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+<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Compiler · Metal.jl</title><meta name="title" content="Compiler · Metal.jl"/><meta property="og:title" content="Compiler · Metal.jl"/><meta property="twitter:title" content="Compiler · Metal.jl"/><meta name="description" content="Documentation for Metal.jl."/><meta property="og:description" content="Documentation for Metal.jl."/><meta property="twitter:description" content="Documentation for Metal.jl."/><meta property="og:url" content="https://metal.juliagpu.org/stable/api/compiler/"/><meta property="twitter:url" content="https://metal.juliagpu.org/stable/api/compiler/"/><link rel="canonical" href="https://metal.juliagpu.org/stable/api/compiler/"/><script data-outdated-warner src="../../assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link 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type="image/x-icon"/></head><body><div id="documenter"><nav class="docs-sidebar"><a class="docs-logo" href="../../"><img src="../../assets/logo.png" alt="Metal.jl logo"/></a><div class="docs-package-name"><span class="docs-autofit"><a href="../../">Metal.jl</a></span></div><button class="docs-search-query input is-rounded is-small is-clickable my-2 mx-auto py-1 px-2" id="documenter-search-query">Search docs (Ctrl + /)</button><ul class="docs-menu"><li><a class="tocitem" href="../../">Home</a></li><li><span class="tocitem">Usage</span><ul><li><a class="tocitem" href="../../usage/overview/">Overview</a></li><li><a class="tocitem" href="../../usage/array/">Array programming</a></li><li><a class="tocitem" href="../../usage/kernel/">Kernel programming</a></li></ul></li><li><a class="tocitem" href="../../profiling/">Profiling</a></li><li><span class="tocitem">API reference</span><ul><li><a class="tocitem" href="../essentials/">Essentials</a></li><li class="is-active"><a class="tocitem" href>Compiler</a><ul class="internal"><li><a class="tocitem" href="#Execution"><span>Execution</span></a></li><li><a class="tocitem" href="#Reflection"><span>Reflection</span></a></li></ul></li><li><a class="tocitem" href="../kernel/">Kernel programming</a></li><li><a class="tocitem" href="../array/">Array programming</a></li><li><a class="tocitem" href="../mps/">Metal Performance Shaders</a></li></ul></li><li><span class="tocitem">FAQ</span><ul><li><a class="tocitem" href="../../faq/faq/">Frequently Asked Questions</a></li><li><a class="tocitem" href="../../faq/contributing/">Contributing</a></li></ul></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><a class="docs-sidebar-button docs-navbar-link fa-solid fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a><nav class="breadcrumb"><ul class="is-hidden-mobile"><li><a class="is-disabled">API reference</a></li><li class="is-active"><a href>Compiler</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href>Compiler</a></li></ul></nav><div class="docs-right"><a class="docs-navbar-link" href="https://github.com/JuliaGPU/Metal.jl/blob/main/docs/src/api/compiler.md#" title="Edit source on GitHub"><span class="docs-icon fa-solid"></span></a><a class="docs-settings-button docs-navbar-link fa-solid fa-gear" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-article-toggle-button fa-solid fa-chevron-up" id="documenter-article-toggle-button" href="javascript:;" title="Collapse all docstrings"></a></div></header><article class="content" id="documenter-page"><h1 id="Compiler"><a class="docs-heading-anchor" href="#Compiler">Compiler</a><a id="Compiler-1"></a><a class="docs-heading-anchor-permalink" href="#Compiler" title="Permalink"></a></h1><h2 id="Execution"><a class="docs-heading-anchor" href="#Execution">Execution</a><a id="Execution-1"></a><a class="docs-heading-anchor-permalink" href="#Execution" title="Permalink"></a></h2><p>The main entry-point to the compiler is the <code>@metal</code> macro:</p><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="Metal.@metal" href="#Metal.@metal"><code>Metal.@metal</code></a> — <span class="docstring-category">Macro</span></header><section><div><pre><code class="language-julia hljs">@metal threads=... groups=... [kwargs...] func(args...)</code></pre><p>High-level interface for executing code on a GPU.