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  <title>P3441R2: Rename &lt;code>simd_split&lt;/code> to &lt;code>simd_chunk&lt;/code></title>
<style data-fill-with="stylesheet">/******************************************************************************
 *                   Style sheet for the W3C specifications                   *
 *
 * Special classes handled by this style sheet include:
 *
 * Indices
 *   - .toc for the Table of Contents (<ol class="toc">)
 *     + <span class="secno"> for the section numbers
 *   - #toc for the Table of Contents (<nav id="toc">)
 *   - ul.index for Indices (<a href="#ref">term</a><span>, in § N.M</span>)
 *   - table.index for Index Tables (e.g. for properties or elements)
 *
 * Structural Markup
 *   - table.data for general data tables
 *     -> use 'scope' attribute, <colgroup>, <thead>, and <tbody> for best results !
 *     -> use <table class='complex data'> for extra-complex tables
 *     -> use <td class='long'> for paragraph-length cell content
 *     -> use <td class='pre'> when manual line breaks/indentation would help readability
 *   - dl.switch for switch statements
 *   - ol.algorithm for algorithms (helps to visualize nesting)
 *   - .figure and .caption (HTML4) and figure and figcaption (HTML5)
 *     -> .sidefigure for right-floated figures
 *   - ins/del
 *     -> ins/del.c### for candidate and proposed changes (amendments)
 *
 * Code
 *   - pre and code
 *
 * Special Sections
 *   - .note       for informative notes             (div, p, span, aside, details)
 *   - .example    for informative examples          (div, p, pre, span)
 *   - .issue      for issues                        (div, p, span)
 *   - .advisement for loud normative statements     (div, p, strong)
 *   - .annoying-warning for spec obsoletion notices (div, aside, details)
 *   - .correction for "candidate corrections"       (div, aside, details, section)
 *   - .addition   for "candidate additions"         (div, aside, details, section)
 *   - .correction.proposed for "proposed corrections" (div, aside, details, section)
 *   - .addition.proposed   for "proposed additions"   (div, aside, details, section)
 *
 * Definition Boxes
 *   - pre.def   for WebIDL definitions
 *   - table.def for tables that define other entities (e.g. CSS properties)
 *   - dl.def    for definition lists that define other entitles (e.g. HTML elements)
 *
 * Numbering
 *   - .secno for section numbers in .toc and headings (<span class='secno'>3.2</span>)
 *   - .marker for source-inserted example/figure/issue numbers (<span class='marker'>Issue 4</span>)
 *   - ::before styled for CSS-generated issue/example/figure numbers:
 *     -> Documents wishing to use this only need to add
 *        figcaption::before,
 *        .caption::before { content: "Figure "  counter(figure) " ";  }
 *        .example::before { content: "Example " counter(example) " "; }
 *        .issue::before   { content: "Issue "   counter(issue) " ";   }
 *
 * Header Stuff (ignore, just don't conflict with these classes)
 *   - .head for the header
 *   - .copyright for the copyright
 *
 * Outdated warning for old specs
 *
 * Miscellaneous
 *   - .overlarge for things that should be as wide as possible, even if
 *     that overflows the body text area. This can be used on an item or
 *     on its container, depending on the effect desired.
 *     Note that this styling basically doesn't help at all when printing,
 *     since A4 paper isn't much wider than the max-width here.
 *     It's better to design things to fit into a narrower measure if possible.
 *
 *   - js-added ToC jump links (see fixup.js)
 *
 ******************************************************************************/

/* color variables included separately for reliability */

/******************************************************************************/
/*                                    Body                                    */
/******************************************************************************/

	html {
	}

	body {
		counter-reset: example figure issue;

		/* Layout */
		max-width: 50em;			  /* limit line length to 50em for readability   */
		margin: 0 auto;				/* center text within page                    */
		padding: 1.6em 1.5em 2em 50px; /* assume 16px font size for downlevel clients */
		padding: 1.6em 1.5em 2em calc(26px + 1.5em); /* leave space for status flag    */

		/* Typography */
		line-height: 1.5;
		font-family: sans-serif;
		widows: 2;
		orphans: 2;
		word-wrap: break-word;
		overflow-wrap: break-word;
		hyphens: auto;

		color: black;
		color: var(--text);
		background: white top left fixed no-repeat;
		background: var(--bg) top left fixed no-repeat;
		background-size: 25px auto;
	}


/******************************************************************************/
/*                         Front Matter & Navigation                          */
/******************************************************************************/

/** Header ********************************************************************/

	div.head { margin-bottom: 1em; }
	div.head hr { border-style: solid; }

	div.head h1 {
		font-weight: bold;
		margin: 0 0 .1em;
		font-size: 220%;
	}

	div.head h2 { margin-bottom: 1.5em;}

/** W3C Logo ******************************************************************/

	.head .logo {
		float: right;
		margin: 0.4rem 0 0.2rem .4rem;
	}

	.head img[src*="logos/W3C"] {
		display: block;
		border: solid #1a5e9a;
		border: solid var(--logo-bg);
		border-width: .65rem .7rem .6rem;
		border-radius: .4rem;
		background: #1a5e9a;
		background: var(--logo-bg);
		color: white;
		color: var(--logo-text);
		font-weight: bold;
	}

	.head a:hover > img[src*="logos/W3C"],
	.head a:focus > img[src*="logos/W3C"] {
		opacity: .8;
	}

	.head a:active > img[src*="logos/W3C"] {
		background: #c00;
		background: var(--logo-active-bg);
		border-color: #c00;
		border-color: var(--logo-active-bg);
	}

	/* see also additional rules in Link Styling section */

/** Copyright *****************************************************************/

	p.copyright,
	p.copyright small { font-size: small; }

/** Back to Top / ToC Toggle **************************************************/

	@media print {
		#toc-nav {
			display: none;
		}
	}
	@media not print {
		#toc-nav {
			position: fixed;
			z-index: 3;
			bottom: 0; left: 0;
			margin: 0;
			min-width: 1.33em;
			border-top-right-radius: 2rem;
			box-shadow: 0 0 2px;
			font-size: 1.5em;
		}
		#toc-nav > a {
			display: block;
			white-space: nowrap;

			height: 1.33em;
			padding: .1em 0.3em;
			margin: 0;

			box-shadow: 0 0 2px;
			border: none;
			border-top-right-radius: 1.33em;

			color: #707070;
			color: var(--tocnav-normal-text);
			background: white;
			background: var(--tocnav-normal-bg);
		}
		#toc-nav > a:hover,
		#toc-nav > a:focus {
			color: black;
			color: var(--tocnav-hover-text);
			background: #f8f8f8;
			background: var(--tocnav-hover-bg);
		}
		#toc-nav > a:active {
			color: #c00;
			color: var(--tocnav-active-text);
			background: white;
			background: var(--tocnav-active-bg);
		}

		#toc-nav > #toc-jump {
			padding-bottom: 2em;
			margin-bottom: -1.9em;
		}

		/* statusbar gets in the way on keyboard focus; remove once browsers fix */
		#toc-nav > a[href="#toc"]:not(:hover):focus:last-child {
			padding-bottom: 1.5rem;
		}

		#toc-nav:not(:hover) > a:not(:focus) > span + span {
			/* Ideally this uses :focus-within on #toc-nav */
			display: none;
		}
		#toc-nav > a > span + span {
			padding-right: 0.2em;
		}
	}

/** ToC Sidebar ***************************************************************/

	/* Floating sidebar */
	@media screen {
		body.toc-sidebar #toc {
			position: fixed;
			top: 0; bottom: 0;
			left: 0;
			width: 23.5em;
			max-width: 80%;
			max-width: calc(100% - 2em - 26px);
			overflow: auto;
			padding: 0 1em;
			padding-left: 42px;
			padding-left: calc(1em + 26px);
			color: black;
			color: var(--tocsidebar-text);
			background: inherit;
			background-color: #f7f8f9;
			background-color: var(--tocsidebar-bg);
			z-index: 1;
			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
		}
		body.toc-sidebar #toc h2 {
			margin-top: .8rem;
			font-variant: small-caps;
			font-variant: all-small-caps;
			text-transform: lowercase;
			font-weight: bold;
			color: gray;
			color: hsla(203,20%,40%,.7);
			color: var(--tocsidebar-heading-text);
		}
		body.toc-sidebar #toc-jump:not(:focus) {
			width: 0;
			height: 0;
			padding: 0;
			position: absolute;
			overflow: hidden;
		}
	}
	/* Hide main scroller when only the ToC is visible anyway */
	@media screen and (max-width: 28em) {
		body.toc-sidebar {
			overflow: hidden;
		}
	}

