| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/httparse-1.8.0/src/simd/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../httparse/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../httparse/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="attribute">#[cfg(not(all( |
| httparse_simd, |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| )))] |
| </span><span class="kw">mod </span>fallback; |
| |
| <span class="attribute">#[cfg(not(all( |
| httparse_simd, |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| )))] |
| </span><span class="kw">pub use </span><span class="self">self</span>::fallback::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">mod </span>sse42; |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| any( |
| httparse_simd_target_feature_avx2, |
| not(httparse_simd_target_feature_sse42), |
| ), |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">mod </span>avx2; |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">pub const </span>SSE_42: usize = <span class="number">1</span>; |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| any(not(httparse_simd_target_feature_sse42), httparse_simd_target_feature_avx2), |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">pub const </span>AVX_2: usize = <span class="number">2</span>; |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| any( |
| not(httparse_simd_target_feature_sse42), |
| httparse_simd_target_feature_avx2, |
| test, |
| ), |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">pub const </span>AVX_2_AND_SSE_42: usize = <span class="number">3</span>; |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">const </span>NONE: usize = std::usize::MAX; |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| not(any( |
| httparse_simd_target_feature_sse42, |
| httparse_simd_target_feature_avx2, |
| )), |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">mod </span>runtime { |
| <span class="doccomment">//! Runtime detection of simd features. Used when the build script |
| //! doesn't notice any target features at build time. |
| //! |
| //! While `is_x86_feature_detected!` has it's own caching built-in, |
| //! at least in 1.27.0, the functions don't inline, leaving using it |
| //! actually *slower* than just using the scalar fallback. |
| |
| </span><span class="kw">use </span>core::sync::atomic::{AtomicUsize, Ordering}; |
| |
| <span class="kw">static </span>FEATURE: AtomicUsize = AtomicUsize::new(<span class="number">0</span>); |
| |
| <span class="kw">const </span>INIT: usize = <span class="number">0</span>; |
| |
| <span class="kw">pub fn </span>detect() -> usize { |
| <span class="kw">let </span>feat = FEATURE.load(Ordering::Relaxed); |
| <span class="kw">if </span>feat == INIT { |
| <span class="kw">if </span><span class="macro">cfg!</span>(target_arch = <span class="string">"x86_64"</span>) && <span class="macro">is_x86_feature_detected!</span>(<span class="string">"avx2"</span>) { |
| <span class="kw">if </span><span class="macro">is_x86_feature_detected!</span>(<span class="string">"sse4.2"</span>) { |
| FEATURE.store(<span class="kw">super</span>::AVX_2_AND_SSE_42, Ordering::Relaxed); |
| <span class="kw">return </span><span class="kw">super</span>::AVX_2_AND_SSE_42; |
| } <span class="kw">else </span>{ |
| FEATURE.store(<span class="kw">super</span>::AVX_2, Ordering::Relaxed); |
| <span class="kw">return </span><span class="kw">super</span>::AVX_2; |
| } |
| } <span class="kw">else if </span><span class="macro">is_x86_feature_detected!</span>(<span class="string">"sse4.2"</span>) { |
| FEATURE.store(<span class="kw">super</span>::SSE_42, Ordering::Relaxed); |
| <span class="kw">return </span><span class="kw">super</span>::SSE_42; |
| } <span class="kw">else </span>{ |
| FEATURE.store(<span class="kw">super</span>::NONE, Ordering::Relaxed); |
| } |
| } |
| feat |
| } |
| |
| <span class="kw">pub fn </span>match_uri_vectored(bytes: <span class="kw-2">&mut </span><span class="kw">crate</span>::iter::Bytes) { |
| <span class="kw">unsafe </span>{ |
| <span class="kw">match </span>detect() { |
| <span class="kw">super</span>::SSE_42 => <span class="kw">super</span>::sse42::parse_uri_batch_16(bytes), |
| <span class="kw">super</span>::AVX_2 => { <span class="kw">super</span>::avx2::parse_uri_batch_32(bytes); }, |
| <span class="kw">super</span>::AVX_2_AND_SSE_42 => { |
| <span class="kw">if let </span><span class="kw">super</span>::avx2::Scan::Found = <span class="kw">super</span>::avx2::parse_uri_batch_32(bytes) { |
| <span class="kw">return</span>; |
| } |
| <span class="kw">super</span>::sse42::parse_uri_batch_16(bytes) |
| }, |
| <span class="kw">_ </span>=> () |
| } |
| } |
| |
| <span class="comment">// else do nothing |
| </span>} |
| |
| <span class="kw">pub fn </span>match_header_value_vectored(bytes: <span class="kw-2">&mut </span><span class="kw">crate</span>::iter::Bytes) { |
| <span class="kw">unsafe </span>{ |
| <span class="kw">match </span>detect() { |
| <span class="kw">super</span>::SSE_42 => <span class="kw">super</span>::sse42::match_header_value_batch_16(bytes), |
| <span class="kw">super</span>::AVX_2 => { <span class="kw">super</span>::avx2::match_header_value_batch_32(bytes); }, |
