JSTests/stress/arith-abs-integer-range-optimization.js

function negativeRange(results)
{
    for (var i = -1; i > -10; --i) {
        results[Math.abs(i)] = i;
    }
}
noInline(negativeRange);

for (var i = 0; i < 1e4; ++i) {
    var results = [];
    negativeRange(results);
    if (results.length != 10)
        throw "Wrong result length: " + results.length;
    for (var j = 0; j < 10; ++j) {
        if (j < 1) {
            if (results[j] !== undefined)
                throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
            continue;
        }
        if (results[j] !== -j)
            throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
    }
}

function negativeRangeIncludingZero(results)
{
    for (var i = 0; i > -10; --i) {
        results[Math.abs(i)] = i;
    }
}
noInline(negativeRangeIncludingZero);

for (var i = 0; i < 1e4; ++i) {
    var results = [];
    negativeRangeIncludingZero(results);
    if (results.length != 10)
        throw "Wrong result length: " + results.length;
    for (var j = 0; j < 10; ++j) {
        if (results[j] !== -j)
            throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
    }
}

function negativeRangeWithOverflow(results, limit)
{
    var i = -2147483648 + 10;
    do {
        results.push(Math.abs(i));
        --i;
    } while (i !== limit);
}
noInline(negativeRangeWithOverflow);

// First, we warm up without overflow.
for (var i = 0; i < 1e4; ++i) {
    var results = [];
    negativeRangeWithOverflow(results, -2147483647);
    if (results.length != 9)
        throw "Wrong result length: " + results.length;
    for (var j = 0; j < 9; ++j) {
        if (results[j] !== 2147483638 + j)
            throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
    }
}

// Then we overflow.
for (var i = 0; i < 1e4; ++i) {
    var results = [];
    negativeRangeWithOverflow(results, -2147483648);
    if (results.length != 10)
        throw "Wrong result length: " + results.length;
    for (var j = 0; j < 10; ++j) {
        if (results[j] !== 2147483638 + j)
            throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
    }
}

function positiveRange(results)
{
    for (var i = 1; i < 10; ++i) {
        results[Math.abs(i)] = i;
    }
}
noInline(positiveRange);

for (var i = 0; i < 1e4; ++i) {
    var results = [];
    positiveRange(results);
    if (results.length != 10)
        throw "Wrong result length: " + results.length;
    for (var j = 0; j < 10; ++j) {
        if (j < 1) {
            if (results[j] !== undefined)
                throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
            continue;
        }
        if (results[j] !== j)
            throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
    }
}

function positiveRangeIncludingZero(results)
{
    for (var i = 0; i < 10; ++i) {
        results[Math.abs(i)] = i;
    }
}
noInline(positiveRangeIncludingZero);

for (var i = 0; i < 1e4; ++i) {
    var results = [];
    positiveRangeIncludingZero(results);
    if (results.length != 10)
        throw "Wrong result length: " + results.length;
    for (var j = 0; j < 10; ++j) {
        if (results[j] !== j)
            throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
    }
}

function rangeWithoutOverflow(results)
{
    for (var i = -10; i < 10; ++i) {
        results[i] = Math.abs(i);
    }
}
noInline(rangeWithoutOverflow);

for (var i = 0; i < 1e4; ++i) {
    var results = [];
    rangeWithoutOverflow(results);
    if (results.length != 10)
        throw "Wrong result length: " + results.length;
    for (var j = -10; j < 10; ++j) {
        var expected = (j < 0) ? -j : j;
        if (results[j] !== expected)
            throw "Wrong result, results[j] = " + results[j] + " at j = " + j;
    }
}