Hi, Ruoyao, On Thu, Sep 30, 2021 at 11:30 PM Xi Ruoyao <xry111@xxxxxxxxxxxxxxxx> wrote: > > On Mon, 2021-09-27 at 14:42 +0800, Huacai Chen wrote: > > > +#define t0 $r12 /* caller saved */ > > +#define t1 $r13 > > +#define t2 $r14 > > +#define t3 $r15 > > +#define t4 $r16 > > +#define t5 $r17 > > +#define t6 $r18 > > +#define t7 $r19 > > +#define t8 $r20 > > +#define x0 $r21 > > In the doc it's said x0 will be used to name a 256-bit vector register. > Maybe it's better to rename this one? OK, I want to rename it to u0 (U means Unused in userspace). Huacai >