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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="Source to the Rust file `libstd/../stdsimd/stdsimd/arch/detect/error_macros.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>error_macros.rs.html -- source</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><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[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">&#9776;</div><a href='../../../../../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></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"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><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"><pre class="line-numbers"><span id="1">  1</span>
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</pre><pre class="rust ">
<span class="doccomment">//! The `is_{target_arch}_feature_detected!` macro are only available on their</span>
<span class="doccomment">//! architecture. These macros provide a better error messages when the user</span>
<span class="doccomment">//! attempts to call them in a different architecture.</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">any</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86&quot;</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;x86_64&quot;</span>)))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;stdsimd&quot;</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_x86_feature_detected</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">tt</span>) <span class="op">=&gt;</span> {
        <span class="macro">compile_error</span><span class="macro">!</span>(
            <span class="string">r#&quot;
        is_x86_feature_detected can only be used on x86 and x86_64 targets.
        You can prevent it from being used in other architectures by
        guarding it behind a cfg(target_arch) as follows:
            
            #[cfg(any(target_arch = &quot;x86&quot;, target_arch = &quot;x86_64&quot;))] {
                if is_x86_feature_detected(...) { ... }
            }
        &quot;#</span>
        )
    };
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;arm&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;stdsimd&quot;</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_arm_feature_detected</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">tt</span>) <span class="op">=&gt;</span> {
        <span class="macro">compile_error</span><span class="macro">!</span>(
            <span class="string">r#&quot;
        is_arm_feature_detected can only be used on ARM targets.
        You can prevent it from being used in other architectures by
        guarding it behind a cfg(target_arch) as follows:
            
            #[cfg(target_arch = &quot;arm&quot;)] {
                if is_arm_feature_detected(...) { ... }
            }
        &quot;#</span>
        )
    };
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;aarch64&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;stdsimd&quot;</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_aarch64_feature_detected</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">tt</span>) <span class="op">=&gt;</span> {
        <span class="macro">compile_error</span><span class="macro">!</span>(
            <span class="string">r#&quot;
        is_aarch64_feature_detected can only be used on AArch64 targets.
        You can prevent it from being used in other architectures by
        guarding it behind a cfg(target_arch) as follows:
            
            #[cfg(target_arch = &quot;aarch64&quot;)] {
                if is_aarch64_feature_detected(...) { ... }
            }
        &quot;#</span>
        )
    };
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;powerpc64&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;stdsimd&quot;</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_powerpc64_feature_detected</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=&gt;</span> {
        <span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">r#&quot;
is_powerpc64_feature_detected can only be used on PowerPC64 targets.
You can prevent it from being used in other architectures by
guarding it behind a cfg(target_arch) as follows:

    #[cfg(target_arch = &quot;powerpc64&quot;)] {
        if is_powerpc64_feature_detected(...) { ... }
    }
&quot;#</span>)
    };
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;mips&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;stdsimd&quot;</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_mips_feature_detected</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">tt</span>) <span class="op">=&gt;</span> {
        <span class="macro">compile_error</span><span class="macro">!</span>(
            <span class="string">r#&quot;
        is_mips_feature_detected can only be used on MIPS targets.
        You can prevent it from being used in other architectures by
        guarding it behind a cfg(target_arch) as follows:
            
            #[cfg(target_arch = &quot;mips&quot;)] {
                if is_mips_feature_detected(...) { ... }
            }
        &quot;#</span>
        )
    };
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;mips64&quot;</span>))]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;stdsimd&quot;</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_mips64_feature_detected</span> {
    (<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>: <span class="ident">tt</span>) <span class="op">=&gt;</span> {
        <span class="macro">compile_error</span><span class="macro">!</span>(
            <span class="string">r#&quot;
        is_mips64_feature_detected can only be used on MIPS64 targets.
        You can prevent it from being used in other architectures by
        guarding it behind a cfg(target_arch) as follows:
            
            #[cfg(target_arch = &quot;mips64&quot;)] {
                if is_mips64_feature_detected(...) { ... }
            }
        &quot;#</span>
        )
    };
}
</pre>
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