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
  56 #  ifdef __GNUC__
  57 #    define MOZILLA_MAY_SUPPORT_EDSP 1
  58
  59 #    if defined(HAVE_ARM_SIMD)
  60 #      define MOZILLA_MAY_SUPPORT_ARMV6 1
  61 #    endif
  62
  63 #    if defined(HAVE_ARM_NEON)
  64 #      define MOZILLA_MAY_SUPPORT_NEON 1
  65 #    endif
  66
  67 #    if defined(HAVE_ARM_SIMD)
  68 #      define MOZILLA_MAY_SUPPORT_ARMV7 1
  69 #    endif
  70 #  endif
  71
  72   // When using -mfpu=neon, gcc generates neon instructions.
  73
  74 #  if defined(__ARM_NEON__)
  75 #    define MOZILLA_PRESUME_NEON 1
  76 #  endif
  77
  78   // Currently we only have CPU detection for Linux via /proc/cpuinfo
  79 #  if defined(__linux__) || defined(ANDROID)
  80 #    define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
  81 #  endif
  82
  83 #elif defined(_MSC_VER) && defined(_M_ARM)
  84
  85 #  define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
  86   // _M_ARM on MSVC has current cpu architecture.
  87 #  define MOZILLA_ARM_ARCH _M_ARM
  88
  89   // MSVC only allows external asm for ARM, so we don't have to rely on
  90   // compiler support.
  91 #  define MOZILLA_MAY_SUPPORT_EDSP 1
  92 #  if defined(HAVE_ARM_SIMD)
  93 #    define MOZILLA_MAY_SUPPORT_ARMV6 1
  94 #    define MOZILLA_MAY_SUPPORT_ARMV7 1
  95 #  endif
  96 #  if defined(HAVE_ARM_NEON)
  97 #    define MOZILLA_MAY_SUPPORT_NEON 1
  98 #  endif
  99
 100 #endif
 101
 102 namespace mozilla {
 103
 104   namespace arm_private {
 105 #if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 106 #if !defined(MOZILLA_PRESUME_EDSP)
 107     extern bool MFBT_DATA edsp_enabled;
 108 #endif
 109 #if !defined(MOZILLA_PRESUME_ARMV6)
 110     extern bool MFBT_DATA armv6_enabled;
 111 #endif
 112 #if !defined(MOZILLA_PRESUME_ARMV7)
 113     extern bool MFBT_DATA armv7_enabled;
 114 #endif
 115 #if !defined(MOZILLA_PRESUME_NEON)
 116     extern bool MFBT_DATA neon_enabled;
 117 #endif
 118 #endif
 119   }
 120
 121 #if defined(MOZILLA_PRESUME_EDSP)
 122 #  define MOZILLA_MAY_SUPPORT_EDSP 1
 123   inline bool supports_edsp() { return true; }
 124 #elif defined(MOZILLA_MAY_SUPPORT_EDSP) \
 125    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 126   inline bool supports_edsp() { return arm_private::edsp_enabled; }
 127 #else
 128   inline bool supports_edsp() { return false; }
 129 #endif
 130
 131 #if defined(MOZILLA_PRESUME_ARMV6)
 132 #  define MOZILLA_MAY_SUPPORT_ARMV6 1
 133   inline bool supports_armv6() { return true; }
 134 #elif defined(MOZILLA_MAY_SUPPORT_ARMV6) \
 135    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 136   inline bool supports_armv6() { return arm_private::armv6_enabled; }
 137 #else
 138   inline bool supports_armv6() { return false; }
 139 #endif
 140
 141 #if defined(MOZILLA_PRESUME_ARMV7)
 142 #  define MOZILLA_MAY_SUPPORT_ARMV7 1
 143   inline bool supports_armv7() { return true; }
 144 #elif defined(MOZILLA_MAY_SUPPORT_ARMV7) \
 145    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 146   inline bool supports_armv7() { return arm_private::armv7_enabled; }
 147 #else
 148   inline bool supports_armv7() { return false; }
 149 #endif
 150
 151 #if defined(MOZILLA_PRESUME_NEON)
 152 #  define MOZILLA_MAY_SUPPORT_NEON 1
 153   inline bool supports_neon() { return true; }
 154 #elif defined(MOZILLA_MAY_SUPPORT_NEON) \
 155    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 156   inline bool supports_neon() { return arm_private::neon_enabled; }
 157 #else
 158   inline bool supports_neon() { return false; }
 159 #endif
 160
 161 }
 162
 163 #endif /* !defined(mozilla_arm_h_) */