1 /*
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 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 13  * version 2 for more details (a copy is included in the LICENSE file that
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 25 
 26 #ifndef CPU_AARCH64_GLOBALS_AARCH64_HPP
 27 #define CPU_AARCH64_GLOBALS_AARCH64_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,  false);
 37 define_pd_global(bool, UncommonNullCast,         true);  // Uncommon-trap NULLs past to check cast
 38 
 39 define_pd_global(uintx, CodeCacheSegmentSize,    64 COMPILER1_AND_COMPILER2_PRESENT(+64)); // Tiered compilation has large code-entry alignment.
 40 define_pd_global(intx, CodeEntryAlignment,       64);
 41 define_pd_global(intx, OptoLoopAlignment,        16);
 42 
 43 #define DEFAULT_STACK_YELLOW_PAGES (2)
 44 #define DEFAULT_STACK_RED_PAGES (1)
 45 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
 46 // stack if compiled for unix and LP64. To pass stack overflow tests we need
 47 // 20 shadow pages.
 48 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+5))
 49 #define DEFAULT_STACK_RESERVED_PAGES (1)
 50 
 51 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
 52 #define MIN_STACK_RED_PAGES    DEFAULT_STACK_RED_PAGES
 53 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
 54 #define MIN_STACK_RESERVED_PAGES (0)
 55 
 56 define_pd_global(bool, VMContinuations, true);
 57 
 58 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
 59 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
 60 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
 61 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
 62 
 63 define_pd_global(bool, RewriteBytecodes,     true);
 64 define_pd_global(bool, RewriteFrequentPairs, true);
 65 
 66 define_pd_global(bool, PreserveFramePointer, false);
 67 
 68 define_pd_global(uintx, TypeProfileLevel, 111);
 69 
 70 define_pd_global(bool, CompactStrings, true);
 71 
 72 // Clear short arrays bigger than one word in an arch-specific way
 73 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
 74 
 75 #if defined(COMPILER1) || defined(COMPILER2)
 76 define_pd_global(intx, InlineSmallCode,          1000);
 77 #endif
 78 
 79 #define ARCH_FLAGS(develop,                                             \
 80                    product,                                             \
 81                    notproduct,                                          \
 82                    range,                                               \
 83                    constraint)                                          \
 84                                                                         \
 85   product(bool, NearCpool, true,                                        \
 86          "constant pool is close to instructions")                      \
 87   product(bool, UseNeon, false,                                         \
 88           "Use Neon for CRC32 computation")                             \
 89   product(bool, UseCRC32, false,                                        \
 90           "Use CRC32 instructions for CRC32 computation")               \
 91   product(bool, UseSIMDForMemoryOps, false,                             \
 92           "Use SIMD instructions in generated memory move code")        \
 93   product(bool, UseSIMDForArrayEquals, true,                            \
 94           "Use SIMD instructions in generated array equals code")       \
 95   product(bool, UseSimpleArrayEquals, false,                            \
 96           "Use simplest and shortest implementation for array equals")  \
 97   product(bool, UseSIMDForBigIntegerShiftIntrinsics, true,              \
 98           "Use SIMD instructions for left/right shift of BigInteger")   \
 99   product(bool, AvoidUnalignedAccesses, false,                          \
100           "Avoid generating unaligned memory accesses")                 \
101   product(bool, UseLSE, false,                                          \
102           "Use LSE instructions")                                       \
103   product(uint, UseSVE, 0,                                              \
104           "Highest supported SVE instruction set version")              \
105           range(0, 2)                                                   \
106   product(bool, UseBlockZeroing, true,                                  \
107           "Use DC ZVA for block zeroing")                               \
108   product(intx, BlockZeroingLowLimit, 256,                              \
109           "Minimum size in bytes when block zeroing will be used")      \
110           range(wordSize, max_jint)                                     \
111   product(bool, TraceTraps, false, "Trace all traps the signal handler")\
112   product(int, SoftwarePrefetchHintDistance, -1,                        \
113           "Use prfm hint with specified distance in compiled code."     \
114           "Value -1 means off.")                                        \
115           range(-1, 4096)                                               \
116   product(ccstr, OnSpinWaitInst, "none", DIAGNOSTIC,                    \
117           "The instruction to use to implement "                        \
118           "java.lang.Thread.onSpinWait()."                              \
119           "Options: none, nop, isb, yield.")                            \
120   product(uint, OnSpinWaitInstCount, 1, DIAGNOSTIC,                     \
121           "The number of OnSpinWaitInst instructions to generate."      \
122           "It cannot be used with OnSpinWaitInst=none.")                \
123           range(1, 99)                                                  \
124   product(ccstr, UseBranchProtection, "none",                           \
125           "Branch Protection to use: none, standard, pac-ret")          \
126 
127 // end of ARCH_FLAGS
128 
129 #endif // CPU_AARCH64_GLOBALS_AARCH64_HPP