| <!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/rand-0.8.5/src/distributions/integer.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>integer.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="icon" href="https://www.rust-lang.org/favicon.ico"></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="../../../rand/index.html"><div class="logo-container"> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 Developers of the Rand project. |
| // |
| // 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. |
| |
| </span><span class="doccomment">//! The implementations of the `Standard` distribution for integer types. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::distributions::{Distribution, Standard}; |
| <span class="kw">use </span><span class="kw">crate</span>::Rng; |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86"</span>, feature = <span class="string">"simd_support"</span>))] |
| </span><span class="kw">use </span>core::arch::x86::{__m128i, __m256i}; |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, feature = <span class="string">"simd_support"</span>))] |
| </span><span class="kw">use </span>core::arch::x86_64::{__m128i, __m256i}; |
| <span class="kw">use </span>core::num::{NonZeroU16, NonZeroU32, NonZeroU64, NonZeroU8, NonZeroUsize, |
| NonZeroU128}; |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] </span><span class="kw">use </span>packed_simd::<span class="kw-2">*</span>; |
| |
| <span class="kw">impl </span>Distribution<u8> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u8 { |
| rng.next_u32() <span class="kw">as </span>u8 |
| } |
| } |
| |
| <span class="kw">impl </span>Distribution<u16> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u16 { |
| rng.next_u32() <span class="kw">as </span>u16 |
| } |
| } |
| |
| <span class="kw">impl </span>Distribution<u32> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u32 { |
| rng.next_u32() |
| } |
| } |
| |
| <span class="kw">impl </span>Distribution<u64> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u64 { |
| rng.next_u64() |
| } |
| } |
| |
| <span class="kw">impl </span>Distribution<u128> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> u128 { |
| <span class="comment">// Use LE; we explicitly generate one value before the next. |
| </span><span class="kw">let </span>x = u128::from(rng.next_u64()); |
| <span class="kw">let </span>y = u128::from(rng.next_u64()); |
| (y << <span class="number">64</span>) | x |
| } |
| } |
| |
| <span class="kw">impl </span>Distribution<usize> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| #[cfg(any(target_pointer_width = <span class="string">"32"</span>, target_pointer_width = <span class="string">"16"</span>))] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> usize { |
| rng.next_u32() <span class="kw">as </span>usize |
| } |
| |
| <span class="attribute">#[inline] |
| #[cfg(target_pointer_width = <span class="string">"64"</span>)] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> usize { |
| rng.next_u64() <span class="kw">as </span>usize |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>impl_int_from_uint { |
| (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$uty</span>:ty) => { |
| <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ |
| rng.gen::<<span class="macro-nonterminal">$uty</span>>() <span class="kw">as </span><span class="macro-nonterminal">$ty |
| </span>} |
| } |
| }; |
| } |
| |
| <span class="macro">impl_int_from_uint! </span>{ i8, u8 } |
| <span class="macro">impl_int_from_uint! </span>{ i16, u16 } |
| <span class="macro">impl_int_from_uint! </span>{ i32, u32 } |
| <span class="macro">impl_int_from_uint! </span>{ i64, u64 } |
| <span class="macro">impl_int_from_uint! </span>{ i128, u128 } |
| <span class="macro">impl_int_from_uint! </span>{ isize, usize } |
| |
| <span class="macro">macro_rules! </span>impl_nzint { |
| (<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$new</span>:path) => { |
| <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Standard { |
| <span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ |
| <span class="kw">loop </span>{ |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(nz) = <span class="macro-nonterminal">$new</span>(rng.gen()) { |
| <span class="kw">break </span>nz; |
| } |
| } |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">impl_nzint!</span>(NonZeroU8, NonZeroU8::new); |
| <span class="macro">impl_nzint!</span>(NonZeroU16, NonZeroU16::new); |
| <span class="macro">impl_nzint!</span>(NonZeroU32, NonZeroU32::new); |
| <span class="macro">impl_nzint!</span>(NonZeroU64, NonZeroU64::new); |
| <span class="macro">impl_nzint!</span>(NonZeroU128, NonZeroU128::new); |
| <span class="macro">impl_nzint!</span>(NonZeroUsize, NonZeroUsize::new); |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span><span class="macro">macro_rules! </span>simd_impl { |
| ($((<span class="macro-nonterminal">$intrinsic</span>:ident, <span class="macro-nonterminal">$vec</span>:ty),)+) => {$( |
