| <!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/encoding_rs-0.8.32/src/ascii.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ascii.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="../../encoding_rs/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="../../encoding_rs/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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| <span id="1546">1546</span> |
| </pre><pre class="rust"><code><span class="comment">// Copyright Mozilla Foundation. See the COPYRIGHT |
| // file at the top-level directory of this distribution. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // https://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| // It's assumed that in due course Rust will have explicit SIMD but will not |
| // be good at run-time selection of SIMD vs. no-SIMD. In such a future, |
| // x86_64 will always use SSE2 and 32-bit x86 will use SSE2 when compiled with |
| // a Mozilla-shipped rustc. SIMD support and especially detection on ARM is a |
| // mess. Under the circumstances, it seems to make sense to optimize the ALU |
| // case for ARMv7 rather than x86. Annoyingly, I was unable to get useful |
| // numbers of the actual ARMv7 CPU I have access to, because (thermal?) |
| // throttling kept interfering. Since Raspberry Pi 3 (ARMv8 core but running |
| // ARMv7 code) produced reproducible performance numbers, that's the ARM |
| // computer that this code ended up being optimized for in the ALU case. |
| // Less popular CPU architectures simply get the approach that was chosen based |
| // on Raspberry Pi 3 measurements. The UTF-16 and UTF-8 ALU cases take |
| // different approaches based on benchmarking on Raspberry Pi 3. |
| |
| </span><span class="attribute">#[cfg(all( |
| feature = <span class="string">"simd-accel"</span>, |
| any( |
| target_feature = <span class="string">"sse2"</span>, |
| all(target_endian = <span class="string">"little"</span>, target_arch = <span class="string">"aarch64"</span>), |
| all(target_endian = <span class="string">"little"</span>, target_feature = <span class="string">"neon"</span>) |
| ) |
| ))] |
| </span><span class="kw">use </span><span class="kw">crate</span>::simd_funcs::<span class="kw-2">*</span>; |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(feature = <span class="string">"simd-accel"</span>)] </span>{ |
| <span class="attribute">#[allow(unused_imports)] |
| </span><span class="kw">use </span>::core::intrinsics::unlikely; |
| <span class="attribute">#[allow(unused_imports)] |
| </span><span class="kw">use </span>::core::intrinsics::likely; |
| } <span class="kw">else </span>{ |
| <span class="attribute">#[allow(dead_code)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>unlikely(b: bool) -> bool { |
| b |
| } |
| <span class="attribute">#[allow(dead_code)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>likely(b: bool) -> bool { |
| b |
| } |
| } |
| } |
| |
| <span class="comment">// `as` truncates, so works on 32-bit, too. |
| </span><span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">pub const </span>ASCII_MASK: usize = <span class="number">0x8080_8080_8080_8080u64 </span><span class="kw">as </span>usize; |
| |
| <span class="comment">// `as` truncates, so works on 32-bit, too. |
| </span><span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">pub const </span>BASIC_LATIN_MASK: usize = <span class="number">0xFF80_FF80_FF80_FF80u64 </span><span class="kw">as </span>usize; |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_naive { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$src_unit</span>:ty, <span class="macro-nonterminal">$dst_unit</span>:ty) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>( |
| src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, |
| dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, |
| len: usize, |
| ) -> <span class="prelude-ty">Option</span><(<span class="macro-nonterminal">$src_unit</span>, usize)> { |
| <span class="comment">// Yes, manually omitting the bound check here matters |
| // a lot for perf. |
| </span><span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(i)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, i)); |
| } |
| <span class="kw-2">*</span>(dst.add(i)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| } |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_alu { |
| (<span class="macro-nonterminal">$name</span>:ident, |
| <span class="macro-nonterminal">$src_unit</span>:ty, |
| <span class="macro-nonterminal">$dst_unit</span>:ty, |
| <span class="macro-nonterminal">$stride_fn</span>:ident) => { |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"cargo-clippy"</span>, allow(never_loop, cast_ptr_alignment))] |
| #[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>( |
| src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, |
| dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, |
| len: usize, |
| ) -> <span class="prelude-ty">Option</span><(<span class="macro-nonterminal">$src_unit</span>, usize)> { |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="comment">// This loop is only broken out of as a `goto` forward |
| </span><span class="kw">loop </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>until_alignment = { |
| <span class="comment">// Check if the other unit aligns if we move the narrower unit |
| // to alignment. |
| // if ::core::mem::size_of::<$src_unit>() == ::core::mem::size_of::<$dst_unit>() { |
| // ascii_to_ascii |
| </span><span class="kw">let </span>src_alignment = (src <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK; |
| <span class="kw">let </span>dst_alignment = (dst <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK; |
| <span class="kw">if </span>src_alignment != dst_alignment { |
| <span class="kw">break</span>; |
| } |
| (ALU_ALIGNMENT - src_alignment) & ALU_ALIGNMENT_MASK |
| <span class="comment">// } else if ::core::mem::size_of::<$src_unit>() < ::core::mem::size_of::<$dst_unit>() { |
| // ascii_to_basic_latin |
| // let src_until_alignment = (ALIGNMENT - ((src as usize) & ALIGNMENT_MASK)) & ALIGNMENT_MASK; |
| // if (dst.add(src_until_alignment) as usize) & ALIGNMENT_MASK != 0 { |
| // break; |
| // } |
| // src_until_alignment |
| // } else { |
| // basic_latin_to_ascii |
| // let dst_until_alignment = (ALIGNMENT - ((dst as usize) & ALIGNMENT_MASK)) & ALIGNMENT_MASK; |
| // if (src.add(dst_until_alignment) as usize) & ALIGNMENT_MASK != 0 { |
| // break; |
| // } |
| // dst_until_alignment |
| // } |
| </span>}; |
| <span class="kw">if </span>until_alignment + ALU_STRIDE_SIZE <= len { |
| <span class="comment">// Moving pointers to alignment seems to be a pessimization on |
| // x86_64 for operations that have UTF-16 as the internal |
| // Unicode representation. However, since it seems to be a win |
| // on ARM (tested ARMv7 code running on ARMv8 [rpi3]), except |
| // mixed results when encoding from UTF-16 and since x86 and |
| // x86_64 should be using SSE2 in due course, keeping the move |
| // to alignment here. It would be good to test on more ARM CPUs |
| // and on real MIPS and POWER hardware. |
| </span><span class="kw">while </span>until_alignment != <span class="number">0 </span>{ |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| until_alignment -= <span class="number">1</span>; |
| } |
| <span class="kw">let </span>len_minus_stride = len - ALU_STRIDE_SIZE; |
| <span class="kw">loop </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(num_ascii) = <span class="macro-nonterminal">$stride_fn</span>( |
| src.add(offset) <span class="kw">as </span><span class="kw-2">*const </span>usize, |
| dst.add(offset) <span class="kw">as </span><span class="kw-2">*mut </span>usize, |
| ) { |
| offset += num_ascii; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((<span class="kw-2">*</span>(src.add(offset)), offset)); |
| } |
| offset += ALU_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">break</span>; |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>basic_latin_alu { |
| (<span class="macro-nonterminal">$name</span>:ident, |
| <span class="macro-nonterminal">$src_unit</span>:ty, |
| <span class="macro-nonterminal">$dst_unit</span>:ty, |
| <span class="macro-nonterminal">$stride_fn</span>:ident) => { |
| <span class="attribute">#[cfg_attr( |
| feature = <span class="string">"cargo-clippy"</span>, |
| allow(never_loop, cast_ptr_alignment, cast_lossless) |
| )] |
| #[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>( |
| src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, |
| dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, |
| len: usize, |
| ) -> <span class="prelude-ty">Option</span><(<span class="macro-nonterminal">$src_unit</span>, usize)> { |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="comment">// This loop is only broken out of as a `goto` forward |
| </span><span class="kw">loop </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>until_alignment = { |
| <span class="comment">// Check if the other unit aligns if we move the narrower unit |
| // to alignment. |
| // if ::core::mem::size_of::<$src_unit>() == ::core::mem::size_of::<$dst_unit>() { |
| // ascii_to_ascii |
| // let src_alignment = (src as usize) & ALIGNMENT_MASK; |
| // let dst_alignment = (dst as usize) & ALIGNMENT_MASK; |
| // if src_alignment != dst_alignment { |
| // break; |
| // } |
| // (ALIGNMENT - src_alignment) & ALIGNMENT_MASK |
| // } else |
| </span><span class="kw">if </span>::core::mem::size_of::<<span class="macro-nonterminal">$src_unit</span>>() < ::core::mem::size_of::<<span class="macro-nonterminal">$dst_unit</span>>() { |
| <span class="comment">// ascii_to_basic_latin |
| </span><span class="kw">let </span>src_until_alignment = (ALU_ALIGNMENT |
