1 /*
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 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 25 
 26 #ifndef CPU_PPC_GLOBALS_PPC_HPP
 27 #define CPU_PPC_GLOBALS_PPC_HPP
 28 
 29 #include "utilities/globalDefinitions.hpp"
 30 #include "utilities/macros.hpp"
 31 
 32 // Sets the default values for platform dependent flags used by the runtime system.
 33 // (see globals.hpp)
 34 
 35 define_pd_global(bool, ImplicitNullChecks,    true);  // Generate code for implicit null checks.
 36 define_pd_global(bool, TrapBasedNullChecks,   true);
 37 define_pd_global(bool, UncommonNullCast,      true);  // Uncommon-trap NULLs passed to check cast.
 38 
 39 #define DEFAULT_STACK_YELLOW_PAGES (2)
 40 #define DEFAULT_STACK_RED_PAGES (1)
 41 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
 42 // stack if compiled for unix and LP64. To pass stack overflow tests we need
 43 // 20 shadow pages.
 44 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2))
 45 #define DEFAULT_STACK_RESERVED_PAGES (1)
 46 
 47 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
 48 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
 49 #define MIN_STACK_SHADOW_PAGES (3 DEBUG_ONLY(+1))
 50 #define MIN_STACK_RESERVED_PAGES (0)
 51 
 52 define_pd_global(intx, StackYellowPages,      DEFAULT_STACK_YELLOW_PAGES);
 53 define_pd_global(intx, StackRedPages,         DEFAULT_STACK_RED_PAGES);
 54 define_pd_global(intx, StackShadowPages,      DEFAULT_STACK_SHADOW_PAGES);
 55 define_pd_global(intx, StackReservedPages,    DEFAULT_STACK_RESERVED_PAGES);
 56 
 57 // Use large code-entry alignment.
 58 define_pd_global(uintx, CodeCacheSegmentSize,  128);
 59 define_pd_global(intx,  CodeEntryAlignment,    128);
 60 define_pd_global(intx,  OptoLoopAlignment,     16);
 61 define_pd_global(intx,  InlineSmallCode,       1500);
 62 
 63 // Flags for template interpreter.
 64 define_pd_global(bool, RewriteBytecodes,      true);
 65 define_pd_global(bool, RewriteFrequentPairs,  true);
 66 
 67 define_pd_global(bool, PreserveFramePointer,  false);
 68 
 69 define_pd_global(bool, InlineTypePassFieldsAsArgs, false);
 70 define_pd_global(bool, InlineTypeReturnedAsFields, false);
 71 
 72 define_pd_global(uintx, TypeProfileLevel, 111);
 73 
 74 define_pd_global(bool, CompactStrings, true);
 75 
 76 // 2x unrolled loop is shorter with more than 9 HeapWords.
 77 define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);
 78 
 79 // Platform dependent flag handling: flags only defined on this platform.
 80 #define ARCH_FLAGS(develop,                                                 \
 81                    product,                                                 \
 82                    notproduct,                                              \
 83                    range,                                                   \
 84                    constraint)                                              \
 85                                                                             \
 86   product(uintx, PowerArchitecturePPC64, 0, DIAGNOSTIC,                     \
 87           "Specify the PowerPC family version in use. If not provided, "    \
 88           "HotSpot will determine it automatically. Host family version "   \
 89           "is the maximum value allowed (instructions are not emulated).")  \
 90                                                                             \
 91   /* Reoptimize code-sequences of calls at runtime, e.g. replace an */      \
 92   /* indirect call by a direct call.                                */      \
 93   product(bool, ReoptimizeCallSequences, true, DIAGNOSTIC,                  \
 94           "Reoptimize code-sequences of calls at runtime.")                 \
 95                                                                             \
 96   /* Power 8: Configure Data Stream Control Register. */                    \
 97   product(uint64_t, DSCR_PPC64, (uint64_t)-1,                               \
 98           "Power8 or later: Specify encoded value for Data Stream Control " \
 99           "Register")                                                       \
100   product(uint64_t, DSCR_DPFD_PPC64, 8,                                     \
101           "Power8 or later: DPFD (default prefetch depth) value of the "    \
102           "Data Stream Control Register."                                   \
103           " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \
104   product(uint64_t, DSCR_URG_PPC64, 8,                                      \
105           "Power8 or later: URG (depth attainment urgency) value of the "   \
106           "Data Stream Control Register."                                   \
107           " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \
108                                                                             \
109   product(bool, UseLoadInstructionsForStackBangingPPC64, false, DIAGNOSTIC, \
110           "Use load instructions for stack banging.")                       \
111                                                                             \
112   product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true, DIAGNOSTIC,\
113           "Use static branch prediction hints in CAS operations.")          \
114   product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false, DIAGNOSTIC,\
115           "Use static branch prediction hints for uncommon paths.")         \
116                                                                             \
117   /* special instructions */                                                \
118   product(bool, SuperwordUseVSX, false,                                     \
119           "Use Power8 VSX instructions for superword optimization.")        \
120                                                                             \
121   product(bool, UseByteReverseInstructions, false, DIAGNOSTIC,              \
122           "Use byte reverse instructions.")                                 \
123                                                                             \
