CUDA计算函数集合

unsigned NumberOfBitsNeeded ( unsigned PowerOfTwo ) //===========计算需要运算的点数是 2的几次方，返回指数============={unsigned i;//左移不关心符号，所以这里定义无符号数if ( PowerOfTwo < 2 )//数据必须比2大，否则无意义。{fprintf (stderr,">>> Error in fftmisc.c: argument %d to NumberOfBitsNeeded is too small./n",PowerOfTwo );exit(1);}for ( i=0; ; i++ ){if ( PowerOfTwo & (1 << i) )//二次方运算，直到得到本身为止return i;//找到开方数，返回}}