> So if you're wondering why it's slower, it's almost certainly that the hand-written assembly is actually poorly scheduled. The assembly is slower because Go

> So if you're wondering why it's slower, it's almost certainly that the hand-written assembly is actually poorly scheduled. The assembly is slower because Go doesn't inline it. The overhead is obvious when calling one-op assembly blocks[1]. The proposal to inline assembly was rejected last year[2] by Russ Cox. [1] https://lemire.me/blog/2016/12/21/performance-overhead-when-calling-assembly-from-go/ https://lemire.me/blog/2016/12/21/performance-overhead-when-... [2] https://github.com/golang/go/issues/17373 https://github.com/golang/go/issues/17373