LCOV - code coverage report
Current view: directory - xpcom/glue - SSE.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 12 12 100.0 %
Date: 2012-06-02 Functions: 4 3 75.0 %

       1                 : /* vim: set shiftwidth=4 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.cpp
      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                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : /* compile-time and runtime tests for whether to use SSE instructions */
      39                 : 
      40                 : #include "SSE.h"
      41                 : 
      42                 : namespace {
      43                 : 
      44                 : // SSE.h has parallel #ifs which declare MOZILLA_SSE_HAVE_CPUID_DETECTION.
      45                 : // We can't declare these functions in the header file, however, because
      46                 : // <intrin.h> conflicts with <windows.h> on MSVC 2005, and some files want to
      47                 : // include both SSE.h and <windows.h>.
      48                 : 
      49                 : #ifdef HAVE_CPUID_H
      50                 : 
      51                 : // cpuid.h is available on gcc 4.3 and higher on i386 and x86_64
      52                 : #include <cpuid.h>
      53                 : 
      54                 : enum CPUIDRegister { eax = 0, ebx = 1, ecx = 2, edx = 3 };
      55                 : 
      56                 : static bool
      57               8 : has_cpuid_bit(unsigned int level, CPUIDRegister reg, unsigned int bit)
      58                 : {
      59                 :   unsigned int regs[4];
      60               8 :   return __get_cpuid(level, &regs[0], &regs[1], &regs[2], &regs[3]) &&
      61               8 :          (regs[reg] & bit);
      62                 : }
      63                 : 
      64                 : #elif defined(_MSC_VER) && _MSC_VER >= 1400 && (defined(_M_IX86) || defined(_M_AMD64))
      65                 : 
      66                 : // MSVC 2005 or newer on x86-32 or x86-64
      67                 : #include <intrin.h>
      68                 : 
      69                 : enum CPUIDRegister { eax = 0, ebx = 1, ecx = 2, edx = 3 };
      70                 : 
      71                 : static bool
      72                 : has_cpuid_bit(unsigned int level, CPUIDRegister reg, unsigned int bit)
      73                 : {
      74                 :   // Check that the level in question is supported.
      75                 :   int regs[4];
      76                 :   __cpuid(regs, level & 0x80000000u);
      77                 :   if (unsigned(regs[0]) < level)
      78                 :     return false;
      79                 : 
      80                 :   __cpuid(regs, level);
      81                 :   return !!(unsigned(regs[reg]) & bit);
      82                 : }
      83                 : 
      84                 : #elif defined(__SUNPRO_CC) && (defined(__i386) || defined(__x86_64__))
      85                 : 
      86                 : enum CPUIDRegister { eax = 0, ebx = 1, ecx = 2, edx = 3 };
      87                 : 
      88                 : #ifdef __i386
      89                 : static void
      90                 : moz_cpuid(int CPUInfo[4], int InfoType)
      91                 : {
      92                 :   asm (
      93                 :     "xchg %esi, %ebx\n"
      94                 :     "cpuid\n"
      95                 :     "movl %eax, (%edi)\n"
      96                 :     "movl %ebx, 4(%edi)\n"
      97                 :     "movl %ecx, 8(%edi)\n"
      98                 :     "movl %edx, 12(%edi)\n"
      99                 :     "xchg %esi, %ebx\n"
     100                 :     :
     101                 :     : "a"(InfoType), // %eax
     102                 :       "D"(CPUInfo) // %edi
     103                 :     : "%ecx", "%edx", "%esi"
     104                 :   );
     105                 : }
     106                 : #else
     107                 : static void
     108                 : moz_cpuid(int CPUInfo[4], int InfoType)
     109                 : {
     110                 :   asm (
     111                 :     "xchg %rsi, %rbx\n"
     112                 :     "cpuid\n"
     113                 :     "movl %eax, (%rdi)\n"
     114                 :     "movl %ebx, 4(%rdi)\n"
     115                 :     "movl %ecx, 8(%rdi)\n"
     116                 :     "movl %edx, 12(%rdi)\n"
     117                 :     "xchg %rsi, %rbx\n"
     118                 :     :
     119                 :     : "a"(InfoType), // %eax
     120                 :       "D"(CPUInfo) // %rdi
     121                 :     : "%ecx", "%edx", "%rsi"
     122                 :   );
     123                 : }
     124                 : #endif
     125                 : 
     126                 : static bool
     127                 : has_cpuid_bit(unsigned int level, CPUIDRegister reg, unsigned int bit)
     128                 : {
     129                 :   // Check that the level in question is supported.
     130                 :   volatile int regs[4];
     131                 :   moz_cpuid((int *)regs, level & 0x80000000u);
     132                 :   if (unsigned(regs[0]) < level)
     133                 :     return false;
     134                 : 
     135                 :   moz_cpuid((int *)regs, level);
     136                 :   return !!(unsigned(regs[reg]) & bit);
     137                 : }
     138                 : 
     139                 : #endif // end CPUID declarations
     140                 : 
     141                 : }
     142                 : 
     143                 : namespace mozilla {
     144                 : 
     145                 : namespace sse_private {
     146                 : 
     147                 : #if defined(MOZILLA_SSE_HAVE_CPUID_DETECTION)
     148                 : 
     149                 : #if !defined(MOZILLA_PRESUME_MMX)
     150               1 :   bool mmx_enabled = has_cpuid_bit(1u, edx, (1u<<23));
     151                 : #endif
     152                 : 
     153                 : #if !defined(MOZILLA_PRESUME_SSE)
     154               1 :   bool sse_enabled = has_cpuid_bit(1u, edx, (1u<<25));
     155                 : #endif
     156                 : 
     157                 : #if !defined(MOZILLA_PRESUME_SSE2)
     158               1 :   bool sse2_enabled = has_cpuid_bit(1u, edx, (1u<<26));
     159                 : #endif
     160                 : 
     161                 : #if !defined(MOZILLA_PRESUME_SSE3)
     162               1 :   bool sse3_enabled = has_cpuid_bit(1u, ecx, (1u<<0));
     163                 : #endif
     164                 : 
     165                 : #if !defined(MOZILLA_PRESUME_SSSE3)
     166               1 :   bool ssse3_enabled = has_cpuid_bit(1u, ecx, (1u<<9));
     167                 : #endif
     168                 : 
     169                 : #if !defined(MOZILLA_PRESUME_SSE4A)
     170               1 :   bool sse4a_enabled = has_cpuid_bit(0x80000001u, ecx, (1u<<6));
     171                 : #endif
     172                 : 
     173                 : #if !defined(MOZILLA_PRESUME_SSE4_1)
     174               1 :   bool sse4_1_enabled = has_cpuid_bit(1u, ecx, (1u<<19));
     175                 : #endif
     176                 : 
     177                 : #if !defined(MOZILLA_PRESUME_SSE4_2)
     178               1 :   bool sse4_2_enabled = has_cpuid_bit(1u, ecx, (1u<<20));
     179                 : #endif
     180                 : 
     181                 : #endif
     182                 : 
     183                 : } // namespace sse_private
     184               3 : } // namespace mozilla

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