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| <meta name="generator" content="Asciidoctor 1.5.7"> |
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| <title>The OpenCL™ C++ 1.0 Specification</title> |
| <style> |
| /*! normalize.css v2.1.2 | MIT License | git.io/normalize */ |
| /* ========================================================================== HTML5 display definitions ========================================================================== */ |
| /** Correct `block` display not defined in IE 8/9. */ |
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| /** Correct `inline-block` display not defined in IE 8/9. */ |
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| a:focus { outline: thin dotted; } |
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| button, input, select, textarea { font-family: inherit; /* 1 */ font-size: 100%; /* 2 */ margin: 0; /* 3 */ } |
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| /** Address Firefox 4+ setting `line-height` on `input` using `!important` in the UA stylesheet. */ |
| button, input { line-height: normal; } |
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| /** Address inconsistent `text-transform` inheritance for `button` and `select`. All other form control elements do not inherit `text-transform` values. Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+. Correct `select` style inheritance in Firefox 4+ and Opera. */ |
| button, select { text-transform: none; } |
| |
| /** 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls. 2. Correct inability to style clickable `input` types in iOS. 3. Improve usability and consistency of cursor style between image-type `input` and others. */ |
| button, html input[type="button"], input[type="reset"], input[type="submit"] { -webkit-appearance: button; /* 2 */ cursor: pointer; /* 3 */ } |
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| /** Re-set default cursor for disabled elements. */ |
| button[disabled], html input[disabled] { cursor: default; } |
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| input[type="checkbox"], input[type="radio"] { box-sizing: border-box; /* 1 */ padding: 0; /* 2 */ } |
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| /** Remove inner padding and search cancel button in Safari 5 and Chrome on OS X. */ |
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| /** Remove inner padding and border in Firefox 4+. */ |
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| /** 1. Remove default vertical scrollbar in IE 8/9. 2. Improve readability and alignment in all browsers. */ |
| textarea { overflow: auto; /* 1 */ vertical-align: top; /* 2 */ } |
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| /** Remove most spacing between table cells. */ |
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| |
| /* Default Link Styles */ |
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| a img { border: none; } |
| |
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| /* Helpful Typography Defaults */ |
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| strong, b { font-weight: bold; line-height: inherit; } |
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| |
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| ul.disc { list-style-type: disc; } |
| ul.no-bullet { list-style: none; } |
| |
| /* Ordered Lists */ |
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| |
| /* Definition Lists */ |
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| dl dd { margin-bottom: 0.75em; } |
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| /* Abbreviations */ |
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| |
| abbr { text-transform: none; } |
| |
| /* Blockquotes */ |
| blockquote { margin: 0 0 0.75em; padding: 0.5625em 1.25em 0 1.1875em; border-left: 1px solid #dddddd; } |
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| |
| blockquote, blockquote p { line-height: 1.6; color: #333333; } |
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| /* Microformats */ |
| .vcard { display: inline-block; margin: 0 0 1.25em 0; border: 1px solid #dddddd; padding: 0.625em 0.75em; } |
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| .vcard .fn { font-weight: bold; font-size: 0.9375em; } |
| |
| .vevent .summary { font-weight: bold; } |
| .vevent abbr { cursor: auto; text-decoration: none; font-weight: bold; border: none; padding: 0 0.0625em; } |
| |
| @media only screen and (min-width: 768px) { h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; } |
| h1 { font-size: 2.75em; } |
| h2 { font-size: 2.3125em; } |
| h3, #toctitle, .sidebarblock > .content > .title { font-size: 1.6875em; } |
| h4 { font-size: 1.4375em; } } |
| /* Tables */ |
| table { background: white; margin-bottom: 1.25em; border: solid 1px #d8d8ce; } |
| table thead, table tfoot { background: -webkit-linear-gradient(top, #add386, #90b66a); font-weight: bold; } |
| table thead tr th, table thead tr td, table tfoot tr th, table tfoot tr td { padding: 0.5em 0.625em 0.625em; font-size: inherit; color: white; text-align: left; } |
| table tr th, table tr td { padding: 0.5625em 0.625em; font-size: inherit; color: #6d6e71; } |
| table tr.even, table tr.alt, table tr:nth-of-type(even) { background: #edf2f2; } |
| table thead tr th, table tfoot tr th, table tbody tr td, table tr td, table tfoot tr td { display: table-cell; line-height: 1.4; } |
| |
| body { -moz-osx-font-smoothing: grayscale; -webkit-font-smoothing: antialiased; tab-size: 4; } |
| |
| h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { line-height: 1.4; } |
| |
| a:hover, a:focus { text-decoration: underline; } |
| |
| .clearfix:before, .clearfix:after, .float-group:before, .float-group:after { content: " "; display: table; } |
| .clearfix:after, .float-group:after { clear: both; } |
| |
| *:not(pre) > code { font-size: inherit; font-style: normal !important; letter-spacing: 0; padding: 0; background-color: white; -webkit-border-radius: 0; border-radius: 0; line-height: inherit; word-wrap: break-word; } |
| *:not(pre) > code.nobreak { word-wrap: normal; } |
| *:not(pre) > code.nowrap { white-space: nowrap; } |
| |
| pre, pre > code { line-height: 1.6; color: #264357; font-family: Consolas, "Liberation Mono", Courier, monospace; font-weight: normal; } |
| |
| em em { font-style: normal; } |
| |
| strong strong { font-weight: normal; } |
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| .keyseq { color: #333333; } |
| |
| kbd { font-family: Consolas, "Liberation Mono", Courier, monospace; display: inline-block; color: black; font-size: 0.65em; line-height: 1.45; background-color: #f7f7f7; border: 1px solid #ccc; -webkit-border-radius: 3px; border-radius: 3px; -webkit-box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 0 0 0 0.1em white inset; margin: 0 0.15em; padding: 0.2em 0.5em; vertical-align: middle; position: relative; top: -0.1em; white-space: nowrap; } |
| |
| .keyseq kbd:first-child { margin-left: 0; } |
| |
| .keyseq kbd:last-child { margin-right: 0; } |
| |
| .menuseq, .menuref { color: #000; } |
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| .menuseq b:not(.caret), .menuref { font-weight: inherit; } |
| |
| .menuseq { word-spacing: -0.02em; } |
| .menuseq b.caret { font-size: 1.25em; line-height: 0.8; } |
| .menuseq i.caret { font-weight: bold; text-align: center; width: 0.45em; } |
| |
| b.button:before, b.button:after { position: relative; top: -1px; font-weight: normal; } |
| |
| b.button:before { content: "["; padding: 0 3px 0 2px; } |
| |
| b.button:after { content: "]"; padding: 0 2px 0 3px; } |
| |
| #header, #content, #footnotes, #footer { width: 100%; margin-left: auto; margin-right: auto; margin-top: 0; margin-bottom: 0; max-width: 62.5em; *zoom: 1; position: relative; padding-left: 1.5em; padding-right: 1.5em; } |
| #header:before, #header:after, #content:before, #content:after, #footnotes:before, #footnotes:after, #footer:before, #footer:after { content: " "; display: table; } |
| #header:after, #content:after, #footnotes:after, #footer:after { clear: both; } |
| |
| #content { margin-top: 1.25em; } |
| |
| #content:before { content: none; } |
| |
| #header > h1:first-child { color: black; margin-top: 2.25rem; margin-bottom: 0; } |
| #header > h1:first-child + #toc { margin-top: 8px; border-top: 1px solid #dddddd; } |
| #header > h1:only-child, body.toc2 #header > h1:nth-last-child(2) { border-bottom: 1px solid #dddddd; padding-bottom: 8px; } |
| #header .details { border-bottom: 1px solid #dddddd; line-height: 1.45; padding-top: 0.25em; padding-bottom: 0.25em; padding-left: 0.25em; color: #5e93b8; display: -ms-flexbox; display: -webkit-flex; display: flex; -ms-flex-flow: row wrap; -webkit-flex-flow: row wrap; flex-flow: row wrap; } |
| #header .details span:first-child { margin-left: -0.125em; } |
| #header .details span.email a { color: #333333; } |
| #header .details br { display: none; } |
| #header .details br + span:before { content: "\00a0\2013\00a0"; } |
| #header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: #333333; } |
| #header .details br + span#revremark:before { content: "\00a0|\00a0"; } |
| #header #revnumber { text-transform: capitalize; } |
| #header #revnumber:after { content: "\00a0"; } |
| |
| #content > h1:first-child:not([class]) { color: black; border-bottom: 1px solid #dddddd; padding-bottom: 8px; margin-top: 0; padding-top: 1rem; margin-bottom: 1.25rem; } |
| |
| #toc { border-bottom: 0 solid #dddddd; padding-bottom: 0.5em; } |
| #toc > ul { margin-left: 0.125em; } |
| #toc ul.sectlevel0 > li > a { font-style: italic; } |
| #toc ul.sectlevel0 ul.sectlevel1 { margin: 0.5em 0; } |
| #toc ul { font-family: Noto, sans-serif; list-style-type: none; } |
| #toc li { line-height: 1.3334; margin-top: 0.3334em; } |
| #toc a { text-decoration: none; } |
| #toc a:active { text-decoration: underline; } |
| |
| #toctitle { color: black; font-size: 1.2em; } |
| |
| @media only screen and (min-width: 768px) { #toctitle { font-size: 1.375em; } |
| body.toc2 { padding-left: 15em; padding-right: 0; } |
| #toc.toc2 { margin-top: 0 !important; background-color: white; position: fixed; width: 15em; left: 0; top: 0; border-right: 1px solid #dddddd; border-top-width: 0 !important; border-bottom-width: 0 !important; z-index: 1000; padding: 1.25em 1em; height: 100%; overflow: auto; } |
| #toc.toc2 #toctitle { margin-top: 0; margin-bottom: 0.8rem; font-size: 1.2em; } |
| #toc.toc2 > ul { font-size: 0.9em; margin-bottom: 0; } |
| #toc.toc2 ul ul { margin-left: 0; padding-left: 1em; } |
