20% faster huffyuv decoding, 4% faster ffv1.
Originally committed as revision 6254 to svn://svn.ffmpeg.org/ffmpeg/trunk
/* median of 3 */
static inline int mid_pred(int a, int b, int c)
{
-#if 0
+#if (defined(ARCH_X86) && __CPU__ >= 686 || defined(ARCH_X86_64)) && !defined(RUNTIME_CPUDETECT)
+ int i=a, j=a;
+ asm volatile(
+ "cmp %4, %2 \n\t"
+ "cmovg %4, %0 \n\t"
+ "cmovl %4, %1 \n\t"
+ "cmp %4, %3 \n\t"
+ "cmovg %3, %0 \n\t"
+ "cmovl %3, %1 \n\t"
+ "cmp %3, %2 \n\t"
+ "cmovl %1, %0 \n\t"
+ :"+&r"(i), "+&r"(j)
+ :"r"(a), "r"(b), "r"(c)
+ );
+ return i;
+#elif 0
int t= (a-b)&((a-b)>>31);
a-=t;
b+=t;