mozglue/build/SSE.h

   1 /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /* compile-time and runtime tests for whether to use SSE instructions */
   7
   8 #ifndef mozilla_SSE_h_
   9 #define mozilla_SSE_h_
  10
  11 // for definition of MFBT_DATA
  12 #include "mozilla/Types.h"
  13
  14 /**
  15  * The public interface of this header consists of a set of macros and
  16  * functions for Intel CPU features.
  17  *
  18  * DETECTING ISA EXTENSIONS
  19  * ========================
  20  *
  21  * This header provides the following functions for determining whether the
  22  * current CPU supports a particular instruction set extension:
  23  *
  24  *    mozilla::supports_mmx
  25  *    mozilla::supports_sse
  26  *    mozilla::supports_sse2
  27  *    mozilla::supports_sse3
  28  *    mozilla::supports_ssse3
  29  *    mozilla::supports_sse4a
  30  *    mozilla::supports_sse4_1
  31  *    mozilla::supports_sse4_2
  32  *    mozilla::supports_avx
  33  *    mozilla::supports_avx2
  34  *    mozilla::supports_aes
  35  *
  36  * If you're writing code using inline assembly, you should guard it with a
  37  * call to one of these functions.  For instance:
  38  *
  39  *   if (mozilla::supports_sse2()) {
  40  *     asm(" ... ");
  41  *   }
  42  *   else {
  43  *     ...
  44  *   }
  45  *
  46  * Note that these functions depend on cpuid intrinsics only available in gcc
  47  * 4.3 or later and MSVC 8.0 (Visual C++ 2005) or later, so they return false
  48  * in older compilers.  (This could be fixed by replacing the code with inline
  49  * assembly.)
  50  *
  51  *
  52  * USING INTRINSICS
  53  * ================
  54  *
  55  * This header also provides support for coding using CPU intrinsics.
  56  *
  57  * For each mozilla::supports_abc function, we define a MOZILLA_MAY_SUPPORT_ABC
  58  * macro which indicates that the target/compiler combination we're using is
  59  * compatible with the ABC extension.  For instance, x86_64 with MSVC 2003 is
  60  * compatible with SSE2 but not SSE3, since although there exist x86_64 CPUs
  61  * with SSE3 support, MSVC 2003 only supports through SSE2.
  62  *
  63  * Until gcc fixes #pragma target [1] [2] or our x86 builds require SSE2,
  64  * you'll need to separate code using intrinsics into a file separate from your
  65  * regular code.  Here's the recommended pattern:
  66  *
  67  *  #ifdef MOZILLA_MAY_SUPPORT_ABC
  68  *    namespace mozilla {
  69  *      namespace ABC {
  70  *        void foo();
  71  *      }
  72  *    }
  73  *  #endif
  74  *
  75  *  void foo() {
  76  *    #ifdef MOZILLA_MAY_SUPPORT_ABC
  77  *      if (mozilla::supports_abc()) {
  78  *        mozilla::ABC::foo(); // in a separate file
  79  *        return;
  80  *      }
  81  *    #endif
  82  *
  83  *    foo_unvectorized();
  84  *  }
  85  *
  86  * You'll need to define mozilla::ABC::foo() in a separate file and add the
  87  * -mabc flag when using gcc.
  88  *
  89  * [1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39787 and
  90  * [2] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41201 being fixed.
  91  *
  92  */
  93
  94 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
  95
  96 #  ifdef __MMX__
  97 // It's ok to use MMX instructions based on the -march option (or
  98 // the default for x86_64 or for Intel Mac).
  99 #    define MOZILLA_PRESUME_MMX 1
 100 #  endif
 101 #  ifdef __SSE__
 102 // It's ok to use SSE instructions based on the -march option (or
 103 // the default for x86_64 or for Intel Mac).
 104 #    define MOZILLA_PRESUME_SSE 1
 105 #  endif
 106 #  ifdef __SSE2__
 107 // It's ok to use SSE2 instructions based on the -march option (or
 108 // the default for x86_64 or for Intel Mac).
 109 #    define MOZILLA_PRESUME_SSE2 1
 110 #  endif
 111 #  ifdef __SSE3__
 112 // It's ok to use SSE3 instructions based on the -march option (or the
 113 // default for Intel Mac).
 114 #    define MOZILLA_PRESUME_SSE3 1
 115 #  endif
 116 #  ifdef __SSSE3__
 117 // It's ok to use SSSE3 instructions based on the -march option.
 118 #    define MOZILLA_PRESUME_SSSE3 1
 119 #  endif
 120 #  ifdef __SSE4A__
 121 // It's ok to use SSE4A instructions based on the -march option.
 122 #    define MOZILLA_PRESUME_SSE4A 1
 123 #  endif
 124 #  ifdef __SSE4_1__
 125 // It's ok to use SSE4.1 instructions based on the -march option.
