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Date: Tue, 18 Nov 2025 08:37:07 +0100
Message-ID: <CALJZF3hpDHyE4LPCA1OFNUL3LO_eptGztO9PwnQ6hnrgJpt02w@mail.gmail.com>
Subject: [PHP-DEV] crc-fast support for ext/hash
To: PHP Internals <internals@lists.php.net>
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From: mike@php.net (Michael Wallner)

Hi!

We've been developing a versatile and fast crc library in Rust [1]
and would like to integrate it into PHP upstream [2].

Concerns were raised that the PR at least needs a discussion
here or even an RFC, so here we are!

Note, that it's not about bundling a library, but optional support
through `--with-crc-fast`.

Following is the gist of the library's README:

> World's fastest generic CRC calculator for all known CRC-32
> and CRC-64 variants, as well as bring-your-own custom
> parameters, using SIMD intrinsics, which can exceed
> 100GiB/s on modern systems.
>
> Supports acceleration on aarch64, x86_64, and x86
> architectures, plus has a safe non-accelerated table-based
> software fallback for others.
>
> The crc crate is ~0.5GiB/s by default, so this is up to >220X faster.
>
> This is unique, not just because of the performance, but also
> because I couldn't find a single generic SIMD-accelerated
> implementation (in any language) which worked for all
> known variants, using the Rocksoft model, especially the
> "non-reflected" variants.

Thanks for your time and consideration!

[1] https://github.com/awesomized/crc-fast-rust?tab=readme-ov-file#crc-fast
[2] https://github.com/php/php-src/pull/20513

-- 
Regards,
Mike