LCOV - app.info - objdir/dist/include/mozilla/SSE.h

LCOV - code coverage report
| Current view: | directory - objdir/dist/include/mozilla - SSE.h (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 8 | 8 | 100.0 %
| Date: | 2012-04-21 | Functions: | 8 | 8 | 100.0 %

           1                 : /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
           2                 : /* ***** BEGIN LICENSE BLOCK *****
           3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           4                 :  *
           5                 :  * The contents of this file are subject to the Mozilla Public License Version
           6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           7                 :  * the License. You may obtain a copy of the License at
           8                 :  * http://www.mozilla.org/MPL/
           9                 :  *
          10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          12                 :  * for the specific language governing rights and limitations under the
          13                 :  * License.
          14                 :  *
          15                 :  * The Original Code is SSE.h
          16                 :  *
          17                 :  * The Initial Developer of the Original Code is the Mozilla Foundation.
          18                 :  * Portions created by the Initial Developer are Copyright (C) 2009
          19                 :  * the Initial Developer. All Rights Reserved.
          20                 :  *
          21                 :  * Contributor(s):
          22                 :  *   L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
          23                 :  *   Justin Lebar <justin.lebar@gmail.com>, Mozilla Corporation
          24                 :  *
          25                 :  * Alternatively, the contents of this file may be used under the terms of
          26                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          27                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          28                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          29                 :  * of those above. If you wish to allow use of your version of this file only
          30                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          31                 :  * use your version of this file under the terms of the MPL, indicate your
          32                 :  * decision by deleting the provisions above and replace them with the notice
          33                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          34                 :  * the provisions above, a recipient may use your version of this file under
          35                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          36                 :  *
          37                 :  * ***** END LICENSE BLOCK ***** */
          38                 :
          39                 : /* compile-time and runtime tests for whether to use SSE instructions */
          40                 :
          41                 : #ifndef mozilla_SSE_h_
          42                 : #define mozilla_SSE_h_
          43                 :
          44                 : // for definition of NS_COM_GLUE
          45                 : #include "nscore.h"
          46                 :
          47                 : /**
          48                 :  * The public interface of this header consists of a set of macros and
          49                 :  * functions for Intel CPU features.
          50                 :  *
          51                 :  * DETECTING ISA EXTENSIONS
          52                 :  * ========================
          53                 :  *
          54                 :  * This header provides the following functions for determining whether the
          55                 :  * current CPU supports a particular instruction set extension:
          56                 :  *
          57                 :  *    mozilla::supports_mmx
          58                 :  *    mozilla::supports_sse
          59                 :  *    mozilla::supports_sse2
          60                 :  *    mozilla::supports_sse3
          61                 :  *    mozilla::supports_ssse3
          62                 :  *    mozilla::supports_sse4a
          63                 :  *    mozilla::supports_sse4_1
          64                 :  *    mozilla::supports_sse4_2
          65                 :  *
          66                 :  * If you're writing code using inline assembly, you should guard it with a
          67                 :  * call to one of these functions.  For instance:
          68                 :  *
          69                 :  *   if (mozilla::supports_sse2()) {
          70                 :  *     asm(" ... ");
          71                 :  *   }
          72                 :  *   else {
          73                 :  *     ...
          74                 :  *   }
          75                 :  *
          76                 :  * Note that these functions depend on cpuid intrinsics only available in gcc
          77                 :  * 4.3 or later and MSVC 8.0 (Visual C++ 2005) or later, so they return false
          78                 :  * in older compilers.  (This could be fixed by replacing the code with inline
          79                 :  * assembly.)
          80                 :  *
          81                 :  *
          82                 :  * USING INTRINSICS
          83                 :  * ================
          84                 :  *
          85                 :  * This header also provides support for coding using CPU intrinsics.
