[llvm] [SDag][ARM][RISCV] Allow lowering CTPOP into a libcall (PR #101786)

[Nikita Popov via llvm-commits]

nikic wrote:

> Should we expand the ctpop+icmp idiom during CodeGenPrepare?

I think that would make sense.

https://github.com/llvm/llvm-project/pull/101786