1 /*
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  3  * Copyright (c) 2012, 2023 SAP SE. All rights reserved.
  4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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  7  * under the terms of the GNU General Public License version 2 only, as
  8  * published by the Free Software Foundation.
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 10  * This code is distributed in the hope that it will be useful, but WITHOUT
 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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 18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 19  *
 20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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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_pd_global(bool, DelayCompilerStubsGeneration, COMPILER2_OR_JVMCI);
 40 
 41 #define DEFAULT_STACK_YELLOW_PAGES (2)
 42 #define DEFAULT_STACK_RED_PAGES (1)
 43 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
 44 // stack if compiled for unix and LP64. To pass stack overflow tests we need
 45 // 20 shadow pages.
 46 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+2))
 47 #define DEFAULT_STACK_RESERVED_PAGES (1)
 48 
 49 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
 50 #define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
 51 #define MIN_STACK_SHADOW_PAGES (3 DEBUG_ONLY(+1))
 52 #define MIN_STACK_RESERVED_PAGES (0)
 53 
 54 define_pd_global(intx, StackYellowPages,      DEFAULT_STACK_YELLOW_PAGES);
 55 define_pd_global(intx, StackRedPages,         DEFAULT_STACK_RED_PAGES);
 56 define_pd_global(intx, StackShadowPages,      DEFAULT_STACK_SHADOW_PAGES);
 57 define_pd_global(intx, StackReservedPages,    DEFAULT_STACK_RESERVED_PAGES);
 58 
 59 define_pd_global(bool,  VMContinuations, true);
 60 
 61 // Use large code-entry alignment.
 62 define_pd_global(uintx, CodeCacheSegmentSize,  128);
 63 define_pd_global(intx,  CodeEntryAlignment,    128);
 64 define_pd_global(intx,  OptoLoopAlignment,     16);
 65 define_pd_global(intx,  InlineSmallCode,       1500);
 66 
 67 // Flags for template interpreter.
 68 define_pd_global(bool, RewriteBytecodes,      true);
 69 define_pd_global(bool, RewriteFrequentPairs,  true);
 70 
 71 define_pd_global(bool, PreserveFramePointer,  false);
 72 
 73 define_pd_global(uintx, TypeProfileLevel, 111);
 74 
 75 define_pd_global(bool, CompactStrings, true);
 76 
 77 // 2x unrolled loop is shorter with more than 9 HeapWords.
 78 define_pd_global(intx, InitArrayShortSize, 9*BytesPerLong);
 79 
 80 // Platform dependent flag handling: flags only defined on this platform.
 81 #define ARCH_FLAGS(develop,                                                 \
 82                    product,                                                 \
 83                    notproduct,                                              \
 84                    range,                                                   \
 85                    constraint)                                              \
 86                                                                             \
 87   product(uintx, PowerArchitecturePPC64, 0, DIAGNOSTIC,                     \
 88           "Specify the PowerPC family version in use. If not provided, "    \
 89           "HotSpot will determine it automatically. Host family version "   \
 90           "is the maximum value allowed (instructions are not emulated).")  \
 91                                                                             \
 92   /* Reoptimize code-sequences of calls at runtime, e.g. replace an */      \
 93   /* indirect call by a direct call.                                */      \
 94   product(bool, ReoptimizeCallSequences, true, DIAGNOSTIC,                  \
 95           "Reoptimize code-sequences of calls at runtime.")                 \
 96                                                                             \
 97   /* Power 8: Configure Data Stream Control Register. */                    \
 98   product(uint64_t, DSCR_PPC64, (uint64_t)-1,                               \
 99           "Power8 or later: Specify encoded value for Data Stream Control " \
100           "Register")                                                       \
101   product(uint64_t, DSCR_DPFD_PPC64, 8,                                     \
102           "Power8 or later: DPFD (default prefetch depth) value of the "    \
103           "Data Stream Control Register."                                   \
104           " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \
105   product(uint64_t, DSCR_URG_PPC64, 8,                                      \
106           "Power8 or later: URG (depth attainment urgency) value of the "   \
107           "Data Stream Control Register."                                   \
108           " 0: hardware default, 1: none, 2-7: min-max, 8: don't touch")    \
109                                                                             \
110   product(bool, UseLoadInstructionsForStackBangingPPC64, false, DIAGNOSTIC, \
111           "Use load instructions for stack banging.")                       \
112                                                                             \
113   product(bool, UseStaticBranchPredictionInCompareAndSwapPPC64, true, DIAGNOSTIC,\
114           "Use static branch prediction hints in CAS operations.")          \
115   product(bool, UseStaticBranchPredictionForUncommonPathsPPC64, false, DIAGNOSTIC,\
116           "Use static branch prediction hints for uncommon paths.")         \
117                                                                             \
118   /* special instructions */                                                \
119   product(bool, SuperwordUseVSX, false,                                     \
120           "Use Power8 VSX instructions for superword optimization.")        \
121                                                                             \
122   product(bool, UseByteReverseInstructions, false, DIAGNOSTIC,              \
123           "Use byte reverse instructions.")                                 \
124                                                                             \
125   product(bool, UseVectorByteReverseInstructionsPPC64, false, DIAGNOSTIC,   \
126           "Use Power9 xxbr* vector byte reverse instructions.")             \
127                                                                             \
128   product(bool, UseCountLeadingZerosInstructionsPPC64, true, DIAGNOSTIC,    \
129           "Use count leading zeros instructions.")                          \
130                                                                             \
131   product(bool, UseCountTrailingZerosInstructionsPPC64, false, DIAGNOSTIC,  \
132           "Use count trailing zeros instructions.")                         \
133                                                                             \
134   product(bool, UseExtendedLoadAndReserveInstructionsPPC64, false, DIAGNOSTIC,\
135           "Use extended versions of load-and-reserve instructions.")        \
136                                                                             \
137   product(bool, UseRotateAndMaskInstructionsPPC64, true, DIAGNOSTIC,        \
138           "Use rotate and mask instructions.")                              \
139                                                                             \
140   /* Trap based checks. */                                                  \
141   /* Trap based checks use the ppc trap instructions to check certain */    \
142   /* conditions. This instruction raises a SIGTRAP caught by the      */    \
143   /* exception handler of the VM.                                     */    \
144   product(bool, UseSIGTRAP, true,                                           \
145           "Allow trap instructions that make use of SIGTRAP. Use this to "  \
146           "switch off all optimizations requiring SIGTRAP.")                \
147   product(bool, TrapBasedICMissChecks, true, DIAGNOSTIC,                    \
148           "Raise and handle SIGTRAP if inline cache miss detected.")        \
149                                                                             \
150   product(bool, TraceTraps, false, DIAGNOSTIC,                              \
151           "Trace all traps the signal handler handles.")                    \
152                                                                             \
153   develop(bool, ZapMemory, false,                                           \
154           "Write 0x0101... to empty memory. Use this to ease debugging.")
155 
156 // end of ARCH_FLAGS
157 
158 #endif // CPU_PPC_GLOBALS_PPC_HPP