libavutil/cpu.c
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 /*
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "cpu.h"
 #include "config.h"
 
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 static int flags, checked;
 
 void av_force_cpu_flags(int arg){
     flags   = arg;
     checked = 1;
 }
 
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 int av_get_cpu_flags(void)
 {
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     if (checked)
         return flags;
 
     if (ARCH_ARM) flags = ff_get_cpu_flags_arm();
     if (ARCH_PPC) flags = ff_get_cpu_flags_ppc();
     if (ARCH_X86) flags = ff_get_cpu_flags_x86();
 
     checked = 1;
     return flags;
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 }
 
 #ifdef TEST
 
 #undef printf
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 #include <stdio.h>
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 int main(void)
 {
     int cpu_flags = av_get_cpu_flags();
 
     printf("cpu_flags = 0x%08X\n", cpu_flags);
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     printf("cpu_flags = %s%s%s%s%s%s%s%s%s%s%s%s%s\n",
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 #if   ARCH_ARM
            cpu_flags & AV_CPU_FLAG_IWMMXT   ? "IWMMXT "     : "",
 #elif ARCH_PPC
            cpu_flags & AV_CPU_FLAG_ALTIVEC  ? "ALTIVEC "    : "",
 #elif ARCH_X86
            cpu_flags & AV_CPU_FLAG_MMX      ? "MMX "        : "",
            cpu_flags & AV_CPU_FLAG_MMX2     ? "MMX2 "       : "",
            cpu_flags & AV_CPU_FLAG_SSE      ? "SSE "        : "",
            cpu_flags & AV_CPU_FLAG_SSE2     ? "SSE2 "       : "",
            cpu_flags & AV_CPU_FLAG_SSE2SLOW ? "SSE2(slow) " : "",
            cpu_flags & AV_CPU_FLAG_SSE3     ? "SSE3 "       : "",
            cpu_flags & AV_CPU_FLAG_SSE3SLOW ? "SSE3(slow) " : "",
            cpu_flags & AV_CPU_FLAG_SSSE3    ? "SSSE3 "      : "",
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            cpu_flags & AV_CPU_FLAG_ATOM     ? "Atom "       : "",
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            cpu_flags & AV_CPU_FLAG_SSE4     ? "SSE4.1 "     : "",
            cpu_flags & AV_CPU_FLAG_SSE42    ? "SSE4.2 "     : "",
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            cpu_flags & AV_CPU_FLAG_AVX      ? "AVX "        : "",
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            cpu_flags & AV_CPU_FLAG_3DNOW    ? "3DNow "      : "",
            cpu_flags & AV_CPU_FLAG_3DNOWEXT ? "3DNowExt "   : "");
 #endif
     return 0;
 }
 
 #endif