| #toc.toc2 ul.sectlevel0 ul.sectlevel1 { padding-left: 0; margin-top: 0.5em; margin-bottom: 0.5em; } |
| body.toc2.toc-right { padding-left: 0; padding-right: 15em; } |
| body.toc2.toc-right #toc.toc2 { border-right-width: 0; border-left: 1px solid #dddddd; left: auto; right: 0; } } |
| @media only screen and (min-width: 1280px) { body.toc2 { padding-left: 20em; padding-right: 0; } |
| #toc.toc2 { width: 20em; } |
| #toc.toc2 #toctitle { font-size: 1.375em; } |
| #toc.toc2 > ul { font-size: 0.95em; } |
| #toc.toc2 ul ul { padding-left: 1.25em; } |
| body.toc2.toc-right { padding-left: 0; padding-right: 20em; } } |
| #content #toc { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; } |
| #content #toc > :first-child { margin-top: 0; } |
| #content #toc > :last-child { margin-bottom: 0; } |
| |
| #footer { max-width: 100%; background-color: none; padding: 1.25em; } |
| |
| #footer-text { color: black; line-height: 1.44; } |
| |
| #content { margin-bottom: 0.625em; } |
| |
| .sect1 { padding-bottom: 0.625em; } |
| |
| @media only screen and (min-width: 768px) { #content { margin-bottom: 1.25em; } |
| .sect1 { padding-bottom: 1.25em; } } |
| .sect1:last-child { padding-bottom: 0; } |
| |
| .sect1 + .sect1 { border-top: 0 solid #dddddd; } |
| |
| #content h1 > a.anchor, h2 > a.anchor, h3 > a.anchor, #toctitle > a.anchor, .sidebarblock > .content > .title > a.anchor, h4 > a.anchor, h5 > a.anchor, h6 > a.anchor { position: absolute; z-index: 1001; width: 1.5ex; margin-left: -1.5ex; display: block; text-decoration: none !important; visibility: hidden; text-align: center; font-weight: normal; } |
| #content h1 > a.anchor:before, h2 > a.anchor:before, h3 > a.anchor:before, #toctitle > a.anchor:before, .sidebarblock > .content > .title > a.anchor:before, h4 > a.anchor:before, h5 > a.anchor:before, h6 > a.anchor:before { content: "\00A7"; font-size: 0.85em; display: block; padding-top: 0.1em; } |
| #content h1:hover > a.anchor, #content h1 > a.anchor:hover, h2:hover > a.anchor, h2 > a.anchor:hover, h3:hover > a.anchor, #toctitle:hover > a.anchor, .sidebarblock > .content > .title:hover > a.anchor, h3 > a.anchor:hover, #toctitle > a.anchor:hover, .sidebarblock > .content > .title > a.anchor:hover, h4:hover > a.anchor, h4 > a.anchor:hover, h5:hover > a.anchor, h5 > a.anchor:hover, h6:hover > a.anchor, h6 > a.anchor:hover { visibility: visible; } |
| #content h1 > a.link, h2 > a.link, h3 > a.link, #toctitle > a.link, .sidebarblock > .content > .title > a.link, h4 > a.link, h5 > a.link, h6 > a.link { color: black; text-decoration: none; } |
| #content h1 > a.link:hover, h2 > a.link:hover, h3 > a.link:hover, #toctitle > a.link:hover, .sidebarblock > .content > .title > a.link:hover, h4 > a.link:hover, h5 > a.link:hover, h6 > a.link:hover { color: black; } |
| |
| .audioblock, .imageblock, .literalblock, .listingblock, .stemblock, .videoblock { margin-bottom: 1.25em; } |
| |
| .admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { text-rendering: optimizeLegibility; text-align: left; } |
| |
| table.tableblock > caption.title { white-space: nowrap; overflow: visible; max-width: 0; } |
| |
| .paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { color: black; } |
| |
| table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p { font-size: inherit; } |
| |
| .admonitionblock > table { border-collapse: separate; border: 0; background: none; width: 100%; } |
| .admonitionblock > table td.icon { text-align: center; width: 80px; } |
| .admonitionblock > table td.icon img { max-width: initial; } |
| .admonitionblock > table td.icon .title { font-weight: bold; font-family: Noto, sans-serif; text-transform: uppercase; } |
| .admonitionblock > table td.content { padding-left: 1.125em; padding-right: 1.25em; border-left: 1px solid #dddddd; color: #5e93b8; } |
| .admonitionblock > table td.content > :last-child > :last-child { margin-bottom: 0; } |
| |
| .exampleblock > .content { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; } |
| .exampleblock > .content > :first-child { margin-top: 0; } |
| .exampleblock > .content > :last-child { margin-bottom: 0; } |
| |
| .sidebarblock { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; } |
| .sidebarblock > :first-child { margin-top: 0; } |
| .sidebarblock > :last-child { margin-bottom: 0; } |
| .sidebarblock > .content > .title { color: black; margin-top: 0; } |
| |
| .exampleblock > .content > :last-child > :last-child, .exampleblock > .content .olist > ol > li:last-child > :last-child, .exampleblock > .content .ulist > ul > li:last-child > :last-child, .exampleblock > .content .qlist > ol > li:last-child > :last-child, .sidebarblock > .content > :last-child > :last-child, .sidebarblock > .content .olist > ol > li:last-child > :last-child, .sidebarblock > .content .ulist > ul > li:last-child > :last-child, .sidebarblock > .content .qlist > ol > li:last-child > :last-child { margin-bottom: 0; } |
| |
| .literalblock pre, .listingblock pre:not(.highlight), .listingblock pre[class="highlight"], .listingblock pre[class^="highlight "], .listingblock pre.CodeRay, .listingblock pre.prettyprint { background: #eeeeee; } |
| .sidebarblock .literalblock pre, .sidebarblock .listingblock pre:not(.highlight), .sidebarblock .listingblock pre[class="highlight"], .sidebarblock .listingblock pre[class^="highlight "], .sidebarblock .listingblock pre.CodeRay, .sidebarblock .listingblock pre.prettyprint { background: #f2f1f1; } |
| |
| .literalblock pre, .literalblock pre[class], .listingblock pre, .listingblock pre[class] { border: 1px hidden #666666; -webkit-border-radius: 0; border-radius: 0; word-wrap: break-word; padding: 1.25em 1.5625em 1.125em 1.5625em; font-size: 0.8125em; } |
| .literalblock pre.nowrap, .literalblock pre[class].nowrap, .listingblock pre.nowrap, .listingblock pre[class].nowrap { overflow-x: auto; white-space: pre; word-wrap: normal; } |
| @media only screen and (min-width: 768px) { .literalblock pre, .literalblock pre[class], .listingblock pre, .listingblock pre[class] { font-size: 0.90625em; } } |
| @media only screen and (min-width: 1280px) { .literalblock pre, .literalblock pre[class], .listingblock pre, .listingblock pre[class] { font-size: 1em; } } |
| |
| .literalblock.output pre { color: #eeeeee; background-color: #264357; } |
| |
| .listingblock pre.highlightjs { padding: 0; } |
| .listingblock pre.highlightjs > code { padding: 1.25em 1.5625em 1.125em 1.5625em; -webkit-border-radius: 0; border-radius: 0; } |
| |
| .listingblock > .content { position: relative; } |
| |
| .listingblock code[data-lang]:before { display: none; content: attr(data-lang); position: absolute; font-size: 0.75em; top: 0.425rem; right: 0.5rem; line-height: 1; text-transform: uppercase; color: #999; } |
| |
| .listingblock:hover code[data-lang]:before { display: block; } |
| |
| .listingblock.terminal pre .command:before { content: attr(data-prompt); padding-right: 0.5em; color: #999; } |
| |
| .listingblock.terminal pre .command:not([data-prompt]):before { content: "$"; } |
| |
| table.pyhltable { border-collapse: separate; border: 0; margin-bottom: 0; background: none; } |
| |
| table.pyhltable td { vertical-align: top; padding-top: 0; padding-bottom: 0; line-height: 1.6; } |
| |
| table.pyhltable td.code { padding-left: .75em; padding-right: 0; } |
| |
| pre.pygments .lineno, table.pyhltable td:not(.code) { color: #999; padding-left: 0; padding-right: .5em; border-right: 1px solid #dddddd; } |
| |
| pre.pygments .lineno { display: inline-block; margin-right: .25em; } |
| |
| table.pyhltable .linenodiv { background: none !important; padding-right: 0 !important; } |
| |
| .quoteblock { margin: 0 1em 0.75em 1.5em; display: table; } |
| .quoteblock > .title { margin-left: -1.5em; margin-bottom: 0.75em; } |
| .quoteblock blockquote, .quoteblock blockquote p { color: #333333; font-size: 1.15rem; line-height: 1.75; word-spacing: 0.1em; letter-spacing: 0; font-style: italic; text-align: justify; } |
| .quoteblock blockquote { margin: 0; padding: 0; border: 0; } |
| .quoteblock blockquote:before { content: "\201c"; float: left; font-size: 2.75em; font-weight: bold; line-height: 0.6em; margin-left: -0.6em; color: black; text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1); } |
| .quoteblock blockquote > .paragraph:last-child p { margin-bottom: 0; } |
| .quoteblock .attribution { margin-top: 0.5em; margin-right: 0.5ex; text-align: right; } |
| .quoteblock .quoteblock { margin-left: 0; margin-right: 0; padding: 0.5em 0; border-left: 3px solid #5e93b8; } |
| .quoteblock .quoteblock blockquote { padding: 0 0 0 0.75em; } |
| .quoteblock .quoteblock blockquote:before { display: none; } |
| |
| .verseblock { margin: 0 1em 0.75em 1em; } |
| .verseblock pre { font-family: "Open Sans", "DejaVu Sans", sans; font-size: 1.15rem; color: #333333; font-weight: 300; text-rendering: optimizeLegibility; } |
| .verseblock pre strong { font-weight: 400; } |
| .verseblock .attribution { margin-top: 1.25rem; margin-left: 0.5ex; } |
| |
| .quoteblock .attribution, .verseblock .attribution { font-size: 0.8125em; line-height: 1.45; font-style: italic; } |
| .quoteblock .attribution br, .verseblock .attribution br { display: none; } |
| .quoteblock .attribution cite, .verseblock .attribution cite { display: block; letter-spacing: -0.025em; color: #5e93b8; } |
| |
| .quoteblock.abstract { margin: 0 0 0.75em 0; display: block; } |
| .quoteblock.abstract blockquote, .quoteblock.abstract blockquote p { text-align: left; word-spacing: 0; } |
| .quoteblock.abstract blockquote:before, .quoteblock.abstract blockquote p:first-of-type:before { display: none; } |
| |
| table.tableblock { max-width: 100%; border-collapse: separate; } |
| table.tableblock td > .paragraph:last-child p > p:last-child, table.tableblock th > p:last-child, table.tableblock td > p:last-child { margin-bottom: 0; } |
| |
| table.tableblock, th.tableblock, td.tableblock { border: 0 solid #d8d8ce; } |
| |
| table.grid-all > thead > tr > .tableblock, table.grid-all > tbody > tr > .tableblock { border-width: 0 1px 1px 0; } |
| |
| table.grid-all > tfoot > tr > .tableblock { border-width: 1px 1px 0 0; } |
| |
| table.grid-cols > * > tr > .tableblock { border-width: 0 1px 0 0; } |
| |
| table.grid-rows > thead > tr > .tableblock, table.grid-rows > tbody > tr > .tableblock { border-width: 0 0 1px 0; } |
| |
| table.grid-rows > tfoot > tr > .tableblock { border-width: 1px 0 0 0; } |
| |
| table.grid-all > * > tr > .tableblock:last-child, table.grid-cols > * > tr > .tableblock:last-child { border-right-width: 0; } |
| |