	/* Sidebar with its own space */
	@media screen and (min-width: 78em) {
		body:not(.toc-inline) #toc {
			position: fixed;
			top: 0; bottom: 0;
			left: 0;
			width: 23.5em;
			overflow: auto;
			padding: 0 1em;
			padding-left: 42px;
			padding-left: calc(1em + 26px);
			color: black;
			color: var(--tocsidebar-text);
			background: inherit;
			background-color: #f7f8f9;
			background-color: var(--tocsidebar-bg);
			z-index: 1;
			box-shadow: -.1em 0 .25em rgba(0,0,0,.1) inset;
			box-shadow: -.1em 0 .25em var(--tocsidebar-shadow) inset;
		}
		body:not(.toc-inline) #toc h2 {
			margin-top: .8rem;
			font-variant: small-caps;
			font-variant: all-small-caps;
			text-transform: lowercase;
			font-weight: bold;
			color: gray;
			color: hsla(203,20%,40%,.7);
			color: var(--tocsidebar-heading-text);
		}

		body:not(.toc-inline) {
			padding-left: 29em;
		}
		/* See also Overflow section at the bottom */

		body:not(.toc-inline) #toc-jump:not(:focus) {
			width: 0;
			height: 0;
			padding: 0;
			position: absolute;
			overflow: hidden;
		}
	}
	@media screen and (min-width: 90em) {
		body:not(.toc-inline) {
			margin: 0 4em;
		}
	}

/******************************************************************************/
/*                                Sectioning                                  */
/******************************************************************************/

/** Headings ******************************************************************/

	h1, h2, h3, h4, h5, h6, dt {
		page-break-after: avoid;
		page-break-inside: avoid;
		font: 100% sans-serif;   /* Reset all font styling to clear out UA styles */
		font-family: inherit;	/* Inherit the font family. */
		line-height: 1.2;		/* Keep wrapped headings compact */
		hyphens: manual;		/* Hyphenated headings look weird */
	}

	h2, h3, h4, h5, h6 {
		margin-top: 3rem;
	}

	h1, h2, h3 {
		color: #005A9C;
		color: var(--heading-text);
	}

	h1 { font-size: 170%; }
	h2 { font-size: 140%; }
	h3 { font-size: 120%; }
	h4 { font-weight: bold; }
	h5 { font-style: italic; }
	h6 { font-variant: small-caps; }
	dt { font-weight: bold; }

/** Subheadings ***************************************************************/

	h1 + h2,
	#profile-and-date {
		/* #profile-and-date is a subtitle in an H2 under the H1 */
		margin-top: 0;
	}
	h2 + h3,
	h3 + h4,
	h4 + h5,
	h5 + h6 {
		margin-top: 1.2em; /* = 1 x line-height */
	}

/** Section divider ***********************************************************/

	:not(.head) > :not(.head) + hr {
		font-size: 1.5em;
		text-align: center;
		margin: 1em auto;
		height: auto;
		color: black;
		color: var(--hr-text);
		border: transparent solid 0;
		background: transparent;
	}
	:not(.head) > hr::before {
		content: "\2727\2003\2003\2727\2003\2003\2727";
	}

/******************************************************************************/
/*                            Paragraphs and Lists                            */
/******************************************************************************/

	p {
		margin: 1em 0;
	}

	dd > p:first-child,
	li > p:first-child {
		margin-top: 0;
	}

	ul, ol {
		margin-left: 0;
		padding-left: 2em;
	}

	li {
		margin: 0.25em 0 0.5em;
		padding: 0;
	}

	dl dd {
		margin: 0 0 .5em 2em;
	}

	.head dd + dd { /* compact for header */
		margin-top: -.5em;
	}

	/* Style for algorithms */
	ol.algorithm ol:not(.algorithm),
	.algorithm > ol ol:not(.algorithm) {
	border-left: 0.5em solid #DEF;
	border-left: 0.5em solid var(--algo-border);
	}

	/* Put nice boxes around each algorithm. */
	[data-algorithm]:not(.heading) {
	 padding: .5em;
	 border: thin solid #ddd;
	 border: thin solid var(--algo-border);
	 border-radius: .5em;
	 margin: .5em calc(-0.5em - 1px);
	}
	[data-algorithm]:not(.heading) > :first-child {
	 margin-top: 0;
	}
	[data-algorithm]:not(.heading) > :last-child {
	 margin-bottom: 0;
	}

	/* Style for switch/case <dl>s */
	dl.switch > dd > ol.only,
	dl.switch > dd > .only > ol {
	margin-left: 0;
	}
	dl.switch > dd > ol.algorithm,
	dl.switch > dd > .algorithm > ol {
	margin-left: -2em;
	}
	dl.switch {
	padding-left: 2em;
	}
	dl.switch > dt {
	text-indent: -1.5em;
	margin-top: 1em;
	}
	dl.switch > dt + dt {
	margin-top: 0;
	}
	dl.switch > dt::before {
	content: '\21AA';
	padding: 0 0.5em 0 0;
	display: inline-block;
	width: 1em;
	text-align: right;
	line-height: 0.5em;
	}

/** Terminology Markup ********************************************************/


/******************************************************************************/
/*                                 Inline Markup                              */
/******************************************************************************/

/** Terminology Markup ********************************************************/
	dfn   { /* Defining instance */
		font-weight: bolder;
	}
	a > i { /* Instance of term */
		font-style: normal;
	}
	dt dfn code, code.idl {
		font-size: inherit;
	}
	dfn var {
		font-style: normal;
	}

/** Change Marking ************************************************************/

	del {
		color: #aa0000;
		color: var(--del-text);
		background: transparent;
		background: var(--del-bg);
		text-decoration: line-through;
	}
	ins {
		color: #006100;
		color: var(--ins-text);
		background: transparent;
		background: var(--ins-bg);
		text-decoration: underline;
	}

	/* for amendments (candidate/proposed changes) */

	.amendment ins, .correction ins, .addition ins,
	ins[class^=c] {
		text-decoration-style: dotted;
	}
	.amendment del, .correction del, .addition del,
	del[class^=c] {
		text-decoration-style: dotted;
	}
	.amendment.proposed ins, .correction.proposed ins, .addition.proposed ins,
	ins[class^=c].proposed {
		text-decoration-style: double;
	}
	.amendment.proposed del, .correction.proposed del, .addition.proposed del,
	del[class^=c].proposed {
		text-decoration-style: double;
	}

/** Miscellaneous improvements to inline formatting ***************************/

	sup {
		vertical-align: super;
		font-size: 80%
	}

/******************************************************************************/
/*                                    Code                                    */
/******************************************************************************/

/** General monospace/pre rules ***********************************************/

	pre, code, samp {
		font-family: Menlo, Consolas, "DejaVu Sans Mono", Monaco, monospace;
		font-size: .9em;
		hyphens: none;
		text-transform: none;
		text-align: left;
		text-align: start;
		font-variant: normal;
		orphans: 3;
		widows: 3;
		page-break-before: avoid;
	}
	pre code,
	code code {
		font-size: 100%;
	}

	pre {
		margin-top: 1em;
		margin-bottom: 1em;
		overflow: auto;
	}

/** Inline Code fragments *****************************************************/

	/* Do something nice. */

/******************************************************************************/
/*                                    Links                                   */
/******************************************************************************/

/** General Hyperlinks ********************************************************/

	/* We hyperlink a lot, so make it less intrusive */
	a[href] {
		color: #034575;
		color: var(--a-normal-text);
		text-decoration: underline #707070;
		text-decoration: underline var(--a-normal-underline);
		text-decoration-skip-ink: none;
	}
	a:visited {
		color: #034575;
		color: var(--a-visited-text);
		text-decoration-color: #bbb;
		text-decoration-color: var(--a-visited-underline);
	}

	/* Indicate interaction with the link */
	a[href]:focus,
	a[href]:hover {
		text-decoration-thickness: 2px;
	}
	a[href]:active {
		color: #c00;
		color: var(--a-active-text);
		text-decoration-color: #c00;
		text-decoration-color: var(--a-active-underline);
	}

	/* Backout above styling for W3C logo */
	.head .logo,
	.head .logo a {
		border: none;
		text-decoration: none;
		background: transparent;
	}

