mozglue/build/arm.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 /* compile-time and runtime tests for whether to use SSE instructions */
   6
   7 #ifndef mozilla_arm_h_
   8 #define mozilla_arm_h_
   9
  10 // for definition of MFBT_DATA
  11 #include "mozilla/Types.h"
  12
  13 /* This is patterned after SSE.h, but provides ARMv5E, ARMv6, and NEON
  14    detection. For reasons similar to the SSE code, code using NEON (even just
  15    in inline asm) needs to be in a separate compilation unit from the regular
  16    code, because it requires an ".fpu neon" directive which can't be undone.
  17    ARMv5E and ARMv6 code may also require an .arch directive, since by default
  18    the assembler refuses to generate code for opcodes outside of its current
  19    .arch setting.
  20
  21    TODO: Add Thumb, Thumb2, VFP, iwMMX, etc. detection, if we need it. */
  22
  23 #if defined(__GNUC__) && defined(__arm__)
  24
  25 #  define MOZILLA_ARM_ARCH 3
  26
  27 #  if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) || \
  28       defined(_ARM_ARCH_4)
  29 #    undef MOZILLA_ARM_ARCH
  30 #    define MOZILLA_ARM_ARCH 4
  31 #  endif
  32
  33 #  if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) ||   \
  34       defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) || \
  35       defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
  36 #    undef MOZILLA_ARM_ARCH
  37 #    define MOZILLA_ARM_ARCH 5
  38 #  endif
  39
  40 #  if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) ||    \
  41       defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) ||   \
  42       defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) || \
  43       defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
  44 #    undef MOZILLA_ARM_ARCH
  45 #    define MOZILLA_ARM_ARCH 6
  46 #  endif
  47
  48 #  if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) ||  \
  49       defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) || \
  50       defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
  51 #    undef MOZILLA_ARM_ARCH
  52 #    define MOZILLA_ARM_ARCH 7
  53 #  endif
  54
  55 #  ifdef __GNUC__
  56 #    define MOZILLA_MAY_SUPPORT_EDSP 1
  57
  58 #    if defined(HAVE_ARM_SIMD)
  59 #      define MOZILLA_MAY_SUPPORT_ARMV6 1
  60 #    endif
  61
  62 #    if defined(HAVE_ARM_NEON)
  63 #      define MOZILLA_MAY_SUPPORT_NEON 1
  64 #    endif
  65
  66 #    if defined(HAVE_ARM_SIMD)
  67 #      define MOZILLA_MAY_SUPPORT_ARMV7 1
  68 #    endif
  69 #  endif
  70
  71 // Currently we only have CPU detection for Linux via /proc/cpuinfo
  72 #  if defined(__linux__) || defined(ANDROID)
  73 #    define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
  74 #  endif
  75
  76 #endif
  77
  78 // When using -mfpu=neon on arm gcc, or using default on aarch64,
  79 // the compiler generates neon instructions.
  80 #if defined(__ARM_NEON)
  81 #  define MOZILLA_PRESUME_NEON 1
  82 #endif
  83
  84 #if defined(__ARM_FEATURE_CRYPTO)
  85 #  define MOZILLA_PRESUME_ARM_AES 1
  86 #endif
  87
  88 namespace mozilla {
  89
  90 namespace arm_private {
  91 #if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
  92 #  if !defined(MOZILLA_PRESUME_EDSP)
  93 extern bool MFBT_DATA edsp_enabled;
  94 #  endif
  95 #  if !defined(MOZILLA_PRESUME_ARMV6)
  96 extern bool MFBT_DATA armv6_enabled;
  97 #  endif
  98 #  if !defined(MOZILLA_PRESUME_ARMV7)
  99 extern bool MFBT_DATA armv7_enabled;
 100 #  endif
 101 #  if !defined(MOZILLA_PRESUME_NEON)
 102 extern bool MFBT_DATA neon_enabled;
 103 #  endif
 104 #  if !defined(MOZILLA_PRESUME_ARM_AES)
 105 extern bool MFBT_DATA aes_enabled;
 106 #  endif
 107 #endif
 108 }  // namespace arm_private
 109
 110 #if defined(MOZILLA_PRESUME_EDSP)
 111 #  define MOZILLA_MAY_SUPPORT_EDSP 1
 112 inline bool supports_edsp() { return true; }
 113 #elif defined(MOZILLA_MAY_SUPPORT_EDSP) && \
 114     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 115 inline bool supports_edsp() { return arm_private::edsp_enabled; }
 116 #else
 117 inline bool supports_edsp() { return false; }
 118 #endif
 119
 120 #if defined(MOZILLA_PRESUME_ARMV6)
 121 #  define MOZILLA_MAY_SUPPORT_ARMV6 1
 122 inline bool supports_armv6() { return true; }
 123 #elif defined(MOZILLA_MAY_SUPPORT_ARMV6) && \
 124     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 125 inline bool supports_armv6() { return arm_private::armv6_enabled; }
 126 #else
 127 inline bool supports_armv6() { return false; }
 128 #endif
 129
 130 #if defined(MOZILLA_PRESUME_ARMV7)
 131 #  define MOZILLA_MAY_SUPPORT_ARMV7 1
 132 inline bool supports_armv7() { return true; }
 133 #elif defined(MOZILLA_MAY_SUPPORT_ARMV7) && \
 134     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 135 inline bool supports_armv7() { return arm_private::armv7_enabled; }
 136 #else
 137 inline bool supports_armv7() { return false; }
 138 #endif
 139
 140 #if defined(MOZILLA_PRESUME_NEON)
 141 #  define MOZILLA_MAY_SUPPORT_NEON 1
 142 inline bool supports_neon() { return true; }
 143 #elif defined(MOZILLA_MAY_SUPPORT_NEON) && \
 144     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 145 inline bool supports_neon() { return arm_private::neon_enabled; }
 146 #else
 147 inline bool supports_neon() { return false; }
 148 #endif
 149 #if defined(MOZILLA_PRESUME_ARM_AES)
 150 inline bool supports_arm_aes() { return true; }
 151 #elif defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 152 inline bool supports_arm_aes() { return arm_private::aes_enabled; }
 153 #else
 154 inline bool supports_arm_aes() { return false; }
 155 #endif
 156
 157 }  // namespace mozilla
 158
 159 #endif /* !defined(mozilla_arm_h_) */