</p><p>The <code>@metal</code> macro should prefix a call, with <code>func</code> a callable function or object that should return nothing. It will be compiled to a Metal function upon first use, and to a certain extent arguments will be converted and managed automatically using <code>mtlconvert</code>. Finally, a call to <code>mtlcall</code> is performed, creating a command buffer in the current global command queue then committing it.</p><p>There is one supported keyword argument that influences the behavior of <code>@metal</code>:</p><ul><li><code>launch</code>: whether to launch this kernel, defaults to <code>true</code>. If <code>false</code> the returned kernel object should be launched by calling it and passing arguments again.</li><li><code>name</code>: the name of the kernel in the generated code. Defaults to an automatically- generated name.</li><li><code>queue</code>: the command queue to use for this kernel. Defaults to the global command queue.</li></ul></div><a class="docs-sourcelink" target="_blank" href="https://github.com/JuliaGPU/Metal.jl/blob/81aca2a039b8fe9153611dbdf8bac31545c0ccbe/src/compiler/execution.jl#L10-L28">source</a></section></article><p>If needed, you can use a lower-level API that lets you inspect the compiler kernel:</p><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="Metal.mtlconvert" href="#Metal.mtlconvert"><code>Metal.mtlconvert</code></a> — <span class="docstring-category">Function</span></header><section><div><p>mtlconvert(x, [cce])</p><p>This function is called for every argument to be passed to a kernel, allowing it to be converted to a GPU-friendly format. By default, the function does nothing and returns the input object <code>x</code> as-is.</p><p>Do not add methods to this function, but instead extend the underlying Adapt.jl package and register methods for the the <code>Metal.Adaptor</code> type.</p></div><a class="docs-sourcelink" target="_blank" href="https://github.com/JuliaGPU/Metal.jl/blob/81aca2a039b8fe9153611dbdf8bac31545c0ccbe/src/compiler/execution.jl#L146-L155">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="Metal.mtlfunction" href="#Metal.mtlfunction"><code>Metal.mtlfunction</code></a> — <span class="docstring-category">Function</span></header><section><div><pre><code class="language-julia hljs">mtlfunction(f, tt=Tuple{}; kwargs...)</code></pre><p>Low-level interface to compile a function invocation for the currently-active GPU, returning a callable kernel object. For a higher-level interface, use <a href="#Metal.@metal"><code>@metal</code></a>.</p><p>The output of this function is automatically cached, i.e. you can simply call <code>mtlfunction</code> in a hot path without degrading performance. New code will be generated automatically when the function changes, or when different types or keyword arguments are provided.</p></div><a class="docs-sourcelink" target="_blank" href="https://github.com/JuliaGPU/Metal.jl/blob/81aca2a039b8fe9153611dbdf8bac31545c0ccbe/src/compiler/execution.jl#L168-L177">source</a></section></article><h2 id="Reflection"><a class="docs-heading-anchor" href="#Reflection">Reflection</a><a id="Reflection-1"></a><a class="docs-heading-anchor-permalink" href="#Reflection" title="Permalink"></a></h2><p>If you want to inspect generated code, you can use macros that resemble functionality from the InteractiveUtils standard library:</p><pre><code class="nohighlight hljs">@device_code_lowered
+@device_code_typed
+@device_code_warntype
+@device_code_llvm
+@device_code_native
+@device_code_agx
+@device_code</code></pre><p>For more information, please consult the GPUCompiler.jl documentation. <code>code_agx</code> is actually <code>code_native</code>:</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="../essentials/">« Essentials</a><a class="docs-footer-nextpage" href="../kernel/">Kernel programming »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="auto">Automatic (OS)</option><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option><option value="catppuccin-latte">catppuccin-latte</option><option value="catppuccin-frappe">catppuccin-frappe</option><option value="catppuccin-macchiato">catppuccin-macchiato</option><option value="catppuccin-mocha">catppuccin-mocha</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 1.5.0 on <span class="colophon-date" title="Tuesday 27 August 2024 17:09">Tuesday 27 August 2024</span>. Using Julia version 1.10.4.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>
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