[llvm-branch-commits] [llvm] [RISCV] Add initial support of memcmp expansion (PR #107548)

[Pengcheng Wang via llvm-branch-commits]

wangpc-pp wrote:

> > The run just finished, I'm seeing a 0.75% improvement on 500.perlbench_r on the BPI F3 (-O3 -mcpu=spacemit-x60), no regressions or improvements on the other benchmarks as far as I can see. Seems to check out with the number of memcmps inlined reported for perlbench!
> 
> Does spacemit-x60 support unaligned scalar memory and was your test with or without that enabled?

It supports unaligned scalar but not unaligned vector. And it seems we don't add these features to `-mcpu=spacemit-x60`. So I think @lukel97 ran the SPEC without unaligned scalar.

https://github.com/llvm/llvm-project/pull/107548