| - ((src <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK)) |
| & ALU_ALIGNMENT_MASK; |
| <span class="kw">if </span>(dst.wrapping_add(src_until_alignment) <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK |
| != <span class="number">0 |
| </span>{ |
| <span class="kw">break</span>; |
| } |
| src_until_alignment |
| } <span class="kw">else </span>{ |
| <span class="comment">// basic_latin_to_ascii |
| </span><span class="kw">let </span>dst_until_alignment = (ALU_ALIGNMENT |
| - ((dst <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK)) |
| & ALU_ALIGNMENT_MASK; |
| <span class="kw">if </span>(src.wrapping_add(dst_until_alignment) <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK |
| != <span class="number">0 |
| </span>{ |
| <span class="kw">break</span>; |
| } |
| dst_until_alignment |
| } |
| }; |
| <span class="kw">if </span>until_alignment + ALU_STRIDE_SIZE <= len { |
| <span class="comment">// Moving pointers to alignment seems to be a pessimization on |
| // x86_64 for operations that have UTF-16 as the internal |
| // Unicode representation. However, since it seems to be a win |
| // on ARM (tested ARMv7 code running on ARMv8 [rpi3]), except |
| // mixed results when encoding from UTF-16 and since x86 and |
| // x86_64 should be using SSE2 in due course, keeping the move |
| // to alignment here. It would be good to test on more ARM CPUs |
| // and on real MIPS and POWER hardware. |
| </span><span class="kw">while </span>until_alignment != <span class="number">0 </span>{ |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| until_alignment -= <span class="number">1</span>; |
| } |
| <span class="kw">let </span>len_minus_stride = len - ALU_STRIDE_SIZE; |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_fn</span>( |
| src.add(offset) <span class="kw">as </span><span class="kw-2">*const </span>usize, |
| dst.add(offset) <span class="kw">as </span><span class="kw-2">*mut </span>usize, |
| ) { |
| <span class="kw">break</span>; |
| } |
| offset += ALU_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">break</span>; |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>latin1_alu { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$src_unit</span>:ty, <span class="macro-nonterminal">$dst_unit</span>:ty, <span class="macro-nonterminal">$stride_fn</span>:ident) => { |
| <span class="attribute">#[cfg_attr( |
| feature = <span class="string">"cargo-clippy"</span>, |
| allow(never_loop, cast_ptr_alignment, cast_lossless) |
| )] |
| #[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, len: usize) { |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="comment">// This loop is only broken out of as a `goto` forward |
| </span><span class="kw">loop </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>until_alignment = { |
| <span class="kw">if </span>::core::mem::size_of::<<span class="macro-nonterminal">$src_unit</span>>() < ::core::mem::size_of::<<span class="macro-nonterminal">$dst_unit</span>>() { |
| <span class="comment">// unpack |
| </span><span class="kw">let </span>src_until_alignment = (ALU_ALIGNMENT |
| - ((src <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK)) |
| & ALU_ALIGNMENT_MASK; |
| <span class="kw">if </span>(dst.wrapping_add(src_until_alignment) <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK |
| != <span class="number">0 |
| </span>{ |
| <span class="kw">break</span>; |
| } |
| src_until_alignment |
| } <span class="kw">else </span>{ |
| <span class="comment">// pack |
| </span><span class="kw">let </span>dst_until_alignment = (ALU_ALIGNMENT |
| - ((dst <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK)) |
| & ALU_ALIGNMENT_MASK; |
| <span class="kw">if </span>(src.wrapping_add(dst_until_alignment) <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK |
| != <span class="number">0 |
| </span>{ |
| <span class="kw">break</span>; |
| } |
| dst_until_alignment |
| } |
| }; |
| <span class="kw">if </span>until_alignment + ALU_STRIDE_SIZE <= len { |
| <span class="kw">while </span>until_alignment != <span class="number">0 </span>{ |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| until_alignment -= <span class="number">1</span>; |
| } |
| <span class="kw">let </span>len_minus_stride = len - ALU_STRIDE_SIZE; |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_fn</span>( |
| src.add(offset) <span class="kw">as </span><span class="kw-2">*const </span>usize, |
| dst.add(offset) <span class="kw">as </span><span class="kw-2">*mut </span>usize, |
| ); |
| offset += ALU_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">break</span>; |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_simd_check_align { |
| ( |
| <span class="macro-nonterminal">$name</span>:ident, |
| <span class="macro-nonterminal">$src_unit</span>:ty, |
| <span class="macro-nonterminal">$dst_unit</span>:ty, |
| <span class="macro-nonterminal">$stride_both_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_src_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_dst_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_neither_aligned</span>:ident |
| ) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>( |
| src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, |
| dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, |
| len: usize, |
| ) -> <span class="prelude-ty">Option</span><(<span class="macro-nonterminal">$src_unit</span>, usize)> { |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>len_minus_stride = len - SIMD_STRIDE_SIZE; |
| <span class="comment">// XXX Should we first process one stride unconditionally as unaligned to |
| // avoid the cost of the branchiness below if the first stride fails anyway? |
| // XXX Should we just use unaligned SSE2 access unconditionally? It seems that |
| // on Haswell, it would make sense to just use unaligned and not bother |
| // checking. Need to benchmark older architectures before deciding. |
| </span><span class="kw">let </span>dst_masked = (dst <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK; |
| <span class="kw">if </span>((src <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK) == <span class="number">0 </span>{ |
| <span class="kw">if </span>dst_masked == <span class="number">0 </span>{ |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_both_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_src_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">if </span>dst_masked == <span class="number">0 </span>{ |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_dst_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_neither_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_simd_check_align_unrolled { |
| ( |
| <span class="macro-nonterminal">$name</span>:ident, |
| <span class="macro-nonterminal">$src_unit</span>:ty, |
| <span class="macro-nonterminal">$dst_unit</span>:ty, |
| <span class="macro-nonterminal">$stride_both_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_src_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_neither_aligned</span>:ident, |
| <span class="macro-nonterminal">$double_stride_both_aligned</span>:ident, |
| <span class="macro-nonterminal">$double_stride_src_aligned</span>:ident |
| ) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>( |
| src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, |
| dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, |
| len: usize, |
| ) -> <span class="prelude-ty">Option</span><(<span class="macro-nonterminal">$src_unit</span>, usize)> { |
| <span class="kw">let </span>unit_size = ::core::mem::size_of::<<span class="macro-nonterminal">$src_unit</span>>(); |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="comment">// This loop is only broken out of as a goto forward without |
| // actually looping |
| </span><span class="lifetime">'outer</span>: <span class="kw">loop </span>{ |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="comment">// First, process one unaligned |
| </span><span class="kw">if </span>!<span class="macro-nonterminal">$stride_neither_aligned</span>(src, dst) { |
| <span class="kw">break </span><span class="lifetime">'outer</span>; |
| } |
| offset = SIMD_STRIDE_SIZE; |
| |
| <span class="comment">// We have now seen 16 ASCII bytes. Let's guess that |
| // there will be enough more to justify more expense |
| // in the case of non-ASCII. |
| // Use aligned reads for the sake of old microachitectures. |
| </span><span class="kw">let </span>until_alignment = ((SIMD_ALIGNMENT |
| - ((src.add(offset) <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK)) |
| & SIMD_ALIGNMENT_MASK) |
| / unit_size; |
| <span class="comment">// This addition won't overflow, because even in the 32-bit PAE case the |
| // address space holds enough code that the slice length can't be that |
| // close to address space size. |
| // offset now equals SIMD_STRIDE_SIZE, hence times 3 below. |
| </span><span class="kw">if </span>until_alignment + (SIMD_STRIDE_SIZE * <span class="number">3</span>) <= len { |
| <span class="kw">if </span>until_alignment != <span class="number">0 </span>{ |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_neither_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += until_alignment; |
| } |
| <span class="kw">let </span>len_minus_stride_times_two = len - (SIMD_STRIDE_SIZE * <span class="number">2</span>); |
| <span class="kw">let </span>dst_masked = (dst.add(offset) <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK; |
| <span class="kw">if </span>dst_masked == <span class="number">0 </span>{ |
| <span class="kw">loop </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(advance) = |
| <span class="macro-nonterminal">$double_stride_both_aligned</span>(src.add(offset), dst.add(offset)) |
| { |