 126 #    define MOZILLA_PRESUME_SSE4_1 1
 127 #  endif
 128 #  ifdef __SSE4_2__
 129 // It's ok to use SSE4.2 instructions based on the -march option.
 130 #    define MOZILLA_PRESUME_SSE4_2 1
 131 #  endif
 132 #  ifdef __AVX__
 133 // It's ok to use AVX instructions based on the -march option.
 134 #    define MOZILLA_PRESUME_AVX 1
 135 #  endif
 136 #  ifdef __AVX2__
 137 // It's ok to use AVX instructions based on the -march option.
 138 #    define MOZILLA_PRESUME_AVX2 1
 139 #  endif
 140 #  ifdef __AES__
 141 // It's ok to use AES instructions based on the -march option.
 142 #    define MOZILLA_PRESUME_AES 1
 143 #  endif
 144
 145 #  ifdef HAVE_CPUID_H
 146 #    define MOZILLA_SSE_HAVE_CPUID_DETECTION
 147 #  endif
 148
 149 #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_AMD64))
 150
 151 #  define MOZILLA_SSE_HAVE_CPUID_DETECTION
 152
 153 #  if defined(_M_IX86_FP)
 154
 155 #    if _M_IX86_FP >= 1
 156 // It's ok to use SSE instructions based on the /arch option
 157 #      define MOZILLA_PRESUME_SSE
 158 #    endif
 159 #    if _M_IX86_FP >= 2
 160 // It's ok to use SSE2 instructions based on the /arch option
 161 #      define MOZILLA_PRESUME_SSE2
 162 #    endif
 163
 164 #  elif defined(_M_AMD64)
 165 // MSVC for AMD64 doesn't support MMX, so don't presume it here.
 166
 167 // SSE is always available on AMD64.
 168 #    define MOZILLA_PRESUME_SSE
 169 // SSE2 is always available on AMD64.
 170 #    define MOZILLA_PRESUME_SSE2
 171 #  endif
 172
 173 #elif defined(__SUNPRO_CC) && (defined(__i386) || defined(__x86_64__))
 174 // Sun Studio on x86 or amd64
 175
 176 #  define MOZILLA_SSE_HAVE_CPUID_DETECTION
 177
 178 #  if defined(__x86_64__)
 179 // MMX is always available on AMD64.
 180 #    define MOZILLA_PRESUME_MMX
 181 // SSE is always available on AMD64.
 182 #    define MOZILLA_PRESUME_SSE
 183 // SSE2 is always available on AMD64.
 184 #    define MOZILLA_PRESUME_SSE2
 185 #  endif
 186
 187 #endif
 188
 189 namespace mozilla {
 190
 191 namespace sse_private {
 192 #if defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 193 #  if !defined(MOZILLA_PRESUME_MMX)
 194 extern bool MFBT_DATA mmx_enabled;
 195 #  endif
 196 #  if !defined(MOZILLA_PRESUME_SSE)
 197 extern bool MFBT_DATA sse_enabled;
 198 #  endif
 199 #  if !defined(MOZILLA_PRESUME_SSE2)
 200 extern bool MFBT_DATA sse2_enabled;
 201 #  endif
 202 #  if !defined(MOZILLA_PRESUME_SSE3)
 203 extern bool MFBT_DATA sse3_enabled;
 204 #  endif
 205 #  if !defined(MOZILLA_PRESUME_SSSE3)
 206 extern bool MFBT_DATA ssse3_enabled;
 207 #  endif
 208 #  if !defined(MOZILLA_PRESUME_SSE4A)
 209 extern bool MFBT_DATA sse4a_enabled;
 210 #  endif
 211 #  if !defined(MOZILLA_PRESUME_SSE4_1)
 212 extern bool MFBT_DATA sse4_1_enabled;
 213 #  endif
 214 #  if !defined(MOZILLA_PRESUME_SSE4_2)
 215 extern bool MFBT_DATA sse4_2_enabled;
 216 #  endif
 217 #  if !defined(MOZILLA_PRESUME_AVX)
 218 extern bool MFBT_DATA avx_enabled;
 219 #  endif
 220 #  if !defined(MOZILLA_PRESUME_AVX2)
 221 extern bool MFBT_DATA avx2_enabled;
 222 #  endif
 223 #  if !defined(MOZILLA_PRESUME_AES)
 224 extern bool MFBT_DATA aes_enabled;
 225 #  endif
 226
 227 #endif
 228 }  // namespace sse_private
 229
 230 #if defined(MOZILLA_PRESUME_MMX)
 231 #  define MOZILLA_MAY_SUPPORT_MMX 1
 232 inline bool supports_mmx() { return true; }
 233 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 234 #  if !(defined(_MSC_VER) && defined(_M_AMD64))
 235 // Define MOZILLA_MAY_SUPPORT_MMX only if we're not on MSVC for
 236 // AMD64, since that compiler doesn't support MMX.
 237 #    define MOZILLA_MAY_SUPPORT_MMX 1
 238 #  endif
 239 inline bool supports_mmx() { return sse_private::mmx_enabled; }
 240 #else
 241 inline bool supports_mmx() { return false; }
 242 #endif
 243
 244 #if defined(MOZILLA_PRESUME_SSE)
 245 #  define MOZILLA_MAY_SUPPORT_SSE 1
 246 inline bool supports_sse() { return true; }
 247 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 248 #  define MOZILLA_MAY_SUPPORT_SSE 1
 249 inline bool supports_sse() { return sse_private::sse_enabled; }
 250 #else
 251 inline bool supports_sse() { return false; }
 252 #endif
 253
 254 #if defined(MOZILLA_PRESUME_SSE2)
 255 #  define MOZILLA_MAY_SUPPORT_SSE2 1
 256 inline bool supports_sse2() { return true; }
 257 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 258 #  define MOZILLA_MAY_SUPPORT_SSE2 1
 259 inline bool supports_sse2() { return sse_private::sse2_enabled; }
 260 #else
 261 inline bool supports_sse2() { return false; }
 262 #endif
 263
 264 #if defined(MOZILLA_PRESUME_SSE3)
 265 #  define MOZILLA_MAY_SUPPORT_SSE3 1
 266 inline bool supports_sse3() { return true; }
 267 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 268 #  define MOZILLA_MAY_SUPPORT_SSE3 1
 269 inline bool supports_sse3() { return sse_private::sse3_enabled; }
 270 #else
 271 inline bool supports_sse3() { return false; }
 272 #endif
 273
 274 #if defined(MOZILLA_PRESUME_SSSE3)
 275 #  define MOZILLA_MAY_SUPPORT_SSSE3 1
 276 inline bool supports_ssse3() { return true; }
 277 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 278 #  define MOZILLA_MAY_SUPPORT_SSSE3 1
 279 inline bool supports_ssse3() { return sse_private::ssse3_enabled; }
 280 #else
 281 inline bool supports_ssse3() { return false; }
 282 #endif
 283
 284 #if defined(MOZILLA_PRESUME_SSE4A)
 285 #  define MOZILLA_MAY_SUPPORT_SSE4A 1
 286 inline bool supports_sse4a() { return true; }
 287 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 288 #  define MOZILLA_MAY_SUPPORT_SSE4A 1
 289 inline bool supports_sse4a() { return sse_private::sse4a_enabled; }
 290 #else
 291 inline bool supports_sse4a() { return false; }
 292 #endif
 293
 294 #if defined(MOZILLA_PRESUME_SSE4_1)
 295 #  define MOZILLA_MAY_SUPPORT_SSE4_1 1
 296 inline bool supports_sse4_1() { return true; }
 297 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 298 #  define MOZILLA_MAY_SUPPORT_SSE4_1 1
 299 inline bool supports_sse4_1() { return sse_private::sse4_1_enabled; }
 300 #else
 301 inline bool supports_sse4_1() { return false; }
 302 #endif
 303
 304 #if defined(MOZILLA_PRESUME_SSE4_2)
 305 #  define MOZILLA_MAY_SUPPORT_SSE4_2 1
 306 inline bool supports_sse4_2() { return true; }
 307 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 308 #  define MOZILLA_MAY_SUPPORT_SSE4_2 1
 309 inline bool supports_sse4_2() { return sse_private::sse4_2_enabled; }
 310 #else
 311 inline bool supports_sse4_2() { return false; }
 312 #endif
 313
 314 #if defined(MOZILLA_PRESUME_AVX)
 315 #  define MOZILLA_MAY_SUPPORT_AVX 1
 316 inline bool supports_avx() { return true; }
 317 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 318 #  define MOZILLA_MAY_SUPPORT_AVX 1
 319 inline bool supports_avx() { return sse_private::avx_enabled; }
 320 #else
 321 inline bool supports_avx() { return false; }
 322 #endif
 323
 324 #if defined(MOZILLA_PRESUME_AVX2)
 325 #  define MOZILLA_MAY_SUPPORT_AVX2 1
 326 inline bool supports_avx2() { return true; }
 327 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 328 #  define MOZILLA_MAY_SUPPORT_AVX2 1
 329 inline bool supports_avx2() { return sse_private::avx2_enabled; }
 330 #else
 331 inline bool supports_avx2() { return false; }
 332 #endif
 333
 334 #if defined(MOZILLA_PRESUME_AES)
 335 #  define MOZILLA_MAY_SUPPORT_AES 1
 336 inline bool supports_aes() { return true; }
 337 #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
 338 #  define MOZILLA_MAY_SUPPORT_AES 1
 339 inline bool supports_aes() { return sse_private::aes_enabled; }
 340 #else
 341 inline bool supports_aes() { return false; }
 342 #endif
 343
 344 }  // namespace mozilla
 345
 346 #endif /* !defined(mozilla_SSE_h_) */