| <!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/ahash-0.7.6/src/operations.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>operations.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="../../ahash/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="../../ahash/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::convert::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// This is a constant with a lot of special properties found by automated search. |
| /// See the unit tests below. (Below are alternative values) |
| </span><span class="attribute">#[cfg(all(target_feature = <span class="string">"ssse3"</span>, not(miri)))] |
| </span><span class="kw">const </span>SHUFFLE_MASK: u128 = <span class="number">0x020a0700_0c01030e_050f0d08_06090b04_u128</span>; |
| <span class="comment">//const SHUFFLE_MASK: u128 = 0x000d0702_0a040301_05080f0c_0e0b0609_u128; |
| //const SHUFFLE_MASK: u128 = 0x040A0700_030E0106_0D050F08_020B0C09_u128; |
| |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>folded_multiply(s: u64, by: u64) -> u64 { |
| <span class="kw">let </span>result = (s <span class="kw">as </span>u128).wrapping_mul(by <span class="kw">as </span>u128); |
| ((result & <span class="number">0xffff_ffff_ffff_ffff</span>) <span class="kw">as </span>u64) ^ ((result >> <span class="number">64</span>) <span class="kw">as </span>u64) |
| } |
| |
| |
| <span class="doccomment">/// Given a small (less than 8 byte slice) returns the same data stored in two u32s. |
| /// (order of and non-duplication of bytes is NOT guaranteed) |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>read_small(data: <span class="kw-2">&</span>[u8]) -> [u64; <span class="number">2</span>] { |
| <span class="macro">debug_assert!</span>(data.len() <= <span class="number">8</span>); |
| <span class="kw">if </span>data.len() >= <span class="number">2 </span>{ |
| <span class="kw">if </span>data.len() >= <span class="number">4 </span>{ |
| <span class="comment">//len 4-8 |
| </span>[data.read_u32().<span class="number">0 </span><span class="kw">as </span>u64, data.read_last_u32() <span class="kw">as </span>u64] |
| } <span class="kw">else </span>{ |
| <span class="comment">//len 2-3 |
| </span>[data.read_u16().<span class="number">0 </span><span class="kw">as </span>u64, data[data.len() - <span class="number">1</span>] <span class="kw">as </span>u64] |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">if </span>data.len() > <span class="number">0 </span>{ |
| [data[<span class="number">0</span>] <span class="kw">as </span>u64, data[<span class="number">0</span>] <span class="kw">as </span>u64] |
| } <span class="kw">else </span>{ |
| [<span class="number">0</span>, <span class="number">0</span>] |
| } |
| } |
| } |
| |
| <span class="attribute">#[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>shuffle(a: u128) -> u128 { |
| <span class="attribute">#[cfg(all(target_feature = <span class="string">"ssse3"</span>, not(miri)))] |
| </span>{ |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86"</span>)] |
| </span><span class="kw">use </span>core::arch::x86::<span class="kw-2">*</span>; |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">use </span>core::arch::x86_64::<span class="kw-2">*</span>; |
| <span class="kw">use </span>core::mem::transmute; |
| <span class="kw">unsafe </span>{ transmute(_mm_shuffle_epi8(transmute(a), transmute(SHUFFLE_MASK))) } |
| } |
| <span class="attribute">#[cfg(not(all(target_feature = <span class="string">"ssse3"</span>, not(miri))))] |
| </span>{ |
| a.swap_bytes() |
| } |
| } |
| |
| <span class="attribute">#[allow(unused)] </span><span class="comment">//not used by fallback |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>add_and_shuffle(a: u128, b: u128) -> u128 { |
| <span class="kw">let </span>sum = add_by_64s(a.convert(), b.convert()); |
| shuffle(sum.convert()) |
| } |
| |
| <span class="attribute">#[allow(unused)] </span><span class="comment">//not used by fallbac |
| </span><span class="attribute">#[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>shuffle_and_add(base: u128, to_add: u128) -> u128 { |
| <span class="kw">let </span>shuffled: [u64; <span class="number">2</span>] = shuffle(base).convert(); |
| add_by_64s(shuffled, to_add.convert()).convert() |
| } |
| |
| <span class="attribute">#[cfg(all(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>), target_feature = <span class="string">"sse2"</span>, not(miri)))] |
