[llvm] [BPF] Use mul for certain div/mod operations (PR #110712)

[via llvm-commits]

yonghong-song wrote:

For
> you mean to lower sdiv into udiv plus conditionals ?

This is my original proposal. But after discussing with @4ast, looks like using mul etc. has better performance and that is why we did this by utilizing LLVM existing features. If interested, udiv+conditional approach can be experimented later.

https://github.com/llvm/llvm-project/pull/110712