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</pre><pre class="rust ">
<span class="doccomment">//! Run-time feature detection on ARM Aarch32.</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">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">is_arm_feature_detected</span> {
(<span class="string">"neon"</span>) <span class="op">=></span> {
<span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_feature</span> <span class="op">=</span> <span class="string">"neon"</span>) <span class="op">||</span>
<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">arch</span>::<span class="ident">detect</span>::<span class="ident">check_for</span>(<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">arch</span>::<span class="ident">detect</span>::<span class="ident">Feature</span>::<span class="ident">neon</span>)
};
(<span class="string">"pmull"</span>) <span class="op">=></span> {
<span class="macro">cfg</span><span class="macro">!</span>(<span class="ident">target_feature</span> <span class="op">=</span> <span class="string">"pmull"</span>) <span class="op">||</span>
<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">arch</span>::<span class="ident">detect</span>::<span class="ident">check_for</span>(<span class="macro-nonterminal">$</span><span class="kw">crate</span>::<span class="macro-nonterminal">arch</span>::<span class="ident">detect</span>::<span class="ident">Feature</span>::<span class="ident">pmull</span>)
};
(<span class="string">"v7"</span>) <span class="op">=></span> { <span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">"\"v7\" feature cannot be detected at run-time"</span>) };
(<span class="string">"vfp2"</span>) <span class="op">=></span> { <span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">"\"vfp2\" feature cannot be detected at run-time"</span>) };
(<span class="string">"vfp3"</span>) <span class="op">=></span> { <span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">"\"vfp3\" feature cannot be detected at run-time"</span>) };
(<span class="string">"vfp4"</span>) <span class="op">=></span> { <span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">"\"vfp4\" feature cannot be detected at run-time"</span>) };
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>:<span class="ident">tt</span>) <span class="op">=></span> { <span class="macro">compile_error</span><span class="macro">!</span>(<span class="macro">concat</span><span class="macro">!</span>(<span class="string">"unknown arm target feature: "</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">t</span>)) };
}
<span class="doccomment">/// ARM CPU Feature enum. Each variant denotes a position in a bitset for a</span>
<span class="doccomment">/// particular feature.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// PLEASE: do not use this, it is an implementation detail subject to change.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">non_camel_case_types</span>)]</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">u8</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Feature</span> {
<span class="doccomment">/// ARM Advanced SIMD (NEON) - Aarch32</span>
<span class="ident">neon</span>,
<span class="doccomment">/// Polynomial Multiply</span>
<span class="ident">pmull</span>,
}
</pre>
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