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关于指令集位数,指令构架位数简述
2022-06-13 09:25:00 【edui】
简言之就是处理器架构的位数越高,速度越快,内存越多
处理器架构的位数是指通用寄存器的宽度,其决定了寻址范围的大小、运算能力的强弱。譬如32位架构的处理器,其通用寄存器的宽度是32位,能够寻址的范围是2的32次方,即4GB的寻址空间,运算指令可以操作的操作数是32位,也就是说一个机器周期内可以处理32个01,。
指令集就是可以通过它区控制CPU的东西,比如叫CPU做加法运算啥的发出一个指令(命令)就可以,这个指令集时随这CPU一起出生的硬软件,对于CPU只能使用它给定的指令区调用CPU能力,没有别的办法。在有限的指令构成庞大的代码,指令也是要全面才得。
指令的保存位数和构架位数没有关系,指令集的保存位数越短越好,这样可以节约代码保存的空间,也就是说在满足条件情况下,尽量的用越低位数越好,不然写代码时没写一个指令都要多个字节保存
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