          86                 :  *
          87                 :  * For each mozilla::supports_abc function, we define a MOZILLA_MAY_SUPPORT_ABC
          88                 :  * macro which indicates that the target/compiler combination we're using is
          89                 :  * compatible with the ABC extension.  For instance, x86_64 with MSVC 2003 is
          90                 :  * compatible with SSE2 but not SSE3, since although there exist x86_64 CPUs
          91                 :  * with SSE3 support, MSVC 2003 only supports through SSE2.
          92                 :  *
          93                 :  * Until gcc fixes #pragma target [1] [2] or our x86 builds require SSE2,
          94                 :  * you'll need to separate code using intrinsics into a file separate from your
          95                 :  * regular code.  Here's the recommended pattern:
          96                 :  *
          97                 :  *  #ifdef MOZILLA_MAY_SUPPORT_ABC
          98                 :  *    namespace mozilla {
          99                 :  *      namespace ABC {
         100                 :  *        void foo();
         101                 :  *      }
         102                 :  *    }
         103                 :  *  #endif
         104                 :  *
         105                 :  *  void foo() {
         106                 :  *    #ifdef MOZILLA_MAY_SUPPORT_ABC
         107                 :  *      if (mozilla::supports_abc()) {
         108                 :  *        mozilla::ABC::foo(); // in a separate file
         109                 :  *        return;
         110                 :  *      }
         111                 :  *    #endif
         112                 :  *
         113                 :  *    foo_unvectorized();
         114                 :  *  }
         115                 :  *
         116                 :  * You'll need to define mozilla::ABC::foo() in a separate file and add the
         117                 :  * -mabc flag when using gcc.
         118                 :  *
         119                 :  * [1] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39787 and
         120                 :  * [2] http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41201 being fixed.
         121                 :  *
         122                 :  */
         123                 :
         124                 : #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
         125                 :
         126                 : #ifdef __MMX__
         127                 :   // It's ok to use MMX instructions based on the -march option (or
         128                 :   // the default for x86_64 or for Intel Mac).
         129                 :   #define MOZILLA_PRESUME_MMX 1
         130                 : #endif
         131                 : #ifdef __SSE__
         132                 :   // It's ok to use SSE instructions based on the -march option (or
         133                 :   // the default for x86_64 or for Intel Mac).
         134                 :   #define MOZILLA_PRESUME_SSE 1
         135                 : #endif
         136                 : #ifdef __SSE2__
         137                 :   // It's ok to use SSE2 instructions based on the -march option (or
         138                 :   // the default for x86_64 or for Intel Mac).
         139                 :   #define MOZILLA_PRESUME_SSE2 1
         140                 : #endif
         141                 : #ifdef __SSE3__
         142                 :   // It's ok to use SSE3 instructions based on the -march option (or the
         143                 :   // default for Intel Mac).
         144                 :   #define MOZILLA_PRESUME_SSE3 1
         145                 : #endif
         146                 : #ifdef __SSSE3__
         147                 :   // It's ok to use SSSE3 instructions based on the -march option.
         148                 :   #define MOZILLA_PRESUME_SSSE3 1
         149                 : #endif
         150                 : #ifdef __SSE4A__
         151                 :   // It's ok to use SSE4A instructions based on the -march option.
         152                 :   #define MOZILLA_PRESUME_SSE4A 1
         153                 : #endif
         154                 : #ifdef __SSE4_1__
         155                 :   // It's ok to use SSE4.1 instructions based on the -march option.
         156                 :   #define MOZILLA_PRESUME_SSE4_1 1
         157                 : #endif
         158                 : #ifdef __SSE4_2__
         159                 :   // It's ok to use SSE4.2 instructions based on the -march option.
