| <!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/bitpacking-0.8.4/src/bitpacker4x_simple.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>bitpacker4x_simple.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="../../bitpacking/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="../../bitpacking/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 super</span>::{BitPacker, UnsafeBitPacker}; |
| |
| <span class="kw">const </span>BLOCK_LEN: usize = <span class="number">32 </span>* <span class="number">4</span>; |
| |
| <span class="kw">mod </span>scalar { |
| <span class="kw">use </span><span class="kw">super</span>::BLOCK_LEN; |
| <span class="kw">use </span>std::ptr; |
| |
| <span class="kw">type </span>DataType = [u32; <span class="number">4</span>]; |
| |
| <span class="kw">fn </span>set1(el: i32) -> DataType { |
| [el <span class="kw">as </span>u32; <span class="number">4</span>] |
| } |
| |
| <span class="kw">fn </span>right_shift_32(el: DataType, shift: i32) -> DataType { |
| [ |
| el[<span class="number">0</span>] >> shift, |
| el[<span class="number">1</span>] >> shift, |
| el[<span class="number">2</span>] >> shift, |
| el[<span class="number">3</span>] >> shift, |
| ] |
| } |
| |
| <span class="kw">fn </span>left_shift_32(el: DataType, shift: i32) -> DataType { |
| [ |
| el[<span class="number">0</span>] << shift, |
| el[<span class="number">1</span>] << shift, |
| el[<span class="number">2</span>] << shift, |
| el[<span class="number">3</span>] << shift, |
| ] |
| } |
| |
| <span class="kw">fn </span>op_or(left: DataType, right: DataType) -> DataType { |
| [ |
| left[<span class="number">0</span>] | right[<span class="number">0</span>], |
| left[<span class="number">1</span>] | right[<span class="number">1</span>], |
| left[<span class="number">2</span>] | right[<span class="number">2</span>], |
| left[<span class="number">3</span>] | right[<span class="number">3</span>], |
| ] |
| } |
| |
| <span class="kw">fn </span>op_and(left: DataType, right: DataType) -> DataType { |
| [ |
| left[<span class="number">0</span>] & right[<span class="number">0</span>], |
| left[<span class="number">1</span>] & right[<span class="number">1</span>], |
| left[<span class="number">2</span>] & right[<span class="number">2</span>], |
| left[<span class="number">3</span>] & right[<span class="number">3</span>], |
| ] |
| } |
| |
| <span class="kw">unsafe fn </span>load_unaligned(addr: <span class="kw-2">*const </span>DataType) -> DataType { |
| ptr::read_unaligned(addr) |
| } |
| |
| <span class="kw">unsafe fn </span>store_unaligned(addr: <span class="kw-2">*mut </span>DataType, data: DataType) { |
| ptr::write_unaligned(addr, data); |
| } |
| |
| <span class="kw">fn </span>or_collapse_to_u32(accumulator: DataType) -> u32 { |
| (accumulator[<span class="number">0</span>] | accumulator[<span class="number">1</span>]) | (accumulator[<span class="number">2</span>] | accumulator[<span class="number">3</span>]) |
| } |
| |
| <span class="kw">fn </span>compute_delta(curr: DataType, prev: DataType) -> DataType { |
| [ |
| curr[<span class="number">0</span>].wrapping_sub(prev[<span class="number">3</span>]), |
| curr[<span class="number">1</span>].wrapping_sub(curr[<span class="number">0</span>]), |
| curr[<span class="number">2</span>].wrapping_sub(curr[<span class="number">1</span>]), |
| curr[<span class="number">3</span>].wrapping_sub(curr[<span class="number">2</span>]), |
| ] |
| } |
| |
| <span class="kw">fn </span>integrate_delta(offset: DataType, delta: DataType) -> DataType { |
| <span class="kw">let </span>el0 = offset[<span class="number">3</span>].wrapping_add(delta[<span class="number">0</span>]); |
| <span class="kw">let </span>el1 = el0.wrapping_add(delta[<span class="number">1</span>]); |
| <span class="kw">let </span>el2 = el1.wrapping_add(delta[<span class="number">2</span>]); |
| <span class="kw">let </span>el3 = el2.wrapping_add(delta[<span class="number">3</span>]); |
| [el0, el1, el2, el3] |
| } |
| |
| <span class="macro">declare_bitpacker_simple!</span>(cfg(any(debug, not(debug)))); |
| } |
| |
| <span class="doccomment">/// `BitPacker4x` packs integers in groups of 4. This gives an opportunity |
| /// to leverage `SSE3` instructions to encode and decode the stream. |
| /// |
| /// One block must contain `128 integers`. |
| </span><span class="attribute">#[derive(Clone, Copy)] |
| </span><span class="kw">pub struct </span>BitPacker4x; |
| |
| <span class="kw">impl </span>BitPacker <span class="kw">for </span>BitPacker4x { |
| <span class="kw">const </span>BLOCK_LEN: usize = BLOCK_LEN; |
| |
| <span class="doccomment">/// Returns the best available implementation for the current CPU. |
| </span><span class="kw">fn </span>new() -> <span class="self">Self </span>{ |
| BitPacker4x |
| } |
| |
| <span class="kw">fn </span>compress(<span class="kw-2">&</span><span class="self">self</span>, decompressed: <span class="kw-2">&</span>[u32], compressed: <span class="kw-2">&mut </span>[u8], num_bits: u8) -> usize { |
| <span class="kw">unsafe </span>{ scalar::UnsafeBitPackerImpl::compress(decompressed, compressed, num_bits) } |
| } |
| |
| <span class="kw">fn </span>compress_sorted( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| initial: u32, |
| decompressed: <span class="kw-2">&</span>[u32], |
| compressed: <span class="kw-2">&mut </span>[u8], |
| num_bits: u8, |
| ) -> usize { |
| <span class="kw">unsafe </span>{ |
| scalar::UnsafeBitPackerImpl::compress_sorted( |
| initial, |
| decompressed, |
| compressed, |
| num_bits, |
| ) |
| } |
| } |
| |
| <span class="kw">fn </span>decompress(<span class="kw-2">&</span><span class="self">self</span>, compressed: <span class="kw-2">&</span>[u8], decompressed: <span class="kw-2">&mut </span>[u32], num_bits: u8) -> usize { |
| <span class="kw">unsafe </span>{ scalar::UnsafeBitPackerImpl::decompress(compressed, decompressed, num_bits) } |
| } |
| |
| <span class="kw">fn </span>decompress_sorted( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| initial: u32, |
| compressed: <span class="kw-2">&</span>[u8], |
| decompressed: <span class="kw-2">&mut </span>[u32], |
| num_bits: u8, |
| ) -> usize { |
| <span class="kw">unsafe </span>{ |
| scalar::UnsafeBitPackerImpl::decompress_sorted( |
| initial, |
| compressed, |
| decompressed, |
| num_bits, |
| ) |
| } |
| } |
| |
| <span class="kw">fn </span>num_bits(<span class="kw-2">&</span><span class="self">self</span>, decompressed: <span class="kw-2">&</span>[u32]) -> u8 { |
| <span class="kw">unsafe </span>{ scalar::UnsafeBitPackerImpl::num_bits(decompressed) } |
| } |
| |
| <span class="kw">fn </span>num_bits_sorted(<span class="kw-2">&</span><span class="self">self</span>, initial: u32, decompressed: <span class="kw-2">&</span>[u32]) -> u8 { |
| <span class="kw">unsafe </span>{ scalar::UnsafeBitPackerImpl::num_bits_sorted(initial, decompressed) } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="bitpacking" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
