1 /*
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   3  * Copyright (c) 2015, 2019, Red Hat Inc. 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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  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.
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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 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
  40 define_pd_global(intx, CodeEntryAlignment,       64);
  41 define_pd_global(intx, OptoLoopAlignment,        16);
  42 define_pd_global(intx, InlineFrequencyCount,     100);
  43 
  44 #define DEFAULT_STACK_YELLOW_PAGES (2)
  45 #define DEFAULT_STACK_RED_PAGES (1)
  46 // Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
  47 // stack if compiled for unix and LP64. To pass stack overflow tests we need
  48 // 20 shadow pages.
  49 #define DEFAULT_STACK_SHADOW_PAGES (20 DEBUG_ONLY(+5))
  50 #define DEFAULT_STACK_RESERVED_PAGES (1)
  51 
  52 #define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
  53 #define MIN_STACK_RED_PAGES    DEFAULT_STACK_RED_PAGES
  54 #define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
  55 #define MIN_STACK_RESERVED_PAGES (0)
  56 
  57 define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
  58 define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
  59 define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
  60 define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
  61 
  62 define_pd_global(bool, RewriteBytecodes,     true);
  63 define_pd_global(bool, RewriteFrequentPairs, true);
  64 
  65 define_pd_global(bool, PreserveFramePointer, false);
  66 
  67 define_pd_global(uintx, TypeProfileLevel, 111);
  68 
  69 define_pd_global(bool, CompactStrings, true);
  70 
  71 // Clear short arrays bigger than one word in an arch-specific way
  72 define_pd_global(intx, InitArrayShortSize, BytesPerLong);
  73 
  74 #if defined(COMPILER1) || defined(COMPILER2)
  75 define_pd_global(intx, InlineSmallCode,          1000);
  76 #endif
  77 
  78 #include "runtime/flags/jvmFlag.hpp"
  79 PRODUCT_FLAG(bool,     NearCpool, true, JVMFlag::DEFAULT,
  80                        "constant pool is close to instructions");
  81 
  82 PRODUCT_FLAG(bool,     UseBarriersForVolatile, false, JVMFlag::DEFAULT,
  83                        "Use memory barriers to implement volatile accesses");
  84 
  85 PRODUCT_FLAG(bool,     UseNeon, false, JVMFlag::DEFAULT,
  86                        "Use Neon for CRC32 computation");
  87 
  88 PRODUCT_FLAG(bool,     UseCRC32, false, JVMFlag::DEFAULT,
  89                        "Use CRC32 instructions for CRC32 computation");
  90 
  91 PRODUCT_FLAG(bool,     UseSIMDForMemoryOps, false, JVMFlag::DEFAULT,
  92                        "Use SIMD instructions in generated memory move code");
  93 
  94 PRODUCT_FLAG(bool,     UseSIMDForArrayEquals, true, JVMFlag::DEFAULT,
  95                        "Use SIMD instructions in generated array equals code");
  96 
  97 PRODUCT_FLAG(bool,     UseSimpleArrayEquals, false, JVMFlag::DEFAULT,
  98                        "Use simpliest and shortest implementation for array equals");
  99 
 100 PRODUCT_FLAG(bool,     AvoidUnalignedAccesses, false, JVMFlag::DEFAULT,
 101                        "Avoid generating unaligned memory accesses");
 102 
 103 PRODUCT_FLAG(bool,     UseLSE, false, JVMFlag::DEFAULT,
 104                        "Use LSE instructions");
 105 
 106 PRODUCT_FLAG(bool,     UseBlockZeroing, true, JVMFlag::DEFAULT,
 107                        "Use DC ZVA for block zeroing");
 108 
 109 PRODUCT_FLAG(intx,     BlockZeroingLowLimit, 256, JVMFlag::RANGE,
 110                        "Minimum size in bytes when block zeroing will be used");
 111    FLAG_RANGE(         BlockZeroingLowLimit, 1, max_jint);
 112 
 113 PRODUCT_FLAG(bool,     TraceTraps, false, JVMFlag::DEFAULT,
 114                        "Trace all traps the signal handler");
 115 
 116 PRODUCT_FLAG(int,      SoftwarePrefetchHintDistance, -1, JVMFlag::RANGE,
 117                        "Use prfm hint with specified distance in compiled code."
 118                        "Value -1 means off.");
 119    FLAG_RANGE(         SoftwarePrefetchHintDistance, -1, 4096);
 120 
 121 #endif // CPU_AARCH64_GLOBALS_AARCH64_HPP