题目详情

微处理器中的ALU 可执行算术运算和()操作。

  • A.浮点
  • B.定点
  • C.逻辑
  • D.控制

正确答案及解析

正确答案
C
解析

算术逻辑单元(Arithmetic-Logic Unit,ALU)是中央处理器(CPU)的执行单元,是所有中央处理器的核心组成部分,算术逻辑单元主要功能是专门执行算术和逻辑运算的数字运算,如加减乘(不包括整数除法)。绝大部分计算机指令都是由ALU执行的。ALU从寄存器中取出数据,数据经过处理将运算结果存入ALU输出寄存器中。其他部件负责在寄存器与内存间传送数据。控制单元控制着ALU,通过控制电路来告诉ALU该执行什么操作。

大部分ALU都可以完成以下运算:

(1)整数算术运算(加、减,有时还包括乘和除,不过成本较高)。

(2)位逻辑运算(与、或、非、异或)。

(3)移位运算(将一个字向左或向右移位或浮动特定位,而无符号延伸),移位可被认为是乘以2或除以2。

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