Merge commit 'e6bff23f1e11aefb16a2b5d6ee72bf7469c5a66e'
[ffmpeg.git] / libavutil / cpu.c
index a22da0fa8c0df6b47155fe919ab6e26abc7bd473..ab04494acf5e026b06c6647e73666afaba00eb37 100644 (file)
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <stddef.h>
 #include <stdint.h>
 #include <stdatomic.h>
 
+#include "attributes.h"
 #include "cpu.h"
 #include "cpu_internal.h"
 #include "config.h"
@@ -299,3 +301,40 @@ int av_cpu_count(void)
 
     return nb_cpus;
 }
+
+size_t av_cpu_max_align(void)
+{
+    int av_unused flags = av_get_cpu_flags();
+
+#if ARCH_ARM || ARCH_AARCH64
+    if (flags & AV_CPU_FLAG_NEON)
+        return 16;
+#elif ARCH_PPC
+    if (flags & (AV_CPU_FLAG_ALTIVEC   |
+                 AV_CPU_FLAG_VSX       |
+                 AV_CPU_FLAG_POWER8))
+        return 16;
+#elif ARCH_X86
+    if (flags & (AV_CPU_FLAG_AVX2      |
+                 AV_CPU_FLAG_AVX       |
+                 AV_CPU_FLAG_XOP       |
+                 AV_CPU_FLAG_FMA4      |
+                 AV_CPU_FLAG_FMA3      |
+                 AV_CPU_FLAG_AVXSLOW))
+        return 32;
+    if (flags & (AV_CPU_FLAG_AESNI     |
+                 AV_CPU_FLAG_SSE42     |
+                 AV_CPU_FLAG_SSE4      |
+                 AV_CPU_FLAG_SSSE3     |
+                 AV_CPU_FLAG_SSE3      |
+                 AV_CPU_FLAG_SSE2      |
+                 AV_CPU_FLAG_SSE       |
+                 AV_CPU_FLAG_ATOM      |
+                 AV_CPU_FLAG_SSSE3SLOW |
+                 AV_CPU_FLAG_SSE3SLOW  |
+                 AV_CPU_FLAG_SSE2SLOW))
+        return 16;
+#endif
+
+    return 8;
+}