1 /*
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  8  * published by the Free Software Foundation.
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 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 13  * version 2 for more details (a copy is included in the LICENSE file that
 14  * accompanied this code).
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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(uintx, TypeProfileLevel, 111);
 70 
 71 define_pd_global(bool, CompactStrings, true);
 72 
 73 // 2x unrolled loop is shorter with more than 9 HeapWords.
 74 define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);
 75 
 76 // Platform dependent flag handling: flags only defined on this platform.
 77 #define ARCH_FLAGS(develop,                                                 \
 78                    product,                                                 \
 79                    notproduct,                                              \
 80                    range,                                                   \
 81                    constraint)                                              \
 82                                                                             \
 83   product(uintx, PowerArchitecturePPC64, 0, DIAGNOSTIC,                     \
 84           "Specify the PowerPC family version in use. If not provided, "    \
 85           "HotSpot will determine it automatically. Host family version "   \
 86           "is the maximum value allowed (instructions are not emulated).")  \
 87                                                                             \
 88   /* Reoptimize code-sequences of calls at runtime, e.g. replace an */      \
 89   /* indirect call by a direct call.                                */      \
 90   product(bool, ReoptimizeCallSequences, true, DIAGNOSTIC,                  \
 91           "Reoptimize code-sequences of calls at runtime.")                 \
 92                                                                             \
 93   /* Power 8: Configure Data Stream Control Register. */                    \
 94   product(uint64_t, DSCR_PPC64, (uint64_t)-1,                               \
 95           "Power8 or later: Specify encoded value for Data Stream Control " \
 96           "Register")                                                       \
 97   product(uint64_t, DSCR_DPFD_PPC64, 8,                                     \
 98           "Power8 or later: DPFD (default prefetch depth) value of the "    \
 99           "Data Stream Control Register."                                   \
100           " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \
101   product(uint64_t, DSCR_URG_PPC64, 8,                                      \
102           "Power8 or later: URG (depth attainment urgency) value of the "   \
103           "Data Stream Control Register."                                   \
104           " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \
105                                                                             \
106   product(bool, UseLoadInstructionsForStackBangingPPC64, false, DIAGNOSTIC, \
107           "Use load instructions for stack banging.")                       \
108                                                                             \
109   product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true, DIAGNOSTIC,\
110           "Use static branch prediction hints in CAS operations.")          \
111   product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false, DIAGNOSTIC,\
112           "Use static branch prediction hints for uncommon paths.")         \
113                                                                             \
114   /* special instructions */                                                \
115   product(bool, SuperwordUseVSX, false,                                     \
116           "Use Power8 VSX instructions for superword optimization.")        \
117                                                                             \
118   product(bool, UseByteReverseInstructions, false, DIAGNOSTIC,              \
119           "Use byte reverse instructions.")                                 \
120                                                                             \
121   product(bool, UseVectorByteReverseInstructionsPPC64, false, DIAGNOSTIC,   \
122           "Use Power9 xxbr* vector byte reverse instructions.")             \
123                                                                             \
124   product(bool, UseCountLeadingZerosInstructionsPPC64, true, DIAGNOSTIC,    \
125           "Use count leading zeros instructions.")                          \
126                                                                             \
127   product(bool, UseCountTrailingZerosInstructionsPPC64, false, DIAGNOSTIC,  \
128           "Use count trailing zeros instructions.")                         \
129                                                                             \
130   product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false, DIAGNOSTIC,\
131           "Use extended versions of load-and-reserve instructions.")        \
132                                                                             \
133   product(bool, UseRotateAndMaskInstructionsPPC64, true, DIAGNOSTIC,        \
134           "Use rotate and mask instructions.")                              \
135                                                                             \
136   /* Trap based checks. */                                                  \
137   /* Trap based checks use the ppc trap instructions to check certain */    \
138   /* conditions. This instruction raises a SIGTRAP caught by the      */    \
139   /* exception handler of the VM.                                     */    \
140   product(bool, UseSIGTRAP, true,                                           \
141           "Allow trap instructions that make use of SIGTRAP. Use this to "  \
142           "switch off all optimizations requiring SIGTRAP.")                \
143   product(bool, TrapBasedICMissChecks, true, DIAGNOSTIC,                    \
144           "Raise and handle SIGTRAP if inline cache miss detected.")        \
145                                                                             \
146   product(bool, TraceTraps, false, DIAGNOSTIC,                              \
147           "Trace all traps the signal handler handles.")                    \
148                                                                             \
149   develop(bool, ZapMemory, false,                                           \
150           "Write 0x0101... to empty memory. Use this to ease debugging.")   \
151                                                                             \
152   /* Use Restricted Transactional Memory for lock elision */                \
153   product(bool, UseRTMLocking, false,                                       \
154           "Enable RTM lock eliding for inflated locks in compiled code")    \
155                                                                             \
156   product(bool, UseRTMForStackLocks, false, EXPERIMENTAL,                   \
157           "Enable RTM lock eliding for stack locks in compiled code")       \
158                                                                             \
159   product(bool, UseRTMDeopt, false,                                         \
160           "Perform deopt and recompilation based on RTM abort ratio")       \
161                                                                             \
162   product(int, RTMRetryCount, 5,                                            \
163           "Number of RTM retries on lock abort or busy")                    \
164           range(0, max_jint)                                                \
165                                                                             \
166   product(int, RTMSpinLoopCount, 100, EXPERIMENTAL,                         \
167           "Spin count for lock to become free before RTM retry")            \
168           range(0, 32767) /* immediate operand limit on ppc */              \
169                                                                             \
170   product(int, RTMAbortThreshold, 1000, EXPERIMENTAL,                       \
171           "Calculate abort ratio after this number of aborts")              \
172           range(0, max_jint)                                                \
173                                                                             \
174   product(int, RTMLockingThreshold, 10000, EXPERIMENTAL,                    \
175           "Lock count at which to do RTM lock eliding without "             \
176           "abort ratio calculation")                                        \
177           range(0, max_jint)                                                \
178                                                                             \
179   product(int, RTMAbortRatio, 50, EXPERIMENTAL,                             \
180           "Lock abort ratio at which to stop use RTM lock eliding")         \
181           range(0, 100) /* natural range */                                 \
182                                                                             \
183   product(int, RTMTotalCountIncrRate, 64, EXPERIMENTAL,                     \
184           "Increment total RTM attempted lock count once every n times")    \
185           range(1, 32767) /* immediate operand limit on ppc */              \
186           constraint(RTMTotalCountIncrRateConstraintFunc,AfterErgo)         \
187                                                                             \
188   product(intx, RTMLockingCalculationDelay, 0, EXPERIMENTAL,                \
189           "Number of milliseconds to wait before start calculating aborts " \
190           "for RTM locking")                                                \
191                                                                             \
192   product(bool, UseRTMXendForLockBusy, true, EXPERIMENTAL,                  \
193           "Use RTM Xend instead of Xabort when lock busy")
194 
195 // end of ARCH_FLAGS
196 
197 #endif // CPU_PPC_GLOBALS_PPC_HPP
--- EOF ---