LCOV - code coverage report
Current view: directory - objdir/dist/include/mozilla - arm.h (source / functions) Found Hit Coverage
Test: app.info Lines: 3 3 100.0 %
Date: 2012-06-02 Functions: 3 3 100.0 %

       1                 : /* ***** BEGIN LICENSE BLOCK *****
       2                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       3                 :  *
       4                 :  * The contents of this file are subject to the Mozilla Public License Version
       5                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       6                 :  * the License. You may obtain a copy of the License at
       7                 :  * http://www.mozilla.org/MPL/
       8                 :  *
       9                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      10                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      11                 :  * for the specific language governing rights and limitations under the
      12                 :  * License.
      13                 :  *
      14                 :  * The Original Code is arm.h
      15                 :  *
      16                 :  * The Initial Developer of the Original Code is the Mozilla Foundation.
      17                 :  * Portions created by the Initial Developer are Copyright (C) 2011
      18                 :  * the Initial Developer. All Rights Reserved.
      19                 :  *
      20                 :  * Contributor(s):
      21                 :  *   Timothy B. Terriberry <tterriberry@mozilla.com>
      22                 :  *
      23                 :  * Alternatively, the contents of this file may be used under the terms of
      24                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      25                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      26                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      27                 :  * of those above. If you wish to allow use of your version of this file only
      28                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      29                 :  * use your version of this file under the terms of the MPL, indicate your
      30                 :  * decision by deleting the provisions above and replace them with the notice
      31                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      32                 :  * the provisions above, a recipient may use your version of this file under
      33                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      34                 :  *
      35                 :  * ***** END LICENSE BLOCK ***** */
      36                 : 
      37                 : /* compile-time and runtime tests for whether to use SSE instructions */
      38                 : 
      39                 : #ifndef mozilla_arm_h_
      40                 : #define mozilla_arm_h_
      41                 : 
      42                 : // for definition of NS_COM_GLUE
      43                 : #include "nscore.h"
      44                 : 
      45                 : /* This is patterned after SSE.h, but provides ARMv5E, ARMv6, and NEON
      46                 :    detection. For reasons similar to the SSE code, code using NEON (even just
      47                 :    in inline asm) needs to be in a separate compilation unit from the regular
      48                 :    code, because it requires an ".fpu neon" directive which can't be undone.
      49                 :    ARMv5E and ARMv6 code may also require an .arch directive, since by default
      50                 :    the assembler refuses to generate code for opcodes outside of its current
      51                 :    .arch setting.
      52                 : 
      53                 :    TODO: Add Thumb, Thumb2, VFP, iwMMX, etc. detection, if we need it. */
      54                 : 
      55                 : #if defined(__GNUC__) && defined(__arm__)
      56                 : 
      57                 : #  define MOZILLA_ARM_ARCH 3
      58                 : 
      59                 : #  if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__) \
      60                 :    || defined(_ARM_ARCH_4)
      61                 : #    undef MOZILLA_ARM_ARCH
      62                 : #    define MOZILLA_ARM_ARCH 4
      63                 : #  endif
      64                 : 
      65                 : #  if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
      66                 :    || defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
      67                 :    || defined(__ARM_ARCH_5TEJ__) || defined(_ARM_ARCH_5)
      68                 : #    undef MOZILLA_ARM_ARCH
      69                 : #    define MOZILLA_ARM_ARCH 5
      70                 : #  endif
      71                 : 
      72                 : #  if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
      73                 :    || defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
      74                 :    || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
      75                 :    || defined(__ARM_ARCH_6M__) || defined(_ARM_ARCH_6)
      76                 : #    undef MOZILLA_ARM_ARCH
      77                 : #    define MOZILLA_ARM_ARCH 6
      78                 : #  endif
      79                 : 
      80                 : #  if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
      81                 :    || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
      82                 :    || defined(__ARM_ARCH_7EM__) || defined(_ARM_ARCH_7)
      83                 : #    undef MOZILLA_ARM_ARCH
      84                 : #    define MOZILLA_ARM_ARCH 7
      85                 : #  endif
      86                 : 
      87                 : 
      88                 : #  if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
      89                 : #    define MOZILLA_MAY_SUPPORT_EDSP 1
      90                 : #  endif
      91                 : 
      92                 : #  if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
      93                 : #    if defined(HAVE_ARM_SIMD)
      94                 : #      define MOZILLA_MAY_SUPPORT_ARMV6 1
      95                 : #    endif
      96                 : #  endif
      97                 : 
      98                 :   // Technically 4.2.x only works in the CodeSourcery releases, but I don't
      99                 :   // know how to detect those separately from mainline gcc (which got support
     100                 :   // in 4.3). The Maemo version 5 SDK shipped with the CodeSourcery 4.2.1
     101                 :   // release, which we need to work.
