test262/implementation-contributed/javascriptcore/slowMicrobenchmarks/double-to-int32.js

// This microbenchmarks validates that the fix in https://webkit.org/b/170961
// does not regress the performance gains from r211670: <http://trac.webkit.org/changeset/211670>.
// r211670 reduces the size of operationToInt32SensibleSlow() for handling double numbers with
// binary exponent 31. Hence, this microbenchmark stresses doubleToIn32 conversion on
// numbers with binary exponents in the vicinity of 31.

let doubleValues = [
    2.147483648e8, // exp = 27
    2.147483648e9, // exp = 31
    2.147483648e10, // exp = 34
];

function test(q, r, s, t, u, v, w, x, y, z) {
    // Do a lot of double to int32 conversions to weigh more on the conversion.
    return q|0 + r|0 + s|0 + t|0 + u|0 + v|0 + w|0 + x|0 + y|0 + z|0;
}
noInline(test);

var result = 0;
let length = doubleValues.length;
for (var i = 0; i < 1000000; ++i) {
    for (var j = 0; j < length; j++) {
        var value = doubleValues[j];
        result |= test(value, value, value, value, value, value, value, value, value, value);
    }
}

if (result != -1932735284) {
    throw "Bad result: " + result;
}