Re: Improve CRC32C performance on SSE4.2

On Sat, Jun 14, 2025 at 03:47:33PM +0200, Tomas Vondra wrote:
> I suggest you try with a newer gcc, perhaps 13.4. There's been a bunch
> of fixes related to AVX512 since 13.0, chances are this was already
> fixed. I don't see this failure on 14.3.1.

From the config.log, it looks like Andy is using clang:

    configure:3998: clang --version >&5
    clang version 18.1.6 (https://gitee.com/mirrors/llvm-project.git 1118c2e05e67a36ed8ca250524525cdb66a55256)

And I see -O0 used, too, which would match the existing report [0],
although that report is for clang 19.1.7.

I'm also genuinely curious why folks are using -O0...

[0] https://postgr.es/m/CAE-ML%2B-OV6p9uvCFBcSQjZUEh__y0h-KjN%2BBseyGJHt7u8EP%2Bw%40mail.gmail.com

-- 
nathan