Update UOP section to mention Zen4 DIV/IDIV and NOP fusion.

dendibakh / perf-book

The book "Performance Analysis and Tuning on Modern CPU"

https://book.easyperf.net/perf_book

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Closed cf-natali closed 3 months ago

cf-natali commented 3 months ago

Since Zen4, besides the usual branch fusion, DIV/IDIV and NOP fusion are also supported. This is relatively new and not widely known, so mention it.

dendibakh commented 3 months ago

Thank you @cf-natali, I didn't know about this. I will add the AMD document to the references, instead of a footnote link. I will update the PR.

dendibakh commented 3 months ago

It looks like this:

dendibakh commented 3 months ago

Ready to merge.

cf-natali commented 3 months ago

LGTM.