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Date: Fri, 20 Jun 2025 11:11:13 +0200
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Subject: Re: [PHP-DEV] [RFC] Drop support for 32bit builds
To: internals@lists.php.net, Hans Henrik Bergan <divinity76@gmail.com>
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From: Marc Bennewitz <marc@mabe.berlin>
To: internals@lists.php.net, Hans Henrik Bergan <divinity76@gmail.com>
Message-ID: <8d317b20-9bb5-41f9-b388-9e5ea1764deb@mabe.berlin>
Subject: Re: [PHP-DEV] [RFC] Drop support for 32bit builds
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    <p><br>
    </p>
    <div class=3D"moz-cite-prefix">On 20.06.25 10:15, Hans Henrik Bergan
      wrote:<br>
    </div>
    <blockquote type=3D"cite"
cite=3D"mid:CAJmy8YGCoFyWK1d9mLF7Pj=3DXrRm7p0By6NY3MfxAjq-oBwwicA@mail.gm=
ail.com">
      <pre wrap=3D"" class=3D"moz-quote-pre">On Fri, 20 Jun 2025 at 09:15=
, Marc Bennewitz <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:marc@m=
abe.berlin">&lt;marc@mabe.berlin&gt;</a> wrote:
</pre>
      <blockquote type=3D"cite">
        <pre wrap=3D"" class=3D"moz-quote-pre">

On 19.06.25 18:08, Calvin Buckley wrote:

I think the biggest arguments against this would be:

- embedded systems; think of PHP in use for i.e. router web UIs. While I
suspect a lot of these are going to be i.e. AArch64/RV64 in the future,
there might be a long tail of existing systems. Of course, how many
would upgrade to PHP 9?

While new deployments trend toward 64-bit (e.g. AArch64), there's definit=
ely a long list of devices =E2=80=94 particularly in legacy environments =
=E2=80=94 still running 32-bit systems. But realistically, how many of th=
ese will ever upgrade to PHP 9? Probably very few. These systems often st=
ay locked to whatever version was originally shipped, and their vendors a=
re unlikely to invest in major version bumps.

- WebAssembly; I don't know how widespread the Memory64 proposal is yet.
We're using WebAssembly in the docs pages for runnable examples.

I don't know either. ChatGPT tells :

</pre>
        <blockquote type=3D"cite">
          <pre wrap=3D"" class=3D"moz-quote-pre">The Memory64 proposal wa=
s formally standardized (Phase 4) in November=E2=80=AF2024, backed by str=
ong votes and endorsement from the WASM Community Group.

It's enabled by default in Firefox 134 and Chrome 133+, with Safari still=
 working on implementation.

Major runtimes like V8, Wasmtime, Wasmer, WASM2C support Memory64

Toolchains including LLVM, Emscripten, Binaryen, WABT support it; WASI=E2=
=80=91SDK has patches in progress
</pre>
        </blockquote>
        <pre wrap=3D"" class=3D"moz-quote-pre">

And some niche cases like i.e. iSH (which emulates x86-32 on iOS).

This seems to be for very niche projects in itself already and running PH=
P within such is even more niche - if present at all (outside of "because=
 I can" reasons).

The other options include making zend_long always 64-bit and accept the
performance penalty for 32-bit, or making 32-bit best-effort rather than
providing any guarantees.

Is int64_t (size of long long 8) available on all systems (like WebAssemb=
ly)?

The downside here, please correct me if I'm wrong, is that this increases=
 complexity instead of reducing it for how much value?
</pre>
      </blockquote>
      <pre wrap=3D"" class=3D"moz-quote-pre">

</pre>
      <blockquote type=3D"cite">
        <pre wrap=3D"" class=3D"moz-quote-pre">This seems to be for very =
niche projects in itself already and running PHP within such is even more=
 niche - if present at all (outside of "because I can" reasons).
</pre>
      </blockquote>
      <pre wrap=3D"" class=3D"moz-quote-pre">
3v4l.org use 32bit WASM php in production, see it for yourself at
<a class=3D"moz-txt-link-freetext" href=3D"https://3v4l.org/">https://3v4=
l.org/</a></pre>
    </blockquote>
    <p>You misunderstood my sentence as I haven't told something else.
      My answer for the niche projects belongs to "... <span
      style=3D"white-space: pre-wrap">i.e. iSH (which emulates x86-32 on =
iOS).<span
      style=3D"white-space: normal">"</span></span></p>
    <p><span style=3D"white-space: pre-wrap"><span
      style=3D"white-space: normal">About </span></span><span
      style=3D"white-space: pre-wrap">WebAssembly <span
      style=3D"white-space: normal">I wrote:</span></span></p>
    <pre wrap=3D"" class=3D"moz-quote-pre">&gt; I don't know either. Chat=
GPT tells :

</pre>
    <blockquote type=3D"cite">
      <pre wrap=3D"" class=3D"moz-quote-pre">The Memory64 proposal was fo=
rmally standardized (Phase 4) in November=E2=80=AF2024, backed by strong =
votes and endorsement from the WASM Community Group.

It's enabled by default in Firefox 134 and Chrome 133+, with Safari still=
 working on implementation.

Major runtimes like V8, Wasmtime, Wasmer, WASM2C support Memory64

Toolchains including LLVM, Emscripten, Binaryen, WABT support it; WASI=E2=
=80=91SDK has patches in progress
</pre>
    </blockquote>
    <p></p>
    <p><span style=3D"white-space: pre-wrap">
</span></p>
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