C语言程序员都是乐于思考的,为什么逐项赋值没有memcpy() 快?

在C语言程序开发中,每每需要将 N 个字节从源内存段 pSrc 拷贝到目标内存段 pDest。稍稍有些履历的程序员普通都会调用C语言标准库函数 memcpy() 或者 memmove(),究竟上,大多数程序员都会调用这两个库函数实现需要。

为何逐项赋值没有memcpy() 快?

为何逐项赋值没有memcpy() 快?

C语言程序员都是乐于思索的,在调用 memcpy() 函数实现内存拷贝时,往往会思索 memcpy() 函数的实现方法。在一些程序员看来,memcpy() 无非即是下面如许的逐项拷贝:

int i;for(i=0; i<N; i++)

*pDest++ = *pSrc++;

考虑到 memcpy() 函数可以接受随便范例的源内存段指针和目标内存段指针,用C语言来形貌即是 memcpy() 函数汲取的源内存段指针和目标内存段指针都是 void * 指针,是以可能还要多一步指针范例转换:

可能还要多一步指针范例转换

这里转换为 unsigned char* 指针只仅作为示例,读者固然可以将其转换为其余范例指针。

乐于动手的C语言程序员一定本人测试实现过本人的 memcpy() 函数,要是读者测试过本人的实现,在性能测试中一定能够发现,上述实现的服从并无 memcpy() 库函数的服从高,这是为何呢?

memcpy() 函数应用的本领

既然逐字节赋值拷贝的 my_memcpy() 服从比不上 memcpy() 函数,辣么 memcpy() 函数一定应用了某些本领,毕竟甚么本领呢?

前文说明的 my_memcpy() 实现是将汲取到的指针转换成 char * 指针,逐字节拷贝的。但是 memcpy() 函数普通不应用字节指针,而是应用字指针。

看过我以前文章的读者应该清晰,CPU 在处分数据时,要是数据严格根据数据总线宽度对齐,辣么CPU才气非常大服从处分数据。

究竟上,memcpy() 函数的实现平时应用 SIMD 指令编写,这使得它能够一次操纵 128 位数据。对于 SIMD 指令,以后有时机再谈论。当今读者只需晓得,memcpy() 函数一次可以拷贝 16 字节的数据就可以了,这比一次只拷贝 1 字节的数据服从高多了。

改进 my_memcpy() 函数,晋升服从的偏向

C语言程序员在现实拷贝数据时,要拷贝的数据长度不一定是 16 字节的整数倍,所以 memcpy() 的实现要比 my_memcpy() 的实现复杂得多。

memcpy() 的实现要比 my_memcpy() 的实

my_memcpy() 的第一个改进是在内存时根据本机字宽度( 32位机械普通是4字节,64位机械普通是8字节)对齐要拷贝的数据,而且应用字指针而不是字节指针拷贝数据,关联的C语言代码如下:

应用字指针而不是字节指针拷贝数据

源内存段指针或者目标内存段指针是否精确对齐,在不同架构的机械大将执行不同的操纵。比方,在 XScale 处分器上,通过对齐目标内存段指针,在现实性能测试中,我获得了更高的内存拷贝服从。

若想进一步晋升内存拷贝的服从,可以将一些C语言代码中的轮回睁开,便于进步 CPU 缓存的掷中率。但是这种方法带来的服从晋升会因系统架构的不同而不同,由于 CPU 加载和存储数据的方法不妨不同的。

另有一种晋升服从的方法,即手动编写 CPU 加载和存储指令,以掌握数据吞吐量。但是这种方法需要借助汇编指令实现,C语言暂时还没有才气实现如许的精细操纵。

小结

轻易看出,在C语言程序开发中,简单的内存拷贝也并不简单,我们有着相配多的优化空间。C语言程序的魂魄之一即是高服从,而C语言本身提供的都是非常底子的操纵,是以它是一种相配正视设计的程序语言,作为C语言程序员,我们在设计某个方法时,应该老是想清楚若何才气写出更高效的程序。

欢迎在批评区一路谈论,怀疑。文章都是手打原创,每天非常浅显的说明C语言、linux等嵌入式开发,稀饭我的文章就关注一波吧,可以看到非常新更新和以前的文章哦。

 

 

 

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