英特尔关于跳过缓存的内存访问说明 [英] Intel instructions for access to memory which skips cache

问题描述

是否存在一条指令，我可以使用该指令在内存中将变量移入/移出寄存器，而无需将其存储在高速缓存中?我不想使用CD位完全禁用缓存，我只想对单个内存进行访问.

Is there an instruction using which I can move a variable to/from memory and registers without it being stored in cache? I don't want to disable caching entirely by using CD bit, I only want to do this for individual memory accesses.

推荐答案

movnt存储旁路缓存，但

movnt stores bypass cache, but movntdqa loads may not do that for normal (write-back) memory regions.

指令集参考手册非常清楚，它与WB存储器上的movdqa可能没有什么不同，但是IDK可以在当前的任何微体系结构上实际发生.

The instruction-set reference manual is very clear that it might not be any different from movdqa on WB memory, but IDK what actually happens on any current microarchitectures.

movntdqa旨在加快诸如从WC视频RAM中读取内容的速度，例如将硬件视频解码器的结果复制回主存储器.

movntdqa is intended to speed up stuff like reading from WC video RAM, e.g. copying the results of a hardware video decoder back to main memory.

这篇关于英特尔关于跳过缓存的内存访问说明的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！