1 /*
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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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 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(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
 57 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
 58 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
 59 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
 60 
 61 define_pd_global(bool, RewriteBytecodes,     true);
 62 define_pd_global(bool, RewriteFrequentPairs, true);
 63 
 64 define_pd_global(bool, PreserveFramePointer, false);
 65 
 66 define_pd_global(uintx, TypeProfileLevel, 111);
 67 
 68 define_pd_global(bool, CompactStrings, true);
 69 
 70 // Clear short arrays bigger than one word in an arch-specific way
 71 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
 72 
 73 #if defined(COMPILER1) || defined(COMPILER2)
 74 define_pd_global(intx, InlineSmallCode,          1000);
 75 #endif
 76 
 77 #define ARCH_FLAGS(develop,                                             \
 78                    product,                                             \
 79                    notproduct,                                          \
 80                    range,                                               \
 81                    constraint)                                          \
 82                                                                         \
 83   product(bool, NearCpool, true,                                        \
 84          "constant pool is close to instructions")                      \
 85   product(bool, UseNeon, false,                                         \
 86           "Use Neon for CRC32 computation")                             \
 87   product(bool, UseCRC32, false,                                        \
 88           "Use CRC32 instructions for CRC32 computation")               \
 89   product(bool, UseSIMDForMemoryOps, false,                             \
 90           "Use SIMD instructions in generated memory move code")        \
 91   product(bool, UseSIMDForArrayEquals, true,                            \
 92           "Use SIMD instructions in generated array equals code")       \
 93   product(bool, UseSimpleArrayEquals, false,                            \
 94           "Use simpliest and shortest implementation for array equals") \
 95   product(bool, UseSIMDForBigIntegerShiftIntrinsics, true,              \
 96           "Use SIMD instructions for left/right shift of BigInteger")   \
 97   product(bool, AvoidUnalignedAccesses, false,                          \
 98           "Avoid generating unaligned memory accesses")                 \
 99   product(bool, UseLSE, false,                                          \
100           "Use LSE instructions")                                       \
101   product(uint, UseSVE, 0,                                              \
102           "Highest supported SVE instruction set version")              \
103           range(0, 2)                                                   \
104   product(bool, UseBlockZeroing, true,                                  \
105           "Use DC ZVA for block zeroing")                               \
106   product(intx, BlockZeroingLowLimit, 256,                              \
107           "Minimum size in bytes when block zeroing will be used")      \
108           range(1, max_jint)                                            \
109   product(bool, TraceTraps, false, "Trace all traps the signal handler")\
110   product(int, SoftwarePrefetchHintDistance, -1,                        \
111           "Use prfm hint with specified distance in compiled code."     \
112           "Value -1 means off.")                                        \
113           range(-1, 4096)
114 
115 // end of ARCH_FLAGS
116 
117 #endif // CPU_AARCH64_GLOBALS_AARCH64_HPP