80
81define_pd_global(bool, RewriteBytecodes,     true);
82define_pd_global(bool, RewriteFrequentPairs, true);
83
84define_pd_global(bool, UseMembar,            false);
85
86define_pd_global(bool, PreserveFramePointer, false);
87
88// GC Ergo Flags
89define_pd_global(size_t, CMSYoungGenPerWorker, 16*M);  // default max size of CMS young gen, per GC worker thread
90
91define_pd_global(uintx, TypeProfileLevel, 111);
92
93define_pd_global(bool, CompactStrings, true);
94
95define_pd_global(intx, InitArrayShortSize, 8*BytesPerLong);
96
97#define ARCH_FLAGS(develop, \
98                   product, \
99                   diagnostic, \
100                   experimental, \
101                   notproduct, \
102                   range, \
103                   constraint, \
104                   writeable) \
105                                                                            \
106  product(intx, UseVIS, 99,                                                 \
107          "Highest supported VIS instructions set on Sparc")                \
108          range(0, 99)                                                      \
109                                                                            \
110  product(bool, UseCBCond, false,                                           \
111          "Use compare and branch instruction on SPARC")                    \
112                                                                            \
113  product(bool, UseBlockZeroing, false,                                     \
114          "Use special cpu instructions for block zeroing")                 \
115                                                                            \
116  product(intx, BlockZeroingLowLimit, 2048,                                 \
117          "Minimum size in bytes when block zeroing will be used")          \
118          range(1, max_jint)                                                \
119                                                                            \
120  product(bool, UseBlockCopy, false,                                        \
121          "Use special cpu instructions for block copy")                    \
122                                                                            \
123  product(intx, BlockCopyLowLimit, 2048,                                    \
124          "Minimum size in bytes when block copy will be used")             \
125          range(1, max_jint)                                                \
126                                                                            \
127  develop(bool, UseV8InstrsOnly, false,                                     \
128          "Use SPARC-V8 Compliant instruction subset")                      \
129                                                                            \
130  product(bool, UseNiagaraInstrs, false,                                    \
131          "Use Niagara-efficient instruction subset")                       \
132                                                                            \
133  develop(bool, UseCASForSwap, false,                                       \
134          "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
135                                                                            \
136  product(uintx,  ArraycopySrcPrefetchDistance, 0,                          \
137          "Distance to prefetch source array in arraycopy")                 \
138          constraint(ArraycopySrcPrefetchDistanceConstraintFunc, AfterErgo) \
139                                                                            \
140  product(uintx,  ArraycopyDstPrefetchDistance, 0,                          \
141          "Distance to prefetch destination array in arraycopy")            \
142          constraint(ArraycopyDstPrefetchDistanceConstraintFunc, AfterErgo) \
143
144#endif // CPU_SPARC_VM_GLOBALS_SPARC_HPP
145