| table.grid-all > tbody > tr:last-child > .tableblock, table.grid-all > thead:last-child > tr > .tableblock, table.grid-rows > tbody > tr:last-child > .tableblock, table.grid-rows > thead:last-child > tr > .tableblock { border-bottom-width: 0; } |
| |
| table.frame-all { border-width: 1px; } |
| |
| table.frame-sides { border-width: 0 1px; } |
| |
| table.frame-topbot { border-width: 1px 0; } |
| |
| th.halign-left, td.halign-left { text-align: left; } |
| |
| th.halign-right, td.halign-right { text-align: right; } |
| |
| th.halign-center, td.halign-center { text-align: center; } |
| |
| th.valign-top, td.valign-top { vertical-align: top; } |
| |
| th.valign-bottom, td.valign-bottom { vertical-align: bottom; } |
| |
| th.valign-middle, td.valign-middle { vertical-align: middle; } |
| |
| table thead th, table tfoot th { font-weight: bold; } |
| |
| tbody tr th { display: table-cell; line-height: 1.4; background: -webkit-linear-gradient(top, #add386, #90b66a); } |
| |
| tbody tr th, tbody tr th p, tfoot tr th, tfoot tr th p { color: white; font-weight: bold; } |
| |
| p.tableblock > code:only-child { background: none; padding: 0; } |
| |
| p.tableblock { font-size: 1em; } |
| |
| td > div.verse { white-space: pre; } |
| |
| ol { margin-left: 1.75em; } |
| |
| ul li ol { margin-left: 1.5em; } |
| |
| dl dd { margin-left: 1.125em; } |
| |
| dl dd:last-child, dl dd:last-child > :last-child { margin-bottom: 0; } |
| |
| ol > li p, ul > li p, ul dd, ol dd, .olist .olist, .ulist .ulist, .ulist .olist, .olist .ulist { margin-bottom: 0.375em; } |
| |
| ul.checklist, ul.none, ol.none, ul.no-bullet, ol.no-bullet, ol.unnumbered, ul.unstyled, ol.unstyled { list-style-type: none; } |
| |
| ul.no-bullet, ol.no-bullet, ol.unnumbered { margin-left: 0.625em; } |
| |
| ul.unstyled, ol.unstyled { margin-left: 0; } |
| |
| ul.checklist { margin-left: 0.625em; } |
| |
| ul.checklist li > p:first-child > .fa-square-o:first-child, ul.checklist li > p:first-child > .fa-check-square-o:first-child { width: 1.25em; font-size: 0.8em; position: relative; bottom: 0.125em; } |
| |
| ul.checklist li > p:first-child > input[type="checkbox"]:first-child { margin-right: 0.25em; } |
| |
| ul.inline { display: -ms-flexbox; display: -webkit-box; display: flex; -ms-flex-flow: row wrap; -webkit-flex-flow: row wrap; flex-flow: row wrap; list-style: none; margin: 0 0 0.375em -0.75em; } |
| |
| ul.inline > li { margin-left: 0.75em; } |
| |
| .unstyled dl dt { font-weight: normal; font-style: normal; } |
| |
| ol.arabic { list-style-type: decimal; } |
| |
| ol.decimal { list-style-type: decimal-leading-zero; } |
| |
| ol.loweralpha { list-style-type: lower-alpha; } |
| |
| ol.upperalpha { list-style-type: upper-alpha; } |
| |
| ol.lowerroman { list-style-type: lower-roman; } |
| |
| ol.upperroman { list-style-type: upper-roman; } |
| |
| ol.lowergreek { list-style-type: lower-greek; } |
| |
| .hdlist > table, .colist > table { border: 0; background: none; } |
| .hdlist > table > tbody > tr, .colist > table > tbody > tr { background: none; } |
| |
| td.hdlist1, td.hdlist2 { vertical-align: top; padding: 0 0.625em; } |
| |
| td.hdlist1 { font-weight: bold; padding-bottom: 0.75em; } |
| |
| .literalblock + .colist, .listingblock + .colist { margin-top: -0.5em; } |
| |
| .colist > table tr > td:first-of-type { padding: 0.4em 0.75em 0 0.75em; line-height: 1; vertical-align: top; } |
| .colist > table tr > td:first-of-type img { max-width: initial; } |
| .colist > table tr > td:last-of-type { padding: 0.25em 0; } |
| |
| .thumb, .th { line-height: 0; display: inline-block; border: solid 4px white; -webkit-box-shadow: 0 0 0 1px #dddddd; box-shadow: 0 0 0 1px #dddddd; } |
| |
| .imageblock.left, .imageblock[style*="float: left"] { margin: 0.25em 0.625em 1.25em 0; } |
| .imageblock.right, .imageblock[style*="float: right"] { margin: 0.25em 0 1.25em 0.625em; } |
| .imageblock > .title { margin-bottom: 0; } |
| .imageblock.thumb, .imageblock.th { border-width: 6px; } |
| .imageblock.thumb > .title, .imageblock.th > .title { padding: 0 0.125em; } |
| |
| .image.left, .image.right { margin-top: 0.25em; margin-bottom: 0.25em; display: inline-block; line-height: 0; } |
| .image.left { margin-right: 0.625em; } |
| .image.right { margin-left: 0.625em; } |
| |
| a.image { text-decoration: none; display: inline-block; } |
| a.image object { pointer-events: none; } |
| |
| sup.footnote, sup.footnoteref { font-size: 0.875em; position: static; vertical-align: super; } |
| sup.footnote a, sup.footnoteref a { text-decoration: none; } |
| sup.footnote a:active, sup.footnoteref a:active { text-decoration: underline; } |
| |
| #footnotes { padding-top: 0.75em; padding-bottom: 0.75em; margin-bottom: 0.625em; } |
| #footnotes hr { width: 20%; min-width: 6.25em; margin: -0.25em 0 0.75em 0; border-width: 1px 0 0 0; } |
| #footnotes .footnote { padding: 0 0.375em 0 0.225em; line-height: 1.3334; font-size: 0.875em; margin-left: 1.2em; margin-bottom: 0.2em; } |
| #footnotes .footnote a:first-of-type { font-weight: bold; text-decoration: none; margin-left: -1.05em; } |
| #footnotes .footnote:last-of-type { margin-bottom: 0; } |
| #content #footnotes { margin-top: -0.625em; margin-bottom: 0; padding: 0.75em 0; } |
| |
| .gist .file-data > table { border: 0; background: #fff; width: 100%; margin-bottom: 0; } |
| .gist .file-data > table td.line-data { width: 99%; } |
| |
| div.unbreakable { page-break-inside: avoid; } |
| |
| .big { font-size: larger; } |
| |
| .small { font-size: smaller; } |
| |
| .underline { text-decoration: underline; } |
| |
| .overline { text-decoration: overline; } |
| |
| .line-through { text-decoration: line-through; } |
| |
| .aqua { color: #00bfbf; } |
| |
| .aqua-background { background-color: #00fafa; } |
| |
| .black { color: black; } |
| |
| .black-background { background-color: black; } |
| |
| .blue { color: #0000bf; } |
| |
| .blue-background { background-color: #0000fa; } |
| |
| .fuchsia { color: #bf00bf; } |
| |
| .fuchsia-background { background-color: #fa00fa; } |
| |
| .gray { color: #606060; } |
| |
| .gray-background { background-color: #7d7d7d; } |
| |
| .green { color: #006000; } |
| |
| .green-background { background-color: #007d00; } |
| |
| .lime { color: #00bf00; } |
| |
| .lime-background { background-color: #00fa00; } |
| |
| .maroon { color: #600000; } |
| |
| .maroon-background { background-color: #7d0000; } |
| |
| .navy { color: #000060; } |
| |
| .navy-background { background-color: #00007d; } |
| |
| .olive { color: #606000; } |
| |
| .olive-background { background-color: #7d7d00; } |
| |
| .purple { color: #600060; } |
| |
| .purple-background { background-color: #7d007d; } |
| |
| .red { color: #bf0000; } |
| |
| .red-background { background-color: #fa0000; } |
| |
| .silver { color: #909090; } |
| |
| .silver-background { background-color: #bcbcbc; } |
| |
| .teal { color: #006060; } |
| |
| .teal-background { background-color: #007d7d; } |
| |
| .white { color: #bfbfbf; } |
| |
| .white-background { background-color: #fafafa; } |
| |
| .yellow { color: #bfbf00; } |
| |
| .yellow-background { background-color: #fafa00; } |
| |
| span.icon > .fa { cursor: default; } |
| a span.icon > .fa { cursor: inherit; } |
| |
| .admonitionblock td.icon [class^="fa icon-"] { font-size: 2.5em; text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5); cursor: default; } |
| .admonitionblock td.icon .icon-note:before { content: "\f05a"; color: #29475c; } |
| .admonitionblock td.icon .icon-tip:before { content: "\f0eb"; text-shadow: 1px 1px 2px rgba(155, 155, 0, 0.8); color: #111; } |
| .admonitionblock td.icon .icon-warning:before { content: "\f071"; color: #bf6900; } |
| .admonitionblock td.icon .icon-caution:before { content: "\f06d"; color: #bf3400; } |
| .admonitionblock td.icon .icon-important:before { content: "\f06a"; color: #bf0000; } |
| |
| .conum[data-value] { display: inline-block; color: #fff !important; background-color: black; -webkit-border-radius: 100px; border-radius: 100px; text-align: center; font-size: 0.75em; width: 1.67em; height: 1.67em; line-height: 1.67em; font-family: "Open Sans", "DejaVu Sans", sans-serif; font-style: normal; font-weight: bold; } |
| .conum[data-value] * { color: #fff !important; } |
| .conum[data-value] + b { display: none; } |
| .conum[data-value]:after { content: attr(data-value); } |
| pre .conum[data-value] { position: relative; top: -0.125em; } |
| |
| b.conum * { color: inherit !important; } |
| |
| .conum:not([data-value]):empty { display: none; } |
| |
| h1, h2, h3, #toctitle, .sidebarblock > .content > .title, h4, h5, h6 { border-bottom: 1px solid #dddddd; } |
| |
| .sect1 { padding-bottom: 0; } |
| |
| #toctitle { color: #00406F; font-weight: normal; margin-top: 1.5em; } |
| |
| .sidebarblock { border-color: #aaa; } |
| |
| code { -webkit-border-radius: 4px; border-radius: 4px; } |
| |
| p.tableblock.header { color: #6d6e71; } |
| |
| .literalblock pre, .listingblock pre { background: #eeeeee; } |
| |
| </style> |
| <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css"> |
| <style> |
| /* Stylesheet for CodeRay to match GitHub theme | MIT License | http://foundation.zurb.com */ |
| /*pre.CodeRay {background-color:#f7f7f8;}*/ |
| .CodeRay .line-numbers{border-right:1px solid #d8d8d8;padding:0 0.5em 0 .25em} |
| .CodeRay span.line-numbers{display:inline-block;margin-right:.5em;color:rgba(0,0,0,.3)} |
| .CodeRay .line-numbers strong{color:rgba(0,0,0,.4)} |
| table.CodeRay{border-collapse:separate;border-spacing:0;margin-bottom:0;border:0;background:none} |
| table.CodeRay td{vertical-align: top;line-height:1.45} |
| table.CodeRay td.line-numbers{text-align:right} |
| table.CodeRay td.line-numbers>pre{padding:0;color:rgba(0,0,0,.3)} |
| table.CodeRay td.code{padding:0 0 0 .5em} |
| table.CodeRay td.code>pre{padding:0} |
| .CodeRay .debug{color:#fff !important;background:#000080 !important} |
| .CodeRay .annotation{color:#007} |
| .CodeRay .attribute-name{color:#000080} |
| .CodeRay .attribute-value{color:#700} |
| .CodeRay .binary{color:#509} |
| .CodeRay .comment{color:#998;font-style:italic} |
| .CodeRay .char{color:#04d} |
| .CodeRay .char .content{color:#04d} |
| .CodeRay .char .delimiter{color:#039} |
| .CodeRay .class{color:#458;font-weight:bold} |
| .CodeRay .complex{color:#a08} |
| .CodeRay .constant,.CodeRay .predefined-constant{color:#008080} |
| .CodeRay .color{color:#099} |
| .CodeRay .class-variable{color:#369} |
| .CodeRay .decorator{color:#b0b} |
| .CodeRay .definition{color:#099} |
| .CodeRay .delimiter{color:#000} |
| .CodeRay .doc{color:#970} |
| .CodeRay .doctype{color:#34b} |
| .CodeRay .doc-string{color:#d42} |
