[PATCH] D116277: [RISCV] Use vmv.x.s to build one element splat vector.

[Jianjian Guan via Phabricator via llvm-commits]

jacquesguan added a comment.

In D116277#3210767 <https://reviews.llvm.org/D116277#3210767>, @craig.topper wrote:

> Do you have a particular microarchitecture where this is a faster sequence?
>
> Why only integer and not FP?

I think that vmv.s.x has less demand on VL and VTYPE, so using vmv.s.x instead vmv.v.x might reduce the amount of VSETVLI instructions that we will insert.

I missed the floating point scalar move instruction, if you think it make sense, I will add it.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D116277/new/

https://reviews.llvm.org/D116277