| offset += advance; |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| offset += SIMD_STRIDE_SIZE * <span class="number">2</span>; |
| <span class="kw">if </span>offset > len_minus_stride_times_two { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="kw">if </span>offset + SIMD_STRIDE_SIZE <= len { |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_both_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break </span><span class="lifetime">'outer</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">loop </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(advance) = |
| <span class="macro-nonterminal">$double_stride_src_aligned</span>(src.add(offset), dst.add(offset)) |
| { |
| offset += advance; |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| offset += SIMD_STRIDE_SIZE * <span class="number">2</span>; |
| <span class="kw">if </span>offset > len_minus_stride_times_two { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="kw">if </span>offset + SIMD_STRIDE_SIZE <= len { |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_src_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break </span><span class="lifetime">'outer</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// At most two iterations, so unroll |
| </span><span class="kw">if </span>offset + SIMD_STRIDE_SIZE <= len { |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_neither_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset + SIMD_STRIDE_SIZE <= len { |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_neither_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| } |
| } |
| } |
| } |
| <span class="kw">break </span><span class="lifetime">'outer</span>; |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>latin1_simd_check_align { |
| ( |
| <span class="macro-nonterminal">$name</span>:ident, |
| <span class="macro-nonterminal">$src_unit</span>:ty, |
| <span class="macro-nonterminal">$dst_unit</span>:ty, |
| <span class="macro-nonterminal">$stride_both_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_src_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_dst_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_neither_aligned</span>:ident |
| ) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, len: usize) { |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>len_minus_stride = len - SIMD_STRIDE_SIZE; |
| <span class="kw">let </span>dst_masked = (dst <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK; |
| <span class="kw">if </span>((src <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK) == <span class="number">0 </span>{ |
| <span class="kw">if </span>dst_masked == <span class="number">0 </span>{ |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_both_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_src_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">if </span>dst_masked == <span class="number">0 </span>{ |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_dst_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_neither_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>latin1_simd_check_align_unrolled { |
| ( |
| <span class="macro-nonterminal">$name</span>:ident, |
| <span class="macro-nonterminal">$src_unit</span>:ty, |
| <span class="macro-nonterminal">$dst_unit</span>:ty, |
| <span class="macro-nonterminal">$stride_both_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_src_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_dst_aligned</span>:ident, |
| <span class="macro-nonterminal">$stride_neither_aligned</span>:ident |
| ) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, len: usize) { |
| <span class="kw">let </span>unit_size = ::core::mem::size_of::<<span class="macro-nonterminal">$src_unit</span>>(); |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span><span class="kw-2">mut </span>until_alignment = ((SIMD_STRIDE_SIZE |
| - ((src <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK)) |
| & SIMD_ALIGNMENT_MASK) |
| / unit_size; |
| <span class="kw">while </span>until_alignment != <span class="number">0 </span>{ |
| <span class="kw-2">*</span>(dst.add(offset)) = <span class="kw-2">*</span>(src.add(offset)) <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| until_alignment -= <span class="number">1</span>; |
| } |
| <span class="kw">let </span>len_minus_stride = len - SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset + SIMD_STRIDE_SIZE * <span class="number">2 </span><= len { |
| <span class="kw">let </span>len_minus_stride_times_two = len_minus_stride - SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>(dst.add(offset) <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK == <span class="number">0 </span>{ |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_both_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="macro-nonterminal">$stride_both_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride_times_two { |
| <span class="kw">break</span>; |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_src_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="macro-nonterminal">$stride_src_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride_times_two { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| } |
| <span class="kw">if </span>offset < len_minus_stride { |
| <span class="macro-nonterminal">$stride_src_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="comment">// On x86_64, this loop autovectorizes but in the pack |
| // case there are instructions whose purpose is to make sure |
| // each u16 in the vector is truncated before packing. However, |
| // since we don't care about saturating behavior of SSE2 packing |
| // when the input isn't Latin1, those instructions are useless. |
| // Unfortunately, using the `assume` intrinsic to lie to the |
| // optimizer doesn't make LLVM omit the trunctation that we |
| // don't need. Possibly this loop could be manually optimized |
| // to do the sort of thing that LLVM does but without the |
| // ANDing the read vectors of u16 with a constant that discards |
| // the high half of each u16. As far as I can tell, the |
| // optimization assumes that doing a SIMD read past the end of |
| // the array is OK. |
| </span><span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_simd_unalign { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$src_unit</span>:ty, <span class="macro-nonterminal">$dst_unit</span>:ty, <span class="macro-nonterminal">$stride_neither_aligned</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>( |
| src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, |
| dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, |
| len: usize, |
| ) -> <span class="prelude-ty">Option</span><(<span class="macro-nonterminal">$src_unit</span>, usize)> { |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>len_minus_stride = len - SIMD_STRIDE_SIZE; |
| <span class="kw">loop </span>{ |
| <span class="kw">if </span>!<span class="macro-nonterminal">$stride_neither_aligned</span>(src.add(offset), dst.add(offset)) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>latin1_simd_unalign { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$src_unit</span>:ty, <span class="macro-nonterminal">$dst_unit</span>:ty, <span class="macro-nonterminal">$stride_neither_aligned</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span><span class="macro-nonterminal">$src_unit</span>, dst: <span class="kw-2">*mut </span><span class="macro-nonterminal">$dst_unit</span>, len: usize) { |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>len_minus_stride = len - SIMD_STRIDE_SIZE; |
| <span class="kw">loop </span>{ |
| <span class="macro-nonterminal">$stride_neither_aligned</span>(src.add(offset), dst.add(offset)); |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw-2">*</span>(src.add(offset)); |
| <span class="kw-2">*</span>(dst.add(offset)) = code_unit <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>; |
| offset += <span class="number">1</span>; |
| } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_to_ascii_simd_stride { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$load</span>:ident, <span class="macro-nonterminal">$store</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span>u8, dst: <span class="kw-2">*mut </span>u8) -> bool { |
| <span class="kw">let </span>simd = <span class="macro-nonterminal">$load</span>(src); |
| <span class="kw">if </span>!simd_is_ascii(simd) { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="macro-nonterminal">$store</span>(dst, simd); |
| <span class="bool-val">true |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_to_ascii_simd_double_stride { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$store</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span>u8, dst: <span class="kw-2">*mut </span>u8) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>first = load16_aligned(src); |
| <span class="kw">let </span>second = load16_aligned(src.add(SIMD_STRIDE_SIZE)); |
| <span class="macro-nonterminal">$store</span>(dst, first); |
| <span class="kw">if </span>unlikely(!simd_is_ascii(first | second)) { |
| <span class="kw">let </span>mask_first = mask_ascii(first); |
| <span class="kw">if </span>mask_first != <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>(mask_first.trailing_zeros() <span class="kw">as </span>usize); |
| } |
| <span class="macro-nonterminal">$store</span>(dst.add(SIMD_STRIDE_SIZE), second); |
| <span class="kw">let </span>mask_second = mask_ascii(second); |
| <span class="kw">return </span><span class="prelude-val">Some</span>(SIMD_STRIDE_SIZE + mask_second.trailing_zeros() <span class="kw">as </span>usize); |
| } |