         160                 :   #define MOZILLA_PRESUME_SSE4_2 1
         161                 : #endif
         162                 :
         163                 : #ifdef HAVE_CPUID_H
         164                 :   #define MOZILLA_SSE_HAVE_CPUID_DETECTION
         165                 : #endif
         166                 :
         167                 : #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_AMD64))
         168                 :
         169                 : #if _MSC_VER >= 1400
         170                 :   // MSVC 2005 or newer on x86 or amd64
         171                 :   #define MOZILLA_SSE_HAVE_CPUID_DETECTION
         172                 : #endif
         173                 :
         174                 : #if defined(_M_IX86_FP)
         175                 :
         176                 : #if _M_IX86_FP >= 1
         177                 :   // It's ok to use SSE instructions based on the /arch option
         178                 :   #define MOZILLA_PRESUME_SSE
         179                 : #endif
         180                 : #if _M_IX86_FP >= 2
         181                 :   // It's ok to use SSE2 instructions based on the /arch option
         182                 :   #define MOZILLA_PRESUME_SSE2
         183                 : #endif
         184                 :
         185                 : #elif defined(_M_AMD64)
         186                 :   // MSVC for AMD64 doesn't support MMX, so don't presume it here.
         187                 :
         188                 :   // SSE is always available on AMD64.
         189                 :   #define MOZILLA_PRESUME_SSE
         190                 :   // SSE2 is always available on AMD64.
         191                 :   #define MOZILLA_PRESUME_SSE2
         192                 : #endif
         193                 :
         194                 : #elif defined(__SUNPRO_CC) && (defined(__i386) || defined(__x86_64__))
         195                 : // Sun Studio on x86 or amd64
         196                 :
         197                 : #define MOZILLA_SSE_HAVE_CPUID_DETECTION
         198                 :
         199                 : #if defined(__x86_64__)
         200                 :   // MMX is always available on AMD64.
         201                 :   #define MOZILLA_PRESUME_MMX
         202                 :   // SSE is always available on AMD64.
         203                 :   #define MOZILLA_PRESUME_SSE
         204                 :   // SSE2 is always available on AMD64.
         205                 :   #define MOZILLA_PRESUME_SSE2
         206                 : #endif
         207                 :
         208                 : #endif
         209                 :
         210                 : namespace mozilla {
         211                 :
         212                 :   namespace sse_private {
         213                 : #if defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         214                 : #if !defined(MOZILLA_PRESUME_MMX)
         215                 :     extern bool NS_COM_GLUE mmx_enabled;
         216                 : #endif
         217                 : #if !defined(MOZILLA_PRESUME_SSE)
         218                 :     extern bool NS_COM_GLUE sse_enabled;
         219                 : #endif
         220                 : #if !defined(MOZILLA_PRESUME_SSE2)
         221                 :     extern bool NS_COM_GLUE sse2_enabled;
         222                 : #endif
         223                 : #if !defined(MOZILLA_PRESUME_SSE3)
         224                 :     extern bool NS_COM_GLUE sse3_enabled;
         225                 : #endif
         226                 : #if !defined(MOZILLA_PRESUME_SSSE3)
         227                 :     extern bool NS_COM_GLUE ssse3_enabled;
         228                 : #endif
         229                 : #if !defined(MOZILLA_PRESUME_SSE4A)
         230                 :     extern bool NS_COM_GLUE sse4a_enabled;
         231                 : #endif
         232                 : #if !defined(MOZILLA_PRESUME_SSE4_1)
         233                 :     extern bool NS_COM_GLUE sse4_1_enabled;
         234                 : #endif
         235                 : #if !defined(MOZILLA_PRESUME_SSE4_2)
         236                 :     extern bool NS_COM_GLUE sse4_2_enabled;
         237                 : #endif
         238                 : #endif
         239                 :   }
         240                 :
         241                 : #if defined(MOZILLA_PRESUME_MMX)
         242                 : #define MOZILLA_MAY_SUPPORT_MMX 1
         243                 :   inline bool supports_mmx() { return true; }
         244                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         245                 : #if !(defined(_MSC_VER) && defined(_M_AMD64))
         246                 :   // Define MOZILLA_MAY_SUPPORT_MMX only if we're not on MSVC for
         247                 :   // AMD64, since that compiler doesn't support MMX.
