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Thu, 24 Jun 2021 00:15:39 +0000 Received: from DM6PR07MB6618.namprd07.prod.outlook.com ([fe80::20ed:6cd1:4fe2:eea7]) by DM6PR07MB6618.namprd07.prod.outlook.com ([fe80::20ed:6cd1:4fe2:eea7%3]) with mapi id 15.20.4242.023; Thu, 24 Jun 2021 00:15:39 +0000 To: "internals@lists.php.net" Thread-Topic: [PHP-DEV] [RFC] clamp Thread-Index: AQHXaF+YZ/LptmFjT0KKwGBdqqQTnqsiR5Hc Date: Thu, 24 Jun 2021 00:15:38 +0000 Message-ID: References: <0BBAA2F7-02D7-4AEE-B48A-97436A0D8E5D@gmail.com> In-Reply-To: <0BBAA2F7-02D7-4AEE-B48A-97436A0D8E5D@gmail.com> Accept-Language: en-CA, en-US Content-Language: en-CA X-MS-Has-Attach: X-MS-TNEF-Correlator: x-incomingtopheadermarker: OriginalChecksum:EB444DC69DBF450B969B0FA0907BBD9232C98D782AAEC889ECD259F92020A6ED;UpperCasedChecksum:B5B88004657D6539719D8FED405477CDDCF096F91A104AAC7322BF2DCB521CF2;SizeAsReceived:6953;Count:44 x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [5oqV6IQkybx8aIkxibBdMHJgZKynAVsMCv5dFFeBJJBGp7NGkDRchaMYVgGgrFC9] x-ms-publictraffictype: Email x-incomingheadercount: 44 x-eopattributedmessage: 0 x-ms-office365-filtering-correlation-id: b5fd91c6-2dbc-4345-2dbc-08d936a53243 x-ms-traffictypediagnostic: BN8NAM12HT024: x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: FdrF3Rrd+HPY/plhmZTs9JkdAuXCHkS4oETrPIPPYKRf1bFWUvDmoedmk7PAVQdKIgjPchFPCuYHaMxWnBNKFukLjAU5bHVmysyEr2zRuikfr5xm0+m+6Ytl0DvKMDiVeib1dFNXJ0rcNpUZWAxriUpp11X0cWRpJHIB8N/fQXVwPcDJf0ZPgRl9gBT4tmGSPVCy638p1ISfnINQJK8CGUODiM6JYb0ZXNFSKYRMiwfQfoXesCOTxBjzm3G6shf5nP8rwqi7zp4UO31+tpi2mT4ib3P0bTtjOXth2Lz/WltRd+cMG2jwpOhRc4f7BT99pXU3dJtYI/2vnlH1tvGRWxtSwS4OxW40D2uHlnEvKNRty4YqRAl4kj6bsGbiMlADfHRByfzcT5q0SFS47tEv20WHkzMV7z0MGUzBPhSGwqeh9d3SBjdTz8xa/gTtR3iWyLY93fi0fafQJwn3O7Dzig== x-ms-exchange-antispam-messagedata: rOYZWJ6QzeFsBjAsyh+mm6xAf5HTsXSJXkyVQmMaKzCynVVUcEfW+qhBmqWzloICu+Hw076RwH3suMAoz2w2Z2BDfhjCZE36DActFw7k7yuiXBu/irWL8bLahkSiQJrNvnz2AwWlVWQAX19st8oeE2tpBg7IlwnsMLEorLLBuAazEAaMPdq0oNhNoUf30DnaAUNFHhuUCBGR+Su2EGi8Xg== x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: hotmail.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-AuthSource: BN8NAM12FT045.eop-nam12.prod.protection.outlook.com X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: b5fd91c6-2dbc-4345-2dbc-08d936a53243 X-MS-Exchange-CrossTenant-originalarrivaltime: 24 Jun 2021 00:15:38.9043 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Internet X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8NAM12HT024 Subject: Re: [PHP-DEV] [RFC] clamp From: tysonandre775@hotmail.com (tyson andre) Hello Kim Hallberg,=0A= =0A= > The RFC for the clamp function is now open and under discussion, you now = have 2 weeks =0A= > to discuss, suggest improvements and open issues before voting is conside= red.=0A= =0A= =0A= From https://wiki.php.net/rfc/clamp - =0A= =0A= > Current userland implementations are handled in several ways, some of whi= ch use min and max to check the bound,=0A= > which is costly and slow when called often.=0A= > Because userland implementations are for the most part not cost-effective= when called multiple times,=0A= > a language implementation is desired.=0A= =0A= I'd strongly prefer an actual benchmark for context and accuracy - is it ac= tually faster or slower than the most efficient userland implementation and= by how much?=0A= E.g. in an optimized NTS build with `CFLAGS=3D-O2`, opcache enabled(zend_ex= tension=3Dopcache, opcache.enable=3D1,opcache.enable_cli=3D1),=0A= and no debug configure flags, how many calls per second can be made on vari= able values of $num for both?=0A= (I'd assume over twice as fast as calling both min/max from another functio= n, but possibly slower than efficient_clamp, but haven't run this)=0A= =0A= For userland implementations that did use min/max, they probably weren't pe= rformance sensitive for the application.=0A= =0A= ```php=0A= function efficient_clamp(int|float $num, int|float $min, int|float $max): i= nt|float {=0A= return $num < $min ? $min : ($num > $max ? $max : $num);=0A= }=0A= ```=0A= =0A= Thanks,=0A= Tyson=0A=