ARM: optimised mid_pred()

Originally committed as revision 16819 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/arm/mathops.h

@@ -90,4 +90,22 @@ static inline av_const MUL16(int ra, int rb)
 
 #endif
 
+#define mid_pred mid_pred
+static inline av_const int mid_pred(int a, int b, int c)
+{
+    int m;
+    __asm__ volatile (
+        "mov   %0, %2  \n\t"
+        "cmp   %1, %2  \n\t"
+        "movgt %0, %1  \n\t"
+        "movgt %1, %2  \n\t"
+        "cmp   %1, %3  \n\t"
+        "movle %1, %3  \n\t"
+        "cmp   %0, %1  \n\t"
+        "movgt %0, %1  \n\t"
+        : "=&r"(m), "+r"(a)
+        : "r"(b), "r"(c));
+    return m;
+}
+
 #endif /* AVCODEC_ARM_MATHOPS_H */