优化技术简介—降低运算强度 a)i大2=2大=立+i <<2 b)i/2=(int)(i*0.5) c)0-1=-1 d)f*2=2.0大f=f+f e)f/2.0=f+0.5优化技术简介—降低运算强度 a) i*2 = 2*i = i+i = i<<2 b) i/2 = (int)(i*0.5) c) 0-1 = -1 d) f*2 = 2.0 * f = f + f e) f/2.0 = f*0.5