| .CodeRay .escape{color:#666} |
| .CodeRay .entity{color:#800} |
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| <body class="book toc2 toc-left" style="max-width: 100;"> |
| <div id="header"> |
| <h1>The OpenCL<sup>™</sup> C++ 1.0 Specification</h1> |
| <div class="details"> |
| <span id="author" class="author">Khronos<sup>®</sup> OpenCL Working Group</span><br> |
| <span id="revnumber">version v2.2-10,</span> |
| <span id="revdate">Tue, 05 Feb 2019 21:18:46 +0000</span> |
| <br><span id="revremark">from git branch: commit: 00422daf5dc013f21ab633479577c7cc225150e2</span> |
| </div> |
| <div id="toc" class="toc2"> |
| <div id="toctitle">Table of Contents</div> |
| <ul class="sectlevel1"> |
| <li><a href="#generic-type-name-notation">1. Generic Type Name Notation</a></li> |
| <li><a href="#openclcpp-programming-language">2. OpenCL C++ Programming Language</a> |
| <ul class="sectlevel2"> |
| <li><a href="#supported-builtin-data-types">2.1. Supported Built-in Data Types</a></li> |
| <li><a href="#keywords">2.2. Keywords</a></li> |
| <li><a href="#implicit-type-conversions">2.3. Implicit Type Conversions</a></li> |
| <li><a href="#expressions">2.4. Expressions</a></li> |
| <li><a href="#address-spaces">2.5. Address Spaces</a></li> |
| <li><a href="#kernel-functions">2.6. Kernel Functions</a></li> |
| <li><a href="#preprocessor-directives-and-macros">2.7. Preprocessor Directives and Macros</a></li> |
| <li><a href="#attribute-qualifiers">2.8. Attribute Qualifiers</a></li> |
| <li><a href="#opencl_cxx_restrictions">2.9. Restrictions</a></li> |
| </ul> |
| </li> |
| <li><a href="#opencl-c-standard-library">3. OpenCL C++ Standard Library</a> |
| <ul class="sectlevel2"> |
| <li><a href="#opencl-definitions">3.1. OpenCL Definitions</a></li> |
| <li><a href="#conversions-library">3.2. Conversions Library</a></li> |
| <li><a href="#reinterpreting-data-library">3.3. Reinterpreting Data Library</a></li> |
| <li><a href="#address-spaces-library">3.4. Address Spaces Library</a></li> |
| <li><a href="#specialization-constants-library">3.5. Specialization Constants Library</a></li> |
| <li><a href="#half-wrapper-library">3.6. Half Wrapper Library</a></li> |
| <li><a href="#vector-wrapper-library">3.7. Vector Wrapper Library</a></li> |
| <li><a href="#range-library">3.8. Range Library</a></li> |
| <li><a href="#vector-utilities-library">3.9. Vector Utilities Library</a></li> |
| <li><a href="#marker-types">3.10. Marker Types</a></li> |
| <li><a href="#images-and-samplers-library">3.11. Images and Samplers Library</a></li> |
| <li><a href="#pipes-library">3.12. Pipes Library</a></li> |
| <li><a href="#device-enqueue-library">3.13. Device Enqueue Library</a></li> |
| <li><a href="#work-item-functions">3.14. Work-Item Functions</a></li> |
| <li><a href="#work-group-functions">3.15. Work-group Functions</a></li> |
| <li><a href="#synchronization-functions">3.16. Synchronization Functions</a></li> |
| <li><a href="#common-functions">3.17. Common Functions</a></li> |
| <li><a href="#geometric-functions">3.18. Geometric Functions</a></li> |
| <li><a href="#math-functions">3.19. Math Functions</a></li> |
| <li><a href="#integer-functions">3.20. Integer Functions</a></li> |
| <li><a href="#relational-functions">3.21. Relational Functions</a></li> |
| <li><a href="#vector-data-load-and-store-functions">3.22. Vector Data Load and Store Functions</a></li> |
| <li><a href="#printf">3.23. printf</a></li> |
| <li><a href="#atomic-operations-library">3.24. Atomic Operations Library</a></li> |
| <li><a href="#array-library">3.25. Array Library</a></li> |
| <li><a href="#limits-library">3.26. Limits Library</a></li> |
| <li><a href="#math-constants-library">3.27. Math Constants Library</a></li> |
| <li><a href="#tuple-library">3.28. Tuple Library</a></li> |
| <li><a href="#type-traits-library">3.29. Type Traits Library</a></li> |
| <li><a href="#iterator-library">3.30. Iterator Library</a></li> |
| <li><a href="#general-utilities-library">3.31. General Utilities Library</a></li> |
| </ul> |
| </li> |
| <li><a href="#opencl-numerical-compliance">4. OpenCL Numerical Compliance</a> |
| <ul class="sectlevel2"> |
| <li><a href="#rounding-modes-1">4.1. Rounding Modes</a></li> |
| <li><a href="#inf-nan-and-denormalized-numbers">4.2. INF, NaN and Denormalized Numbers</a></li> |
| <li><a href="#floating-point-exceptions">4.3. Floating-Point Exceptions</a></li> |
| <li><a href="#relative-error-as-ulps">4.4. Relative Error as ULPs</a></li> |
| <li><a href="#edge-case-behavior">4.5. Edge Case Behavior</a></li> |
| </ul> |
| </li> |
| <li><a href="#image-addressing-and-filtering">5. Image Addressing and Filtering</a> |
| <ul class="sectlevel2"> |
| <li><a href="#image-coordinates">5.1. Image Coordinates</a></li> |
| <li><a href="#addressing-and-filter-modes">5.2. Addressing and Filter Modes</a></li> |
| <li><a href="#conversion-rules">5.3. Conversion Rules</a></li> |
| <li><a href="#selecting-an-image-from-an-image-array">5.4. Selecting an Image from an Image Array</a></li> |
| </ul> |
| </li> |
| <li><a href="#compiler_options">6. Compiler options</a> |
| <ul class="sectlevel2"> |
| <li><a href="#preprocessor_options">6.1. Preprocessor options</a></li> |
| <li><a href="#options-controlling_the-opencl_c_version">6.2. Options Controlling the OpenCL C++ version</a></li> |
| <li><a href="#fp16_and_fp64_options">6.3. Double and half-precision floating-point options</a></li> |
| <li><a href="#other_options">6.4. Other options</a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <div id="content"> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Copyright 2008-2019 The Khronos Group.</p> |
| </div> |
| <div class="paragraph"> |
| <p>This specification is protected by copyright laws and contains material proprietary |
| to the Khronos Group, Inc. Except as described by these terms, it or any components |
| may not be reproduced, republished, distributed, transmitted, displayed, broadcast |
| or otherwise exploited in any manner without the express prior written permission |
| of Khronos Group.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Khronos Group grants a conditional copyright license to use and reproduce the |
| unmodified specification for any purpose, without fee or royalty, EXCEPT no licenses |
| to any patent, trademark or other intellectual property rights are granted under |
| these terms. Parties desiring to implement the specification and make use of |
| Khronos trademarks in relation to that implementation, and receive reciprocal patent |
| license protection under the Khronos IP Policy must become Adopters and confirm the |
| implementation as conformant under the process defined by Khronos for this |
| specification; see <a href="https://www.khronos.org/adopters" class="bare">https://www.khronos.org/adopters</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Khronos Group makes no, and expressly disclaims any, representations or warranties, |
| express or implied, regarding this specification, including, without limitation: |
| merchantability, fitness for a particular purpose, non-infringement of any |
| intellectual property, correctness, accuracy, completeness, timeliness, and |
| reliability. Under no circumstances will the Khronos Group, or any of its Promoters, |
| Contributors or Members, or their respective partners, officers, directors, |
| employees, agents or representatives be liable for any damages, whether direct, |
| indirect, special or consequential damages for lost revenues, lost profits, or |
| otherwise, arising from or in connection with these materials.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Vulkan and Khronos are registered trademarks, and OpenXR, SPIR, SPIR-V, SYCL, WebGL, |
| WebCL, OpenVX, OpenVG, EGL, COLLADA, glTF, NNEF, OpenKODE, OpenKCAM, StreamInput, |
| OpenWF, OpenSL ES, OpenMAX, OpenMAX AL, OpenMAX IL, OpenMAX DL, OpenML and DevU are |
| trademarks of the Khronos Group Inc. ASTC is a trademark of ARM Holdings PLC, |
| OpenCL is a trademark of Apple Inc. and OpenGL and OpenML are registered trademarks |
| and the OpenGL ES and OpenGL SC logos are trademarks of Silicon Graphics |
| International used under license by Khronos. All other product names, trademarks, |
| and/or company names are used solely for identification and belong to their |
| respective owners.</p> |
| </div> |
| <div style="page-break-after: always;"></div> |
| <h2 id="acknowledgements" class="float">Acknowledgements</h2> |
| <div class="paragraph"> |
| <p>The OpenCL C++ specification is the result of the contributions of many people, representing a cross section of the desktop, hand-held, and embedded computer industry. |
| Following is a partial list of the contributors, including the company that they represented at the time of their contribution:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Eric Berdahl, Adobe</p> |
| </li> |
| <li> |
| <p>Aaftab Munshi, Apple</p> |
| </li> |
| <li> |
| <p>Brian Sumner, AMD</p> |
| </li> |
| <li> |
| <p>Andrew Richards, Codeplay</p> |
| </li> |
| <li> |
| <p>Maria Rovatsou, Codeplay</p> |
| </li> |
| <li> |
| <p>Adam Stański, Intel</p> |
| </li> |
| <li> |
| <p>Alexey Bader, Intel</p> |
| </li> |
| <li> |
| <p>Allen Hux, Intel</p> |
| </li> |
| <li> |
| <p>Bartosz Sochacki, Intel</p> |
| </li> |
| <li> |
| <p>Ben Ashbaugh, Intel</p> |
| </li> |
| <li> |
| <p>Kevin Stevens, Intel</p> |
| </li> |
| <li> |
| <p>Łukasz Dudziak, Intel</p> |
| </li> |
| <li> |
| <p>Łukasz Towarek, Intel</p> |
| </li> |
| <li> |
| <p>Marcin Walkowiak, Intel</p> |
| </li> |
| <li> |
| <p>Michael Kinsner, Intel</p> |
| </li> |
| <li> |
| <p>Raun Krisch, Intel</p> |
| </li> |
| <li> |
| <p>Tomasz Fiechowski, Intel</p> |
| </li> |
| <li> |
| <p>Kedar Patil, NVIDIA</p> |
| </li> |
| <li> |
| <p>Yuan Lin, NVIDIA</p> |
| </li> |
| <li> |
| <p>Alex Bourd, Qualcomm</p> |
| </li> |
| <li> |
| <p>Lee Howes, Qualcomm</p> |
| </li> |
| <li> |
| <p>Anton Gorenko, StreamComputing</p> |
| </li> |
| <li> |
| <p>Jakub Szuppe, StreamComputing</p> |
| </li> |
| <li> |
| <p>James Price, University of Bristol</p> |
| </li> |
| <li> |
| <p>Paul Preney, University of Windsor</p> |
| </li> |
| <li> |
| <p>Ronan Keryell, Xilinx</p> |
| </li> |
| <li> |
| <p>AJ Guillon, YetiWare Inc.</p> |
| </li> |
| </ul> |
| </div> |
| <div style="page-break-after: always;"></div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="generic-type-name-notation">1. Generic Type Name Notation</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The generic type names are used when some entity has multiple overloads which differ only by argument(s). |
