Re: [PATCH qemu v2 10/10] target/riscv: rvv: Add option 'rvv_ma_all_1s' to enable optional mask agnostic behavior

[Weiwei Li]

在 2022/5/11 上午2:10, ~eopxd 写道:
> From: eopXD <eop.chen@sifive.com>
>
> According to v-spec, mask agnostic behavior can be either kept as
> undisturbed or set elements' bits to all 1s. To distinguish the
> difference of mask policies, QEMU should be able to simulate the mask
> agnostic behavior as "set mask elements' bits to all 1s".
>
> There are multiple possibility for agnostic elements according to
> v-spec. The main intent of this patch-set tries to add option that
> can distinguish between mask policies. Setting agnostic elements to
> all 1s allows QEMU to express this.
>
> This commit adds option 'rvv_ma_all_1s' is added to enable the
> behavior, it is default as disabled.
>
> Signed-off-by: eop Chen <eop.chen@sifive.com>
> Reviewed-by: Frank Chang <frank.chang@sifive.com>
> ---
>   target/riscv/cpu.c | 1 +
>   1 file changed, 1 insertion(+)


Reviewed-by: Weiwei Li<liweiwei@iscas.ac.cn>

Regards,
Weiwei Li
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index 720c8b9e5c..0245844b99 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -880,6 +880,7 @@ static Property riscv_cpu_properties[] = {
>   
>       DEFINE_PROP_UINT64("resetvec", RISCVCPU, cfg.resetvec, DEFAULT_RSTVEC),
>       DEFINE_PROP_BOOL("rvv_ta_all_1s", RISCVCPU, cfg.rvv_ta_all_1s, false),
> +    DEFINE_PROP_BOOL("rvv_ma_all_1s", RISCVCPU, cfg.rvv_ma_all_1s, false),
>       DEFINE_PROP_END_OF_LIST(),
>   };
>