[llvm] [AArch64] Improve code generation for experimental.cttz.elts (PR #91505)

[Hari Limaye via llvm-commits]

hazzlim wrote:

> Oh @fhahn I see what you mean! :face_palm Yes, you're right - I bet they are now broken with this patch. @hazzlim can you try the cost model tests in test/Analysis/CostModel/AArch64 and see if they need updating?

Cost model tests updated!

https://github.com/llvm/llvm-project/pull/91505