Created
February 15, 2018 12:09
-
-
Save nhusher/d69428f95a977d1b3d9314b2aa8304bd to your computer and use it in GitHub Desktop.
very simple gcd in wasm
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #![feature(lang_items)] | |
| #![no_std] | |
| #[no_mangle] | |
| pub extern "C" fn gcd(mut n: i32, mut m: i32) -> i32 { | |
| assert!(n != 0 && m != 0); | |
| while m != 0 { | |
| if m < n { | |
| let t = m; | |
| m = n; | |
| n = t; | |
| } | |
| m = m % n; | |
| } | |
| n | |
| } | |
| // needed for no_std | |
| #[lang = "panic_fmt"] | |
| #[no_mangle] | |
| pub extern fn rust_begin_panic(_msg: core::fmt::Arguments, | |
| _file: &'static str, | |
| _line: u32, | |
| _column: u32) -> ! { | |
| loop {} | |
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset='utf-8'> | |
| <title>wasm wasm wasm</title> | |
| </head> | |
| <body> | |
| <form id='form'> | |
| <div> | |
| <label for='a'>Number A</label> | |
| <input id='a' name='a' /> | |
| </div> | |
| <div> | |
| <label for='b'>Number B</label> | |
| <input id='b' name='b' /> | |
| </div> | |
| <div> | |
| <button type='submit'>Compute</button> | |
| </div> | |
| <div id='result'></div> | |
| </form> | |
| <script> | |
| const gcdWasm = fetch('gcd.wasm').then(response => | |
| response.arrayBuffer() | |
| ).then(bytes => | |
| WebAssembly.instantiate(bytes, {}) | |
| ).then(results => results.instance.exports.gcd); | |
| const form = document.querySelector('#form') | |
| const result = document.querySelector('#result') | |
| form.addEventListener('submit', evt => { | |
| evt.preventDefault() | |
| const d = new FormData(form) | |
| const a = parseInt(d.get('a'), 10) | |
| const b = parseInt(d.get('b'), 10) | |
| gcdWasm.then(fn => { | |
| result.innerHTML = `The GCD of those two numbers is ${fn(a, b)}` | |
| }) | |
| }) | |
| </script> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment