Re: [PATCH v4 01/12] util: Add RISC-V vector extension probe in cpuinfo

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Re: [PATCH v4 01/12] util: Add RISC-V vector extension probe in cpuinfo

From:	Richard Henderson
Subject:	Re: [PATCH v4 01/12] util: Add RISC-V vector extension probe in cpuinfo
Date:	Wed, 18 Sep 2024 12:14:03 +0200
User-agent:	Mozilla Thunderbird

On 9/18/24 07:14, LIU Zhiwei wrote:

On 2024/9/12 2:34, Richard Henderson wrote:
On 9/11/24 06:26, LIU Zhiwei wrote:
While the compiler doesn't support RISCV_HWPROBE_EXT_ZVE64X,
we use RISCV_HWPROBE_IMA_V instead.
Language is incorrect here.  The compiler has nothing to do with it.
Perhaps "If the installed kernel header files do not support...".
OK. Thanks.
However, if you use only RISCV_HWPROBE_IMA_V, then you do not have any of the additionalguarantees of Zve64x.
IMHO, RISCV_HWPROBE_IMA_V is more strictly constrainted than 
RISCV_HWPROBE_EXT_ZVE64X.
At least in current QEMU implemenation, the V vector extension depends on the Zve64dextension.


Ok.  That is a better explanation for the patch description.


r~

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[PATCH v4 08/12] tcg/riscv: Implement vector sat/mul ops, (continued)
- [PATCH v4 08/12] tcg/riscv: Implement vector sat/mul ops, LIU Zhiwei, 2024/09/11
- [PATCH v4 09/12] tcg/riscv: Implement vector min/max ops, LIU Zhiwei, 2024/09/11
- [PATCH v4 10/12] tcg/riscv: Implement vector shi/s/v ops, LIU Zhiwei, 2024/09/11
  - Re: [PATCH v4 10/12] tcg/riscv: Implement vector shi/s/v ops, Richard Henderson, 2024/09/11
- [PATCH v4 11/12] tcg/riscv: Implement vector roti/v/x ops, LIU Zhiwei, 2024/09/11
  - Re: [PATCH v4 11/12] tcg/riscv: Implement vector roti/v/x ops, Richard Henderson, 2024/09/11
- [PATCH v4 12/12] tcg/riscv: Enable native vector support for TCG host, LIU Zhiwei, 2024/09/11
- [PATCH v4 01/12] util: Add RISC-V vector extension probe in cpuinfo, LIU Zhiwei, 2024/09/11
  - Re: [PATCH v4 01/12] util: Add RISC-V vector extension probe in cpuinfo, Richard Henderson, 2024/09/11
    - Re: [PATCH v4 01/12] util: Add RISC-V vector extension probe in cpuinfo, LIU Zhiwei, 2024/09/18
    - Re: [PATCH v4 01/12] util: Add RISC-V vector extension probe in cpuinfo, Richard Henderson <=
- [PATCH v4 02/12] tcg/riscv: Add basic support for vector, LIU Zhiwei, 2024/09/11
  - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, Richard Henderson, 2024/09/11
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, LIU Zhiwei, 2024/09/18
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, Richard Henderson, 2024/09/18
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, LIU Zhiwei, 2024/09/18
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, Richard Henderson, 2024/09/19
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, 0x48 Swung, 2024/09/20
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, LIU Zhiwei, 2024/09/20
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, LIU Zhiwei, 2024/09/20
    - Re: [PATCH v4 02/12] tcg/riscv: Add basic support for vector, 0x48 Swung, 2024/09/21

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