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Re: [RFC v4 53/70] target/riscv: rvv-1.0: floating-point slide instructi
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From: |
Richard Henderson |
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Subject: |
Re: [RFC v4 53/70] target/riscv: rvv-1.0: floating-point slide instructions |
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Date: |
Sat, 29 Aug 2020 13:33:03 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
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~
- [RFC v4 48/70] target/riscv: rvv-1.0: integer comparison instructions, (continued)
- [RFC v4 48/70] target/riscv: rvv-1.0: integer comparison instructions, frank . chang, 2020/08/17
- [RFC v4 49/70] target/riscv: use softfloat lib float16 comparison functions, frank . chang, 2020/08/17
- [RFC v4 50/70] target/riscv: rvv-1.0: floating-point compare instructions, frank . chang, 2020/08/17
- [RFC v4 51/70] target/riscv: rvv-1.0: mask-register logical instructions, frank . chang, 2020/08/17
- [RFC v4 52/70] target/riscv: rvv-1.0: slide instructions, frank . chang, 2020/08/17
- [RFC v4 53/70] target/riscv: rvv-1.0: floating-point slide instructions, frank . chang, 2020/08/17
- Re: [RFC v4 53/70] target/riscv: rvv-1.0: floating-point slide instructions,
Richard Henderson <=
- [RFC v4 54/70] target/riscv: rvv-1.0: narrowing fixed-point clip instructions, frank . chang, 2020/08/17
- [RFC v4 55/70] target/riscv: rvv-1.0: single-width floating-point reduction, frank . chang, 2020/08/17
- [RFC v4 56/70] target/riscv: rvv-1.0: widening floating-point reduction instructions, frank . chang, 2020/08/17
- [RFC v4 57/70] target/riscv: rvv-1.0: single-width scaling shift instructions, frank . chang, 2020/08/17
- [RFC v4 58/70] target/riscv: rvv-1.0: remove widening saturating scaled multiply-add, frank . chang, 2020/08/17