| <span class="macro-nonterminal">$store</span>(dst.add(SIMD_STRIDE_SIZE), second); |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_to_basic_latin_simd_stride { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$load</span>:ident, <span class="macro-nonterminal">$store</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span>u8, dst: <span class="kw-2">*mut </span>u16) -> bool { |
| <span class="kw">let </span>simd = <span class="macro-nonterminal">$load</span>(src); |
| <span class="kw">if </span>!simd_is_ascii(simd) { |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| <span class="kw">let </span>(first, second) = simd_unpack(simd); |
| <span class="macro-nonterminal">$store</span>(dst, first); |
| <span class="macro-nonterminal">$store</span>(dst.add(<span class="number">8</span>), second); |
| <span class="bool-val">true |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>ascii_to_basic_latin_simd_double_stride { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$store</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span>u8, dst: <span class="kw-2">*mut </span>u16) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>first = load16_aligned(src); |
| <span class="kw">let </span>second = load16_aligned(src.add(SIMD_STRIDE_SIZE)); |
| <span class="kw">let </span>(a, b) = simd_unpack(first); |
| <span class="macro-nonterminal">$store</span>(dst, a); |
| <span class="macro-nonterminal">$store</span>(dst.add(SIMD_STRIDE_SIZE / <span class="number">2</span>), b); |
| <span class="kw">if </span>unlikely(!simd_is_ascii(first | second)) { |
| <span class="kw">let </span>mask_first = mask_ascii(first); |
| <span class="kw">if </span>mask_first != <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>(mask_first.trailing_zeros() <span class="kw">as </span>usize); |
| } |
| <span class="kw">let </span>(c, d) = simd_unpack(second); |
| <span class="macro-nonterminal">$store</span>(dst.add(SIMD_STRIDE_SIZE), c); |
| <span class="macro-nonterminal">$store</span>(dst.add(SIMD_STRIDE_SIZE + (SIMD_STRIDE_SIZE / <span class="number">2</span>)), d); |
| <span class="kw">let </span>mask_second = mask_ascii(second); |
| <span class="kw">return </span><span class="prelude-val">Some</span>(SIMD_STRIDE_SIZE + mask_second.trailing_zeros() <span class="kw">as </span>usize); |
| } |
| <span class="kw">let </span>(c, d) = simd_unpack(second); |
| <span class="macro-nonterminal">$store</span>(dst.add(SIMD_STRIDE_SIZE), c); |
| <span class="macro-nonterminal">$store</span>(dst.add(SIMD_STRIDE_SIZE + (SIMD_STRIDE_SIZE / <span class="number">2</span>)), d); |
| <span class="prelude-val">None |
| </span>} |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>unpack_simd_stride { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$load</span>:ident, <span class="macro-nonterminal">$store</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span>u8, dst: <span class="kw-2">*mut </span>u16) { |
| <span class="kw">let </span>simd = <span class="macro-nonterminal">$load</span>(src); |
| <span class="kw">let </span>(first, second) = simd_unpack(simd); |
| <span class="macro-nonterminal">$store</span>(dst, first); |
| <span class="macro-nonterminal">$store</span>(dst.add(<span class="number">8</span>), second); |
| } |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>basic_latin_to_ascii_simd_stride { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$load</span>:ident, <span class="macro-nonterminal">$store</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span>u16, dst: <span class="kw-2">*mut </span>u8) -> bool { |
| <span class="kw">let </span>first = <span class="macro-nonterminal">$load</span>(src); |
| <span class="kw">let </span>second = <span class="macro-nonterminal">$load</span>(src.add(<span class="number">8</span>)); |
| <span class="kw">if </span>simd_is_basic_latin(first | second) { |
| <span class="macro-nonterminal">$store</span>(dst, simd_pack(first, second)); |
| <span class="bool-val">true |
| </span>} <span class="kw">else </span>{ |
| <span class="bool-val">false |
| </span>} |
| } |
| }; |
| } |
| |
| <span class="attribute">#[allow(unused_macros)] |
| </span><span class="macro">macro_rules! </span>pack_simd_stride { |
| (<span class="macro-nonterminal">$name</span>:ident, <span class="macro-nonterminal">$load</span>:ident, <span class="macro-nonterminal">$store</span>:ident) => { |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub unsafe fn </span><span class="macro-nonterminal">$name</span>(src: <span class="kw-2">*const </span>u16, dst: <span class="kw-2">*mut </span>u8) { |
| <span class="kw">let </span>first = <span class="macro-nonterminal">$load</span>(src); |
| <span class="kw">let </span>second = <span class="macro-nonterminal">$load</span>(src.add(<span class="number">8</span>)); |
| <span class="macro-nonterminal">$store</span>(dst, simd_pack(first, second)); |
| } |
| }; |
| } |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(all(feature = <span class="string">"simd-accel"</span>, target_endian = <span class="string">"little"</span>, target_arch = <span class="string">"aarch64"</span>))] </span>{ |
| <span class="comment">// SIMD with the same instructions for aligned and unaligned loads and stores |
| |
| </span><span class="kw">pub const </span>SIMD_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>MAX_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="comment">// pub const ALIGNMENT: usize = 8; |
| |
| </span><span class="kw">pub const </span>ALU_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT_MASK: usize = <span class="number">7</span>; |
| |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_neither_aligned, load16_unaligned, store16_unaligned); |
| |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_neither_aligned, load16_unaligned, store8_unaligned); |
| <span class="macro">unpack_simd_stride!</span>(unpack_stride_neither_aligned, load16_unaligned, store8_unaligned); |
| |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned); |
| <span class="macro">pack_simd_stride!</span>(pack_stride_neither_aligned, load8_unaligned, store16_unaligned); |
| |
| <span class="macro">ascii_simd_unalign!</span>(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_neither_aligned); |
| <span class="macro">ascii_simd_unalign!</span>(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_neither_aligned); |
| <span class="macro">ascii_simd_unalign!</span>(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_neither_aligned); |
| <span class="macro">latin1_simd_unalign!</span>(unpack_latin1, u8, u16, unpack_stride_neither_aligned); |
| <span class="macro">latin1_simd_unalign!</span>(pack_latin1, u16, u8, pack_stride_neither_aligned); |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(feature = <span class="string">"simd-accel"</span>, target_endian = <span class="string">"little"</span>, target_feature = <span class="string">"neon"</span>))] </span>{ |
| <span class="comment">// SIMD with different instructions for aligned and unaligned loads and stores. |
| // |
| // Newer microarchitectures are not supposed to have a performance difference between |
| // aligned and unaligned SSE2 loads and stores when the address is actually aligned, |
| // but the benchmark results I see don't agree. |
| |
| </span><span class="kw">pub const </span>SIMD_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>MAX_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>SIMD_ALIGNMENT_MASK: usize = <span class="number">15</span>; |
| |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_both_aligned, load16_aligned, store16_aligned); |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_src_aligned, load16_aligned, store16_unaligned); |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_dst_aligned, load16_unaligned, store16_aligned); |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_neither_aligned, load16_unaligned, store16_unaligned); |
| |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_both_aligned, load16_aligned, store8_aligned); |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_src_aligned, load16_aligned, store8_unaligned); |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_dst_aligned, load16_unaligned, store8_aligned); |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_neither_aligned, load16_unaligned, store8_unaligned); |
| |
| <span class="macro">unpack_simd_stride!</span>(unpack_stride_both_aligned, load16_aligned, store8_aligned); |
| <span class="macro">unpack_simd_stride!</span>(unpack_stride_src_aligned, load16_aligned, store8_unaligned); |
| <span class="macro">unpack_simd_stride!</span>(unpack_stride_dst_aligned, load16_unaligned, store8_aligned); |
| <span class="macro">unpack_simd_stride!</span>(unpack_stride_neither_aligned, load16_unaligned, store8_unaligned); |
| |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_both_aligned, load8_aligned, store16_aligned); |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_src_aligned, load8_aligned, store16_unaligned); |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_dst_aligned, load8_unaligned, store16_aligned); |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned); |
| |
| <span class="macro">pack_simd_stride!</span>(pack_stride_both_aligned, load8_aligned, store16_aligned); |
| <span class="macro">pack_simd_stride!</span>(pack_stride_src_aligned, load8_aligned, store16_unaligned); |
| <span class="macro">pack_simd_stride!</span>(pack_stride_dst_aligned, load8_unaligned, store16_aligned); |
| <span class="macro">pack_simd_stride!</span>(pack_stride_neither_aligned, load8_unaligned, store16_unaligned); |
| |
| <span class="macro">ascii_simd_check_align!</span>(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_both_aligned, ascii_to_ascii_stride_src_aligned, ascii_to_ascii_stride_dst_aligned, ascii_to_ascii_stride_neither_aligned); |
