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Re: [PATCH 1/3] target/riscv: Remove the redundant initialization of env
From: |
Alistair Francis |
Subject: |
Re: [PATCH 1/3] target/riscv: Remove the redundant initialization of env->misa_mxl |
Date: |
Thu, 16 Jun 2022 12:33:51 +1000 |
On Mon, Jun 13, 2022 at 10:30 PM Bin Meng <bmeng.cn@gmail.com> wrote:
>
> On Mon, Jun 13, 2022 at 8:33 AM Alistair Francis <alistair23@gmail.com> wrote:
> >
> > On Thu, Jun 9, 2022 at 11:08 AM Bin Meng <bmeng.cn@gmail.com> wrote:
> > >
> > > env->misa_mxl was already set in the RISC-V cpu init routine, and
> > > validated at the beginning of riscv_cpu_realize(). There is no need
> > > to do a redundant initialization later.
> > >
> > > Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
> > > ---
> > >
> > > target/riscv/cpu.c | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> > > index a91253d4bd..61d1737741 100644
> > > --- a/target/riscv/cpu.c
> > > +++ b/target/riscv/cpu.c
> > > @@ -752,7 +752,7 @@ static void riscv_cpu_realize(DeviceState *dev, Error
> > > **errp)
> > > ext |= RVJ;
> > > }
> > >
> > > - set_misa(env, env->misa_mxl, ext);
> > > + env->misa_ext_mask = env->misa_ext = ext;
> >
> > You're right that we don't need to set `misa_mxl`, but isn't it
> > cleaner calling the helper function here instead of manually assigning
> > it?
> >
>
> There is no helper for assigning misa_ext only. Do you want a new
> helper for that?
No, I don't think we need a new helper. I mean, is there any harm in
just calling `set_misa()` even if that means we are performing a
redundant operation?
Alistair
>
> Regards,
> Bin