/******************************************************************************/
/*                                    Images                                  */
/******************************************************************************/

	img {
		border-style: none;
	}

	img, svg {
		/* Intentionally not color-scheme aware. */
		background: white;
	}

	/* For autogen numbers, add
	  .caption::before, figcaption::before { content: "Figure " counter(figure) ". "; }
	*/

	figure, .figure, .sidefigure {
		page-break-inside: avoid;
		text-align: center;
		margin: 2.5em 0;
	}
	.figure img,	.sidefigure img,	figure img,
	.figure object, .sidefigure object, figure object {
		max-width: 100%;
		margin: auto;
		height: auto;
	}
	.figure pre, .sidefigure pre, figure pre {
		text-align: left;
		display: table;
		margin: 1em auto;
	}
	.figure table, figure table {
		margin: auto;
	}
	@media screen and (min-width: 20em) {
		.sidefigure {
			float: right;
			width: 50%;
			margin: 0 0 0.5em 0.5em;
		}
	}
	.caption, figcaption, caption {
		font-style: italic;
		font-size: 90%;
	}
	.caption::before, figcaption::before, figcaption > .marker {
		font-weight: bold;
	}
	.caption, figcaption {
		counter-increment: figure;
	}

	/* DL list is indented 2em, but figure inside it is not */
	dd > .figure, dd > figure { margin-left: -2em; }

/******************************************************************************/
/*                             Colored Boxes                                  */
/******************************************************************************/

	.issue, .note, .example, .assertion, .advisement, blockquote,
	.amendment, .correction, .addition {
		margin: 1em auto;
		padding: .5em;
		border: .5em;
		border-left-style: solid;
		page-break-inside: avoid;
	}
	span.issue, span.note {
		padding: .1em .5em .15em;
		border-right-style: solid;
	}

	blockquote > :first-child,
	.note  > p:first-child,
	.issue > p:first-child,
	.amendment > p:first-child,
	.correction > p:first-child,
	.addition > p:first-child {
		margin-top: 0;
	}
	blockquote > :last-child,
	.note  > p:last-child,
	.issue > p:last-child,
	.amendment > p:last-child,
	.correction > p:last-child,
	.addition > p:last-child {
		margin-bottom: 0;
	}


	.issue::before, .issue > .marker,
	.example::before, .example > .marker,
	.note::before, .note > .marker,
	details.note > summary > .marker,
	.amendment::before, .amendment > .marker,
	details.amendment > summary > .marker,
	.addition::before, .addition > .marker,
	addition.amendment > summary > .marker,
	.correction::before, .correction > .marker,
	correction.amendment > summary > .marker
	{
		text-transform: uppercase;
		padding-right: 1em;
	}

	.example::before, .example > .marker {
		display: block;
		padding-right: 0em;
	}

/** Blockquotes ***************************************************************/

	blockquote {
		border-color: silver;
		border-color: var(--blockquote-border);
		background: transparent;
		background: var(--blockquote-bg);
		color: currentcolor;
		color: var(--blockquote-text);
	}

/** Open issue ****************************************************************/

	.issue {
		border-color: #e05252;
		border-color: var(--issue-border);
		background: #fbe9e9;
		background: var(--issue-bg);
		color: black;
		color: var(--issue-text);
		counter-increment: issue;
		overflow: auto;
	}
	.issue::before, .issue > .marker {
		color: #831616;
		color: var(--issueheading-text);
	}
	/* Add .issue::before { content: "Issue " counter(issue) " "; } for autogen numbers,
	  or use class="marker" to mark up the issue number in source. */

/** Example *******************************************************************/

	.example {
		border-color: #e0cb52;
		border-color: var(--example-border);
		background: #fcfaee;
		background: var(--example-bg);
		color: black;
		color: var(--example-text);
		counter-increment: example;
		overflow: auto;
		clear: both;
	}
	.example::before, .example > .marker {
		color: #574b0f;
		color: var(--exampleheading-text);
	}
	/* Add .example::before { content: "Example " counter(example) " "; } for autogen numbers,
	  or use class="marker" to mark up the example number in source. */

/** Non-normative Note ********************************************************/

	.note {
		border-color: #52e052;
		border-color: var(--note-border);
		background: #e9fbe9;
		background: var(--note-bg);
		color: black;
		color: var(--note-text);
		overflow: auto;
	}

	.note::before, .note > .marker,
	details.note > summary {
		color: hsl(120, 70%, 30%);
		color: var(--noteheading-text);
	}
	/* Add .note::before { content: "Note "; } for autogen label,
	  or use class="marker" to mark up the label in source. */

	details.note[open] > summary {
		border-bottom: 1px silver solid;
		border-bottom: 1px var(--notesummary-underline) solid;
	}

/** Assertion Box *************************************************************/
	/*  for assertions in algorithms */

	.assertion {
		border-color: #AAA;
		border-color: var(--assertion-border);
		background: #EEE;
		background: var(--assertion-bg);
		color: black;
		color: var(--assertion-text);
	}

/** Advisement Box ************************************************************/
	/*  for attention-grabbing normative statements */

	.advisement {
		border-color: orange;
		border-color: var(--advisement-border);
		border-style: none solid;
		background: #fec;
		background: var(--advisement-bg);
		color: black;
		color: var(--advisement-text);
	}
	strong.advisement {
		display: block;
		text-align: center;
	}
	.advisement::before, .advisement > .marker {
		color: #b35f00;
		color: var(--advisementheading-text);
	}

/** Amendment Box *************************************************************/

	.amendment, .correction, .addition {
		border-color: #330099;
		border-color: var(--amendment-border);
		background: #F5F0FF;
		background: var(--amendment-bg);
		color: black;
		color: var(--amendment-text);
	}
	.amendment.proposed, .correction.proposed, .addition.proposed {
		border-style: solid;
		border-block-width: 0.25em;
	}
	.amendment::before, .amendment > .marker,
	details.amendment > summary::before, details.amendment > summary > .marker,
	.correction::before, .correction > .marker,
	details.correction > summary::before, details.correction > summary > .marker,
	.addition::before, .addition > .marker,
	details.addition > summary::before, details.addition > summary > .marker {
		color: #220066;
		color: var(--amendmentheading-text);
	}
	.amendment.proposed::before, .amendment.proposed > .marker,
	details.amendment.proposed > summary::before, details.amendment.proposed > summary > .marker,
	.correction.proposed::before, .correction.proposed > .marker,
	details.correction.proposed > summary::before, details.correction.proposed > summary > .marker,
	.addition.proposed::before, .addition.proposed > .marker,
	details.addition.proposed > summary::before, details.addition.proposed > summary > .marker {
		font-weight: bold;
	}

/** Spec Obsoletion Notice ****************************************************/
	/* obnoxious obsoletion notice for older/abandoned specs. */

	details {
		display: block;
	}
	summary {
		font-weight: bolder;
	}

	.annoying-warning:not(details),
	details.annoying-warning:not([open]) > summary,
	details.annoying-warning[open] {
		background: hsla(40,100%,50%,0.95);
		background: var(--warning-bg);
		color: black;
		color: var(--warning-text);
		padding: .75em 1em;
		border: red;
		border: var(--warning-border);
		border-style: solid none;
		box-shadow: 0 2px 8px black;
		text-align: center;
	}
	.annoying-warning :last-child {
		margin-bottom: 0;
	}

@media not print {
	details.annoying-warning[open] {
		position: fixed;
		left: 0;
		right: 0;
		bottom: 2em;
		z-index: 1000;
	}
}

	details.annoying-warning:not([open]) > summary {
		text-align: center;
	}

/** Entity Definition Boxes ***************************************************/

	.def {
		padding: .5em 1em;
		background: #def;
		background: var(--def-bg);
		margin: 1.2em 0;
		border-left: 0.5em solid #8ccbf2;
		border-left: 0.5em solid var(--def-border);
		color: black;
		color: var(--def-text);
	}

/******************************************************************************/
/*                                    Tables                                  */
/******************************************************************************/

	th, td {
		text-align: left;
		text-align: start;
	}

/** Property/Descriptor Definition Tables *************************************/

	table.def {
		/* inherits .def box styling, see above */
		width: 100%;
		border-spacing: 0;
	}

	table.def td,
	table.def th {
		padding: 0.5em;
		vertical-align: baseline;
		border-bottom: 1px solid #bbd7e9;
		border-bottom: 1px solid var(--defrow-border);
	}

	table.def > tbody > tr:last-child th,
	table.def > tbody > tr:last-child td {
		border-bottom: 0;
	}

	table.def th {
		font-style: italic;
		font-weight: normal;
		padding-left: 1em;
		width: 3em;
	}

	/* For when values are extra-complex and need formatting for readability */
	table td.pre {
		white-space: pre-wrap;
	}

	/* A footnote at the bottom of a def table */
	table.def td.footnote {
		padding-top: 0.6em;
	}
	table.def td.footnote::before {
		content: " ";
		display: block;
		height: 0.6em;
		width: 4em;
		border-top: thin solid;
	}

/** Data tables (and properly marked-up index tables) *************************/
	/*
		<table class="data"> highlights structural relationships in a table
		when correct markup is used (e.g. thead/tbody, th vs. td, scope attribute)

		Use class="complex data" for particularly complicated tables --
		(This will draw more lines: busier, but clearer.)

