sin vs math.sin benchmark

buildandrun.sh

./node_modules/.bin/asc -O3 --use Math=JSMath --runtime none test.ts -o test.wasm
node test.js

test.js

async function test() {
    const mod = await WebAssembly.instantiate(require('fs').readFileSync('test.wasm'), {

        Math: Math
    });
    
    const count = 500000;
    const inc = (Math.PI / 180);
    let start = new Date().getTime();
    for(var n=0;n<count * Math.PI;n+=inc) {
        mod.instance.exports.mathsin(n);
    }
    console.log('mathsin', (new Date().getTime()-start));

    start = new Date().getTime();
    for(var n=0;n<count * Math.PI;n+=inc) {
        mod.instance.exports.sin(n);
    }
    console.log('sin', (new Date().getTime()-start));
}

test();

test.ts

export const PI: f32 = 3.141592653589793;
export function sin(x: f32): f32 {
  // By Max Graey ( https://github.com/petersalomonsen/javascriptmusic/issues/2#issuecomment-469419609 )
  var y: f32, z: f32;
  x *= 1 / PI;
  y  = floor(x);
  z  = x - y;
  z *= 1.0 - z;
  z *= 3.6 * z + 3.1;
  return select(-z, z, <i32>y & 1);
}

export function mathsin(val: f64): f64 {
    return Math.sin(val);
}