| #[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>add_by_64s(a: [u64; <span class="number">2</span>], b: [u64; <span class="number">2</span>]) -> [u64; <span class="number">2</span>] { |
| <span class="kw">use </span>core::mem::transmute; |
| <span class="kw">unsafe </span>{ |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86"</span>)] |
| </span><span class="kw">use </span>core::arch::x86::<span class="kw-2">*</span>; |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">use </span>core::arch::x86_64::<span class="kw-2">*</span>; |
| transmute(_mm_add_epi64(transmute(a), transmute(b))) |
| } |
| } |
| |
| <span class="attribute">#[cfg(not(all(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>), target_feature = <span class="string">"sse2"</span>, not(miri))))] |
| #[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>add_by_64s(a: [u64; <span class="number">2</span>], b: [u64; <span class="number">2</span>]) -> [u64; <span class="number">2</span>] { |
| [a[<span class="number">0</span>].wrapping_add(b[<span class="number">0</span>]), a[<span class="number">1</span>].wrapping_add(b[<span class="number">1</span>])] |
| } |
| |
| <span class="attribute">#[cfg(all(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>), target_feature = <span class="string">"aes"</span>, not(miri)))] |
| #[allow(unused)] |
| #[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>aesenc(value: u128, xor: u128) -> u128 { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86"</span>)] |
| </span><span class="kw">use </span>core::arch::x86::<span class="kw-2">*</span>; |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">use </span>core::arch::x86_64::<span class="kw-2">*</span>; |
| <span class="kw">use </span>core::mem::transmute; |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>value = transmute(value); |
| transmute(_mm_aesenc_si128(value, transmute(xor))) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(any(target_arch = <span class="string">"arm"</span>, target_arch = <span class="string">"aarch64"</span>), target_feature = <span class="string">"crypto"</span>, not(miri), feature = <span class="string">"stdsimd"</span>))] |
| #[allow(unused)] |
| #[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>aesenc(value: u128, xor: u128) -> u128 { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"arm"</span>)] |
| </span><span class="kw">use </span>core::arch::arm::<span class="kw-2">*</span>; |
| <span class="attribute">#[cfg(target_arch = <span class="string">"aarch64"</span>)] |
| </span><span class="kw">use </span>core::arch::aarch64::<span class="kw-2">*</span>; |
| <span class="kw">use </span>core::mem::transmute; |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>value = transmute(value); |
| transmute(vaesmcq_u8(vaeseq_u8(value, transmute(xor)))) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>), target_feature = <span class="string">"aes"</span>, not(miri)))] |
| #[allow(unused)] |
| #[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>aesdec(value: u128, xor: u128) -> u128 { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86"</span>)] |
| </span><span class="kw">use </span>core::arch::x86::<span class="kw-2">*</span>; |
| <span class="attribute">#[cfg(target_arch = <span class="string">"x86_64"</span>)] |
| </span><span class="kw">use </span>core::arch::x86_64::<span class="kw-2">*</span>; |
| <span class="kw">use </span>core::mem::transmute; |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>value = transmute(value); |
| transmute(_mm_aesdec_si128(value, transmute(xor))) |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(any(target_arch = <span class="string">"arm"</span>, target_arch = <span class="string">"aarch64"</span>), target_feature = <span class="string">"crypto"</span>, not(miri), feature = <span class="string">"stdsimd"</span>))] |
| #[allow(unused)] |
| #[inline(always)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>aesdec(value: u128, xor: u128) -> u128 { |
| <span class="attribute">#[cfg(target_arch = <span class="string">"arm"</span>)] |
| </span><span class="kw">use </span>core::arch::arm::<span class="kw-2">*</span>; |
| <span class="attribute">#[cfg(target_arch = <span class="string">"aarch64"</span>)] |
| </span><span class="kw">use </span>core::arch::aarch64::<span class="kw-2">*</span>; |
| <span class="kw">use </span>core::mem::transmute; |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>value = transmute(value); |