		Use class="long" on table cells with paragraph-like contents
		(This will adjust text alignment accordingly.)
		Alternately use class="longlastcol" on tables, to have the last column assume "long".
	*/

	table {
		word-wrap: normal;
		overflow-wrap: normal;
		hyphens: manual;
	}

	table.data,
	table.index {
		margin: 1em auto;
		border-collapse: collapse;
		border: hidden;
		width: 100%;
	}
	table.data caption,
	table.index caption {
		max-width: 50em;
		margin: 0 auto 1em;
	}

	table.data td,  table.data th,
	table.index td, table.index th {
		padding: 0.5em 1em;
		border-width: 1px;
		border-color: silver;
		border-color: var(--datacell-border);
		border-top-style: solid;
	}

	table.data thead td:empty {
		padding: 0;
		border: 0;
	}

	table.data  thead,
	table.index thead,
	table.data  tbody,
	table.index tbody {
		border-bottom: 2px solid;
	}

	table.data colgroup,
	table.index colgroup {
		border-left: 2px solid;
	}

	table.data  tbody th:first-child,
	table.index tbody th:first-child  {
		border-right: 2px solid;
		border-top: 1px solid silver;
		border-top: 1px solid var(--datacell-border);
		padding-right: 1em;
	}

	table.data th[colspan],
	table.data td[colspan] {
		text-align: center;
	}

	table.complex.data th,
	table.complex.data td {
		border: 1px solid silver;
		border: 1px solid var(--datacell-border);
		text-align: center;
	}

	table.data.longlastcol td:last-child,
	table.data td.long {
		vertical-align: baseline;
		text-align: left;
	}

	table.data img {
		vertical-align: middle;
	}


/*
Alternate table alignment rules

	table.data,
	table.index {
		text-align: center;
	}

	table.data  thead th[scope="row"],
	table.index thead th[scope="row"] {
		text-align: right;
	}

	table.data  tbody th:first-child,
	table.index tbody th:first-child  {
		text-align: right;
	}

Possible extra rowspan handling

	table.data  tbody th[rowspan]:not([rowspan='1']),
	table.index tbody th[rowspan]:not([rowspan='1']),
	table.data  tbody td[rowspan]:not([rowspan='1']),
	table.index tbody td[rowspan]:not([rowspan='1']) {
		border-left: 1px solid silver;
	}

	table.data  tbody th[rowspan]:first-child,
	table.index tbody th[rowspan]:first-child,
	table.data  tbody td[rowspan]:first-child,
	table.index tbody td[rowspan]:first-child{
		border-left: 0;
		border-right: 1px solid silver;
	}
*/

/******************************************************************************/
/*                                  Indices                                   */
/******************************************************************************/


/** Table of Contents *********************************************************/

	.toc a {
		/* More spacing; use padding to make it part of the click target. */
		padding: 0.1rem 1px 0;
		/* Larger, more consistently-sized click target */
		display: block;
		/* Switch to using border-bottom for underlines */
		text-decoration: none;
		border-bottom: 1px solid;
		/* Reverse color scheme */
		color: black;
		color: var(--toclink-text);
		border-color: #3980b5;
		border-color: var(--toclink-underline);
	}
	.toc a:visited {
		color: black;
		color: var(--toclink-visited-text);
		border-color: #054572;
		border-color: var(--toclink-visited-underline);
	}
	.toc a:focus,
	.toc a:hover {
		background: rgba(75%, 75%, 75%, .25);
		background: var(--a-hover-bg);
		border-bottom-width: 3px;
		margin-bottom: -2px;
	}
	.toc a:not(:focus):not(:hover) {
		/* Allow colors to cascade through from link styling */
		border-bottom-color: transparent;
	}

	.toc, .toc ol, .toc ul, .toc li {
		list-style: none; /* Numbers must be inlined into source */
		/* because generated content isn't search/selectable and markers can't do multilevel yet */
		margin:  0;
		padding: 0;
	}
	.toc {
		line-height: 1.1em;
	}

	/* ToC not indented until third level, but font style & margins show hierarchy */
	.toc > li			{ font-weight: bold;   }
	.toc > li li		 { font-weight: normal; }
	.toc > li li li	  { font-size:   95%;	}
	.toc > li li li li	{ font-size:   90%;	}
	.toc > li li li li li { font-size:   85%;	}

	/* @supports not (display:grid) { */
		.toc > li			{ margin: 1.5rem 0;	}
		.toc > li li		 { margin: 0.3rem 0;	}
		.toc > li li li	  { margin-left: 2rem;   }

		/* Section numbers in a column of their own */
		.toc .secno {
			float: left;
			width: 4rem;
			white-space: nowrap;
		}
		.toc > li li li li .secno { font-size: 85%; }
		.toc > li li li li li .secno { font-size: 100%; }

		.toc li {
			clear: both;
		}

		:not(li) > .toc			 { margin-left:  5rem; }
		.toc .secno				 { margin-left: -5rem; }
		.toc > li li li .secno	  { margin-left: -7rem; }
		.toc > li li li li .secno	{ margin-left: -9rem; }
		.toc > li li li li li .secno { margin-left: -11rem; }

		/* Tighten up indentation in narrow ToCs */
		@media (max-width: 30em) {
			:not(li) > .toc			 { margin-left:  4rem; }
			.toc .secno				 { margin-left: -4rem; }
			.toc > li li li			 { margin-left:  1rem; }
			.toc > li li li .secno	  { margin-left: -5rem; }
			.toc > li li li li .secno	{ margin-left: -6rem; }
			.toc > li li li li li .secno { margin-left: -7rem; }
		}
		/* Loosen it on wide screens */
		@media screen and (min-width: 78em) {
			body:not(.toc-inline) :not(li) > .toc			 { margin-left:  4rem; }
			body:not(.toc-inline) .toc .secno				 { margin-left: -4rem; }
			body:not(.toc-inline) .toc > li li li			 { margin-left:  1rem; }
			body:not(.toc-inline) .toc > li li li .secno	  { margin-left: -5rem; }
			body:not(.toc-inline) .toc > li li li li .secno	{ margin-left: -6rem; }
			body:not(.toc-inline) .toc > li li li li li .secno { margin-left: -7rem; }
	}
	/* } */

	@supports (display:grid) and (display:contents) {
		/* Use #toc over .toc to override non-@supports rules. */
		#toc {
			display: grid;
			align-content: start;
			grid-template-columns: auto 1fr;
			grid-column-gap: 1rem;
			column-gap: 1rem;
			grid-row-gap: .6rem;
			row-gap: .6rem;
		}
		#toc h2 {
			grid-column: 1 / -1;
			margin-bottom: 0;
		}
		#toc ol,
		#toc li,
		#toc a {
			display: contents;
			/* Switch <a> to subgrid when supported */
		}
		#toc span {
			margin: 0;
		}
		#toc > .toc > li > a > span {
			/* The spans of the top-level list,
			  comprising the first items of each top-level section. */
			margin-top: 1.1rem;
		}
		#toc#toc .secno { /* Ugh, need more specificity to override base.css */
			grid-column: 1;
			width: auto;
			margin-left: 0;
		}
		#toc .content {
			grid-column: 2;
			width: auto;
			margin-right: 1rem;
			border-bottom: 3px solid transparent;
			margin-bottom: -3px;
		}
		#toc .content:hover,
		#toc .content:focus {
			background: rgba(75%, 75%, 75%, .25);
			background: var(--a-hover-bg);
			border-bottom-color: #054572;
			border-bottom-color: var(--toclink-underline);
		}
		#toc li li li .content {
			margin-left: 1rem;
		}
		#toc li li li li .content {
			margin-left: 2rem;
		}
	}


/** Index *********************************************************************/

	/* Index Lists: Layout */
	ul.index	  { margin-left: 0; columns: 15em; text-indent: 1em hanging; }
	ul.index li	{ margin-left: 0; list-style: none; break-inside: avoid; }
	ul.index li li { margin-left: 1em; }
	ul.index dl	{ margin-top: 0; }
	ul.index dt	{ margin: .2em 0 .2em 20px;}
	ul.index dd	{ margin: .2em 0 .2em 40px;}
	/* Index Lists: Typography */
	ul.index ul,
	ul.index dl { font-size: smaller; }
	@media not print {
		ul.index li a + span {
			white-space: nowrap;
			color: transparent; }
		ul.index li a:hover + span,
		ul.index li a:focus + span {
			color: #707070;
			color: var(--indexinfo-text);
		}
	}

