Re: [RFC 02/15] target/riscv: rvb: count leading/trailing zeros

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Re: [RFC 02/15] target/riscv: rvb: count leading/trailing zeros

From:	Richard Henderson
Subject:	Re: [RFC 02/15] target/riscv: rvb: count leading/trailing zeros
Date:	Thu, 19 Nov 2020 11:48:20 -0800
User-agent:	Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 11/18/20 12:29 AM, frank.chang@sifive.com wrote:
> +# *** RV64B Standard Extension (in addition to RV32B) ***
> +clzw       011000000000 ..... 001 ..... 0011011 @r2
> +ctzw       011000000001 ..... 001 ..... 0011011 @r2

Oh, one more thing.  In the draft, the top decode bits are split into two
fields: 7+5.  It would be easier to read all of these if you did the same here.

r~

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[RFC 00/15] support subsets of bitmanip extension, frank . chang, 2020/11/18
- [RFC 01/15] target/riscv: reformat @sh format encoding for B-extension, frank . chang, 2020/11/18
  - Re: [RFC 01/15] target/riscv: reformat @sh format encoding for B-extension, Richard Henderson, 2020/11/19
- [RFC 02/15] target/riscv: rvb: count leading/trailing zeros, frank . chang, 2020/11/18
  - Re: [RFC 02/15] target/riscv: rvb: count leading/trailing zeros, Richard Henderson, 2020/11/19
  - Re: [RFC 02/15] target/riscv: rvb: count leading/trailing zeros, Richard Henderson <=
- [RFC 03/15] target/riscv: rvb: count bits set, frank . chang, 2020/11/18
  - Re: [RFC 03/15] target/riscv: rvb: count bits set, Richard Henderson, 2020/11/19
- [RFC 04/15] target/riscv: rvb: logic-with-negate, frank . chang, 2020/11/18
  - Re: [RFC 04/15] target/riscv: rvb: logic-with-negate, Richard Henderson, 2020/11/19
- [RFC 05/15] target/riscv: rvb: pack two words into one register, frank . chang, 2020/11/18
  - Re: [RFC 05/15] target/riscv: rvb: pack two words into one register, Richard Henderson, 2020/11/19
- [RFC 06/15] target/riscv: rvb: min/max instructions, frank . chang, 2020/11/18
  - Re: [RFC 06/15] target/riscv: rvb: min/max instructions, Richard Henderson, 2020/11/19
- [RFC 07/15] target/riscv: rvb: sign-extend instructions, frank . chang, 2020/11/18
  - Re: [RFC 07/15] target/riscv: rvb: sign-extend instructions, Richard Henderson, 2020/11/19

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