| <span class="kw">super</span>::AVX_2_AND_SSE_42 => { |
| <span class="kw">if let </span><span class="kw">super</span>::avx2::Scan::Found = <span class="kw">super</span>::avx2::match_header_value_batch_32(bytes) { |
| <span class="kw">return</span>; |
| } |
| <span class="kw">super</span>::sse42::match_header_value_batch_16(bytes) |
| }, |
| <span class="kw">_ </span>=> () |
| } |
| } |
| |
| <span class="comment">// else do nothing |
| </span>} |
| } |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| not(any( |
| httparse_simd_target_feature_sse42, |
| httparse_simd_target_feature_avx2, |
| )), |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">pub use </span><span class="self">self</span>::runtime::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| httparse_simd_target_feature_sse42, |
| not(httparse_simd_target_feature_avx2), |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">mod </span>sse42_compile_time { |
| <span class="kw">pub fn </span>match_uri_vectored(bytes: <span class="kw-2">&mut </span><span class="kw">crate</span>::iter::Bytes) { |
| <span class="kw">if </span>detect() == <span class="kw">super</span>::SSE_42 { |
| <span class="kw">unsafe </span>{ |
| <span class="kw">super</span>::sse42::parse_uri_batch_16(bytes); |
| } |
| } |
| |
| <span class="comment">// else do nothing |
| </span>} |
| |
| <span class="kw">pub fn </span>match_header_value_vectored(bytes: <span class="kw-2">&mut </span><span class="kw">crate</span>::iter::Bytes) { |
| <span class="kw">if </span>detect() == <span class="kw">super</span>::SSE_42 { |
| <span class="kw">unsafe </span>{ |
| <span class="kw">super</span>::sse42::match_header_value_batch_16(bytes); |
| } |
| } |
| |
| <span class="comment">// else do nothing |
| </span>} |
| |
| <span class="kw">pub fn </span>detect() -> usize { |
| <span class="kw">if </span><span class="macro">is_x86_feature_detected!</span>(<span class="string">"sse4.2"</span>) { |
| <span class="kw">super</span>::SSE_42 |
| } <span class="kw">else </span>{ |
| <span class="kw">super</span>::NONE |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| httparse_simd_target_feature_sse42, |
| not(httparse_simd_target_feature_avx2), |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">pub use </span><span class="self">self</span>::sse42_compile_time::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| httparse_simd_target_feature_avx2, |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">mod </span>avx2_compile_time { |
| <span class="kw">pub fn </span>match_uri_vectored(bytes: <span class="kw-2">&mut </span><span class="kw">crate</span>::iter::Bytes) { |
| <span class="comment">// do both, since avx2 only works when bytes.len() >= 32 |
| </span><span class="kw">if </span>detect() == <span class="kw">super</span>::AVX_2_AND_SSE_42 { |
| <span class="kw">unsafe </span>{ |
| <span class="kw">super</span>::avx2::parse_uri_batch_32(bytes); |
| } |
| |
| } |
| <span class="kw">if </span>detect() == <span class="kw">super</span>::SSE_42 { |
| <span class="kw">unsafe </span>{ |
| <span class="kw">super</span>::sse42::parse_uri_batch_16(bytes); |
| } |
| } |
| |
| <span class="comment">// else do nothing |
| </span>} |
| |
| <span class="kw">pub fn </span>match_header_value_vectored(bytes: <span class="kw-2">&mut </span><span class="kw">crate</span>::iter::Bytes) { |
| <span class="comment">// do both, since avx2 only works when bytes.len() >= 32 |
| </span><span class="kw">if </span>detect() == <span class="kw">super</span>::AVX_2_AND_SSE_42 { |
| <span class="kw">let </span>scanned = <span class="kw">unsafe </span>{ |
| <span class="kw">super</span>::avx2::match_header_value_batch_32(bytes) |
| }; |
| |
| <span class="kw">if let </span><span class="kw">super</span>::avx2::Scan::Found = scanned { |
| <span class="kw">return</span>; |
| } |
| } |
| <span class="kw">if </span>detect() == <span class="kw">super</span>::SSE_42 { |
| <span class="kw">unsafe </span>{ |
| <span class="kw">super</span>::sse42::match_header_value_batch_16(bytes); |
| } |
| } |
| |
| <span class="comment">// else do nothing |
| </span>} |
| |
| <span class="kw">pub fn </span>detect() -> usize { |
| <span class="kw">if </span><span class="macro">cfg!</span>(target_arch = <span class="string">"x86_64"</span>) && <span class="macro">is_x86_feature_detected!</span>(<span class="string">"avx2"</span>) { |
| <span class="kw">super</span>::AVX_2_AND_SSE_42 |
| } <span class="kw">else if </span><span class="macro">is_x86_feature_detected!</span>(<span class="string">"sse4.2"</span>) { |
| <span class="kw">super</span>::SSE_42 |
| } <span class="kw">else </span>{ |
| <span class="kw">super</span>::NONE |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(all( |
| httparse_simd, |
| httparse_simd_target_feature_avx2, |
| any( |
| target_arch = <span class="string">"x86"</span>, |
| target_arch = <span class="string">"x86_64"</span>, |
| ), |
| ))] |
| </span><span class="kw">pub use </span><span class="self">self</span>::avx2_compile_time::<span class="kw-2">*</span>; |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="httparse" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
