在 SIMD 操作的上下文中，非打包指令和打包指令有什么区别? [英] What is the difference between non-packed and packed instruction in the context of SIMD-operations?

问题描述

在 SIMD 操作的上下文中，非压缩指令和压缩指令有什么区别?

What is the difference between non-packed and packed instruction in the context of SIMD-operations?

我正在阅读一篇关于优化 SSE 代码的文章:

I was reading an article on optimizing your code for SSE:

http://www.cortstratton.org/articles/OptimizingForSSE.php#batch

当我阅读时出现了这个问题

and this question arose when I read

作为一个额外的好处，movss 是一个非打包指令，它使我们能够更好地利用并行指令解码器.."

"As an added bonus, movss is a non-packed instruction, which allows us to make better use of the parallel instruction decoders.."

那有什么区别?

推荐答案

据我所知，packed 意味着概念上不止一个值被传输或用作操作数，而 non-打包表示只处理一个值；非打包意味着不进行并行处理.

To my understanding, packed means that conceptually more than one value is transferred or used as an operand, whereas non-packed means that only one value is is processed; non-packed means that no parallel processing takes place.

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