Hi,
I find there exists some restricts in function fwprop preventing it to
forward propagate addresses into loops.
/* Go through all the uses. df_uses_create will create new ones at the
end, and we'll go through them as well.
Do not forward propagate addresses into loops until after unro
> -Original Message-
> From: Richard Biener [mailto:richard.guent...@gmail.com]
> Sent: Monday, March 30, 2020 4:39 PM
> To: xiezhiheng
> Cc: gcc@gcc.gnu.org
> Subject: Re: [QUESTION] About RTL optimization at forward propagation
>
> On Sat, Mar 28, 2020 at 4:1
