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To: "'Kyle Katarn'" <kylekatarnls@gmail.com>
Cc: "'PHP Internals'" <internals@lists.php.net>
References: <CANBC5np5gFoG2vy572K_rV5df58qBJdQuKsmYdHiprA2mLPWUg@mail.gmail.com> <c9acda400885e3c78775e400cb492538@bastelstu.be> <CANBC5noypta7=YvVaAB6sPFhQKQCxJTFMQZ7fEShii2isya49A@mail.gmail.com> <0027ab13-89fb-40b4-991b-2f88a35c2f31@gmx.de> <CANBC5npgKA2T51t9=CD8LcqZsbLY-mW1GUepyGkZLPEGtVxoPA@mail.gmail.com>
In-Reply-To: <CANBC5npgKA2T51t9=CD8LcqZsbLY-mW1GUepyGkZLPEGtVxoPA@mail.gmail.com>
Subject: RE: [PHP-DEV] [RFC] Add clamp function
Date: Fri, 22 Aug 2025 14:30:26 +0300
Message-ID: <011001dc1358$287f1860$797d4920$@glaive.pro>
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From: juris@glaive.pro ("Juris Evertovskis")

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From: Kyle Katarn <kylekatarnls@gmail.com>=20
Sent: Friday, August 22, 2025 11:02 AM
To: Christoph M. Becker <cmbecker69@gmx.de>
Cc: Tim D=C3=BCsterhus <tim@bastelstu.be>; PHP Internals =
<internals@lists.php.net>
Subject: Re: [PHP-DEV] [RFC] Add clamp function

> I created https://wiki.php.net/rfc/clamp_v2 (re-using most of the info =
from https://wiki.php.net/rfc/clamp).

Hey,

=20

I=E2=80=99m not against adding such a function, but I noticed that the =
RFC says

=20

> some of which use min <https://www.php.net/manual/en/function.min.php> =
 and max <https://www.php.net/manual/en/function.max.php>  to check the =
bound, which is costly and slow when called often

=20

What makes them slow? If we can create a significantly faster `clamp`, =
can we use the same optimizations to improve min and max?

=20

BR,

Juris


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class=3DWordSection1><div style=3D'border:none;border-top:solid #E1E1E1 =
1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=3DMsoNormal><b><span =
style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span><=
/b><span style=3D'font-size:11.0pt;font-family:"Calibri",sans-serif'> =
Kyle Katarn &lt;kylekatarnls@gmail.com&gt; <br><b>Sent:</b> Friday, =
August 22, 2025 11:02 AM<br><b>To:</b> Christoph M. Becker =
&lt;cmbecker69@gmx.de&gt;<br><b>Cc:</b> Tim D=C3=BCsterhus =
&lt;tim@bastelstu.be&gt;; PHP Internals =
&lt;internals@lists.php.net&gt;<br><b>Subject:</b> Re: [PHP-DEV] [RFC] =
Add clamp function</span><br><br>&gt; I created&nbsp;<a =
href=3D"https://wiki.php.net/rfc/clamp_v2" =
target=3D"_blank">https://wiki.php.net/rfc/clamp_v2</a> (re-using most =
of the info from&nbsp;<a href=3D"https://wiki.php.net/rfc/clamp" =
target=3D"_blank">https://wiki.php.net/rfc/clamp</a>).<br><br><span =
style=3D'font-size:11.0pt'>Hey,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>I=E2=80=99m not =
against adding such a function, but I noticed that the RFC =
says<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>&gt; some of which =
use&nbsp;<a href=3D"https://www.php.net/manual/en/function.min.php" =
title=3D"https://www.php.net/manual/en/function.min.php">min</a>&nbsp;and=
&nbsp;<a href=3D"https://www.php.net/manual/en/function.max.php" =
title=3D"https://www.php.net/manual/en/function.max.php">max</a>&nbsp;to =
check the bound, which is costly and slow when called =
often<o:p></o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span style=3D'font-size:11.0pt'>What makes them slow? =
If we can create a significantly faster `clamp`, can we use the same =
optimizations to improve min and max?<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>BR,<o:p></o:p></span></p><p =
class=3DMsoNormal><span =
style=3D'font-size:11.0pt'>Juris<o:p></o:p></span></p></div></div></body>=
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