| <span class="macro">ascii_simd_check_align!</span>(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_both_aligned, ascii_to_basic_latin_stride_src_aligned, ascii_to_basic_latin_stride_dst_aligned, ascii_to_basic_latin_stride_neither_aligned); |
| <span class="macro">ascii_simd_check_align!</span>(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_both_aligned, basic_latin_to_ascii_stride_src_aligned, basic_latin_to_ascii_stride_dst_aligned, basic_latin_to_ascii_stride_neither_aligned); |
| <span class="macro">latin1_simd_check_align!</span>(unpack_latin1, u8, u16, unpack_stride_both_aligned, unpack_stride_src_aligned, unpack_stride_dst_aligned, unpack_stride_neither_aligned); |
| <span class="macro">latin1_simd_check_align!</span>(pack_latin1, u16, u8, pack_stride_both_aligned, pack_stride_src_aligned, pack_stride_dst_aligned, pack_stride_neither_aligned); |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(feature = <span class="string">"simd-accel"</span>, target_feature = <span class="string">"sse2"</span>))] </span>{ |
| <span class="comment">// SIMD with different instructions for aligned and unaligned loads and stores. |
| // |
| // Newer microarchitectures are not supposed to have a performance difference between |
| // aligned and unaligned SSE2 loads and stores when the address is actually aligned, |
| // but the benchmark results I see don't agree. |
| |
| </span><span class="kw">pub const </span>SIMD_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>SIMD_ALIGNMENT: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>MAX_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>SIMD_ALIGNMENT_MASK: usize = <span class="number">15</span>; |
| |
| <span class="macro">ascii_to_ascii_simd_double_stride!</span>(ascii_to_ascii_simd_double_stride_both_aligned, store16_aligned); |
| <span class="macro">ascii_to_ascii_simd_double_stride!</span>(ascii_to_ascii_simd_double_stride_src_aligned, store16_unaligned); |
| |
| <span class="macro">ascii_to_basic_latin_simd_double_stride!</span>(ascii_to_basic_latin_simd_double_stride_both_aligned, store8_aligned); |
| <span class="macro">ascii_to_basic_latin_simd_double_stride!</span>(ascii_to_basic_latin_simd_double_stride_src_aligned, store8_unaligned); |
| |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_both_aligned, load16_aligned, store16_aligned); |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_src_aligned, load16_aligned, store16_unaligned); |
| <span class="macro">ascii_to_ascii_simd_stride!</span>(ascii_to_ascii_stride_neither_aligned, load16_unaligned, store16_unaligned); |
| |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_both_aligned, load16_aligned, store8_aligned); |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_src_aligned, load16_aligned, store8_unaligned); |
| <span class="macro">ascii_to_basic_latin_simd_stride!</span>(ascii_to_basic_latin_stride_neither_aligned, load16_unaligned, store8_unaligned); |
| |
| <span class="macro">unpack_simd_stride!</span>(unpack_stride_both_aligned, load16_aligned, store8_aligned); |
| <span class="macro">unpack_simd_stride!</span>(unpack_stride_src_aligned, load16_aligned, store8_unaligned); |
| |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_both_aligned, load8_aligned, store16_aligned); |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_src_aligned, load8_aligned, store16_unaligned); |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_dst_aligned, load8_unaligned, store16_aligned); |
| <span class="macro">basic_latin_to_ascii_simd_stride!</span>(basic_latin_to_ascii_stride_neither_aligned, load8_unaligned, store16_unaligned); |
| |
| <span class="macro">pack_simd_stride!</span>(pack_stride_both_aligned, load8_aligned, store16_aligned); |
| <span class="macro">pack_simd_stride!</span>(pack_stride_src_aligned, load8_aligned, store16_unaligned); |
| |
| <span class="macro">ascii_simd_check_align_unrolled!</span>(ascii_to_ascii, u8, u8, ascii_to_ascii_stride_both_aligned, ascii_to_ascii_stride_src_aligned, ascii_to_ascii_stride_neither_aligned, ascii_to_ascii_simd_double_stride_both_aligned, ascii_to_ascii_simd_double_stride_src_aligned); |
| <span class="macro">ascii_simd_check_align_unrolled!</span>(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_both_aligned, ascii_to_basic_latin_stride_src_aligned, ascii_to_basic_latin_stride_neither_aligned, ascii_to_basic_latin_simd_double_stride_both_aligned, ascii_to_basic_latin_simd_double_stride_src_aligned); |
| |
| <span class="macro">ascii_simd_check_align!</span>(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_both_aligned, basic_latin_to_ascii_stride_src_aligned, basic_latin_to_ascii_stride_dst_aligned, basic_latin_to_ascii_stride_neither_aligned); |
| <span class="macro">latin1_simd_check_align_unrolled!</span>(unpack_latin1, u8, u16, unpack_stride_both_aligned, unpack_stride_src_aligned, unpack_stride_dst_aligned, unpack_stride_neither_aligned); |
| <span class="macro">latin1_simd_check_align_unrolled!</span>(pack_latin1, u16, u8, pack_stride_both_aligned, pack_stride_src_aligned, pack_stride_dst_aligned, pack_stride_neither_aligned); |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_endian = <span class="string">"little"</span>, target_pointer_width = <span class="string">"64"</span>))] </span>{ |
| <span class="comment">// Aligned ALU word, little-endian, 64-bit |
| |
| </span><span class="kw">pub const </span>ALU_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>MAX_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT_MASK: usize = <span class="number">7</span>; |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>unpack_alu(word: usize, second_word: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>first = ((<span class="number">0x0000_0000_FF00_0000usize </span>& word) << <span class="number">24</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& word) << <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_0000_FF00usize </span>& word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_0000_0000_00FFusize </span>& word); |
| <span class="kw">let </span>second = ((<span class="number">0xFF00_0000_0000_0000usize </span>& word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000_0000_0000usize </span>& word) >> <span class="number">16</span>) | |
| ((<span class="number">0x0000_FF00_0000_0000usize </span>& word) >> <span class="number">24</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& word) >> <span class="number">32</span>); |
| <span class="kw">let </span>third = ((<span class="number">0x0000_0000_FF00_0000usize </span>& second_word) << <span class="number">24</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& second_word) << <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_0000_FF00usize </span>& second_word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_0000_0000_00FFusize </span>& second_word); |
| <span class="kw">let </span>fourth = ((<span class="number">0xFF00_0000_0000_0000usize </span>& second_word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000_0000_0000usize </span>& second_word) >> <span class="number">16</span>) | |
| ((<span class="number">0x0000_FF00_0000_0000usize </span>& second_word) >> <span class="number">24</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& second_word) >> <span class="number">32</span>); |
| <span class="kw-2">*</span>dst = first; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second; |
| <span class="kw-2">*</span>(dst.add(<span class="number">2</span>)) = third; |
| <span class="kw-2">*</span>(dst.add(<span class="number">3</span>)) = fourth; |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>word = ((<span class="number">0x00FF_0000_0000_0000usize </span>& second) << <span class="number">8</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& second) << <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& second) << <span class="number">24</span>) | |
| ((<span class="number">0x0000_0000_0000_00FFusize </span>& second) << <span class="number">32</span>) | |
| ((<span class="number">0x00FF_0000_0000_0000usize </span>& first) >> <span class="number">24</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& first) >> <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& first) >> <span class="number">8</span>) | |
| (<span class="number">0x0000_0000_0000_00FFusize </span>& first); |
| <span class="kw">let </span>second_word = ((<span class="number">0x00FF_0000_0000_0000usize </span>& fourth) << <span class="number">8</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& fourth) << <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& fourth) << <span class="number">24</span>) | |
| ((<span class="number">0x0000_0000_0000_00FFusize </span>& fourth) << <span class="number">32</span>) | |
| ((<span class="number">0x00FF_0000_0000_0000usize </span>& third) >> <span class="number">24</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& third) >> <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& third) >> <span class="number">8</span>) | |
| (<span class="number">0x0000_0000_0000_00FFusize </span>& third); |
| <span class="kw-2">*</span>dst = word; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second_word; |
| } |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_endian = <span class="string">"little"</span>, target_pointer_width = <span class="string">"32"</span>))] </span>{ |
| <span class="comment">// Aligned ALU word, little-endian, 32-bit |
| |
| </span><span class="kw">pub const </span>ALU_STRIDE_SIZE: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>MAX_STRIDE_SIZE: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT: usize = <span class="number">4</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT_MASK: usize = <span class="number">3</span>; |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>unpack_alu(word: usize, second_word: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>first = ((<span class="number">0x0000_FF00usize </span>& word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& word); |