124   product(bool, UseVectorByteReverseInstructionsPPC64, false, DIAGNOSTIC,   \
125           "Use Power9 xxbr* vector byte reverse instructions.")             \
126                                                                             \
127   product(bool, UseCountLeadingZerosInstructionsPPC64, true, DIAGNOSTIC,    \
128           "Use count leading zeros instructions.")                          \
129                                                                             \
130   product(bool, UseCountTrailingZerosInstructionsPPC64, false, DIAGNOSTIC,  \
131           "Use count trailing zeros instructions.")                         \
132                                                                             \
133   product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false, DIAGNOSTIC,\
134           "Use extended versions of load-and-reserve instructions.")        \
135                                                                             \
136   product(bool, UseRotateAndMaskInstructionsPPC64, true, DIAGNOSTIC,        \
137           "Use rotate and mask instructions.")                              \
138                                                                             \
139   /* Trap based checks. */                                                  \
140   /* Trap based checks use the ppc trap instructions to check certain */    \
141   /* conditions. This instruction raises a SIGTRAP caught by the      */    \
142   /* exception handler of the VM.                                     */    \
143   product(bool, UseSIGTRAP, true,                                           \
144           "Allow trap instructions that make use of SIGTRAP. Use this to "  \
145           "switch off all optimizations requiring SIGTRAP.")                \
146   product(bool, TrapBasedICMissChecks, true, DIAGNOSTIC,                    \
147           "Raise and handle SIGTRAP if inline cache miss detected.")        \
148                                                                             \
149   product(bool, TraceTraps, false, DIAGNOSTIC,                              \
150           "Trace all traps the signal handler handles.")                    \
151                                                                             \
152   develop(bool, ZapMemory, false,                                           \
153           "Write 0x0101... to empty memory. Use this to ease debugging.")   \
154                                                                             \
155   /* Use Restricted Transactional Memory for lock elision */                \
156   product(bool, UseRTMLocking, false,                                       \
157           "Enable RTM lock eliding for inflated locks in compiled code")    \
158                                                                             \
159   product(bool, UseRTMForStackLocks, false, EXPERIMENTAL,                   \
160           "Enable RTM lock eliding for stack locks in compiled code")       \
161                                                                             \
162   product(bool, UseRTMDeopt, false,                                         \
163           "Perform deopt and recompilation based on RTM abort ratio")       \
164                                                                             \
165   product(int, RTMRetryCount, 5,                                            \
166           "Number of RTM retries on lock abort or busy")                    \
167           range(0, max_jint)                                                \
168                                                                             \
169   product(int, RTMSpinLoopCount, 100, EXPERIMENTAL,                         \
170           "Spin count for lock to become free before RTM retry")            \
171           range(0, 32767) /* immediate operand limit on ppc */              \
172                                                                             \
173   product(int, RTMAbortThreshold, 1000, EXPERIMENTAL,                       \
174           "Calculate abort ratio after this number of aborts")              \
175           range(0, max_jint)                                                \
176                                                                             \
177   product(int, RTMLockingThreshold, 10000, EXPERIMENTAL,                    \
178           "Lock count at which to do RTM lock eliding without "             \
179           "abort ratio calculation")                                        \
180           range(0, max_jint)                                                \
181                                                                             \
182   product(int, RTMAbortRatio, 50, EXPERIMENTAL,                             \
183           "Lock abort ratio at which to stop use RTM lock eliding")         \
184           range(0, 100) /* natural range */                                 \
185                                                                             \
186   product(int, RTMTotalCountIncrRate, 64, EXPERIMENTAL,                     \
187           "Increment total RTM attempted lock count once every n times")    \
188           range(1, 32767) /* immediate operand limit on ppc */              \
189           constraint(RTMTotalCountIncrRateConstraintFunc,AfterErgo)         \
190                                                                             \
191   product(intx, RTMLockingCalculationDelay, 0, EXPERIMENTAL,                \
192           "Number of milliseconds to wait before start calculating aborts " \
193           "for RTM locking")                                                \
194                                                                             \
195   product(bool, UseRTMXendForLockBusy, true, EXPERIMENTAL,                  \
196           "Use RTM Xend instead of Xabort when lock busy")
197 
198 // end of ARCH_FLAGS
199 
200 #endif // CPU_PPC_GLOBALS_PPC_HPP
--- EOF ---