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

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

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

I was thinking about this too. There is also PreISelIntrinsicLowering, could it be a better place? Note that it appears [earlier](https://github.com/llvm/llvm-project/blob/fa92d51f9e609270bf14c4bc16eb42a98183d27f/llvm/lib/CodeGen/TargetPassConfig.cpp#L1059) in the pipeline.


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