| <span class="kw">let </span>second = ((<span class="number">0xFF00_0000usize </span>& word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& word) >> <span class="number">16</span>); |
| <span class="kw">let </span>third = ((<span class="number">0x0000_FF00usize </span>& second_word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& second_word); |
| <span class="kw">let </span>fourth = ((<span class="number">0xFF00_0000usize </span>& second_word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& second_word) >> <span class="number">16</span>); |
| <span class="kw-2">*</span>dst = first; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second; |
| <span class="kw-2">*</span>(dst.add(<span class="number">2</span>)) = third; |
| <span class="kw-2">*</span>(dst.add(<span class="number">3</span>)) = fourth; |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>word = ((<span class="number">0x00FF_0000usize </span>& second) << <span class="number">8</span>) | |
| ((<span class="number">0x0000_00FFusize </span>& second) << <span class="number">16</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& first) >> <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& first); |
| <span class="kw">let </span>second_word = ((<span class="number">0x00FF_0000usize </span>& fourth) << <span class="number">8</span>) | |
| ((<span class="number">0x0000_00FFusize </span>& fourth) << <span class="number">16</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& third) >> <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& third); |
| <span class="kw-2">*</span>dst = word; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second_word; |
| } |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_endian = <span class="string">"big"</span>, target_pointer_width = <span class="string">"64"</span>))] </span>{ |
| <span class="comment">// Aligned ALU word, big-endian, 64-bit |
| |
| </span><span class="kw">pub const </span>ALU_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>MAX_STRIDE_SIZE: usize = <span class="number">16</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT_MASK: usize = <span class="number">7</span>; |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>unpack_alu(word: usize, second_word: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>first = ((<span class="number">0xFF00_0000_0000_0000usize </span>& word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000_0000_0000usize </span>& word) >> <span class="number">16</span>) | |
| ((<span class="number">0x0000_FF00_0000_0000usize </span>& word) >> <span class="number">24</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& word) >> <span class="number">32</span>); |
| <span class="kw">let </span>second = ((<span class="number">0x0000_0000_FF00_0000usize </span>& word) << <span class="number">24</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& word) << <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_0000_FF00usize </span>& word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_0000_0000_00FFusize </span>& word); |
| <span class="kw">let </span>third = ((<span class="number">0xFF00_0000_0000_0000usize </span>& second_word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000_0000_0000usize </span>& second_word) >> <span class="number">16</span>) | |
| ((<span class="number">0x0000_FF00_0000_0000usize </span>& second_word) >> <span class="number">24</span>) | |
| ((<span class="number">0x0000_00FF_0000_0000usize </span>& second_word) >> <span class="number">32</span>); |
| <span class="kw">let </span>fourth = ((<span class="number">0x0000_0000_FF00_0000usize </span>& second_word) << <span class="number">24</span>) | |
| ((<span class="number">0x0000_0000_00FF_0000usize </span>& second_word) << <span class="number">16</span>) | |
| ((<span class="number">0x0000_0000_0000_FF00usize </span>& second_word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_0000_0000_00FFusize </span>& second_word); |
| <span class="kw-2">*</span>dst = first; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second; |
| <span class="kw-2">*</span>(dst.add(<span class="number">2</span>)) = third; |
| <span class="kw-2">*</span>(dst.add(<span class="number">3</span>)) = fourth; |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>word = ((<span class="number">0x00FF0000_00000000usize </span>& first) << <span class="number">8</span>) | |
| ((<span class="number">0x000000FF_00000000usize </span>& first) << <span class="number">16</span>) | |
| ((<span class="number">0x00000000_00FF0000usize </span>& first) << <span class="number">24</span>) | |
| ((<span class="number">0x00000000_000000FFusize </span>& first) << <span class="number">32</span>) | |
| ((<span class="number">0x00FF0000_00000000usize </span>& second) >> <span class="number">24</span>) | |
| ((<span class="number">0x000000FF_00000000usize </span>& second) >> <span class="number">16</span>) | |
| ((<span class="number">0x00000000_00FF0000usize </span>& second) >> <span class="number">8</span>) | |
| (<span class="number">0x00000000_000000FFusize </span>& second); |
| <span class="kw">let </span>second_word = ((<span class="number">0x00FF0000_00000000usize </span>& third) << <span class="number">8</span>) | |
| ((<span class="number">0x000000FF_00000000usize </span>& third) << <span class="number">16</span>) | |
| ((<span class="number">0x00000000_00FF0000usize </span>& third) << <span class="number">24</span>) | |
| ((<span class="number">0x00000000_000000FFusize </span>& third) << <span class="number">32</span>) | |
| ((<span class="number">0x00FF0000_00000000usize </span>& fourth) >> <span class="number">24</span>) | |
| ((<span class="number">0x000000FF_00000000usize </span>& fourth) >> <span class="number">16</span>) | |
| ((<span class="number">0x00000000_00FF0000usize </span>& fourth) >> <span class="number">8</span>) | |
| (<span class="number">0x00000000_000000FFusize </span>& fourth); |
| <span class="kw-2">*</span>dst = word; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second_word; |
| } |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(target_endian = <span class="string">"big"</span>, target_pointer_width = <span class="string">"32"</span>))] </span>{ |
| <span class="comment">// Aligned ALU word, big-endian, 32-bit |
| |
| </span><span class="kw">pub const </span>ALU_STRIDE_SIZE: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>MAX_STRIDE_SIZE: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT: usize = <span class="number">4</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT_MASK: usize = <span class="number">3</span>; |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>unpack_alu(word: usize, second_word: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>first = ((<span class="number">0xFF00_0000usize </span>& word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& word) >> <span class="number">16</span>); |
| <span class="kw">let </span>second = ((<span class="number">0x0000_FF00usize </span>& word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& word); |
| <span class="kw">let </span>third = ((<span class="number">0xFF00_0000usize </span>& second_word) >> <span class="number">8</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& second_word) >> <span class="number">16</span>); |
| <span class="kw">let </span>fourth = ((<span class="number">0x0000_FF00usize </span>& second_word) << <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& second_word); |
| <span class="kw-2">*</span>dst = first; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second; |
| <span class="kw-2">*</span>(dst.add(<span class="number">2</span>)) = third; |
| <span class="kw-2">*</span>(dst.add(<span class="number">3</span>)) = fourth; |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>pack_alu(first: usize, second: usize, third: usize, fourth: usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>word = ((<span class="number">0x00FF_0000usize </span>& first) << <span class="number">8</span>) | |
| ((<span class="number">0x0000_00FFusize </span>& first) << <span class="number">16</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& second) >> <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& second); |
| <span class="kw">let </span>second_word = ((<span class="number">0x00FF_0000usize </span>& third) << <span class="number">8</span>) | |
| ((<span class="number">0x0000_00FFusize </span>& third) << <span class="number">16</span>) | |
| ((<span class="number">0x00FF_0000usize </span>& fourth) >> <span class="number">8</span>) | |
| (<span class="number">0x0000_00FFusize </span>& fourth); |
| <span class="kw-2">*</span>dst = word; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second_word; |
| } |
| } <span class="kw">else </span>{ |
| <span class="macro">ascii_naive!</span>(ascii_to_ascii, u8, u8); |
| <span class="macro">ascii_naive!</span>(ascii_to_basic_latin, u8, u16); |
| <span class="macro">ascii_naive!</span>(basic_latin_to_ascii, u16, u8); |
| } |
| } |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(target_endian = <span class="string">"little"</span>)] </span>{ |
| <span class="attribute">#[allow(dead_code)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>count_zeros(word: usize) -> u32 { |
| word.trailing_zeros() |
| } |
| } <span class="kw">else </span>{ |
| <span class="attribute">#[allow(dead_code)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>count_zeros(word: usize) -> u32 { |