| They can map to one or more built-in data types. |
| The tables below describe these mappings in details.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Assuming that <code>gentype</code> maps to built-in types: <code>float</code>, <code>int</code> and <code>uint</code>, when coming across definition:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>gentype function(gentype x);</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>reader should understand that such function has in fact three overloads:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>float function(float x); |
| int function(int x); |
| uint function(uint x);</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Note that if a function signature has multiple usages of <code>gentype</code> they all should map to the same type. |
| Following this rule such overloads are then invalid:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>float function(int x); |
| uint function(float x); |
| // etc.</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>If a function is meant to have such overloads, respective gentypes in its signature should be postfixed with numbers to indicate they represent different types. |
| Declaration like this:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>cl::common_type_t<gentype1, gentype2> greater(gentype1 x, gentype2 y);</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>would match following overloads:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>cl::common_type_t<float, float> greater(float x, float y); |
| cl::common_type_t<float, int> greater(float x, int y); |
| cl::common_type_t<float, uint> greater(float x, uint y); |
| cl::common_type_t<int, float> greater(int x, float y); |
| |
| // etc.</code></pre> |
| </div> |
| </div> |
| <table class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 1. generic types</caption> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top"><strong>generic type</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>corresponding built-in types</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>typen</code></p></td> |
| <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph"> |
| <p>scalar and all vector types of type</p> |
| </div> |
| <div class="paragraph"> |
| <p>Example:</p> |
| </div> |
| <div class="exampleblock"> |
| <div class="content"> |
| <div class="paragraph"> |
| <p><code>floatn</code> matches: <code>float</code>, <code>float2</code>, <code>float3</code>, <code>float4</code>, <code>float8</code> and <code>float16</code><br> |
| <code>floatn</code> doesn’t match: <code>half</code>, <code>int2</code></p> |
| </div> |
| </div> |
| </div></div></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>gentype</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">unspecified in global context, should be defined whenever used</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>sgentype</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">subset of scalar types from types matched by <code>gentype</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ugentype</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">subset of unsigned integer types from types matched by <code>gentype</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>gentypeh</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>half</code>, <code>half2</code>, <code>half3</code>, <code>half4</code>, <code>half8</code> or <code>half16</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>gentypef</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>float</code>, <code>float2</code>, <code>float3</code>, <code>float4</code>, <code>float8</code> or <code>float16</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>gentyped</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>double</code>, <code>double2</code>, <code>double3</code>, <code>double4</code>, <code>double8</code> or <code>double16</code></p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="openclcpp-programming-language">2. OpenCL C++ Programming Language</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>This section describes the OpenCL C++ programming language used to create kernels that are executed on OpenCL device(s). |
| The OpenCL C++ programming language is based on the ISO/IEC JTC1 SC22 WG21 N 3690 language specification (a.k.a. C++14 specification) with specific restrictions (see the <a href="#opencl_cxx_restrictions"><em>OpenCL C++ restrictions</em></a> section). |
| Please refer to this specification for a detailed description of the language grammar. |
| This section describes restrictions to the C++14 specification supported in OpenCL C++.</p> |
| </div> |
| <div class="sect2"> |
| <h3 id="supported-builtin-data-types">2.1. Supported Built-in Data Types</h3> |
| <div class="paragraph"> |
| <p>The following data types are supported.</p> |
| </div> |
| <div class="sect3"> |
| <h4 id="builtin-scalar-data-types">2.1.1. Built-in Scalar Data Types</h4> |
| <table id="device_builtin_scalar_data_types" class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 2. Device Built-in scalar data types</caption> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top"><strong>Type</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Description</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>bool</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A data type which is either <code>true</code> or <code>false</code>. (<em>See section 2.14.6 lex.bool and section 3.9.1 basic.fundamental of the C++14 Specification.</em>)</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>char</code>, <code>signed char</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A signed two’s complement 8-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned char</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">An unsigned 8-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>short</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A signed two’s complement 16-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned short</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">An unsigned 16-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>int</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A signed two’s complement 32-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned int</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">An unsigned 32-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>long</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A signed two’s complement 64-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned long</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">An unsigned 64-bit integer.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>float</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A 32-bit floating-point. |
| The float data type must conform to the IEEE 754 single precision storage format.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>double</code> <a id="ftnref2"></a> <a href="#ftn2">[2]</a></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A 64-bit floating-point. |
| The double data type must conform to the IEEE 754 double precision storage format.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>half</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A 16-bit floating-point. |
| The half data type must conform to the IEEE 754-2008 half precision storage format.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>void</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">The <code>void</code> type comprises an empty set of values; it is an incomplete type that cannot be completed.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>Most built-in scalar data types are also declared as appropriate types in the OpenCL API (and header files) that can be used by an application. |
| The following table describes the built-in scalar data type in the OpenCL C++ programming language and the corresponding data type available to the application:</p> |
| </div> |
| <table id="host_scalar_builtin_data_types" class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 3. Host Scalar Built-in Data Types</caption> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top"><strong>Type in OpenCL Language</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>API type for application</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>bool</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">n/a, i.e., there is no corresponding <code>cl_bool</code> type.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>char</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_char</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned char</code>, <code>uchar</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_uchar</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>short</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_short</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned short</code>, <code>ushort</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_ushort</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>int</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_int</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned int</code>, <code>uint</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_uint</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>long</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_long</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>unsigned long</code>, <code>ulong</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_ulong</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>float</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_float</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>double</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_double</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>half</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_half</code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>void</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>void</code></p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="sect4"> |
| <h5 id="builtin-half-data-type">Built-in Half Data Type</h5> |
| <div class="paragraph"> |
| <p>The <code>half</code> data type must be IEEE 754-2008 compliant. |
| <code>half</code> numbers have 1 sign bit, 5 exponent bits, and 10 mantissa bits. |
| The interpretation of the sign, exponent and mantissa is analogous to IEEE 754 floating-point numbers.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The exponent bias is 15. |
