xpcom/glue/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 NS_COM_GLUE
  11 #include "nscore.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 #  if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
  57 #    define MOZILLA_MAY_SUPPORT_EDSP 1
  58 #  endif
  59
  60 #  if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
  61 #    if defined(HAVE_ARM_SIMD)
  62 #      define MOZILLA_MAY_SUPPORT_ARMV6 1
  63 #    endif
  64 #  endif
  65
  66   // Technically 4.2.x only works in the CodeSourcery releases, but I don't
  67   // know how to detect those separately from mainline gcc (which got support
  68   // in 4.3). The Maemo version 5 SDK shipped with the CodeSourcery 4.2.1
  69   // release, which we need to work.
  70 #  if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
  71 #    if defined(HAVE_ARM_NEON)
  72 #      define MOZILLA_MAY_SUPPORT_NEON 1
  73 #    endif
  74 #  endif
  75
  76   // ARMv7 support was merged in gcc 4.3.
  77 #  if __GNUC__> 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
  78 #    if defined(HAVE_ARM_SIMD)
  79 #      define MOZILLA_MAY_SUPPORT_ARMV7 1
  80 #    endif
  81 #  endif
  82
  83   // When using -mfpu=neon, gcc generates neon instructions.
  84
  85 #  if defined(__ARM_NEON__)
  86 #    define MOZILLA_PRESUME_NEON 1
  87 #  endif
  88
  89   // Currently we only have CPU detection for Linux via /proc/cpuinfo
  90 #  if defined(__linux__) || defined(ANDROID)
  91 #    define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
  92 #  endif
  93
  94 #elif defined(_MSC_VER) && defined(_M_ARM)
  95
  96 #  define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
  97   // _M_ARM on MSVC has current cpu architecture.
  98 #  define MOZILLA_ARM_ARCH _M_ARM
  99
 100   // MSVC only allows external asm for ARM, so we don't have to rely on
 101   // compiler support.
 102 #  define MOZILLA_MAY_SUPPORT_EDSP 1
 103 #  if defined(HAVE_ARM_SIMD)
 104 #    define MOZILLA_MAY_SUPPORT_ARMV6 1
 105 #    define MOZILLA_MAY_SUPPORT_ARMV7 1
 106 #  endif
 107 #  if defined(HAVE_ARM_NEON)
 108 #    define MOZILLA_MAY_SUPPORT_NEON 1
 109 #  endif
 110
 111 #endif
 112
 113 namespace mozilla {
 114
 115   namespace arm_private {
 116 #if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 117 #if !defined(MOZILLA_PRESUME_EDSP)
 118     extern bool NS_COM_GLUE edsp_enabled;
 119 #endif
 120 #if !defined(MOZILLA_PRESUME_ARMV6)
 121     extern bool NS_COM_GLUE armv6_enabled;
 122 #endif
 123 #if !defined(MOZILLA_PRESUME_ARMV7)
 124     extern bool NS_COM_GLUE armv7_enabled;
 125 #endif
 126 #if !defined(MOZILLA_PRESUME_NEON)
 127     extern bool NS_COM_GLUE neon_enabled;
 128 #endif
 129 #endif
 130   }
 131
 132 #if defined(MOZILLA_PRESUME_EDSP)
 133 #  define MOZILLA_MAY_SUPPORT_EDSP 1
 134   inline bool supports_edsp() { return true; }
 135 #elif defined(MOZILLA_MAY_SUPPORT_EDSP) \
 136    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 137   inline bool supports_edsp() { return arm_private::edsp_enabled; }
 138 #else
 139   inline bool supports_edsp() { return false; }
 140 #endif
 141
 142 #if defined(MOZILLA_PRESUME_ARMV6)
 143 #  define MOZILLA_MAY_SUPPORT_ARMV6 1
 144   inline bool supports_armv6() { return true; }
 145 #elif defined(MOZILLA_MAY_SUPPORT_ARMV6) \
 146    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 147   inline bool supports_armv6() { return arm_private::armv6_enabled; }
 148 #else
 149   inline bool supports_armv6() { return false; }
 150 #endif
 151
 152 #if defined(MOZILLA_PRESUME_ARMV7)
 153 #  define MOZILLA_MAY_SUPPORT_ARMV7 1
 154   inline bool supports_armv7() { return true; }
 155 #elif defined(MOZILLA_MAY_SUPPORT_ARMV7) \
 156    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 157   inline bool supports_armv7() { return arm_private::armv7_enabled; }
 158 #else
 159   inline bool supports_armv7() { return false; }
 160 #endif
 161
 162 #if defined(MOZILLA_PRESUME_NEON)
 163 #  define MOZILLA_MAY_SUPPORT_NEON 1
 164   inline bool supports_neon() { return true; }
 165 #elif defined(MOZILLA_MAY_SUPPORT_NEON) \
 166    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
 167   inline bool supports_neon() { return arm_private::neon_enabled; }
 168 #else
 169   inline bool supports_neon() { return false; }
 170 #endif
 171
 172 }
 173
 174 #endif /* !defined(mozilla_arm_h_) */