     102                 : #  if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
     103                 : #    if defined(HAVE_ARM_NEON)
     104                 : #      define MOZILLA_MAY_SUPPORT_NEON 1
     105                 : #    endif
     106                 : #  endif
     107                 : 
     108                 :   // Currently we only have CPU detection for Linux via /proc/cpuinfo
     109                 : #  if defined(__linux__) || defined(ANDROID)
     110                 : #    define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
     111                 : #  endif
     112                 : 
     113                 : #elif defined(_MSC_VER) && defined(_M_ARM)
     114                 : 
     115                 : #  define MOZILLA_ARM_HAVE_CPUID_DETECTION 1
     116                 :   // I don't know how to do arch detection at compile time for MSVC, so assume
     117                 :   // the worst for now.
     118                 : #  define MOZILLA_ARM_ARCH 3
     119                 : 
     120                 :   // MSVC only allows external asm for ARM, so we don't have to rely on
     121                 :   // compiler support.
     122                 : #  define MOZILLA_MAY_SUPPORT_EDSP 1
     123                 : #  if defined(HAVE_ARM_SIMD)
     124                 : #    define MOZILLA_MAY_SUPPORT_ARMV6 1
     125                 : #  endif
     126                 : #  if defined(HAVE_ARM_NEON)
     127                 : #    define MOZILLA_MAY_SUPPORT_NEON 1
     128                 : #  endif
     129                 : 
     130                 : #endif
     131                 : 
     132                 : namespace mozilla {
     133                 : 
     134                 :   namespace arm_private {
     135                 : #if defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
     136                 : #if !defined(MOZILLA_PRESUME_EDSP)
     137                 :     extern bool NS_COM_GLUE edsp_enabled;
     138                 : #endif
     139                 : #if !defined(MOZILLA_PRESUME_ARMV6)
     140                 :     extern bool NS_COM_GLUE armv6_enabled;
     141                 : #endif
     142                 : #if !defined(MOZILLA_PRESUME_NEON)
     143                 :     extern bool NS_COM_GLUE neon_enabled;
     144                 : #endif
     145                 : #endif
     146                 :   }
     147                 : 
     148                 : #if defined(MOZILLA_PRESUME_EDSP)
     149                 : #  define MOZILLA_MAY_SUPPORT_EDSP 1
     150                 :   inline bool supports_edsp() { return true; }
     151                 : #elif defined(MOZILLA_MAY_SUPPORT_EDSP) \
     152                 :    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
     153                 :   inline bool supports_edsp() { return arm_private::edsp_enabled; }
     154                 : #else
     155             230 :   inline bool supports_edsp() { return false; }
     156                 : #endif
     157                 : 
     158                 : #if defined(MOZILLA_PRESUME_ARMV6)
     159                 : #  define MOZILLA_MAY_SUPPORT_ARMV6 1
     160                 :   inline bool supports_armv6() { return true; }
     161                 : #elif defined(MOZILLA_MAY_SUPPORT_ARMV6) \
     162                 :    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
     163                 :   inline bool supports_armv6() { return arm_private::armv6_enabled; }
     164                 : #else
     165             230 :   inline bool supports_armv6() { return false; }
     166                 : #endif
     167                 : 
     168                 : #if defined(MOZILLA_PRESUME_NEON)
     169                 : #  define MOZILLA_MAY_SUPPORT_NEON 1
     170                 :   inline bool supports_neon() { return true; }
     171                 : #elif defined(MOZILLA_MAY_SUPPORT_NEON) \
     172                 :    && defined(MOZILLA_ARM_HAVE_CPUID_DETECTION)
     173                 :   inline bool supports_neon() { return arm_private::neon_enabled; }
     174                 : #else
     175             230 :   inline bool supports_neon() { return false; }
     176                 : #endif
     177                 : 
     178                 : }
     179                 : 
     180                 : #endif /* !defined(mozilla_arm_h_) */

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