Currently 4/6 of the "AMD CPU Libraries" (https://developer.amd.com/amd-cpu-libraries) are open-source. The outliers are AMD RNG Library (the related Secure RNG Library does have source distributed) and AMD Math Library.
Given AMD's well-known support of the open-source community and their history of open-sourcing similar math-related libraries, It would be great if the AMD Math Library (LibM) could be moved into the category of "open-source" as well.
It is also generally the case that, while there are several open source LibM implementations floating around, none of them have been optimized as well as the libraries provided by AMD or Intel (or the internal CRT implementation for MacOS or Windows). All of these highly optimized/performant implementations are currently closed-source.