Added more comments and committed, thanks!

On Mon, Jan 23, 2023 at 3:36 AM Jeff Law <jeffreyalaw@gmail.com> wrote:

>
>
> On 1/17/23 20:03, juzhe.zhong@rivai.ai wrote:
> > From: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>
> >
> > gcc/ChangeLog:
> >
> >          * config/riscv/riscv-passes.def (INSERT_PASS_BEFORE): Reorder
> VSETVL PASS.
> It'd be useful to know the motivation here, I could easily see someone
> in the future finding a case where the location of the vsetvl gets
> influenced by some dead code that would have been removed by the DCE
> pass.  Then they're going to want to know the motivation behind the
> current pass placement.
>
> So, OK after adding a comment describing why the pass is placed where it
> is.
>
> Jeff
>