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List:       qemu-riscv
Subject:    Re: [RFC v4 53/70] target/riscv: rvv-1.0: floating-point slide instructions
From:       Richard Henderson <richard.henderson () linaro ! org>
Date:       2020-08-29 20:33:03
Message-ID: 96b9fa44-5a1b-2ac0-04ae-fa4d2857096e () linaro ! org
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On 8/17/20 1:49 AM, frank.chang@sifive.com wrote:
> +DEF_HELPER_6(vfslide1up_vf_h, void, ptr, ptr, i64, ptr, env, i32)
> +DEF_HELPER_6(vfslide1up_vf_w, void, ptr, ptr, i64, ptr, env, i32)
> +DEF_HELPER_6(vfslide1up_vf_d, void, ptr, ptr, i64, ptr, env, i32)
> +DEF_HELPER_6(vfslide1down_vf_h, void, ptr, ptr, i64, ptr, env, i32)
> +DEF_HELPER_6(vfslide1down_vf_w, void, ptr, ptr, i64, ptr, env, i32)
> +DEF_HELPER_6(vfslide1down_vf_d, void, ptr, ptr, i64, ptr, env, i32)

You shouldn't need any new helpers.

The fp scalar argument can be passed to the existing helpers.

The manual doesn't explicitly say, but I assume the fp scalar needs to be
nan-boxed (for sew > flen), or checked (for sew < flen), just like the scalar
move instructions.


r~


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