JSTests/stress/arith-modulo-node-behaviors.js

//@ skip if $hostOS == "windows"

// Verify that the dividend propagate the NeedsNegZero if the dividend requires it.
function moduloWithNegativeZeroDividend(a, b, c)
{
    var temp = a * b;
    return temp % c;
}
noInline(moduloWithNegativeZeroDividend);

// Warm up with integers. The test for NegZero should not be eliminated here.
for (var i = 1; i < 1e4; ++i) {
    var result = moduloWithNegativeZeroDividend(i, 5, 5);
    if (result !== 0)
        throw "moduloWithNegativeZeroDividend(i, 5, 5), returned: " + result;
}

for (var i = 1; i < 1e4; ++i) {
    // Produce negative zero in the multiplication.
    var result = moduloWithNegativeZeroDividend(-i, 0, 2);
    if (!(result === 0 && (1/result) === -Infinity))
        throw "moduloWithNegativeZeroDividend(-i, 0, 2) failed, returned: " + result;

    // A negative dividend can produce negative zero results.
    var result = moduloWithNegativeZeroDividend(-i, 5, 5);
    if (!(result === 0 && (1/result) === -Infinity))
        throw "moduloWithNegativeZeroDividend(-i, 5, 5) failed, returned: " + result;
}

// Edge cases.
for (var i = 1; i < 1e4; ++i) {
    var result = moduloWithNegativeZeroDividend(-i, 0, Infinity);
    if (!(result === 0 && (1/result) === -Infinity))
        throw "moduloWithNegativeZeroDividend(-i, 0, Infinity) failed, returned: " + result;

    var result = moduloWithNegativeZeroDividend(-i, 0, -Infinity);
    if (!(result === 0 && (1/result) === -Infinity))
        throw "moduloWithNegativeZeroDividend(-i, 0, -Infinity) failed, returned: " + result;

    var result = moduloWithNegativeZeroDividend(-i, 0, NaN);
    if (result === result)
        throw "moduloWithNegativeZeroDividend(-i, 0, NaN) failed, returned: " + result;
}


// In this case, the negative zero is irrelevant. The Neg Zero check can be eliminated.
function moduloWithUnusedNegativeZeroDividend(a, b, c)
{
    var temp = a * b;
    return (temp % c) | 0;
}
noInline(moduloWithUnusedNegativeZeroDividend);

for (var i = 1; i < 1e4; ++i) {
    var result = moduloWithUnusedNegativeZeroDividend(i, 5, 5);
    if (result !== 0)
        throw "moduloWithUnusedNegativeZeroDividend(i, 5, 5), returned: " + result;
}

// Produce negative zero in the multiplication.
for (var i = 1; i < 1e4; ++i) {
    var result = moduloWithUnusedNegativeZeroDividend(-i, 0, 2);
    if (!(result === 0 && (1/result) === Infinity))
        throw "moduloWithUnusedNegativeZeroDividend(-i, 0, 2) failed, returned: " + result;
}

for (var i = 1; i < 1e4; ++i) {
    var result = moduloWithUnusedNegativeZeroDividend(-i, 0, Infinity);
    if (!(result === 0 && (1/result) === Infinity))
        throw "moduloWithUnusedNegativeZeroDividend(-i, 0, Infinity) failed, returned: " + result;

    var result = moduloWithUnusedNegativeZeroDividend(-i, 0, -Infinity);
    if (!(result === 0 && (1/result) === Infinity))
        throw "moduloWithUnusedNegativeZeroDividend(-i, 0, -Infinity) failed, returned: " + result;

    var result = moduloWithUnusedNegativeZeroDividend(-i, 0, NaN);
    if (result !== 0)
        throw "moduloWithUnusedNegativeZeroDividend(-i, 0, NaN) failed, returned: " + result;
}


// The sign of the divisor is completely irrelevant. This should never fail on negative zero divisors.
function moduloWithNegativeZeroDivisor(a, b, c)
{
    var temp = a * b;
    return c % temp;
}
noInline(moduloWithNegativeZeroDivisor);

// Warm up with integers.
for (var i = 1; i < 1e4; ++i) {
    var result = moduloWithNegativeZeroDivisor(i, 2, i);
    if (result !== i)
        throw "moduloWithNegativeZeroDividend(i, 2, i), returned: " + result;

    var result = moduloWithNegativeZeroDivisor(-i, 2, i);
    if (result !== i)
        throw "moduloWithNegativeZeroDividend(-i, 2, i), returned: " + result;
}

// Produce negative zero in the multiplication.
for (var i = 1; i < 1e4; ++i) {
    var result = moduloWithNegativeZeroDivisor(-i, 0, 2);
    if (result === result)
        throw "moduloWithNegativeZeroDivisor(-i, 0, 2) failed, returned: " + result;
}