| The <code>half</code> data type must represent finite and normal numbers, denormalized numbers, infinities and NaN. |
| Denormalized numbers for the <code>half</code> data type which may be generated when converting a <code>float</code> to a <code>half</code> using <code>vstore_half</code> and converting a <code>half</code> to a <code>float</code> using <code>vload_half</code> cannot be flushed to zero.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Conversions from <code>float</code> to <code>half</code> correctly round the mantissa to 11 bits of precision.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Conversions from <code>half</code> to <code>float</code> are lossless; all <code>half</code> numbers are exactly representable as <code>float</code> values.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>half</code> data type can only be used to declare a pointer to a buffer that contains <code>half</code> values. |
| All other operations are not allowed if the <strong>cl_khr_fp16</strong> extension is not supported.</p> |
| </div> |
| <div class="paragraph"> |
| <p>A few valid examples are given below:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>#include <opencl_def> |
| #include <opencl_memory> |
| #include <opencl_vector_load_store> |
| |
| float bar(half *a) { |
| return cl::vload_half< 1 >(0, a); |
| } |
| |
| kernel void foo(cl::global_ptr<half> pg) { //ok: a global pointer |
| // passed from the host |
| int offset = 1; |
| |
| half *ptr = pg.get() + offset; //ok: half pointer arithmetic |
| float b = bar(ptr); |
| |
| if(b < *ptr) { //not allowed: it is only supported if cl_khr_fp16 |
| // extension is enabled |
| //... |
| } |
| }</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The <code>half</code> scalar data type is required to be supported as a data storage format. |
| Vector data load and store functions (described in the <a href="#vector-data-load-and-store-functions"><em>Vector Data Load and Store Functions</em></a> section) must be supported.</p> |
| </div> |
| </div> |
| <div class="sect4"> |
| <h5 id="cl_khr_fp16-extension"><strong>cl_khr_fp16</strong> extension</h5> |
| <div class="paragraph"> |
| <p>This extension adds support for <code>half</code> scalar and vector types as built-in types that can be used for arithmetic operations, conversions etc. |
| An application that wants to use <code>half</code> and <code>halfn</code> types will need to specify the <code>-cl-fp16-enable</code> compiler option (see the <a href="#fp16_and_fp64_options"><em>Double and half-precision floating-point options</em></a> section).</p> |
| </div> |
| <div class="paragraph"> |
| <p>The OpenCL compiler accepts an h and H suffix on floating point literals, indicating the literal is typed as a <code>half</code></p> |
| </div> |
| <div class="paragraph"> |
| <p>A few valid examples:</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>#include <opencl_def> |
| #include <opencl_memory> |
| |
| half bar(half a) { |
| half b = a; |
| b += 10.0h; //ok: cl_khr_fp16 extension is enabled. All arithmetic |
| // operations on half built-in type are available |
| |
| return b; |
| } |
| |
| kernel void foo(cl::global_ptr<half> pg) { |
| int offset = 1; |
| |
| half *ptr = pg.get() + offset; |
| half b = bar(*ptr); |
| |
| if(b < *ptr) { //ok: cl_khr_fp16 extension is enabled. |
| // All comparison operations are available |
| //... |
| } |
| }</code></pre> |
| </div> |
| </div> |
| </div> |
| <div class="sect4"> |
| <h5 id="hexadecimal-floating-point-literals">Hexadecimal floating point literals</h5> |
| <div class="paragraph"> |
| <p>Hexadecimal floating point literals are supported in OpenCL C++.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>float f = 0x1.fffffep127f |
| double d = 0x1.fffffffffffffp1023; |
| half h = 0x1.ffcp15h;</code></pre> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="sect3"> |
| <h4 id="builtin-vector-data-types">2.1.2. Built-in Vector Data Types</h4> |
| <div class="sect4"> |
| <h5 id="supported-vector-data-types">Supported Vector Data Types</h5> |
| <div class="paragraph"> |
| <p>The <code>bool</code>, <code>char</code>, <code>unsigned char</code>, <code>short</code>, <code>unsigned short</code>, <code>int</code>, <code>unsigned int</code>, <code>long</code>, <code>unsigned long</code>, <code>half</code>, <code>float</code> and <code>double</code> vector data types are supported. |
| The vector data type is defined with the type name i.e. <code>bool</code>, <code>char</code>, <code>uchar</code>, <code>short</code>, <code>ushort</code>, <code>int</code>, <code>uint</code>, <code>long</code>, <code>ulong</code>, <code>half</code>, <code>float</code> or <code>double</code> followed by a literal value <em>n</em> that defines the number of elements in the vector. |
| Supported values of <em>n</em> are 2, 3, 4, 8, and 16 for all vector data types.</p> |
| </div> |
| <table id="device_builtin_vector_data_types" class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 4. Device Built-in Vector Data Types</caption> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top"><strong>Type</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Description</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>bool<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> boolean values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>char<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 8-bit signed two’s complement integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>uchar<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 8-bit unsigned integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>short<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">vector of <em>n</em> 16-bit signed two’s complement integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ushort<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 16-bit unsigned integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>int<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 32-bit signed two’s complement integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>uint<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 32-bit unsigned integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>long<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 64-bit signed two’s complement integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ulong<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 64-bit unsigned integer values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>half<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 16-bit floating-point values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>float<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 32-bit floating-point values.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>double<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">A vector of <em>n</em> 64-bit floating-point values.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>The built-in vector data types are also declared as appropriate types in the OpenCL API (and header files) that can be used by an application. |
| The following table describes the built-in vector data type in the OpenCL C++ programming language and the corresponding data type available to the application:</p> |
| </div> |
| <table id="host_builtin_vector_data_types" class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 5. Host Built-in Vector Data Types</caption> |
| <colgroup> |
| <col style="width: 50%;"> |
| <col style="width: 50%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top"><strong>Type in OpenCL Language</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>API type for application</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>bool<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">n/a, i.e., there is no corresponding <code>cl_bool<em>n</em></code> type.</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>char<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_char<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>uchar<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_uchar<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>short<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_short<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ushort<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_ushort<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>int<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_int<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>uint<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_uint<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>long<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_long<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>ulong<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_ulong<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>half<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_half<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>float<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_float<em>n</em></code></p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>double<em>n</em></code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>cl_double<em>n</em></code></p></td> |
| </tr> |
| </tbody> |
| </table> |
| <div class="paragraph"> |
| <p>The <code>half<em>n</em></code> vector data type is required to be supported as a data storage format. |
| Vector data load and store functions (described in the <a href="#vector-data-load-and-store-functions"><em>Vector Data Load and Store Functions</em></a> section) must be supported.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Support for the <code>double<em>n</em></code> vector data type is optional.</p> |
| </div> |
| </div> |
| <div class="sect4"> |
| <h5 id="vector-changes-to-cpp14-standard">Vector Changes to C++14 standard</h5> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>Vector types are classified as fundamental (<em>[ISO/IEC 14882:2014: basic.fundamental, ch. 3.9.1]</em>) and literal types</p> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| A vector type behave similarly to a trivially destructible class with all data members of literal type and all of its constructors defined as constexpr constructors |
| </td> |
| </tr> |
| </table> |
| </div> |
| </li> |
| <li> |
| <p>Abbreviating vector type as Tn, T is called the component type of a vector. |
| The numerical value n specifies number of components in a vector. |
