Re: [PATCH] x86: Align jump targets to 1 byte boundaries

H. Peter Anvin
2015-04-10T18:33:32Z

On 04/10/2015 10:54 AM, Ingo Molnar wrote:
>
> Yeah, but the decoder stops if the prefetch crosses a cache line? So
> it appears to be an interaction of the 16 byte prefetch window and
> cache line boundaries?
>

I don't think it has anything to do with cache lines. Rather, you may
lose a cycle if the first instruction bundle crosses into a new 16-byte
chunk.

-hpa