/** Index Tables *****************************************************/
	/* See also the data table styling section, which this effectively subclasses */

	table.index {
		font-size: small;
		border-collapse: collapse;
		border-spacing: 0;
		text-align: left;
		margin: 1em 0;
	}

	table.index td,
	table.index th {
		padding: 0.4em;
	}

	table.index tr:hover td:not([rowspan]),
	table.index tr:hover th:not([rowspan]) {
		color: black;
		color: var(--indextable-hover-text);
		background: #f7f8f9;
		background: var(--indextable-hover-bg);
	}

	/* The link in the first column in the property table (formerly a TD) */
	table.index th:first-child a {
		font-weight: bold;
	}

/** Outdated warning **********************************************************/

.outdated-spec {
	color: black;
	color: var(--outdatedspec-text);
	background-color: rgba(0,0,0,0.5);
	background-color: var(--outdatedspec-bg);
}

.outdated-warning {
	position: fixed;
	bottom: 50%;
	left: 0;
	right: 0;
	margin: 0 auto;
	width: 50%;
	background: maroon;
	background: var(--outdated-bg);
	color: white;
	color: var(--outdated-text);
	border-radius: 1em;
	box-shadow: 0 0 1em red;
	box-shadow: 0 0 1em var(--outdated-shadow);
	padding: 2em;
	text-align: center;
	z-index: 2;
}

.outdated-warning a {
	color: currentcolor;
	background: transparent;
}

.edited-rec-warning {
	background: darkorange;
	background: var(--editedrec-bg);
	box-shadow: 0 0 1em;
}

.outdated-warning button {
	color: var(--outdated-text);
	border-radius: 1em;
	box-shadow: 0 0 1em red;
	box-shadow: 0 0 1em var(--outdated-shadow);
	padding: 2em;
	text-align: center;
	z-index: 2;
}

.outdated-warning a {
	color: currentcolor;
	background: transparent;
}

.edited-rec-warning {
	background: darkorange;
	background: var(--editedrec-bg);
	box-shadow: 0 0 1em;
}

.outdated-warning button {
	position: absolute;
	top: 0;
	right:0;
	margin: 0;
	border: 0;
	padding: 0.25em 0.5em;
	background: transparent;
	color: white;
	color: var(--outdated-text);
	font:1em sans-serif;
	text-align:center;
}

.outdated-warning span {
	display: block;
}

.outdated-collapsed {
	bottom: 0;
	border-radius: 0;
	width: 100%;
	padding: 0;
}

/******************************************************************************/
/*                                    Print                                   */
/******************************************************************************/

	@media print {
		/* Pages have their own margins. */
		html {
			margin: 0;
		}
		/* Serif for print. */
		body {
			font-family: serif;
		}

		.outdated-warning {
			position: absolute;
			border-style: solid;
			border-color: red;
		}

		.outdated-warning input {
			display: none;
		}
	}
	@page {
		margin: 1.5cm 1.1cm;
	}



/******************************************************************************/
/*                             Overflow Control                               */
/******************************************************************************/

	.figure .caption, .sidefigure .caption, figcaption {
		/* in case figure is overlarge, limit caption to 50em */
		max-width: 50rem;
		margin-left: auto;
		margin-right: auto;
	}
	.overlarge {
		/* Magic to create good item positioning:
		  "content column" is 50ems wide at max; less on smaller screens.
		  Extra space (after ToC + content) is empty on the right.

		  1. When item < content column, centers item in column.
		  2. When content < item < available, left-aligns.
		  3. When item > available, fills available + scroll bar.
		*/
		display: grid;
		grid-template-columns: minmax(0, 50em);
	}
	.overlarge > table {
		/* limit preferred width of table */
		max-width: 50em;
		margin-left: auto;
		margin-right: auto;
	}

	@media (min-width: 55em) {
		.overlarge {
			margin-right: calc(13px + 26.5rem - 50vw);
			max-width: none;
		}
	}
	@media screen and (min-width: 78em) {
		body:not(.toc-inline) .overlarge {
			/* 30.5em body padding 50em content area */
			margin-right: calc(40em - 50vw) !important;
		}
	}
	@media screen and (min-width: 90em) {
		body:not(.toc-inline) .overlarge {
			/* 4em html margin 30.5em body padding 50em content area */
			margin-right: calc(84.5em - 100vw) !important;
		}
	}

	@media not print {
		.overlarge {
			overflow-x: auto;
			/* See Lea Verou's explanation background-attachment:
			* http://lea.verou.me/2012/04/background-attachment-local/
			*
			background: top left  / 4em 100% linear-gradient(to right,  #ffffff, rgba(255, 255, 255, 0)) local,
						top right / 4em 100% linear-gradient(to left, #ffffff, rgba(255, 255, 255, 0)) local,
						top left  / 1em 100% linear-gradient(to right,  #c3c3c5, rgba(195, 195, 197, 0)) scroll,
						top right / 1em 100% linear-gradient(to left, #c3c3c5, rgba(195, 195, 197, 0)) scroll,
						white;
			background-repeat: no-repeat;
			*/
		}
	}
</style>
<style>
    table, th, td {
      border: 1px solid black;
      border-collapse: collapse;
      vertical-align: top;
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    th, td {
      border-left: none;
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      padding: 0px 10px;
    }
    th {
      text-align: center;
    }

