[llvm] [APInt] Introduce carry-less multiply operation (PR #168527)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> https://isocpp.org/files/papers/P3642R3.html#possible-implementation There's a more recent version of the proposal by the way. The naive implementation there is a bit better than the one in R2.

I get a 500 error on that page: can you kindly post the text if you have access?

https://github.com/llvm/llvm-project/pull/168527