GNU C library 2.33 released

Posted Feb 4, 2021 20:53 UTC (Thu) by joib (subscriber, #8541)
In reply to: GNU C library 2.33 released by dvdeug
Parent article: GNU C library 2.33 released

> Basically AMD64 is a mismash of supported features, across all chips and even within just Intel chips.

AFAIU the glibc-hwcaps and the microarchitecture levels are meant to provide somewhat decent baselines that apply to many CPU's out there and are expected to be "standard" features in x86 CPU's going forwards. It's up to the psABI developers to not be too aggressive in adding stuff there that might disappear from the market or are of interest only to a small subset of the market (both of these applying to the Xeon Phi's you mentioned).

> I've got "System V Application Binary Interface: AMD64 Architecture Processor Supplement (With LP64 and ILP32 Programming Models) Version 1.0", but I don't see any details about the microarchitecture levels; if that's the right document, the newer versions only come as TeX files.

For some reason the PDF's are excruciatingly hard to find. If you click on the "Wiki" section you get a placeholder page saying that the project has no wiki pages. However, the PDF's are there, the URL is

https://gitlab.com/x86-psABIs/x86-64-ABI/-/wikis/x86-64-p...

(The microarchitecture levels are in Table 3.1)