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| author | johannst <johannst@users.noreply.github.com> | 2023-12-05 22:08:06 +0000 |
|---|---|---|
| committer | johannst <johannst@users.noreply.github.com> | 2023-12-05 22:08:06 +0000 |
| commit | 2294180c3778d0fcfa877818e98c420fcd54bb8a (patch) | |
| tree | 8240452d6b80d397f1b5a9425c1a986c20e710e5 /src/fib/fib.rs.html | |
| parent | e37c8e0f9319e3df3ff801f5a38f4717a8a20b28 (diff) | |
| download | juicebox-asm-2294180c3778d0fcfa877818e98c420fcd54bb8a.tar.gz juicebox-asm-2294180c3778d0fcfa877818e98c420fcd54bb8a.zip | |
deploy: 7e98f5def5942969f97f5f015e7fb8417793d132
Diffstat (limited to 'src/fib/fib.rs.html')
| -rw-r--r-- | src/fib/fib.rs.html | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/fib/fib.rs.html b/src/fib/fib.rs.html new file mode 100644 index 0000000..87a1bbf --- /dev/null +++ b/src/fib/fib.rs.html @@ -0,0 +1,157 @@ +<!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 `examples/fib.rs`."><title>fib.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" 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src="../../static.files/main-c5bd66d33317d69f.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-5d8b3c7633ad77ba.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"></nav><main><nav class="sub"><a class="sub-logo-container" href="../../fib/index.html"><img class="rust-logo" src="../../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><form class="search-form"><span></span><input class="search-input" name="search" aria-label="Run search in the documentation" 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="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a> +<a href="#2" id="2">2</a> +<a href="#3" id="3">3</a> +<a href="#4" id="4">4</a> +<a href="#5" id="5">5</a> +<a href="#6" id="6">6</a> +<a href="#7" id="7">7</a> +<a href="#8" id="8">8</a> +<a href="#9" id="9">9</a> +<a href="#10" id="10">10</a> +<a href="#11" id="11">11</a> +<a href="#12" id="12">12</a> +<a href="#13" id="13">13</a> +<a href="#14" id="14">14</a> +<a href="#15" id="15">15</a> +<a href="#16" id="16">16</a> +<a href="#17" id="17">17</a> +<a href="#18" 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Fibonacci example. +//! +//! Jit compile a function at runtime (generate native host code) to compute the fibonacci sequence +//! to demonstrate the [`juicebox_asm`] crate. + +</span><span class="kw">use </span>juicebox_asm::prelude::<span class="kw-2">*</span>; +<span class="kw">use </span>juicebox_asm::Runtime; + +<span class="kw">const fn </span>fib_rs(n: u64) -> u64 { + <span class="kw">match </span>n { + <span class="number">0 </span>=> <span class="number">0</span>, + <span class="number">1 </span>=> <span class="number">1</span>, + <span class="kw">_ </span>=> fib_rs(n - <span class="number">2</span>) + fib_rs(n - <span class="number">1</span>), + } +} + +<span class="kw">fn </span>main() { + <span class="kw">let </span><span class="kw-2">mut </span>asm = Asm::new(); + + <span class="kw">let </span><span class="kw-2">mut </span>lp = Label::new(); + <span class="kw">let </span><span class="kw-2">mut </span>end = Label::new(); + + <span class="comment">// Reference implementation: + // + // int fib(int n) { + // int tmp = 0; + // int prv = 1; + // int sum = 0; + // loop: + // if (n == 0) goto end; + // tmp = sum; + // sum += prv; + // prv = tmp; + // --n; + // goto loop; + // end: + // return sum; + // } + + // SystemV abi: + // rdi -> first argument + // rax -> return value + </span><span class="kw">let </span>n = Reg64::rdi; + <span class="kw">let </span>sum = Reg64::rax; + + <span class="kw">let </span>tmp = Reg64::rcx; + <span class="kw">let </span>prv = Reg64::rbx; + + asm.mov(tmp, Imm64::from(<span class="number">0</span>)); + asm.mov(prv, Imm64::from(<span class="number">1</span>)); + asm.mov(sum, Imm64::from(<span class="number">0</span>)); + + asm.bind(<span class="kw-2">&mut </span>lp); + asm.test(n, n); + asm.jz(<span class="kw-2">&mut </span>end); + asm.mov(tmp, sum); + asm.add(sum, prv); + asm.mov(prv, tmp); + asm.dec(n); + asm.jmp(<span class="kw-2">&mut </span>lp); + asm.bind(<span class="kw-2">&mut </span>end); + asm.ret(); + + <span class="comment">// Write out JIT code for visualization. + // Disassemble for example with `ndisasm -b 64 jit.asm`. + </span><span class="kw">let </span>code = asm.into_code(); + std::fs::write(<span class="string">"jit.asm"</span>, <span class="kw-2">&</span>code).unwrap(); + + <span class="comment">// Move code into executable page and get function pointer to it. + </span><span class="kw">let </span><span class="kw-2">mut </span>rt = Runtime::new(); + <span class="kw">let </span>fib = <span class="kw">unsafe </span>{ rt.add_code::<<span class="kw">extern </span><span class="string">"C" </span><span class="kw">fn</span>(u64) -> u64>(code) }; + + <span class="kw">for </span>n <span class="kw">in </span><span class="number">0</span>..<span class="number">15 </span>{ + <span class="kw">let </span>fib_jit = fib(n); + <span class="macro">println!</span>(<span class="string">"fib({}) = {}"</span>, n, fib_jit); + <span class="macro">assert_eq!</span>(fib_jit, fib_rs(n)); + } +} +</code></pre></div></section></main></body></html>
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