    del { background: #fcc; color: #000; text-decoration: line-through; }
    ins { background: #cfc; color: #000; }
    blockquote .highlight:not(.idl) { background: initial; margin: initial; padding: 0.5em }
    blockquote ul { background: inherit; }
    blockquote code.highlight:not(.idl) { padding: initial; }
    blockquote c-[a] { color: inherit; } /* Keyword.Declaration */
    blockquote c-[b] { color: inherit; } /* Keyword.Type */
    blockquote c-[c] { color: inherit; } /* Comment */
    blockquote c-[d] { color: inherit; } /* Comment.Multiline */
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    blockquote c-[m] { color: inherit; } /* Literal.Number */
    blockquote c-[n] { color: inherit; } /* Name */
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    blockquote c-[t] { color: inherit; } /* Literal.String.Single */
    blockquote c-[u] { color: inherit; } /* Literal.String.Double */
    blockquote c-[cp] { color: inherit; } /* Comment.Preproc */
    blockquote c-[c1] { color: inherit; } /* Comment.Single */
    blockquote c-[cs] { color: inherit; } /* Comment.Special */
    blockquote c-[kc] { color: inherit; } /* Keyword.Constant */
    blockquote c-[kn] { color: inherit; } /* Keyword.Namespace */
    blockquote c-[kp] { color: inherit; } /* Keyword.Pseudo */
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    blockquote c-[ni] { color: inherit; } /* Name.Entity */
    blockquote c-[ne] { color: inherit; } /* Name.Exception */
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    blockquote c-[mf] { color: inherit; } /* Literal.Number.Float */
    blockquote c-[mh] { color: inherit; } /* Literal.Number.Hex */
    blockquote c-[mi] { color: inherit; } /* Literal.Number.Integer */
    blockquote c-[mo] { color: inherit; } /* Literal.Number.Oct */
    blockquote c-[sb] { color: inherit; } /* Literal.String.Backtick */
    blockquote c-[sc] { color: inherit; } /* Literal.String.Char */
    blockquote c-[sd] { color: inherit; } /* Literal.String.Doc */
    blockquote c-[se] { color: inherit; } /* Literal.String.Escape */
    blockquote c-[sh] { color: inherit; } /* Literal.String.Heredoc */
    blockquote c-[si] { color: inherit; } /* Literal.String.Interpol */
    blockquote c-[sx] { color: inherit; } /* Literal.String.Other */
    blockquote c-[sr] { color: inherit; } /* Literal.String.Regex */
    blockquote c-[ss] { color: inherit; } /* Literal.String.Symbol */
    blockquote c-[vc] { color: inherit; } /* Name.Variable.Class */
    blockquote c-[vg] { color: inherit; } /* Name.Variable.Global */
    blockquote c-[vi] { color: inherit; } /* Name.Variable.Instance */
    blockquote c-[il] { color: inherit; } /* Literal.Number.Integer.Long */
  </style>
  <meta content="Bikeshed version 74068a90b, updated Wed Mar 22 17:34:51 2023 -0700" name="generator">
  <link href="http://wg21.link/P3441R2" rel="canonical">
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<style>
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  <div class="head">
   <p data-fill-with="logo"></p>
   <h1 class="p-name no-ref" id="title">P3441R2<br>Rename <code class="highlight"><c- n>simd_split</c-></code> to <code class="highlight"><c- n>simd_chunk</c-></code></h1>
   <h2 class="no-num no-toc no-ref heading settled" id="profile-and-date"><span class="content">Published Proposal, <time class="dt-updated" datetime="2025-01-30">2025-01-30</time></span></h2>
   <div data-fill-with="spec-metadata">
    <dl>
     <dt>This version:
     <dd><a class="u-url" href="http://wg21.link/P3441R2">http://wg21.link/P3441R2</a>
     <dt class="editor">Authors:
     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:daniel.towner@intel.com">Daniel Towner</a> (<span class="p-org org">Intel</span>)
     <dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:ruslan.arutyunyan@intel.com">Ruslan Arutyunyan</a> (<span class="p-org org">Intel</span>)
     <dt>Audience:
     <dd>LEWG
     <dt>Project:
     <dd>ISO/IEC 14882 Programming Languages — C++, ISO/IEC JTC1/SC22/WG21
    </dl>
   </div>
   <div data-fill-with="warning"></div>
   <hr title="Separator for header">
  </div>
  <div class="p-summary" data-fill-with="abstract">
   <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
   <p>The behaviour of <code class="highlight"><c- n>simd_split</c-></code> is inconsistent with <code class="highlight"><c- n>ranges</c-><c- o>::</c-><c- n>views</c-><c- o>::</c-><c- n>split</c-></code>, but is consistent with the behaviour of <code class="highlight"><c- n>ranges</c-><c- o>::</c-><c- n>views</c-><c- o>::</c-><c- n>chunk</c-></code>. We propose to rename <code class="highlight"><c- n>simd_split</c-></code> to <code class="highlight"><c- n>simd_chunk</c-></code> to reflect this similarity in behaviour. We also propose that new overloads of <code class="highlight"><c- n>simd_chunk</c-></code> which take an integer parameter are provided as a convenience for a common use case.</p>
  </div>
  <nav data-fill-with="table-of-contents" id="toc">
   <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
   <ol class="toc" role="directory">
    <li><a href="#revision_history"><span class="secno">1</span> <span class="content">Revision History</span></a>
    <li><a href="#intro"><span class="secno">2</span> <span class="content">Motivation</span></a>
    <li><a href="#impl_experience"><span class="secno">3</span> <span class="content">Implementation experience</span></a>
    <li>
     <a href="#wording"><span class="secno">4</span> <span class="content">Wording</span></a>
     <ol class="toc">
      <li><a href="#wording_simd_syn"><span class="secno">4.1</span> <span class="content">Modify [<span><strong>simd.syn</strong></span>]</span></a>
      <li><a href="#wording_simd_creation"><span class="secno">4.2</span> <span class="content">Modify [<span><strong>simd.creation</strong></span>]</span></a>
     </ol>
   </ol>
  </nav>
  <main>
   <h2 class="heading settled" data-level="1" id="revision_history"><span class="secno">1. </span><span class="content">Revision History</span><a class="self-link" href="#revision_history"></a></h2>
   <p>R1 => R2</p>
   <ul>
    <li data-md>
     <p>Improved examples</p>
    <li data-md>
     <p>Added more background to naming choice and motivation provide an integer overloads.</p>
    <li data-md>
     <p>Added implementation experience</p>
    <li data-md>
     <p>Improved wording to fix some errors and to provide more context for required changes.</p>
    <li data-md>
     <p>Added revision history</p>
   </ul>
   <p>R0 => R1</p>
   <ul>
    <li data-md>
     <p>Renamed <code class="highlight"><c- n>simd_chunk_n</c-></code> to <code class="highlight"><c- n>simd_chunk</c-></code>.</p>
    <li data-md>
     <p>Wording changes to separate each overload to have its own clauses.</p>
   </ul>
   <h2 class="heading settled" data-level="2" id="intro"><span class="secno">2. </span><span class="content">Motivation</span><a class="self-link" href="#intro"></a></h2>
   <p>The <code class="highlight"><c- n>simd_split</c-><c- o>&lt;</c-><c- n>T</c-><c- o>></c-></code> function takes a <code class="highlight"><c- n>basic_simd</c-></code> object and breaks it down into
a tuple of as many objects of type <code class="highlight"><c- n>T</c-></code> that it can, and maybe one remainder
object. An example illustrates a practical use of this, where a large <code class="highlight"><c- n>basic_simd</c-></code> value is broken into many smaller pieces, each of which fits a specific hardware
register type (possibly with a hardware-specific abi):</p>
<pre class="language-cpp highlight"><c- k>using</c-> <c- n>Avx2RegisterType</c-> <c- o>=</c-> <c- n>simd</c-><c- o>&lt;</c-><c- b>float</c-><c- p>,</c-> <c- mi>8</c-><c- o>></c-><c- p>;</c-> <c- c1>// Or with a hardware ABI instead.</c->

<c- n>simd</c-><c- o>&lt;</c-><c- b>float</c-><c- p>,</c-> <c- mi>19</c-><c- o>></c-> <c- n>x</c-><c- p>;</c->
<c- k>auto</c-> <c- n>t</c-> <c- o>=</c-> <c- n>simd_split</c-><c- o>&lt;</c-><c- n>Avx2RegisterType</c-><c- o>></c-><c- p>(</c-><c- n>x</c-><c- p>);</c->
<c- c1>// get&lt;0>(t) will be of type simd&lt;float, 8></c->
<c- c1>// get&lt;1>(t) will be of type simd&lt;float, 8></c->
<c- c1>// get&lt;2>(t) will be of type simd&lt;float, 3> - the remainder</c->

<c- c1>// Note that each element is now the right size to pass to an AVX2 intrinsic.</c-></pre>
   <p>If the original type is perfectly divisible into type <code class="highlight"><c- n>T</c-></code> then an <code class="highlight"><c- n>array</c-><c- o>&lt;</c-><c- n>T</c-><c- o>></c-></code> is
returned instead of a tuple of different sized <code class="highlight"><c- n>basic_simd</c-></code> objects.</p>
   <p>The behaviour of <code class="highlight"><c- n>simd_split</c-></code> is virtually identical to that of <code class="highlight"><c- n>ranges</c-><c- o>::</c-><c- n>views</c-><c- o>::</c-><c- n>chunk</c-></code> and <code class="highlight"><c- n>ranges</c-><c- o>::</c-><c- n>chunk_view</c-></code>. They take a view and
a number n and produce a range of views (the chunks) of the original view, such
that each chunk, except maybe the last one, has the size n.</p>
   <p>In contrast, <code class="highlight"><c- n>ranges</c-><c- o>::</c-><c- n>views</c-><c- o>::</c-><c- n>split</c-></code> has a different behaviour to the similarly
named <code class="highlight"><c- n>simd_split</c-></code>. The ranges version of <code class="highlight"><c- n>split</c-></code> takes an input range and a
delimiter value, and generates a range of views split on the delimiter. For
example, the string "This,is,a,list", when split by the comma value would
generate a range containing 4 views: "This", "is", "a", "list".</p>
   <p>We propose that the <code class="highlight"><c- n>simd_split</c-></code> function is renamed to <code class="highlight"><c- n>simd_chunk</c-></code> to make its
behavior consistant with the existing range/view counterparts. We did not
consider any alternative names since they would introduce yet another name for a
behavior that already exists and the intent is to allow the behavior of the
existing term <i>chunk</i> to be reused in the context of <code class="highlight"><c- n>simd</c-></code>.</p>
   <p>A common use case for <code class="highlight"><c- n>simd_split</c-></code>/<code class="highlight"><c- n>simd_chunk</c-></code> is to break a larger <code class="highlight"><c- n>basic_simd</c-></code> object into smaller native-sized pieces to call target-specific
intrinsics, as illustrated in the first example in this paper. For that use-case
the behaviour of <code class="highlight"><c- n>simd_chunk</c-></code> is sufficient, but another common use case is
where an algorithm requires that a <code class="highlight"><c- n>basic_simd</c-></code> be broken down into pieces of a
particular size. Only the size is of interest, not other details such as the
ABI. With the current behavior the user would have to store the size inside a
special type created just for that purpose, but it would be more convenient to
provide overloads which take the size directly. The difference is illustrated
here:</p>
   <table>
    <tbody>
     <tr>
      <th>As existing
      <th>With new overloads
     <tr>
      <th>
<pre class="language-cpp highlight"><c- k>constexpr</c-> <c- b>int</c-> <c- n>ChunkSize</c-> <c- o>=</c-> <c- p>...;</c->
<c- n>simd</c-><c- o>&lt;</c-><c- b>float</c-><c- p>,</c-> <c- mi>19</c-><c- o>></c-> <c- n>x</c-><c- p>;</c->

