[llvm] [AArch64] Improve non-SVE popcount for 32bit and 64 bit using udot (PR #95881)

[Alexis Engelke via llvm-commits]

aengelke wrote:

Any chance we could get the pattern also for GlobalISel? (Not blocking etc., but if we keep adding patterns to SDAG and not GlobalISel, we'll probably never switch the default...)

https://github.com/llvm/llvm-project/pull/95881