On 2021/11/2 上午1:01, Richard Henderson wrote:
On 11/1/21 6:01 AM, LIU Zhiwei wrote:
mask |= MSTATUS_MPV | MSTATUS_GVA;
+ if ((val ^ mstatus) & MSTATUS64_UXL) {
+ mask |= MSTATUS64_UXL;
+ }
Why do you need the conditional here?
Why is this not just
mask |= MSTATUS_MPV | MSTATUS_GVA | MSTATUS64_UXL;
static bool trans_csrrw(DisasContext *ctx, arg_csrrw *a)
{
- TCGv src = get_gpr(ctx, a->rs1, EXT_NONE);
+ TCGv src = get_gpr(ctx, a->rs1, EXT_ZERO);
Hmm. Not sure about this.
It looks like we should in fact change mask, just a few lines down, at
which point the extension (or not) for the source would not matter.
And likewise in trans_csrrwi.
Is there some benefits to use mask?
I see there is still a do_csrw, and we can't give it a mask at
translation time.
Thanks,
Zhiwei
r~