| <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$intrinsic</span>> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$intrinsic </span>{ |
| <span class="macro-nonterminal">$intrinsic::from_bits</span>(rng.gen::<<span class="macro-nonterminal">$vec</span>>()) |
| } |
| } |
| )+}; |
| |
| (<span class="macro-nonterminal">$bits</span>:expr,) => {}; |
| (<span class="macro-nonterminal">$bits</span>:expr, <span class="macro-nonterminal">$ty</span>:ty, $(<span class="macro-nonterminal">$ty_more</span>:ty,)<span class="kw-2">*</span>) => { |
| <span class="macro">simd_impl!</span>(<span class="macro-nonterminal">$bits</span>, $(<span class="macro-nonterminal">$ty_more</span>,)<span class="kw-2">*</span>); |
| |
| <span class="kw">impl </span>Distribution<<span class="macro-nonterminal">$ty</span>> <span class="kw">for </span>Standard { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> <span class="macro-nonterminal">$ty </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>vec: <span class="macro-nonterminal">$ty </span>= Default::default(); |
| <span class="kw">unsafe </span>{ |
| <span class="kw">let </span>ptr = <span class="kw-2">&mut </span>vec; |
| <span class="kw">let </span>b_ptr = <span class="kw-2">&mut *</span>(ptr <span class="kw">as </span><span class="kw-2">*mut </span><span class="macro-nonterminal">$ty </span><span class="kw">as </span><span class="kw-2">*mut </span>[u8; <span class="macro-nonterminal">$bits</span>/<span class="number">8</span>]); |
| rng.fill_bytes(b_ptr); |
| } |
| vec.to_le() |
| } |
| } |
| }; |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span><span class="macro">simd_impl!</span>(<span class="number">16</span>, u8x2, i8x2,); |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span><span class="macro">simd_impl!</span>(<span class="number">32</span>, u8x4, i8x4, u16x2, i16x2,); |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span><span class="macro">simd_impl!</span>(<span class="number">64</span>, u8x8, i8x8, u16x4, i16x4, u32x2, i32x2,); |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span><span class="macro">simd_impl!</span>(<span class="number">128</span>, u8x16, i8x16, u16x8, i16x8, u32x4, i32x4, u64x2, i64x2,); |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span><span class="macro">simd_impl!</span>(<span class="number">256</span>, u8x32, i8x32, u16x16, i16x16, u32x8, i32x8, u64x4, i64x4,); |
| <span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span><span class="macro">simd_impl!</span>(<span class="number">512</span>, u8x64, i8x64, u16x32, i16x32, u32x16, i32x16, u64x8, i64x8,); |
| <span class="attribute">#[cfg(all( |
| feature = <span class="string">"simd_support"</span>, |
| any(target_arch = <span class="string">"x86"</span>, target_arch = <span class="string">"x86_64"</span>) |
| ))] |
| </span><span class="macro">simd_impl!</span>((__m128i, u8x16), (__m256i, u8x32),); |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_integers() { |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">806</span>); |
| |
| rng.sample::<isize, <span class="kw">_</span>>(Standard); |
| rng.sample::<i8, <span class="kw">_</span>>(Standard); |
| rng.sample::<i16, <span class="kw">_</span>>(Standard); |
| rng.sample::<i32, <span class="kw">_</span>>(Standard); |
| rng.sample::<i64, <span class="kw">_</span>>(Standard); |
| rng.sample::<i128, <span class="kw">_</span>>(Standard); |
| |
| rng.sample::<usize, <span class="kw">_</span>>(Standard); |
| rng.sample::<u8, <span class="kw">_</span>>(Standard); |
| rng.sample::<u16, <span class="kw">_</span>>(Standard); |
| rng.sample::<u32, <span class="kw">_</span>>(Standard); |
| rng.sample::<u64, <span class="kw">_</span>>(Standard); |
| rng.sample::<u128, <span class="kw">_</span>>(Standard); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>value_stability() { |
| <span class="kw">fn </span>test_samples<T: Copy + core::fmt::Debug + PartialEq>(zero: T, expected: <span class="kw-2">&</span>[T]) |
| <span class="kw">where </span>Standard: Distribution<T> { |
| <span class="kw">let </span><span class="kw-2">mut </span>rng = <span class="kw">crate</span>::test::rng(<span class="number">807</span>); |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [zero; <span class="number">3</span>]; |
| <span class="kw">for </span>x <span class="kw">in </span><span class="kw-2">&mut </span>buf { |
| <span class="kw-2">*</span>x = rng.sample(Standard); |
| } |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf, expected); |
| } |
| |
| test_samples(<span class="number">0u8</span>, <span class="kw-2">&</span>[<span class="number">9</span>, <span class="number">247</span>, <span class="number">111</span>]); |
| test_samples(<span class="number">0u16</span>, <span class="kw-2">&</span>[<span class="number">32265</span>, <span class="number">42999</span>, <span class="number">38255</span>]); |
| test_samples(<span class="number">0u32</span>, <span class="kw-2">&</span>[<span class="number">2220326409</span>, <span class="number">2575017975</span>, <span class="number">2018088303</span>]); |