         248                 : #define MOZILLA_MAY_SUPPORT_MMX 1
         249                 : #endif
         250             229 :   inline bool supports_mmx() { return sse_private::mmx_enabled; }
         251                 : #else
         252                 :   inline bool supports_mmx() { return false; }
         253                 : #endif
         254                 :
         255                 : #if defined(MOZILLA_PRESUME_SSE)
         256                 : #define MOZILLA_MAY_SUPPORT_SSE 1
         257                 :   inline bool supports_sse() { return true; }
         258                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         259                 : #define MOZILLA_MAY_SUPPORT_SSE 1
         260             229 :   inline bool supports_sse() { return sse_private::sse_enabled; }
         261                 : #else
         262                 :   inline bool supports_sse() { return false; }
         263                 : #endif
         264                 :
         265                 : #if defined(MOZILLA_PRESUME_SSE2)
         266                 : #define MOZILLA_MAY_SUPPORT_SSE2 1
         267                 :   inline bool supports_sse2() { return true; }
         268                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         269                 : #define MOZILLA_MAY_SUPPORT_SSE2 1
         270         1408123 :   inline bool supports_sse2() { return sse_private::sse2_enabled; }
         271                 : #else
         272                 :   inline bool supports_sse2() { return false; }
         273                 : #endif
         274                 :
         275                 : #if defined(MOZILLA_PRESUME_SSE3)
         276                 : #define MOZILLA_MAY_SUPPORT_SSE3 1
         277                 :   inline bool supports_sse3() { return true; }
         278                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         279                 : #define MOZILLA_MAY_SUPPORT_SSE3 1
         280             229 :   inline bool supports_sse3() { return sse_private::sse3_enabled; }
         281                 : #else
         282                 :   inline bool supports_sse3() { return false; }
         283                 : #endif
         284                 :
         285                 : #if defined(MOZILLA_PRESUME_SSSE3)
         286                 : #define MOZILLA_MAY_SUPPORT_SSSE3 1
         287                 :   inline bool supports_ssse3() { return true; }
         288                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         289                 : #define MOZILLA_MAY_SUPPORT_SSSE3 1
         290             229 :   inline bool supports_ssse3() { return sse_private::ssse3_enabled; }
         291                 : #else
         292                 :   inline bool supports_ssse3() { return false; }
         293                 : #endif
         294                 :
         295                 : #if defined(MOZILLA_PRESUME_SSE4A)
         296                 : #define MOZILLA_MAY_SUPPORT_SSE4A 1
         297                 :   inline bool supports_sse4a() { return true; }
         298                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         299                 : #define MOZILLA_MAY_SUPPORT_SSE4A 1
         300             229 :   inline bool supports_sse4a() { return sse_private::sse4a_enabled; }
         301                 : #else
         302                 :   inline bool supports_sse4a() { return false; }
         303                 : #endif
         304                 :
         305                 : #if defined(MOZILLA_PRESUME_SSE4_1)
         306                 : #define MOZILLA_MAY_SUPPORT_SSE4_1 1
         307                 :   inline bool supports_sse4_1() { return true; }
         308                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         309                 : #define MOZILLA_MAY_SUPPORT_SSE4_1 1
         310             229 :   inline bool supports_sse4_1() { return sse_private::sse4_1_enabled; }
         311                 : #else
         312                 :   inline bool supports_sse4_1() { return false; }
         313                 : #endif
         314                 :
         315                 : #if defined(MOZILLA_PRESUME_SSE4_2)
         316                 : #define MOZILLA_MAY_SUPPORT_SSE4_2 1
         317                 :   inline bool supports_sse4_2() { return true; }
         318                 : #elif defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
         319                 : #define MOZILLA_MAY_SUPPORT_SSE4_2 1
         320             229 :   inline bool supports_sse4_2() { return sse_private::sse4_2_enabled; }
         321                 : #else
         322                 :   inline bool supports_sse4_2() { return false; }
         323                 : #endif
         324                 :
         325                 : }
         326                 :
         327                 : #endif /* !defined(mozilla_SSE_h_) */

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