Re: Digest for mechanical-sympathy@googlegroups.com - 1 update in 1 topic

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Gregory Golberg

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Jul 25, 2021, 9:04:46 PM7/25/21
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On Sat, Feb 6, 2016, 6:06 AM <mechanica...@googlegroups.com> wrote:
Matt Godbolt <ma...@godbolt.org>: Feb 05 02:58PM

Hi Matt,
 
A quick reply: thanks again for the link! My reading list is significantly
backed up now :)
 
For now I'm going to concentrate on honing my technique and scripts on the
Arrendale - mainly as it's a computer I have available even when I'm
commuting (which is where I get most of the time for this!). Once I'm
comfortable explaining branch prediction there, I'll move on to the Sandy,
Ivy and Haswell: each of which has significant BP improvements.
 
I'm also first starting on interpreting the BTB size - under the assumption
that there's no taken/not-taken information stored there; and that a miss
in the BTB always causes one of the "BP failure" counters to tick up. At
least on Arrendale/Westmere, there's a bunch of counters for this; early
ones where the decoder spots a branch the BTB failed to notice, for
example. I have a ton of notes and thoughts; I'll probably write up
something over the next few days and post it here (or a link to a blog post
or similar).
 
Thanks, Matt (G) :)
 
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