necessitate to modify mpegvideo.c. The problem comes from the
fact they decided to store the quantized DC (which would lead
to problems if Q could vary !) */
+#ifdef ARCH_X86
+ /* using 16bit divisions as they are large enough and 2x as fast */
+ asm volatile(
+ "movl %3, %%eax \n\t"
+ "shrl $1, %%eax \n\t"
+ "addl %%eax, %2 \n\t"
+ "addl %%eax, %1 \n\t"
+ "addl %0, %%eax \n\t"
+ "xorl %%edx, %%edx \n\t"
+ "divw %w3 \n\t"
+ "movzwl %%ax, %0 \n\t"
+ "movl %1, %%eax \n\t"
+ "xorl %%edx, %%edx \n\t"
+ "divw %w3 \n\t"
+ "movzwl %%ax, %1 \n\t"
+ "movl %2, %%eax \n\t"
+ "xorl %%edx, %%edx \n\t"
+ "divw %w3 \n\t"
+ "movzwl %%ax, %2 \n\t"
+ : "+r" (a), "+r" (b), "+r" (c)
+ : "r" (scale)
+ : "%eax", "%edx"
+ );
+#else
a = (a + (scale >> 1)) / scale;
b = (b + (scale >> 1)) / scale;
c = (c + (scale >> 1)) / scale;
-
+#endif
/* XXX: WARNING: they did not choose the same test as MPEG4. This
is very important ! */
if (abs(a - b) <= abs(b - c)) {