| <a href="#device_builtin_vector_data_types">Device built-in vector data types</a> table specifies supported vector types.</p> |
| <div class="paragraph"> |
| <p>A vector type which component type is <em>integral type</em> is called <em>integral vector type</em>. |
| A vector type which component is <em>floating-point type</em> is called <em>floating-point vector type</em>.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>float8 a; // component type: float, number of components: 8 |
| uint16 b; // component type: uint, number of components: 16</code></pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>An <em>integral vector type</em> can be used as type of value of non-type template-parameter. |
| The change is introduced by following changes in C++ specification:</p> |
| <div class="openblock"> |
| <div class="content"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><em>[ISO/IEC 14882:2014: temp.param, ch. 14.1 (4, 4.1)]</em> Template parameters: A non-type template-parameter shall have one of the following (optionally cv-qualified) types:</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>integral, integral vector or enumeration type,</p> |
| </li> |
| <li> |
| <p>integral, integral vector or enumeration type,</p> |
| </li> |
| <li> |
| <p>[ …​ ]</p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p><em>[ISO/IEC 14882:2014: temp.param, ch. 14.1 (7)]</em> Template parameters: A non-type <em>template-parameter</em> shall not be declared to have floating point, floating-point vector, class, or void type.</p> |
| </li> |
| <li> |
| <p><em>[ISO/IEC 14882:2014: temp.type, ch. 14.4 (1, 1.3)]</em> Type equivalence: Two <em>template-ids</em> refer to the same class, function, or variable if</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>[ …​ ]</p> |
| </li> |
| <li> |
| <p>their corresponding non-type template arguments of integral, integral vector or enumeration type have identical values and</p> |
| </li> |
| <li> |
| <p>[ …​ ]</p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p><em>[ISO/IEC 14882:2014: temp.res, ch. 14.6 (8, 8.3, 8.3.1)]</em> Name resolution: […​] If the interpretation of such a construct in the hypothetical instantiation is different from the interpretation of the corresponding construct</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>integral, integral vector or enumeration type, in any actual instantiation of the template, the program is ill-formed; no diagnostic is required. |
| This can happen in situations including the following:</p> |
| </li> |
| <li> |
| <p>[ …​ ]</p> |
| </li> |
| <li> |
| <p>constant expression evaluation (5.20) within the template instantiation uses</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>the value of a const object of integral, integral vector or unscoped enumeration type or</p> |
| </li> |
| <li> |
| <p>[ …​ ]</p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p>[ …​ ]</p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| </li> |
| </ol> |
| </div> |
| </div> |
| <div class="sect4"> |
| <h5 id="vector-component-access">Vector Component Access</h5> |
| <div class="olist arabic"> |
| <ol class="arabic"> |
| <li> |
| <p>The components of vector type can be accessed using swizzle expression. |
| The syntax of a swizzle expression is similar to syntax used in class member access expression <em>[ISO/IEC 14882:2014: expr.ref, ch. 5.2.5]</em>: |
| The swizzle expression is a postfix expression formed with a postfix expression followed by a dot <code>.</code> or an arrow <code>-></code> and then followed by an <em>vector-swizzle-selector</em>. The postfix expression before the dot or arrow is evaluated. The result of that evaluation, together with the <em>vector-swizzle-selector</em>, determines the result of the entire postfix expression.</p> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>float4 v1 = float4(1.0f, 2.0f, 3.0f, 4.0f); |
| float4 *pv1 = &v1; |
| |
| float2 v2 = v1.xz; // v1.xz is a swizzle expression |
| float3 v3 = pv1->s321; // pv1->s321 is a swizzle expression |
| // equivalent to (*pv1).s321 |
| (*pv1).rgb = float3(0.0f, 0.5f, 1.0f); // (*pv1).rgb is a swizzle expression |
| pv1->lo.hi = 0.0f; // pv1->lo and pv1->lo.hi are swizzle |
| // expressions</code></pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>For the first option (dot) the first expression shall have vector type or be a swizzle expression which results in vector-swizzle of vector type. |
| For the second option (arrow) the first expression shall have pointer to vector type. |
| The expression <code>E1->E2</code> is converted to the equivalent form <code>(*(E1)).E2</code>; the remainder of <a href="#vector-component-access">Vector Component Access</a> will address only the first option (dot).</p> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| <code>(*(E1))</code> is lvalue. In either case, the <em>vector-swizzle-selector</em> shall name a vector component selection of a swizzle. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>uint8 v1 = uint8(10, 11, 12, 13, 14, 15, 16, 17); |
| |
| uint4 v2 = v1.s7301; // correct |
| uint3 v3 = (&v1)->s246; // correct |
| uint4 v4 = v1->s0123; // ill-formed: v1 is not a pointer to |
| // vector type |
| |
| uint8 *pv1 = &v1; |
| |
| uint2 v5 = pv1->S13; // correct |
| uint2 v6 = (*pv1).s0745.even; // correct |
| uint4 v7 = pv1.odd; // ill-formed: pv1 is not vector or |
| // vector-swizzle</code></pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p>Abbreviating <em>postfix-expression.vector-swizzle-selector</em> as <code>E1.E2</code>, <code>E1</code> is called the vector expression. |
| The type and value category of <code>E1.E2</code> are determined as follows. |
| In the remainder of <a href="#vector-component-access">Vector Component Access</a>, <em>cq</em> represents either <code>const</code> or the absence of <code>const</code> and <em>vq</em> represents either <code>volatile</code> or the absence of <code>volatile</code>. |
| cv represents an arbitrary set of cv-qualifiers, as defined in <em>[ISO/IEC 14882:2014: basic.type.qualifier, ch. 3.9.3]</em> .</p> |
| </li> |
| <li> |
| <p><em>vector-swizzle-selector</em> is subset of <em>identifier</em> with following syntax:</p> |
| <div class="openblock"> |
| <div class="content"> |
| <div class="paragraph"> |
| <p> |
| <em>vector-swizzle-selector</em>:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><em>vector-swizzle-xyzw-selector</em>:</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><em>vector-swizzle-xyzw-selector-value</em></p> |
| </li> |
| <li> |
| <p><em>vector-swizzle-xyzw-selector vector-swizzle-xyzw-selector-value</em></p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p><em>vector-swizzle-rgba-selector</em>:</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><em>vector-swizzle-rgba-selector-value</em></p> |
| </li> |
| <li> |
| <p><em>vector-swizzle-rgba-selector vector-swizzle-rgba-selector-value</em></p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p><em>vector-swizzle-special-selector</em>:</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>hi</code></p> |
| </li> |
| <li> |
| <p><code>lo</code></p> |
| </li> |
| <li> |
| <p><code>even</code></p> |
| </li> |
| <li> |
| <p><code>odd</code></p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| <li> |
| <p><em>vector-swizzle-num-selector</em>:</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>s</code> <em>vector-swizzle-num-selector-values</em></p> |
| </li> |
| <li> |
| <p><code>S</code> <em>vector-swizzle-num-selector-values</em></p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="openblock"> |
| <div class="content"> |
| <div class="paragraph"> |
| <p> |
| <em>vector-swizzle-num-selector-values</em>:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><em>vector-swizzle-num-selector-value</em></p> |
| </li> |
| <li> |
| <p><em>vector-swizzle-num-selector-values vector-swizzle-num-selector-value</em></p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p> |
| <em>vector-swizzle-xyzw-selector-value</em>: one of <code>x y z w</code></p> |
| </div> |
| <div class="paragraph"> |
| <p> |
| <em>vector-swizzle-rgba-selector-value</em>: one of <code>r g b a</code></p> |
| </div> |
| <div class="paragraph"> |
| <p> |
| <em>vector-swizzle-num-selector-value</em>: one of <code>0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F</code></p> |
| </div> |
| <div class="openblock"> |
| <div class="content"> |
| <div class="paragraph"> |
| <p> |
| with following restrictions:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><em>vector-swizzle-selector</em> in a form of <em>vector-swizzle-special-selector</em> shall only be used with vector expression with at least 2 components.</p> |
| </li> |
| <li> |
| <p><em>vector-swizzle-selector</em> shall not select components beyond those available in vector expression.</p> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| <a href="#selector_values_and_their_corresponding_components_in_swizzle">Selector values and their corresponding components in swizzle</a> table describes relation between selector value and components. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </li> |
| <li> |
| <p><em>vector-swizzle-selector</em> shall have swizzle size of 1, 2, 3, 4, 8 or 16.</p> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| Result from the swizzle expression shall be either of scalar or of valid vector type. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p> |
| If <em>vector-swizzle-selector</em> does not meet requirements, the swizzle expression is ill-formed.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="CodeRay highlight"><code>int2 v2; |
| int3 v3; |
| int4 v4; |
| int8 v8; |
| int16 v16; |
| |
| v4.xyz = int3(1, 2, 3); // correct: xyz selector |
| v4.baS01 = v8.lo; // ill-formed: baS01 is mix of rgba |
| // and numerical selectors |
| v3.rx = int2(20, 7); // ill-formed: mix of rgba and |
| // xyzw selectors |
| |
| int v2c1 = v2.z; // correct: xyzw selector |
| int v3c1 = v3.b; // correct: rgba selector |
| int2 v4c1 = v4.ww; // correct: xyzw selector |
| int3 v8c1 = v8.xyz; // ill-formed: xyzw and rgba selectors |
| // are not allowed on vector expressions |
| // with more than 4 components |
| int2 v8c2 = v8.hi.xyz; // correct: xyzw selector on vector |
| // expression v8.hi (vector-swizzle |
| // of int4 type) |
| |
| int2 v3c2 = v3.odd; // correct: special selector |
| int2 v3c2 = v3.x.even; // ill-formed: #1 vector expression |
| // is invalid (vector swizzle of |
| // scalar type) |
| // #2 special selector cannot be |
| // used with less than 2 components |
| |
