[llvm] [VP][RISCV] Add vp.cttz.elts intrinsic and its RISC-V codegen (PR #90502)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

> > This intrinsic is basically ...
> 
> Is there anything that makes it `basically` the vp version and not just the vp version?

yeah you're right, I'd removed the word "basically".

https://github.com/llvm/llvm-project/pull/90502