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 namespace mozilla {
  85
  86 namespace arm_private {
  87 #if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
  88 #  if !defined(MOZILLA_PRESUME_EDSP)
  89 extern bool MFBT_DATA edsp_enabled;
  90 #  endif
  91 #  if !defined(MOZILLA_PRESUME_ARMV6)
  92 extern bool MFBT_DATA armv6_enabled;
  93 #  endif
  94 #  if !defined(MOZILLA_PRESUME_ARMV7)
  95 extern bool MFBT_DATA armv7_enabled;
  96 #  endif
  97 #  if !defined(MOZILLA_PRESUME_NEON)
  98 extern bool MFBT_DATA neon_enabled;
  99 #  endif
 100 #endif
 101 }  // namespace arm_private
 102
 103 #if defined(MOZILLA_PRESUME_EDSP)
 104 #  define MOZILLA_MAY_SUPPORT_EDSP 1
 105 inline bool supports_edsp() { return true; }
 106 #elif defined(MOZILLA_MAY_SUPPORT_EDSP) && \
 107     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 108 inline bool supports_edsp() { return arm_private::edsp_enabled; }
 109 #else
 110 inline bool supports_edsp() { return false; }
 111 #endif
 112
 113 #if defined(MOZILLA_PRESUME_ARMV6)
 114 #  define MOZILLA_MAY_SUPPORT_ARMV6 1
 115 inline bool supports_armv6() { return true; }
 116 #elif defined(MOZILLA_MAY_SUPPORT_ARMV6) && \
 117     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 118 inline bool supports_armv6() { return arm_private::armv6_enabled; }
 119 #else
 120 inline bool supports_armv6() { return false; }
 121 #endif
 122
 123 #if defined(MOZILLA_PRESUME_ARMV7)
 124 #  define MOZILLA_MAY_SUPPORT_ARMV7 1
 125 inline bool supports_armv7() { return true; }
 126 #elif defined(MOZILLA_MAY_SUPPORT_ARMV7) && \
 127     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 128 inline bool supports_armv7() { return arm_private::armv7_enabled; }
 129 #else
 130 inline bool supports_armv7() { return false; }
 131 #endif
 132
 133 #if defined(MOZILLA_PRESUME_NEON)
 134 #  define MOZILLA_MAY_SUPPORT_NEON 1
 135 inline bool supports_neon() { return true; }
 136 #elif defined(MOZILLA_MAY_SUPPORT_NEON) && \
 137     defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 138 inline bool supports_neon() { return arm_private::neon_enabled; }
 139 #else
 140 inline bool supports_neon() { return false; }
 141 #endif
 142
 143 }  // namespace mozilla
 144
 145 #endif /* !defined(mozilla_arm_h_) */