| v3.x = 1; // correct: xyzw selector |
| v3.w = 2; // ill-formed: there is no "w" component in int3 |
| v2.gb = v4.hi; // ill-formed: there is no "b" component in int2 |
| v8.S7890 = v4; // ill-formed: int8 allows numerical selector |
| // in range 0-7 |
| |
| auto v16c1 = v16.s012; // correct: numerical selector |
| auto v16c2 = v16.s467899; // ill-formed: swizzle expression |
| // has not allowed size |
| // (there is no int6 type) |
| |
| int16 vv1 = int16(v16.S98aabb01, v2, v2.gr, v3.xxxx); // correct |
| int16 vv2 = int16(v16.S98aabb0123, v2.gr, v3.xxxx); |
| // ill-formed: |
| // although it sums up to 16 |
| // components the |
| // S98aabb0123 selector has invalid |
| // swizzle size (there is no int10)</code></pre> |
| </div> |
| </div> |
| </li> |
| <li> |
| <p><em>vector-swizzle-selector</em>, in a form of <em>vector-swizzle-xyzw-selector</em>, <em>vector-swizzle-rgba-selector</em> or <em>vector-swizzle-num-selector</em> can specify multiple values. |
| Each value selects single component. |
| Values in a selector can be repeated and specified in any order. |
| A number of values in a selector including repeated values is called the swizzle size.</p> |
| <table id="selector_values_and_their_corresponding_components_in_swizzle" class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 6. Selector values and their corresponding components in swizzle</caption> |
| <colgroup> |
| <col style="width: 25%;"> |
| <col style="width: 25%;"> |
| <col style="width: 25%;"> |
| <col style="width: 25%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top"><strong>Selector</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Selector value</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Selected component</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Required number of components in vector expression</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-xyzw-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>x</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1<sup>st</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2, 3 or 4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-xyzw-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>y</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2<sup>nd</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2, 3 or 4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-xyzw-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>z</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3<sup>rd</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3 or 4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-xyzw-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>w</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-rgba-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>r</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1<sup>st</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2, 3 or 4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-rgba-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>g</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2<sup>nd</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2, 3 or 4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-rgba-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>b</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3<sup>rd</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3 or 4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-rgba-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>a</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>0</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1<sup>st</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2, 3, 4, 8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>1</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2<sup>nd</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2, 3, 4, 8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>2</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3<sup>rd</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3, 4, 8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>3</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4, 8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>4</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">5<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>5</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">6<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>6</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">7<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>7</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8 or 16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>8</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">9<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>9</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">10<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>a</code> or <code>A</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">11<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>b</code> or <code>B</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">12<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>c</code> or <code>C</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">13<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>d</code> or <code>D</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">14<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>e</code> or <code>E</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">15<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><em>vector-swizzle-num-selector</em></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>f</code> or <code>F</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16<sup>th</sup></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li> |
| <p><em>vector-swizzle-selector</em> in a form of <em>vector-swizzle-special-selector</em> shall select:</p> |
| <div class="openblock"> |
| <div class="content"> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>if number of components in vector expression is 3, the same components as if number of components of the vector expression was 4 and the 4-th component was undefined.</p> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| If 4-th component is read, the returned value is undefined; all writes to 4-th component shall be discarded. |
| </td> |
| </tr> |
| </table> |
| </div> |
| </li> |
| <li> |
| <p>otherwise, half of components of <em>vector expression</em> with</p> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><code>hi</code> - highest numerical selector values in ascending order (higher half of the vector)</p> |
| </li> |
| <li> |
| <p><code>lo</code> - lowest numerical selector values in ascending order (lower half of the vector)</p> |
| </li> |
| <li> |
| <p><code>even</code> - even numerical selector values in ascending order</p> |
| </li> |
| <li> |
| <p><code>odd</code> - odd numerical selector values in ascending order</p> |
| </li> |
| </ul> |
| </div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>The following <a href="#special_selector_values">Special selector values</a> table describes special selector values and their numerical equivalents.</p> |
| </div> |
| <table id="special_selector_values" class="tableblock frame-all grid-all stretch"> |
| <caption class="title">Table 7. Special selector values</caption> |
| <colgroup> |
| <col style="width: 25%;"> |
| <col style="width: 25%;"> |
| <col style="width: 25%;"> |
| <col style="width: 25%;"> |
| </colgroup> |
| <thead> |
| <tr> |
| <th class="tableblock halign-left valign-top"><strong>Number of components in vector expression</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Selector value</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Equivalent numerical selector</strong></th> |
| <th class="tableblock halign-left valign-top"><strong>Number of components in result vector swizzle (swizzle size)</strong></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>hi</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s1</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>hi</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s2?</code> <a href="#ftn3">[3]</a></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>hi</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s23</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>hi</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s4567</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>hi</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s89abcdef</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>lo</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s0</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>lo</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s01</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>lo</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s01</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>lo</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s0123</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>lo</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s01234567</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>even</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s0</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>even</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s02</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>even</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s02</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>even</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s0246</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">16</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>even</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s02468ace</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>odd</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s1</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">3</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>odd</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s1?</code> <a href="#ftn3">[3]</a></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>odd</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s13</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">8</p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>odd</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock"><code>s1357</code></p></td> |
| <td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td> |
| </tr> |
| <tr> |
| <td class="tableblock halign-left valign-top"><p |
