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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `dgemm` fn in crate `matrixmultiply`."><meta name="keywords" content="rust, rustlang, rust-lang, dgemm"><title>matrixmultiply::dgemm - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../matrixmultiply/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>matrixmultiply</a></p><script>window.sidebarCurrent = {name: 'dgemm', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/matrixmultiply/gemm.rs.html#74-88' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='index.html'>matrixmultiply</a>::<wbr><a class="fn" href=''>dgemm</a></span></h1><pre class='rust fn'>pub unsafe fn dgemm(<br> m: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> k: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> n: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> alpha: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>, <br> a: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const </a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>, <br> rsa: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>, <br> csa: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>, <br> b: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*const </a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>, <br> rsb: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>, <br> csb: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>, <br> beta: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>, <br> c: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.pointer.html">*mut </a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a>, <br> rsc: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a>, <br> csc: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.isize.html">isize</a><br>)</pre><div class='docblock'><p>General matrix multiplication (f64)</p>
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<p>C ← α A B + β C</p>
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<ul>
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<li>m, k, n: dimensions</li>
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<li>a, b, c: pointer to the first element in the matrix</li>
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<li>A: m by k matrix</li>
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<li>B: k by n matrix</li>
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<li>C: m by n matrix</li>
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<li>rs<em>x</em>: row stride of <em>x</em></li>
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<li>cs<em>x</em>: col stride of <em>x</em></li>
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</ul>
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<p>Strides for A and B may be arbitrary. Strides for C must not result in
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elements that alias each other, for example they can not be zero.</p>
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<p>If β is zero, then C does not need to be initialized.</p>
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