ARM: allow runtime masking of CPU features

[ffmpeg] / libavutil / cpu.c

diff --git a/libavutil/cpu.c b/libavutil/cpu.c
index 1548530b87d3e5a05b91d2d1a0fa44e7f9f977ad..e23d40180fbc8fa4bf6ea3b104b529fbaa0fa658 100644 (file)
--- a/libavutil/cpu.c
+++ b/libavutil/cpu.c
@@ -1,27 +1,29 @@
 /*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; 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"
 
+static int cpuflags_mask = -1, checked;
+
 int av_get_cpu_flags(void)
 {
-    static int flags, checked;
+    static int flags;
 
     if (checked)
         return flags;
@@ -30,38 +32,69 @@ int av_get_cpu_flags(void)
     if (ARCH_PPC) flags = ff_get_cpu_flags_ppc();
     if (ARCH_X86) flags = ff_get_cpu_flags_x86();
 
+    flags  &= cpuflags_mask;
     checked = 1;
+
     return flags;
 }
 
+void av_set_cpu_flags_mask(int mask)
+{
+    cpuflags_mask = mask;
+    checked       = 0;
+}
+
 #ifdef TEST
 
 #undef printf
+#include <stdio.h>
+
+static const struct {
+    int flag;
+    const char *name;
+} cpu_flag_tab[] = {
+#if   ARCH_ARM
+    { AV_CPU_FLAG_ARMV5TE,   "armv5te"    },
+    { AV_CPU_FLAG_ARMV6,     "armv6"      },
+    { AV_CPU_FLAG_ARMV6T2,   "armv6t2"    },
+    { AV_CPU_FLAG_VFP,       "vfp"        },
+    { AV_CPU_FLAG_VFPV3,     "vfpv3"      },
+    { AV_CPU_FLAG_NEON,      "neon"       },
+#elif ARCH_PPC
+    { AV_CPU_FLAG_ALTIVEC,   "altivec"    },
+#elif ARCH_X86
+    { AV_CPU_FLAG_MMX,       "mmx"        },
+    { AV_CPU_FLAG_MMX2,      "mmx2"       },
+    { AV_CPU_FLAG_SSE,       "sse"        },
+    { AV_CPU_FLAG_SSE2,      "sse2"       },
+    { AV_CPU_FLAG_SSE2SLOW,  "sse2(slow)" },
+    { AV_CPU_FLAG_SSE3,      "sse3"       },
+    { AV_CPU_FLAG_SSE3SLOW,  "sse3(slow)" },
+    { AV_CPU_FLAG_SSSE3,     "ssse3"      },
+    { AV_CPU_FLAG_ATOM,      "atom"       },
+    { AV_CPU_FLAG_SSE4,      "sse4.1"     },
+    { AV_CPU_FLAG_SSE42,     "sse4.2"     },
+    { AV_CPU_FLAG_AVX,       "avx"        },
+    { AV_CPU_FLAG_XOP,       "xop"        },
+    { AV_CPU_FLAG_FMA4,      "fma4"       },
+    { AV_CPU_FLAG_3DNOW,     "3dnow"      },
+    { AV_CPU_FLAG_3DNOWEXT,  "3dnowext"   },
+#endif
+    { 0 }
+};
 
 int main(void)
 {
     int cpu_flags = av_get_cpu_flags();
+    int i;
 
     printf("cpu_flags = 0x%08X\n", cpu_flags);
-    printf("cpu_flags = %s%s%s%s%s%s%s%s%s%s%s%s\n",
-#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 "      : "",
-           cpu_flags & AV_CPU_FLAG_SSE4     ? "SSE4.1 "     : "",
-           cpu_flags & AV_CPU_FLAG_SSE42    ? "SSE4.2 "     : "",
-           cpu_flags & AV_CPU_FLAG_3DNOW    ? "3DNow "      : "",
-           cpu_flags & AV_CPU_FLAG_3DNOWEXT ? "3DNowExt "   : "");
-#endif
+    printf("cpu_flags =");
+    for (i = 0; cpu_flag_tab[i].flag; i++)
+        if (cpu_flags & cpu_flag_tab[i].flag)
+            printf(" %s", cpu_flag_tab[i].name);
+    printf("\n");
+
     return 0;
 }