[eigen] Matrix support in Clang

[Florian Hahn <florian_hahn@xxxxxxxxx>]

Hello,

As already mentioned earlier on the list, we recently shared a proposal to add support for some matrix math operations to Clang.

The extension initially helps to improve & simplify code generation for small matrixes (sizes < 15x15). We are currently trying to make sure the extension is useful for a wider range of users. It would be great if you could take a look and share any feedback or comments on cfe-dev.

The original proposal can be found on the cfe-dev mailing list: http://lists.llvm.org/pipermail/cfe-dev/2019-December/064141.html and the thread continues in January: http://lists.llvm.org/pipermail/cfe-dev/2020-January/064206.html

The original proposal uses builtins for matrix operations, but as part of the initial feedback we are planning on replacing those with proper operators for the type.

Thanks,

Florian