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Re: [RFC v2 19/76] target/riscv: rvv-0.9: add narrower_nanbox_fpr helper
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From: |
Richard Henderson |
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Subject: |
Re: [RFC v2 19/76] target/riscv: rvv-0.9: add narrower_nanbox_fpr helper |
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Date: |
Wed, 22 Jul 2020 12:15:11 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 7/22/20 2:15 AM, frank.chang@sifive.com wrote:
> From: Frank Chang <frank.chang@sifive.com>
>
> For floating-point operations, the scalar can be taken from a scalar
> f register. If FLEN > SEW, the value in the f registers is checked for
> a valid NaN-boxed value, in which case the least-significant SEW bits
> of the f register are used, else the canonical NaN value is used.
>
> Add helper to generate the correspond NaN-boxed value or the SEW-bit
> canonical NaN for floating-point operations.
>
> Signed-off-by: Frank Chang <frank.chang@sifive.com>
> ---
> target/riscv/helper.h | 2 ++
> target/riscv/vector_helper.c | 32 ++++++++++++++++++++++++++++++++
> 2 files changed, 34 insertions(+)
The helper can be done inline in two tcg ops.
Though, really, we need to coordinate with Liu Zhiwei's other patch set that
also deals with nan-boxing.
r~
- [RFC v2 15/76] target/riscv: rvv-0.9: add fractional LMUL, (continued)
- [RFC v2 15/76] target/riscv: rvv-0.9: add fractional LMUL, frank . chang, 2020/07/22
- [RFC v2 16/76] target/riscv: rvv-0.9: add VMA and VTA, frank . chang, 2020/07/22
- [RFC v2 17/76] target/riscv: rvv-0.9: update check functions, frank . chang, 2020/07/22
- [RFC v2 18/76] target/riscv: introduce more imm value modes in translator functions, frank . chang, 2020/07/22
- [RFC v2 19/76] target/riscv: rvv-0.9: add narrower_nanbox_fpr helper, frank . chang, 2020/07/22
- Re: [RFC v2 19/76] target/riscv: rvv-0.9: add narrower_nanbox_fpr helper,
Richard Henderson <=
- [RFC v2 20/76] target/riscv: rvv-0.9: apply narrower nanbox helper in opfvf_trans, frank . chang, 2020/07/22
- [RFC v2 21/76] target/riscv: rvv-0.9: configure instructions, frank . chang, 2020/07/22
- [RFC v2 22/76] target/riscv: rvv-0.9: stride load and store instructions, frank . chang, 2020/07/22
- [RFC v2 23/76] target/riscv: rvv-0.9: index load and store instructions, frank . chang, 2020/07/22
- [RFC v2 24/76] target/riscv: rvv-0.9: fix address index overflow bug of indexed load/store insns, frank . chang, 2020/07/22
- [RFC v2 25/76] target/riscv: rvv-0.9: fault-only-first unit stride load, frank . chang, 2020/07/22
- [RFC v2 26/76] target/riscv: rvv-0.9: amo operations, frank . chang, 2020/07/22