+ unsigned int b;
+
+ if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
+ else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
+#ifndef CONFIG_SMALL
+ else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
+ else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ] ;
+#endif
+ else{
+ int s= av_log2_16bit(a>>16)>>1;
+ unsigned int c= a>>(s+2);
+ b= ff_sqrt_tab[c>>(s+8)];
+ b= FASTDIV(c,b) + (b<<s);