| test_samples(<span class="number">0u64</span>, <span class="kw-2">&</span>[ |
| <span class="number">11059617991457472009</span>, |
| <span class="number">16096616328739788143</span>, |
| <span class="number">1487364411147516184</span>, |
| ]); |
| test_samples(<span class="number">0u128</span>, <span class="kw-2">&</span>[ |
| <span class="number">296930161868957086625409848350820761097</span>, |
| <span class="number">145644820879247630242265036535529306392</span>, |
| <span class="number">111087889832015897993126088499035356354</span>, |
| ]); |
| <span class="attribute">#[cfg(any(target_pointer_width = <span class="string">"32"</span>, target_pointer_width = <span class="string">"16"</span>))] |
| </span>test_samples(<span class="number">0usize</span>, <span class="kw-2">&</span>[<span class="number">2220326409</span>, <span class="number">2575017975</span>, <span class="number">2018088303</span>]); |
| <span class="attribute">#[cfg(target_pointer_width = <span class="string">"64"</span>)] |
| </span>test_samples(<span class="number">0usize</span>, <span class="kw-2">&</span>[ |
| <span class="number">11059617991457472009</span>, |
| <span class="number">16096616328739788143</span>, |
| <span class="number">1487364411147516184</span>, |
| ]); |
| |
| test_samples(<span class="number">0i8</span>, <span class="kw-2">&</span>[<span class="number">9</span>, -<span class="number">9</span>, <span class="number">111</span>]); |
| <span class="comment">// Skip further i* types: they are simple reinterpretation of u* samples |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"simd_support"</span>)] |
| </span>{ |
| <span class="comment">// We only test a sub-set of types here and make assumptions about the rest. |
| |
| </span>test_samples(u8x2::default(), <span class="kw-2">&</span>[ |
| u8x2::new(<span class="number">9</span>, <span class="number">126</span>), |
| u8x2::new(<span class="number">247</span>, <span class="number">167</span>), |
| u8x2::new(<span class="number">111</span>, <span class="number">149</span>), |
| ]); |
| test_samples(u8x4::default(), <span class="kw-2">&</span>[ |
| u8x4::new(<span class="number">9</span>, <span class="number">126</span>, <span class="number">87</span>, <span class="number">132</span>), |
| u8x4::new(<span class="number">247</span>, <span class="number">167</span>, <span class="number">123</span>, <span class="number">153</span>), |
| u8x4::new(<span class="number">111</span>, <span class="number">149</span>, <span class="number">73</span>, <span class="number">120</span>), |
| ]); |
| test_samples(u8x8::default(), <span class="kw-2">&</span>[ |
| u8x8::new(<span class="number">9</span>, <span class="number">126</span>, <span class="number">87</span>, <span class="number">132</span>, <span class="number">247</span>, <span class="number">167</span>, <span class="number">123</span>, <span class="number">153</span>), |
| u8x8::new(<span class="number">111</span>, <span class="number">149</span>, <span class="number">73</span>, <span class="number">120</span>, <span class="number">68</span>, <span class="number">171</span>, <span class="number">98</span>, <span class="number">223</span>), |
| u8x8::new(<span class="number">24</span>, <span class="number">121</span>, <span class="number">1</span>, <span class="number">50</span>, <span class="number">13</span>, <span class="number">46</span>, <span class="number">164</span>, <span class="number">20</span>), |
| ]); |
| |
| test_samples(i64x8::default(), <span class="kw-2">&</span>[ |
| i64x8::new( |
| -<span class="number">7387126082252079607</span>, |
| -<span class="number">2350127744969763473</span>, |
| <span class="number">1487364411147516184</span>, |
| <span class="number">7895421560427121838</span>, |
| <span class="number">602190064936008898</span>, |
| <span class="number">6022086574635100741</span>, |
| -<span class="number">5080089175222015595</span>, |
| -<span class="number">4066367846667249123</span>, |
| ), |
| i64x8::new( |
| <span class="number">9180885022207963908</span>, |
| <span class="number">3095981199532211089</span>, |
| <span class="number">6586075293021332726</span>, |
| <span class="number">419343203796414657</span>, |
| <span class="number">3186951873057035255</span>, |
| <span class="number">5287129228749947252</span>, |
| <span class="number">444726432079249540</span>, |
| -<span class="number">1587028029513790706</span>, |
| ), |
| i64x8::new( |
| <span class="number">6075236523189346388</span>, |
| <span class="number">1351763722368165432</span>, |
| -<span class="number">6192309979959753740</span>, |
| -<span class="number">7697775502176768592</span>, |
| -<span class="number">4482022114172078123</span>, |
| <span class="number">7522501477800909500</span>, |
| -<span class="number">1837258847956201231</span>, |
| -<span class="number">586926753024886735</span>, |
| ), |
| ]); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="rand" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