<c- c1>// Create a simd type purely as a vehicle to</c->
<c- c1>// to pass around `ChunkSize`.</c->
<c- k>using</c-> <c- n>ChunkType</c-> <c- o>=</c->
  <c- n>resize_simd_t</c-><c- o>&lt;</c-><c- n>ChunkSize</c-><c- p>,</c-> <c- n>simd</c-><c- o>&lt;</c-><c- b>float</c-><c- p>,</c-> <c- mi>19</c-><c- o>>></c-><c- p>;</c->

<c- k>auto</c-> <c- n>t</c-> <c- o>=</c-> <c- n>simd_chunk</c-><c- o>&lt;</c-><c- n>ChunkType</c-><c- o>></c-><c- p>(</c-><c- n>x</c-><c- p>);</c-></pre>
      <th>
<pre class="language-cpp highlight"><c- k>constexpr</c-> <c- b>int</c-> <c- n>ChunkSize</c-> <c- o>=</c-> <c- p>...;</c->
<c- n>simd</c-><c- o>&lt;</c-><c- b>float</c-><c- p>,</c-> <c- mi>19</c-><c- o>></c-> <c- n>x</c-><c- p>;</c->

<c- c1>// Use the ChunkSize directly.</c->
<c- k>auto</c-> <c- n>t</c-> <c- o>=</c-> <c- n>simd_chunk</c-><c- o>&lt;</c-><c- n>ChunkSize</c-><c- o>></c-><c- p>(</c-><c- n>x</c-><c- p>);</c-></pre>
   </table>
   <p>The overloaded version allows the user to directly use the size without having
to convert to a chunk-type as a vehicle to convey the size indirectly. Allowing
the size to be used directly allows the code to be simpler and more obvious.</p>
   <h2 class="heading settled" data-level="3" id="impl_experience"><span class="secno">3. </span><span class="content">Implementation experience</span><a class="self-link" href="#impl_experience"></a></h2>
   <p>The rename made no difference to the implementation, but does make the intent of
those functions more obvious to those already familiar with the uses of the
words "split" and "chunk" within the ranges libraries.</p>
   <p>The extra overloads make places where chunking is performed for algorithmic
reasons (rather than hardware-related type reasons) more obvious and readable.
There is no need for the user’s code to introduce new sized-types for chunking.</p>
   <p>The implementation of the new overloads is trivial and was done for Intel internal implementation of <code class="highlight"><c- n>std</c-><c- o>::</c-><c- n>simd</c-></code>.
The overloads can do as the examples above illustrate, and convert the incoming type to a new size and call
the existing <code class="highlight"><c- n>basic_simd</c-></code> overloads.</p>
   <h2 class="heading settled" data-level="4" id="wording"><span class="secno">4. </span><span class="content">Wording</span><a class="self-link" href="#wording"></a></h2>
   <p>The wording diff is against the current C++ working draft.</p>
   <h3 class="heading settled" data-level="4.1" id="wording_simd_syn"><span class="secno">4.1. </span><span class="content">Modify [<a href="https://eel.is/c++draft/simd.syn"><strong>simd.syn</strong></a>]</span><a class="self-link" href="#wording_simd_syn"></a></h3>
   <p>Add new <code class="highlight"><c- n>simd_chunk</c-></code> overloads immediately after the existing ones.</p>
   <blockquote>
<pre class="highlight"><c- k>template</c-><c- o>&lt;</c-><c- k>class</c-> <c- nc>T</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- p>,</c-> <c- n>contiguous_iterator</c-> <c- n>I</c-><c- p>,</c-> <c- n>sized_sentinel_for</c-><c- o>&lt;</c-><c- n>I</c-><c- o>></c-> <c- n>S</c-><c- p>,</c-> <c- k>class</c-><c- p>...</c-> <c- n>Flags</c-><c- o>></c->
  <c- k>requires</c-> <c- n>indirectly_writable</c-><c- o>&lt;</c-><c- n>I</c-><c- p>,</c-> <c- n>T</c-><c- o>></c->
  <c- k>constexpr</c-> <c- b>void</c-> <c- n>simd_partial_store</c-><c- p>(</c-><c- k>const</c-> <c- n>basic_simd</c-><c- o>&lt;</c-><c- n>T</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>v</c-><c- p>,</c-> <c- n>I</c-> <c- n>first</c-><c- p>,</c-> <c- n>S</c-> <c- n>last</c-><c- p>,</c->
    <c- n>simd_flags</c-><c- o>&lt;</c-><c- n>Flags</c-><c- p>...</c-><c- o>></c-> <c- n>f</c-> <c- o>=</c-> <c- p>{});</c->
<c- k>template</c-><c- o>&lt;</c-><c- k>class</c-> <c- nc>T</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- p>,</c-> <c- n>contiguous_iterator</c-> <c- n>I</c-><c- p>,</c-> <c- n>sized_sentinel_for</c-><c- o>&lt;</c-><c- n>I</c-><c- o>></c-> <c- n>S</c-><c- p>,</c-> <c- k>class</c-><c- p>...</c-> <c- n>Flags</c-><c- o>></c->
  <c- k>requires</c-> <c- n>indirectly_writable</c-><c- o>&lt;</c-><c- n>I</c-><c- p>,</c-> <c- n>T</c-><c- o>></c->
  <c- k>constexpr</c-> <c- b>void</c-> <c- n>simd_partial_store</c-><c- p>(</c-><c- k>const</c-> <c- n>basic_simd</c-><c- o>&lt;</c-><c- n>T</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>v</c-><c- p>,</c-> <c- n>I</c-> <c- n>first</c-><c- p>,</c-> <c- n>S</c-> <c- n>last</c-><c- p>,</c->
    <c- k>const</c-> <c- k>typename</c-> <c- nc>basic_simd</c-><c- o>&lt;</c-><c- n>T</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>::</c-><c- n>mask_type</c-><c- o>&amp;</c-> <c- n>mask</c-><c- p>,</c-> <c- n>simd_flags</c-><c- o>&lt;</c-><c- n>Flags</c-><c- p>...</c-><c- o>></c-> <c- n>f</c-> <c- o>=</c-> <c- p>{});</c->