| word.leading_zeros() |
| } |
| } |
| } |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(all(feature = <span class="string">"simd-accel"</span>, target_endian = <span class="string">"little"</span>, target_arch = <span class="string">"disabled"</span>))] </span>{ |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub fn </span>validate_ascii(slice: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><(u8, usize)> { |
| <span class="kw">let </span>src = slice.as_ptr(); |
| <span class="kw">let </span>len = slice.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>len_minus_stride = len - SIMD_STRIDE_SIZE; |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>simd = <span class="kw">unsafe </span>{ load16_unaligned(src.add(offset)) }; |
| <span class="kw">if </span>!simd_is_ascii(simd) { |
| <span class="kw">break</span>; |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = slice[offset]; |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(feature = <span class="string">"simd-accel"</span>, target_feature = <span class="string">"sse2"</span>))] </span>{ |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub fn </span>validate_ascii(slice: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><(u8, usize)> { |
| <span class="kw">let </span>src = slice.as_ptr(); |
| <span class="kw">let </span>len = slice.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">if </span>SIMD_STRIDE_SIZE <= len { |
| <span class="comment">// First, process one unaligned vector |
| </span><span class="kw">let </span>simd = <span class="kw">unsafe </span>{ load16_unaligned(src) }; |
| <span class="kw">let </span>mask = mask_ascii(simd); |
| <span class="kw">if </span>mask != <span class="number">0 </span>{ |
| offset = mask.trailing_zeros() <span class="kw">as </span>usize; |
| <span class="kw">let </span>non_ascii = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>src.add(offset) }; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((non_ascii, offset)); |
| } |
| offset = SIMD_STRIDE_SIZE; |
| |
| <span class="comment">// We have now seen 16 ASCII bytes. Let's guess that |
| // there will be enough more to justify more expense |
| // in the case of non-ASCII. |
| // Use aligned reads for the sake of old microachitectures. |
| </span><span class="kw">let </span>until_alignment = <span class="kw">unsafe </span>{ (SIMD_ALIGNMENT - ((src.add(offset) <span class="kw">as </span>usize) & SIMD_ALIGNMENT_MASK)) & SIMD_ALIGNMENT_MASK }; |
| <span class="comment">// This addition won't overflow, because even in the 32-bit PAE case the |
| // address space holds enough code that the slice length can't be that |
| // close to address space size. |
| // offset now equals SIMD_STRIDE_SIZE, hence times 3 below. |
| </span><span class="kw">if </span>until_alignment + (SIMD_STRIDE_SIZE * <span class="number">3</span>) <= len { |
| <span class="kw">if </span>until_alignment != <span class="number">0 </span>{ |
| <span class="kw">let </span>simd = <span class="kw">unsafe </span>{ load16_unaligned(src.add(offset)) }; |
| <span class="kw">let </span>mask = mask_ascii(simd); |
| <span class="kw">if </span>mask != <span class="number">0 </span>{ |
| offset += mask.trailing_zeros() <span class="kw">as </span>usize; |
| <span class="kw">let </span>non_ascii = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>src.add(offset) }; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((non_ascii, offset)); |
| } |
| offset += until_alignment; |
| } |
| <span class="kw">let </span>len_minus_stride_times_two = len - (SIMD_STRIDE_SIZE * <span class="number">2</span>); |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>first = <span class="kw">unsafe </span>{ load16_aligned(src.add(offset)) }; |
| <span class="kw">let </span>second = <span class="kw">unsafe </span>{ load16_aligned(src.add(offset + SIMD_STRIDE_SIZE)) }; |
| <span class="kw">if </span>!simd_is_ascii(first | second) { |
| <span class="kw">let </span>mask_first = mask_ascii(first); |
| <span class="kw">if </span>mask_first != <span class="number">0 </span>{ |
| offset += mask_first.trailing_zeros() <span class="kw">as </span>usize; |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>mask_second = mask_ascii(second); |
| offset += SIMD_STRIDE_SIZE + mask_second.trailing_zeros() <span class="kw">as </span>usize; |
| } |
| <span class="kw">let </span>non_ascii = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>src.add(offset) }; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((non_ascii, offset)); |
| } |
| offset += SIMD_STRIDE_SIZE * <span class="number">2</span>; |
| <span class="kw">if </span>offset > len_minus_stride_times_two { |
| <span class="kw">break</span>; |
| } |
| } |
| <span class="kw">if </span>offset + SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>simd = <span class="kw">unsafe </span>{ load16_aligned(src.add(offset)) }; |
| <span class="kw">let </span>mask = mask_ascii(simd); |
| <span class="kw">if </span>mask != <span class="number">0 </span>{ |
| offset += mask.trailing_zeros() <span class="kw">as </span>usize; |
| <span class="kw">let </span>non_ascii = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>src.add(offset) }; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((non_ascii, offset)); |
| } |
| offset += SIMD_STRIDE_SIZE; |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// At most two iterations, so unroll |
| </span><span class="kw">if </span>offset + SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>simd = <span class="kw">unsafe </span>{ load16_unaligned(src.add(offset)) }; |
| <span class="kw">let </span>mask = mask_ascii(simd); |
| <span class="kw">if </span>mask != <span class="number">0 </span>{ |
| offset += mask.trailing_zeros() <span class="kw">as </span>usize; |
| <span class="kw">let </span>non_ascii = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>src.add(offset) }; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((non_ascii, offset)); |
| } |
| offset += SIMD_STRIDE_SIZE; |
| <span class="kw">if </span>offset + SIMD_STRIDE_SIZE <= len { |
| <span class="kw">let </span>simd = <span class="kw">unsafe </span>{ load16_unaligned(src.add(offset)) }; |
| <span class="kw">let </span>mask = mask_ascii(simd); |
| <span class="kw">if </span>mask != <span class="number">0 </span>{ |
| offset += mask.trailing_zeros() <span class="kw">as </span>usize; |
| <span class="kw">let </span>non_ascii = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>src.add(offset) }; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((non_ascii, offset)); |
| } |
| offset += SIMD_STRIDE_SIZE; |
| } |
| } |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = <span class="kw">unsafe </span>{ <span class="kw-2">*</span>(src.add(offset)) }; |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| } <span class="kw">else </span>{ |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">fn </span>find_non_ascii(word: usize, second_word: usize) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>word_masked = word & ASCII_MASK; |
| <span class="kw">let </span>second_masked = second_word & ASCII_MASK; |
| <span class="kw">if </span>(word_masked | second_masked) == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| <span class="kw">if </span>word_masked != <span class="number">0 </span>{ |
| <span class="kw">let </span>zeros = count_zeros(word_masked); |
| <span class="comment">// `zeros` now contains 7 (for the seven bits of non-ASCII) |
| // plus 8 times the number of ASCII in text order before the |
| // non-ASCII byte in the little-endian case or 8 times the number of ASCII in |
| // text order before the non-ASCII byte in the big-endian case. |
| </span><span class="kw">let </span>num_ascii = (zeros >> <span class="number">3</span>) <span class="kw">as </span>usize; |
| <span class="kw">return </span><span class="prelude-val">Some</span>(num_ascii); |
| } |
| <span class="kw">let </span>zeros = count_zeros(second_masked); |
| <span class="comment">// `zeros` now contains 7 (for the seven bits of non-ASCII) |
| // plus 8 times the number of ASCII in text order before the |
| // non-ASCII byte in the little-endian case or 8 times the number of ASCII in |
| // text order before the non-ASCII byte in the big-endian case. |
| </span><span class="kw">let </span>num_ascii = (zeros >> <span class="number">3</span>) <span class="kw">as </span>usize; |
| <span class="prelude-val">Some</span>(ALU_ALIGNMENT + num_ascii) |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>validate_ascii_stride(src: <span class="kw-2">*const </span>usize) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>word = <span class="kw-2">*</span>src; |
| <span class="kw">let </span>second_word = <span class="kw-2">*</span>(src.add(<span class="number">1</span>)); |
| find_non_ascii(word, second_word) |
| } |
| |
| <span class="attribute">#[cfg_attr(feature = <span class="string">"cargo-clippy"</span>, allow(cast_ptr_alignment))] |
| #[inline(always)] |
| </span><span class="kw">pub fn </span>validate_ascii(slice: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><(u8, usize)> { |
| <span class="kw">let </span>src = slice.as_ptr(); |
| <span class="kw">let </span>len = slice.len(); |
| <span class="kw">let </span><span class="kw-2">mut </span>offset = <span class="number">0usize</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>until_alignment = (ALU_ALIGNMENT - ((src <span class="kw">as </span>usize) & ALU_ALIGNMENT_MASK)) & ALU_ALIGNMENT_MASK; |
| <span class="kw">if </span>until_alignment + ALU_STRIDE_SIZE <= len { |
| <span class="kw">while </span>until_alignment != <span class="number">0 </span>{ |
| <span class="kw">let </span>code_unit = slice[offset]; |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| offset += <span class="number">1</span>; |
