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Re: [RFC v2 50/76] target/riscv: rvv-0.9: single-width saturating add an


From: Richard Henderson
Subject: Re: [RFC v2 50/76] target/riscv: rvv-0.9: single-width saturating add and subtract instructions
Date: Thu, 30 Jul 2020 14:24:45 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 7/22/20 2:16 AM, frank.chang@sifive.com wrote:
> From: Frank Chang <frank.chang@sifive.com>
> 
> Sign-extend vsaddu.vi immediate value.
> 
> Signed-off-by: Frank Chang <frank.chang@sifive.com>
> ---
>  target/riscv/insn_trans/trans_rvv.inc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/target/riscv/insn_trans/trans_rvv.inc.c 
> b/target/riscv/insn_trans/trans_rvv.inc.c
> index 956ee90745..3018489536 100644
> --- a/target/riscv/insn_trans/trans_rvv.inc.c
> +++ b/target/riscv/insn_trans/trans_rvv.inc.c
> @@ -2374,7 +2374,7 @@ GEN_OPIVX_TRANS(vsaddu_vx,  opivx_check)
>  GEN_OPIVX_TRANS(vsadd_vx,  opivx_check)
>  GEN_OPIVX_TRANS(vssubu_vx,  opivx_check)
>  GEN_OPIVX_TRANS(vssub_vx,  opivx_check)
> -GEN_OPIVI_TRANS(vsaddu_vi, IMM_ZX, vsaddu_vx, opivx_check)
> +GEN_OPIVI_TRANS(vsaddu_vi, IMM_SX, vsaddu_vx, opivx_check)
>  GEN_OPIVI_TRANS(vsadd_vi, IMM_SX, vsadd_vx, opivx_check)
>  
>  /* Vector Single-Width Averaging Add and Subtract */
> 

This isn't what spike does.

The manual could really stand to be more specific here...


r~



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