JSTests/stress/dataview-jit-set-nan.js

//@ skip if $architecture == "mips"

"use strict";

function assert(b) {
    if (!b)
        throw new Error;
}

function test() {
    function storeLittleEndian(dv, index, value) {
        dv.setFloat32(index, value, true);
    }
    noInline(storeLittleEndian);

    function storeBigEndian(dv, index, value) {
        dv.setFloat32(index, value, false);
    }
    noInline(storeBigEndian);

    function store(dv, index, value, littleEndian) {
        dv.setFloat32(index, value, littleEndian);
    }
    noInline(store);

    let buffer = new ArrayBuffer(4);
    let arr = new Float32Array(buffer);
    let bits = new Uint32Array(buffer);
    let dv = new DataView(buffer);

    for (let i = 0; i < 10000; ++i) {
        storeLittleEndian(dv, 0, 1.5);
        assert(arr[0] === 1.5);

        storeLittleEndian(dv, 0, 12912.124123215122);
        assert(arr[0] === 12912.1240234375);
        assert(bits[0] === 0x4649c07f);

        storeLittleEndian(dv, 0, NaN);
        assert(isNaN(arr[0]));
        assert(bits[0] === 0x7FC00000);

        storeLittleEndian(dv, 0, 2.3879393e-38);
        assert(arr[0] === 2.387939260590663e-38);
        assert(bits[0] === 0x01020304);

        storeBigEndian(dv, 0, 2.3879393e-38);
        assert(arr[0] === 1.539989614439558e-36);
        assert(bits[0] === 0x04030201);
    }
}
test();