103 lines
7.4 KiB
HTML
103 lines
7.4 KiB
HTML
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<title>std::experimental::simd_abi::fixed_size</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_experimental_simd_fixed_size skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::experimental::simd_abi::</span>fixed_size</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-experimental.html">experimental</a>‎ | <a href="cpp-experimental-simd.html">simd</a></span></div>
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<div>定义于头文件 <code><a href="https://zh.cppreference.com/mwiki/index.php?title=cpp/header/experimental/simd&action=edit&redlink=1" class="new" title="cpp/header/experimental/simd（页面不存在）"><experimental/simd></a></code></div>
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<tr class="t-dcl t-since-parallelism_ts_2">
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<div><span class="mw-geshi cpp source-cpp"><span class="kw1">template</span> <span class="sy1"><</span> <span class="kw4">int</span> N <span class="sy1">></span><br />
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<span class="kw1">struct</span> fixed_size <span class="br0">{</span><span class="br0">}</span><span class="sy4">;</span></span></div>
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<td><span class="t-mark-rev t-since-parallelism-ts-2 t-mark-ts">(并行 TS v2)</span></td>
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<p><span class="t-c"><span class="mw-geshi cpp source-cpp">simd_abi<span class="sy4">::</span><span class="me2">fixed_size</span><span class="sy1"><</span>N<span class="sy1">></span></span></span> 标签类型确保数据并行类型存储并操纵 N 个元素（即 <span class="t-c"><span class="mw-geshi cpp source-cpp">simd<span class="sy1"><</span>T, simd_abi<span class="sy4">::</span><span class="me2">fixed_size</span><span class="sy1"><</span>N<span class="sy1">>></span><span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 返回 N ）。实现应当支持至少全部 N ∈ [1 … 32] 。另外，对于每个受支持的 <span class="t-c"><span class="mw-geshi cpp source-cpp">simd<span class="sy1"><</span>T, Abi<span class="sy1">></span></span></span> ，其中 Abi 是实现定义的 ABI 标签，应当支持 N = <span class="t-c"><span class="mw-geshi cpp source-cpp">simd<span class="sy1"><</span>T, Abi<span class="sy1">></span><span class="sy4">::</span><span class="me2">size</span><span class="br0">(</span><span class="br0">)</span></span></span> 。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>实现可以选择对使用相同 <span class="t-c"><span class="mw-geshi cpp source-cpp">simd_abi<span class="sy4">::</span><span class="me2">fixed_size</span><span class="sy1"><</span>N<span class="sy1">></span></span></span> 标签的 <code>simd</code> 和 <code>simd_mask</code> 实例化放弃不同翻译单元间的 ABI 兼容性。否则， <span class="t-c"><span class="mw-geshi cpp source-cpp">simd<span class="sy1"><</span>T, Abi<span class="sy1">></span></span></span> 的效率可能优于 <span class="t-c"><span class="mw-geshi cpp source-cpp">simd<span class="sy1"><</span>T, fixed_size<span class="sy1"><</span>simd_size_v<span class="sy1"><</span>T, Abi<span class="sy1">>>></span></span></span> （其中 Abi 不是 <span class="t-c"><span class="mw-geshi cpp source-cpp">simd_abi<span class="sy4">::</span><span class="me2">fixed_size</span></span></span> 的实例）。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div><a href="cpp-experimental-simd-max_fixed_size.html"><span class="t-lines"><span>max_fixed_size</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-parallelism-ts-2 t-mark-ts">(并行 TS v2)</span></span></span></div>
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</div>
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</td>
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<td>保证支持的固定最大元素数<br />
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<span class="t-mark">(常量)</span></td>
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<div><a href="cpp-experimental-simd-scalar.html"><span class="t-lines"><span>scalar</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-parallelism-ts-2 t-mark-ts">(并行 TS v2)</span></span></span></div>
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</div>
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</td>
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<td>存储单个元素的标签类型<br />
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<span class="t-mark">(typedef)</span></td>
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<div><a href="cpp-experimental-simd-compatible.html"><span class="t-lines"><span>compatible</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-parallelism-ts-2 t-mark-ts">(并行 TS v2)</span></span></span></div>
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</td>
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<td>确保 ABI 兼容性的标签类型<br />
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<span class="t-mark">(别名模板)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-simd-native.html"><span class="t-lines"><span>native</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-parallelism-ts-2 t-mark-ts">(并行 TS v2)</span></span></span></div>
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</div>
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</td>
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<td>最有效率的标签类型<br />
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<span class="t-mark">(别名模板)</span></td>
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</tr>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-experimental-simd-deduce.html"><span class="t-lines"><span>deduce</span><span>deduce_t</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-parallelism-ts-2 t-mark-ts">(并行 TS v2)</span></span></span></div>
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</div>
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</td>
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<td>获得给定的元素类型及元素数的 ABI 类型<br />
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<span class="t-mark">(类模板)</span></td>
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</table>
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</div>
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<div class="visualClear"></div>
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