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

[Gregory Golberg]

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On Sat, Feb 6, 2016, 6:06 AM <mechanica...@googlegroups.com> wrote:

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• Static branch prediction (was: On intel x86 processors do you have branch predictions on fixed loops ?) - 1 Update

Static branch prediction (was: On intel x86 processors do you have branch predictions on fixed loops ?)

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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