<c- c1>// </c-><i><c- c1>[simd.creation]</c-></i><c- c1>, basic_simd and basic_simd_mask creation</c->
<c- k>template</c-><c- o>&lt;</c-><c- k>class</c-> <c- nc>V</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c->
    <del><c- n>simd_split</c-></del> <ins><c- n>simd_chunk</c-></ins><c- p>(</c-><c- k>const</c-> <c- n>basic_simd</c-><c- o>&lt;</c-><c- k>typename</c-> <c- nc>V</c-><c- o>::</c-><c- n>value_type</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c->
<c- k>template</c-><c- o>&lt;</c-><c- k>class</c-> <c- nc>M</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c->
    <del><c- n>simd_split</c-></del> <ins><c- n>simd_chunk</c-></ins><c- p>(</c-><c- k>const</c-> <c- n>basic_simd_mask</c-><c- o>&lt;</c-><c- n>mask</c-><c- o>-</c-><c- n>element</c-><c- o>-</c-><c- n>size</c-><c- o>&lt;</c-><c- n>M</c-><c- o>></c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c->
<ins>
<c- k>template</c-><c- o>&lt;</c-><c- b>size_t</c-> <c- n>N</c-><c- p>,</c-> <c- k>class</c-> <c- nc>T</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c->
    <c- n>simd_chunk</c-><c- p>(</c-><c- k>const</c-> <c- n>basic_simd</c-><c- o>&lt;</c-><c- n>T</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c->
<c- k>template</c-><c- o>&lt;</c-><c- b>size_t</c-> <c- n>N</c-><c- p>,</c-> <c- b>size_t</c-> <c- n>Bytes</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c->
    <c- n>simd_chunk</c-><c- p>(</c-><c- k>const</c-> <c- n>basic_simd_mask</c-><c- o>&lt;</c-><c- n>Bytes</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c-></ins></pre>
   </blockquote>
   <h3 class="heading settled" data-level="4.2" id="wording_simd_creation"><span class="secno">4.2. </span><span class="content">Modify [<a href="https://eel.is/c++draft/simd.creation"><strong>simd.creation</strong></a>]</span><a class="self-link" href="#wording_simd_creation"></a></h3>
   <blockquote>
<pre class="wordingStyle highlight"><c- k>template</c-><c- o>&lt;</c-><c- k>class</c-> <c- nc>T</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c-> <del><c- n>simd_split</c-></del> <ins><c- n>simd_chunk</c-></ins><c- p>(</c-><c- k>const</c-> <c- n>basic_simd</c-><c- o>&lt;</c-><c- k>typename</c-> <c- nc>T</c-><c- o>::</c-><c- n>value_type</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c->
<c- k>template</c-><c- o>&lt;</c-><c- k>class</c-> <c- nc>T</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c-> <del><c- n>simd_split</c-></del> <ins><c- n>simd_chunk</c-></ins><c- p>(</c-><c- k>const</c-> <c- n>basic_simd_mask</c-><c- o>&lt;</c-><c- n>mask</c-><c- o>-</c-><c- n>element</c-><c- o>-</c-><c- n>size</c-><c- o>&lt;</c-><c- n>T</c-><c- o>></c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c-></pre>
    <p><i>Constraints</i>:</p>
    <ul>
     <li data-md>
      <p>For the first overload <code class="highlight"><c- n>T</c-></code> is an enabled specialization of <code class="highlight"><c- n>basic_simd</c-></code>. If <code class="highlight"><c- n>basic_simd</c-><c- o>&lt;</c->​<c- k>typename</c-> <c- nc>T</c->​<c- o>::</c->​​<c- n>value_type</c-><c- p>,</c-> <c- n>Abi</c-><c- o>></c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-> <c- o>%</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-></code> is not <code class="highlight"><c- mi>0</c-></code> then <code class="highlight"><c- n>resize_simd_t</c-><c- o>&lt;</c-><c- n>basic_simd</c-><c- o>&lt;</c->​<c- k>typename</c-> <c- nc>T</c->​<c- o>::</c->​​<c- n>value_type</c-><c- p>,</c-> <c- n>Abi</c-><c- o>></c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-> <c- o>%</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>(),</c-> <c- n>T</c-><c- o>></c-></code> is valid and denotes a type.</p>
     <li data-md>
      <p>For the second overload <code class="highlight"><c- n>T</c-></code> is an enabled specialization of <code class="highlight"><c- n>basic_simd_mask</c-></code>. If <code class="highlight"><c- n>basic_simd_mask</c-><c- o>&lt;</c-><i><c- n>mask</c-><c- o>-</c-><c- n>element</c-><c- o>-</c-><c- n>size</c-></i><c- o>&lt;</c-><c- n>T</c-><c- o>></c-><c- p>,</c-> <c- n>Abi</c-><c- o>></c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-> <c- o>%</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-></code> is not <code class="highlight"><c- mi>0</c-></code> then <code class="highlight"><c- n>resize_simd_t</c-><c- o>&lt;</c->​<c- n>basic_simd_mask</c-><c- o>&lt;</c-><i>​<c- n>mask</c-><c- o>-</c-><c- n>element</c-><c- o>-</c-><c- n>size</c-></i><c- o>&lt;</c-><c- n>T</c-><c- o>></c-><c- p>,</c-> <c- n>Abi</c-><c- o>></c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-> <c- o>%</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>(),</c-> <c- n>T</c-><c- o>></c-></code> is valid
and denotes a type.</p>
    </ul>
    <p>Let <code class="highlight"><i><c- n>N</c-></i></code> be <code class="highlight"><c- n>x</c-><c- p>.</c-><c- n>size</c-><c- p>()</c-> <c- o>/</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-></code>.</p>
    <p><i>Returns</i>:</p>
    <ul>
     <li data-md>
      <p>If <code class="highlight"><c- n>x</c-><c- p>.</c-><c- n>size</c-><c- p>()</c-> <c- o>%</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-> <c- o>==</c-> <c- mi>0</c-></code> is <code class="highlight">true</code>, an <code class="highlight"><c- n>array</c-><c- o>&lt;</c-><c- n>T</c-><c- p>,</c-> <i><c- n>N</c-></i><c- o>></c-></code> with the <code class="highlight"><i><c- n>i</c-></i></code><sup>th</sup> <code class="highlight"><c- n>basic_simd</c-></code> or <code class="highlight"><c- n>basic_simd_mask</c-></code> element of the <code class="highlight"><i><c- n>j</c-></i></code><sup>th</sup> array element initialized to the
value of the element in <code class="highlight"><c- n>x</c-></code> with index <code class="highlight"><i><c- n>i</c-></i> <c- o>+</c-> <i><c- n>j</c-></i> <c- o>*</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-></code>.</p>
     <li data-md>
      <p>Otherwise, a <code class="highlight"><c- n>tuple</c-></code> of <code class="highlight"><i><c- n>N</c-></i></code> objects of type <code class="highlight"><c- n>T</c-></code> and one object of type <code class="highlight"><c- n>resize_simd_t</c-><c- o>&lt;</c-><c- n>x</c-><c- p>.</c-><c- n>size</c-><c- p>()</c-> <c- o>%</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>(),</c-> <c- n>T</c-><c- o>></c-></code>. The <code class="highlight"><i><c- n>i</c-></i></code><sup>th</sup> <code class="highlight"><c- n>basic_simd</c-></code> or <code class="highlight"><c- n>basic_simd_mask</c-></code> element of the <code class="highlight"><i><c- n>j</c-></i></code><sup>th</sup> <code class="highlight"><c- n>tuple</c-></code> element of type <code class="highlight"><c- n>T</c-></code> is initialized to the value of the element
in <code class="highlight"><c- n>x</c-></code> with index <code class="highlight"><i><c- n>i</c-></i> <c- o>+</c-> <i><c- n>j</c-></i> <c- o>*</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-></code>. The <code class="highlight"><i><c- n>i</c-></i></code><sup>th</sup> <code class="highlight"><c- n>basic_simd</c-></code> or <code class="highlight"><c- n>basic_simd_mask</c-></code> element of the <code class="highlight"><i><c- n>N</c-></i></code><sup>th</sup> <code class="highlight"><c- n>tuple</c-></code> element is initialized to the value of the
element in <code class="highlight"><c- n>x</c-></code> with index <code class="highlight"><i><c- n>i</c-></i> <c- o>+</c-> <i><c- n>N</c-></i> <c- o>*</c-> <c- n>T</c->​<c- o>::</c->​<c- n>size</c-><c- p>()</c-></code>.</p>
    </ul>
    <ins>
<pre class="highlight"><c- k>template</c-><c- o>&lt;</c-><c- b>size_t</c-> <c- n>N</c-><c- p>,</c-> <c- k>class</c-> <c- nc>T</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c-> <c- n>simd_chunk</c-><c- p>(</c-><c- k>const</c-> <c- n>basic_simd</c-><c- o>&lt;</c-><c- n>T</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c-></pre>
     <p><i>Effects</i>: Equivalent to: <code class="highlight"><c- k>return</c-> <c- n>simd_chunk</c-><c- o>&lt;</c-><c- n>resize_simd_t</c-><c- o>&lt;</c-><c- n>N</c-><c- p>,</c-> <c- n>basic_simd</c-><c- o>&lt;</c-><c- n>T</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>>></c-><c- p>(</c-><c- n>x</c-><c- p>);</c-></code></p>
<pre class="highlight"><c- k>template</c-><c- o>&lt;</c-><c- b>size_t</c-> <c- n>N</c-><c- p>,</c-> <c- b>size_t</c-> <c- n>Bytes</c-><c- p>,</c-> <c- k>class</c-> <c- nc>Abi</c-><c- o>></c->
  <c- k>constexpr</c-> <c- k>auto</c-> <c- n>simd_chunk</c-><c- p>(</c-><c- k>const</c-> <c- n>basic_simd_mask</c-><c- o>&lt;</c-><c- n>Bytes</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>&amp;</c-> <c- n>x</c-><c- p>)</c-> <c- k>noexcept</c-><c- p>;</c-></pre>
     <p><i>Effects</i>: Equivalent to: <code class="highlight"><c- k>return</c-> <c- n>simd_chunk</c-><c- o>&lt;</c-><c- n>resize_simd_t</c-><c- o>&lt;</c-><c- n>N</c-><c- p>,</c-> <c- n>basic_simd_mask</c-><c- o>&lt;</c-><c- n>Bytes</c-><c- p>,</c-> <c- n>Abi</c-><c- o>>>></c-><c- p>(</c-><c- n>x</c-><c- p>);</c-></code></p>
    </ins>
   </blockquote>
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