| until_alignment -= <span class="number">1</span>; |
| } |
| <span class="kw">let </span>len_minus_stride = len - ALU_STRIDE_SIZE; |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>ptr = <span class="kw">unsafe </span>{ src.add(offset) <span class="kw">as </span><span class="kw-2">*const </span>usize }; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(num_ascii) = <span class="kw">unsafe </span>{ validate_ascii_stride(ptr) } { |
| offset += num_ascii; |
| <span class="kw">return </span><span class="prelude-val">Some</span>((<span class="kw">unsafe </span>{ <span class="kw-2">*</span>(src.add(offset)) }, offset)); |
| } |
| offset += ALU_STRIDE_SIZE; |
| <span class="kw">if </span>offset > len_minus_stride { |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| <span class="kw">while </span>offset < len { |
| <span class="kw">let </span>code_unit = slice[offset]; |
| <span class="kw">if </span>code_unit > <span class="number">127 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Some</span>((code_unit, offset)); |
| } |
| offset += <span class="number">1</span>; |
| } |
| <span class="prelude-val">None |
| </span>} |
| |
| } |
| } |
| |
| <span class="macro">cfg_if! </span>{ |
| <span class="kw">if </span><span class="attribute">#[cfg(all(feature = <span class="string">"simd-accel"</span>, any(target_feature = <span class="string">"sse2"</span>, all(target_endian = <span class="string">"little"</span>, target_arch = <span class="string">"aarch64"</span>))))] </span>{ |
| |
| } <span class="kw">else if </span><span class="attribute">#[cfg(all(feature = <span class="string">"simd-accel"</span>, target_endian = <span class="string">"little"</span>, target_feature = <span class="string">"neon"</span>))] </span>{ |
| <span class="comment">// Even with NEON enabled, we use the ALU path for ASCII validation, because testing |
| // on Exynos 5 indicated that using NEON isn't worthwhile where there are only |
| // vector reads without vector writes. |
| |
| </span><span class="kw">pub const </span>ALU_STRIDE_SIZE: usize = <span class="number">8</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT: usize = <span class="number">4</span>; |
| |
| <span class="kw">pub const </span>ALU_ALIGNMENT_MASK: usize = <span class="number">3</span>; |
| } <span class="kw">else </span>{ |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>unpack_latin1_stride_alu(src: <span class="kw-2">*const </span>usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>word = <span class="kw-2">*</span>src; |
| <span class="kw">let </span>second_word = <span class="kw-2">*</span>(src.add(<span class="number">1</span>)); |
| unpack_alu(word, second_word, dst); |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>pack_latin1_stride_alu(src: <span class="kw-2">*const </span>usize, dst: <span class="kw-2">*mut </span>usize) { |
| <span class="kw">let </span>first = <span class="kw-2">*</span>src; |
| <span class="kw">let </span>second = <span class="kw-2">*</span>(src.add(<span class="number">1</span>)); |
| <span class="kw">let </span>third = <span class="kw-2">*</span>(src.add(<span class="number">2</span>)); |
| <span class="kw">let </span>fourth = <span class="kw-2">*</span>(src.add(<span class="number">3</span>)); |
| pack_alu(first, second, third, fourth, dst); |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>ascii_to_basic_latin_stride_alu(src: <span class="kw-2">*const </span>usize, dst: <span class="kw-2">*mut </span>usize) -> bool { |
| <span class="kw">let </span>word = <span class="kw-2">*</span>src; |
| <span class="kw">let </span>second_word = <span class="kw-2">*</span>(src.add(<span class="number">1</span>)); |
| <span class="comment">// Check if the words contains non-ASCII |
| </span><span class="kw">if </span>(word & ASCII_MASK) | (second_word & ASCII_MASK) != <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| unpack_alu(word, second_word, dst); |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>basic_latin_to_ascii_stride_alu(src: <span class="kw-2">*const </span>usize, dst: <span class="kw-2">*mut </span>usize) -> bool { |
| <span class="kw">let </span>first = <span class="kw-2">*</span>src; |
| <span class="kw">let </span>second = <span class="kw-2">*</span>(src.add(<span class="number">1</span>)); |
| <span class="kw">let </span>third = <span class="kw-2">*</span>(src.add(<span class="number">2</span>)); |
| <span class="kw">let </span>fourth = <span class="kw-2">*</span>(src.add(<span class="number">3</span>)); |
| <span class="kw">if </span>(first & BASIC_LATIN_MASK) | (second & BASIC_LATIN_MASK) | (third & BASIC_LATIN_MASK) | (fourth & BASIC_LATIN_MASK) != <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="bool-val">false</span>; |
| } |
| pack_alu(first, second, third, fourth, dst); |
| <span class="bool-val">true |
| </span>} |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">unsafe fn </span>ascii_to_ascii_stride(src: <span class="kw-2">*const </span>usize, dst: <span class="kw-2">*mut </span>usize) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>word = <span class="kw-2">*</span>src; |
| <span class="kw">let </span>second_word = <span class="kw-2">*</span>(src.add(<span class="number">1</span>)); |
| <span class="kw-2">*</span>dst = word; |
| <span class="kw-2">*</span>(dst.add(<span class="number">1</span>)) = second_word; |
| find_non_ascii(word, second_word) |
| } |
| |
| <span class="macro">basic_latin_alu!</span>(ascii_to_basic_latin, u8, u16, ascii_to_basic_latin_stride_alu); |
| <span class="macro">basic_latin_alu!</span>(basic_latin_to_ascii, u16, u8, basic_latin_to_ascii_stride_alu); |
| <span class="macro">latin1_alu!</span>(unpack_latin1, u8, u16, unpack_latin1_stride_alu); |
| <span class="macro">latin1_alu!</span>(pack_latin1, u16, u8, pack_latin1_stride_alu); |
| <span class="macro">ascii_alu!</span>(ascii_to_ascii, u8, u8, ascii_to_ascii_stride); |
| } |
| } |
| |
| <span class="kw">pub fn </span>ascii_valid_up_to(bytes: <span class="kw-2">&</span>[u8]) -> usize { |
| <span class="kw">match </span>validate_ascii(bytes) { |
| <span class="prelude-val">None </span>=> bytes.len(), |
| <span class="prelude-val">Some</span>((<span class="kw">_</span>, num_valid)) => num_valid, |
| } |
| } |
| |
| <span class="kw">pub fn </span>iso_2022_jp_ascii_valid_up_to(bytes: <span class="kw-2">&</span>[u8]) -> usize { |
| <span class="kw">for </span>(i, b_ref) <span class="kw">in </span>bytes.iter().enumerate() { |
| <span class="kw">let </span>b = <span class="kw-2">*</span>b_ref; |
| <span class="kw">if </span>b >= <span class="number">0x80 </span>|| b == <span class="number">0x1B </span>|| b == <span class="number">0x0E </span>|| b == <span class="number">0x0F </span>{ |
| <span class="kw">return </span>i; |
| } |
| } |
| bytes.len() |
| } |
| |
| <span class="comment">// Any copyright to the test code below this comment is dedicated to the |
| // Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ |
| |
| </span><span class="attribute">#[cfg(all(test, feature = <span class="string">"alloc"</span>))] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>alloc::vec::Vec; |
| |
| <span class="macro">macro_rules! </span>test_ascii { |
| (<span class="macro-nonterminal">$test_name</span>:ident, <span class="macro-nonterminal">$fn_tested</span>:ident, <span class="macro-nonterminal">$src_unit</span>:ty, <span class="macro-nonterminal">$dst_unit</span>:ty) => { |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span><span class="macro-nonterminal">$test_name</span>() { |
| <span class="kw">let </span><span class="kw-2">mut </span>src: Vec<<span class="macro-nonterminal">$src_unit</span>> = Vec::with_capacity(<span class="number">32</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>dst: Vec<<span class="macro-nonterminal">$dst_unit</span>> = Vec::with_capacity(<span class="number">32</span>); |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">32 </span>{ |
| src.clear(); |
| dst.clear(); |
| dst.resize(<span class="number">32</span>, <span class="number">0</span>); |
| <span class="kw">for </span>j <span class="kw">in </span><span class="number">0</span>..<span class="number">32 </span>{ |
| <span class="kw">let </span>c = <span class="kw">if </span>i == j { <span class="number">0xAA </span>} <span class="kw">else </span>{ j + <span class="number">0x40 </span>}; |
| src.push(c <span class="kw">as </span><span class="macro-nonterminal">$src_unit</span>); |
| } |
| <span class="kw">match unsafe </span>{ <span class="macro-nonterminal">$fn_tested</span>(src.as_ptr(), dst.as_mut_ptr(), <span class="number">32</span>) } { |
| <span class="prelude-val">None </span>=> <span class="macro">unreachable!</span>(<span class="string">"Should always find non-ASCII"</span>), |
| <span class="prelude-val">Some</span>((non_ascii, num_ascii)) => { |
| <span class="macro">assert_eq!</span>(non_ascii, <span class="number">0xAA</span>); |
| <span class="macro">assert_eq!</span>(num_ascii, i); |
| <span class="kw">for </span>j <span class="kw">in </span><span class="number">0</span>..i { |
| <span class="macro">assert_eq!</span>(dst[j], (j + <span class="number">0x40</span>) <span class="kw">as </span><span class="macro-nonterminal">$dst_unit</span>); |
| } |
| } |
| } |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">test_ascii!</span>(test_ascii_to_ascii, ascii_to_ascii, u8, u8); |
| <span class="macro">test_ascii!</span>(test_ascii_to_basic_latin, ascii_to_basic_latin, u8, u16); |
| <span class="macro">test_ascii!</span>(test_basic_latin_to_ascii, basic_latin_to_ascii, u16, u8); |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="encoding_rs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |