Created
August 17, 2018 05:30
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wasm
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script> | |
| const fib = n => { | |
| switch (n) { | |
| case 0: | |
| return 0; | |
| break; | |
| case 1: | |
| case 2: | |
| return 1; | |
| break; | |
| default: | |
| return fib(n - 1) + fib(n - 2); | |
| } | |
| }; | |
| request = new XMLHttpRequest(); | |
| request.open('GET', 'hello_world.gc.wasm'); | |
| request.responseType = 'arraybuffer'; | |
| request.send(); | |
| request.onload = function() { | |
| const bytes = request.response; | |
| WebAssembly.instantiate(bytes).then(results => { | |
| const instance = results.instance; | |
| console.log('measuring performance of recursive fib(50)'); | |
| let t0 = performance.now(); | |
| fib(50); | |
| let t1 = performance.now(); | |
| console.log("javascript version took: " + (t1 - t0) + " milliseconds.") | |
| t0 = performance.now(); | |
| instance.exports.fib(50); | |
| t1 = performance.now(); | |
| console.log("rust version took: " + (t1 - t0) + " milliseconds.") | |
| }); | |
| }; | |
| </script> | |
| </head> | |
| <body></body> | |
| </html> |
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| #![feature(custom_attribute)] | |
| #![feature(repr_transparent)] | |
| use std::ffi::CString; | |
| use std::os::raw::c_char; | |
| #[wasm_bindgen] | |
| #[no_mangle] | |
| pub fn fib(n: i32) -> i32{ | |
| match n { | |
| 0 => 0, | |
| 1 => 1, | |
| _ => fib(n-1) + fib(n-2), | |
| } | |
| } |
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| build: | |
| cargo +nightly build --target wasm32-unknown-unknown --release | |
| wasm-gc target/wasm32-unknown-unknown/release/hello_world.wasm -o hello_world.gc.wasm | |
| install: | |
| rustup update | |
| rustup toolchain install nightly | |
| rustup target add wasm32-unknown-unknown --toolchain nightly |
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