| transmute(vaesimcq_u8(vaesdq_u8(value, transmute(xor)))) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>test { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::convert::Convert; |
| |
| <span class="comment">// This is code to search for the shuffle constant |
| // |
| //thread_local! { static MASK: Cell<u128> = Cell::new(0); } |
| // |
| // fn shuffle(a: u128) -> u128 { |
| // use std::intrinsics::transmute; |
| // #[cfg(target_arch = "x86")] |
| // use core::arch::x86::*; |
| // #[cfg(target_arch = "x86_64")] |
| // use core::arch::x86_64::*; |
| // MASK.with(|mask| { |
| // unsafe { transmute(_mm_shuffle_epi8(transmute(a), transmute(mask.get()))) } |
| // }) |
| // } |
| // |
| // #[test] |
| // fn find_shuffle() { |
| // use rand::prelude::*; |
| // use SliceRandom; |
| // use std::panic; |
| // use std::io::Write; |
| // |
| // let mut value: [u8; 16] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 ,13, 14, 15]; |
| // let mut rand = thread_rng(); |
| // let mut successful_list = HashMap::new(); |
| // for _attempt in 0..10000000 { |
| // rand.shuffle(&mut value); |
| // let test_val = value.convert(); |
| // MASK.with(|mask| { |
| // mask.set(test_val); |
| // }); |
| // if let Ok(successful) = panic::catch_unwind(|| { |
| // test_shuffle_does_not_collide_with_aes(); |
| // test_shuffle_moves_high_bits(); |
| // test_shuffle_moves_every_value(); |
| // //test_shuffle_does_not_loop(); |
| // value |
| // }) { |
| // let successful: u128 = successful.convert(); |
| // successful_list.insert(successful, iters_before_loop()); |
| // } |
| // } |
| // let write_file = File::create("/tmp/output").unwrap(); |
| // let mut writer = BufWriter::new(&write_file); |
| // |
| // for success in successful_list { |
| // writeln!(writer, "Found successful: {:x?} - {:?}", success.0, success.1); |
| // } |
| // } |
| // |
| // fn iters_before_loop() -> u32 { |
| // let numbered = 0x00112233_44556677_8899AABB_CCDDEEFF; |
| // let mut shuffled = shuffle(numbered); |
| // let mut count = 0; |
| // loop { |
| // // println!("{:>16x}", shuffled); |
| // if numbered == shuffled { |
| // break; |
| // } |
| // count += 1; |
| // shuffled = shuffle(shuffled); |
| // } |
| // count |
| // } |
| |
| </span><span class="attribute">#[cfg(all( |
| any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>), |
| target_feature = <span class="string">"ssse3"</span>, |
| target_feature = <span class="string">"aes"</span>, |
| not(miri) |
| ))] |
| #[test] |
| </span><span class="kw">fn </span>test_shuffle_does_not_collide_with_aes() { |
| <span class="kw">let </span><span class="kw-2">mut </span>value: [u8; <span class="number">16</span>] = [<span class="number">0</span>; <span class="number">16</span>]; |
| <span class="kw">let </span>zero_mask_enc = aesenc(<span class="number">0</span>, <span class="number">0</span>); |
| <span class="kw">let </span>zero_mask_dec = aesdec(<span class="number">0</span>, <span class="number">0</span>); |
| <span class="kw">for </span>index <span class="kw">in </span><span class="number">0</span>..<span class="number">16 </span>{ |
| value[index] = <span class="number">1</span>; |
| <span class="kw">let </span>excluded_positions_enc: [u8; <span class="number">16</span>] = aesenc(value.convert(), zero_mask_enc).convert(); |
| <span class="kw">let </span>excluded_positions_dec: [u8; <span class="number">16</span>] = aesdec(value.convert(), zero_mask_dec).convert(); |
| <span class="kw">let </span>actual_location: [u8; <span class="number">16</span>] = shuffle(value.convert()).convert(); |
| <span class="kw">for </span>pos <span class="kw">in </span><span class="number">0</span>..<span class="number">16 </span>{ |
| <span class="kw">if </span>actual_location[pos] != <span class="number">0 </span>{ |
| <span class="macro">assert_eq!</span>( |
| <span class="number">0</span>, excluded_positions_enc[pos], |
| <span class="string">"Forward Overlap between {:?} and {:?} at {}"</span>, |
| excluded_positions_enc, actual_location, index |
| ); |
| <span class="macro">assert_eq!</span>( |
| <span class="number">0</span>, excluded_positions_dec[pos], |
| <span class="string">"Reverse Overlap between {:?} and {:?} at {}"</span>, |
| excluded_positions_dec, actual_location, index |
| ); |
| } |
| } |
| value[index] = <span class="number">0</span>; |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_shuffle_contains_each_value() { |
| <span class="kw">let </span>value: [u8; <span class="number">16</span>] = <span class="number">0x00010203_04050607_08090A0B_0C0D0E0F_u128</span>.convert(); |
| <span class="kw">let </span>shuffled: [u8; <span class="number">16</span>] = shuffle(value.convert()).convert(); |
| <span class="kw">for </span>index <span class="kw">in </span><span class="number">0</span>..<span class="number">16_u8 </span>{ |
| <span class="macro">assert!</span>(shuffled.contains(<span class="kw-2">&</span>index), <span class="string">"Value is missing {}"</span>, index); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_shuffle_moves_every_value() { |
| <span class="kw">let </span><span class="kw-2">mut </span>value: [u8; <span class="number">16</span>] = [<span class="number">0</span>; <span class="number">16</span>]; |
| <span class="kw">for </span>index <span class="kw">in </span><span class="number">0</span>..<span class="number">16 </span>{ |
| value[index] = <span class="number">1</span>; |
| <span class="kw">let </span>shuffled: [u8; <span class="number">16</span>] = shuffle(value.convert()).convert(); |
| <span class="macro">assert_eq!</span>(<span class="number">0</span>, shuffled[index], <span class="string">"Value is not moved {}"</span>, index); |
| value[index] = <span class="number">0</span>; |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_shuffle_moves_high_bits() { |
| <span class="macro">assert!</span>( |
| shuffle(<span class="number">1</span>) > (<span class="number">1_u128 </span><< <span class="number">80</span>), |
| <span class="string">"Low bits must be moved to other half {:?} -> {:?}"</span>, |
| <span class="number">0</span>, |
| shuffle(<span class="number">1</span>) |
| ); |
| |
| <span class="macro">assert!</span>( |
| shuffle(<span class="number">1_u128 </span><< <span class="number">58</span>) >= (<span class="number">1_u128 </span><< <span class="number">64</span>), |
| <span class="string">"High bits must be moved to other half {:?} -> {:?}"</span>, |
| <span class="number">7</span>, |
| shuffle(<span class="number">1_u128 </span><< <span class="number">58</span>) |
| ); |
| <span class="macro">assert!</span>( |
| shuffle(<span class="number">1_u128 </span><< <span class="number">58</span>) < (<span class="number">1_u128 </span><< <span class="number">112</span>), |
| <span class="string">"High bits must not remain high {:?} -> {:?}"</span>, |
| <span class="number">7</span>, |
| shuffle(<span class="number">1_u128 </span><< <span class="number">58</span>) |
| ); |
| <span class="macro">assert!</span>( |
| shuffle(<span class="number">1_u128 </span><< <span class="number">64</span>) < (<span class="number">1_u128 </span><< <span class="number">64</span>), |
| <span class="string">"Low bits must be moved to other half {:?} -> {:?}"</span>, |
| <span class="number">8</span>, |
| shuffle(<span class="number">1_u128 </span><< <span class="number">64</span>) |
| ); |
| <span class="macro">assert!</span>( |
| shuffle(<span class="number">1_u128 </span><< <span class="number">64</span>) >= (<span class="number">1_u128 </span><< <span class="number">16</span>), |
| <span class="string">"Low bits must not remain low {:?} -> {:?}"</span>, |
| <span class="number">8</span>, |
| shuffle(<span class="number">1_u128 </span><< <span class="number">64</span>) |
| ); |
| |
| <span class="macro">assert!</span>( |
| shuffle(<span class="number">1_u128 </span><< <span class="number">120</span>) < (<span class="number">1_u128 </span><< <span class="number">50</span>), |
| <span class="string">"High bits must be moved to low half {:?} -> {:?}"</span>, |
| <span class="number">15</span>, |
| shuffle(<span class="number">1_u128 </span><< <span class="number">120</span>) |
| ); |
| } |
| |
| <span class="attribute">#[cfg(all( |
| any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>), |
| target_feature = <span class="string">"ssse3"</span>, |
| not(miri) |
| ))] |
| #[test] |
| </span><span class="kw">fn </span>test_shuffle_does_not_loop() { |
| <span class="kw">let </span>numbered = <span class="number">0x00112233_44556677_8899AABB_CCDDEEFF</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>shuffled = shuffle(numbered); |
| <span class="kw">for </span>count <span class="kw">in </span><span class="number">0</span>..<span class="number">100 </span>{ |
| <span class="comment">// println!("{:>16x}", shuffled); |
| </span><span class="macro">assert_ne!</span>(numbered, shuffled, <span class="string">"Equal after {} vs {:x}"</span>, count, shuffled); |
| shuffled = shuffle(shuffled); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="ahash" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
