[llvm] [RISCV] Mark vmvNr.v as implicitly using vtype (PR #118414)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

> > > I had to update the llvm-mca tests, I'm not sure why adding a use affects the number of cycles. cc @mshockwave
> > 
> > 
> > LGTM as well, the mca change is at least reasonable if we're modeling a new runtime dependency which wasn't previously being modeled.
> 
> Looking at the test. There are vsetvlis interleaved with vmv. So I assume llvm-mca is now waiting for the preceding vsetvli before it can start a vmv.

Correct, this is the timeline before:
```
Index     0123456789          0123456789          0123456789          0123456789

[0,0]     DeER .    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, mf8, tu, mu
[0,1]     DeeER.    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,2]     D=eER.    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, mf4, tu, mu
[0,3]     .DeeER    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,4]     .D=eER    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, mf2, tu, mu
[0,5]     .D=eeER   .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,6]     . D=eER   .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, m1, tu, mu
[0,7]     . D=eeER  .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,8]     . D==eER  .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, m1, tu, mu
[0,9]     .  D=eeER .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,10]    .  D==eER .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, m2, tu, mu
[0,11]    .  D==eeER.    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
```
And this is the one after:
```
Index     0123456789          0123456789          0123456789          0123456789

[0,0]     DeER .    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, mf8, tu, mu
[0,1]     D=eeER    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,2]     D=eE-R    .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, mf4, tu, mu
[0,3]     .D=eeER   .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,4]     .D=eE-R   .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, mf2, tu, mu
[0,5]     .D==eeER  .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,6]     . D=eE-R  .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, m1, tu, mu
[0,7]     . D==eeER .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,8]     . D==eE-R .    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, m1, tu, mu
[0,9]     .  D==eeER.    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
[0,10]    .  D==eE-R.    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vsetvli    zero, zero, e8, m2, tu, mu
[0,11]    .  D===eeER    .    .    .    .    .    .    .    .    .    .    .    .    .   .   vmv1r.v    v8, v16
```
vmvNr no longer can be issued at the same cycle with vsetvli.

https://github.com/llvm/llvm-project/pull/118414