1 files changed, 258 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/bigint-compare-int32.js b/js/src/jit-test/tests/cacheir/bigint-compare-int32.js
new file mode 100644
index 0000000000..16f6a31ad0
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/bigint-compare-int32.js
@@ -0,0 +1,258 @@
+// Extensive test for (BigInt R Int32) comparison operations, testing the output
+// is correct and consistent with (Int32 R⁻¹ BigInt).
+
+function gcd(a, b) {
+  a |= 0;
+  b |= 0;
+  while (b !== 0) {
+    [a, b] = [b, a % b];
+  }
+  return Math.abs(a);
+}
+
+const ITERATIONS = 150;
+
+function assertAllCombinationsTested(xs, ys, n) {
+  // If the array lengths are relatively prime and their product is at least
+  // |n| long, all possible combinations are tested at least once. Make sure
+  // we test each combination at least three times.
+  var m = 3;
+
+  assertEq(gcd(xs.length, ys.length), 1);
+  assertEq(m * xs.length * ys.length <= n, true);
+}
+
+function LessThan(xs, ys, n = ITERATIONS) {
+  assertAllCombinationsTested(xs, ys, n);
+  for (var i = 0; i < n; ++i) {
+    var x = xs[i % xs.length];
+    var y = ys[i % ys.length]|0; // Ensure int32 typed
+
+    assertEq(x == y, false);
+    assertEq(y == x, false);
+
+    assertEq(x != y, true);
+    assertEq(y != x, true);
+
+    assertEq(x < y, true);
+    assertEq(y < x, false);
+
+    assertEq(x <= y, true);
+    assertEq(y <= x, false);
+
+    assertEq(x > y, false);
+    assertEq(y > x, true);
+
+    assertEq(x >= y, false);
+    assertEq(y >= x, true);
+  }
+}
+
+function GreaterThan(xs, ys, n = ITERATIONS) {
+  assertAllCombinationsTested(xs, ys, n);
+  for (var i = 0; i < n; ++i) {
+    var x = xs[i % xs.length];
+    var y = ys[i % ys.length]|0; // Ensure int32 typed
+
+    assertEq(x == y, false);
+    assertEq(y == x, false);
+
+    assertEq(x != y, true);
+    assertEq(y != x, true);
+
+    assertEq(x < y, false);
+    assertEq(y < x, true);
+
+    assertEq(x <= y, false);
+    assertEq(y <= x, true);
+
+    assertEq(x > y, true);
+    assertEq(y > x, false);
+
+    assertEq(x >= y, true);
+    assertEq(y >= x, false);
+  }
+}
+
+function Equal(xs, ys, n = ITERATIONS) {
+  assertAllCombinationsTested(xs, ys, n);
+  for (var i = 0; i < n; ++i) {
+    var x = xs[i % xs.length];
+    var y = ys[i % ys.length]|0; // Ensure int32 typed
+
+    assertEq(x == y, true);
+    assertEq(y == x, true);
+
+    assertEq(x != y, false);
+    assertEq(y != x, false);
+
+    assertEq(x < y, false);
+    assertEq(y < x, false);
+
+    assertEq(x <= y, true);
+    assertEq(y <= x, true);
+
+    assertEq(x > y, false);
+    assertEq(y > x, false);
+
+    assertEq(x >= y, true);
+    assertEq(y >= x, true);
+  }
+}
+
+function test(fn) {
+  // Clone the test function to ensure a new function is compiled each time.
+  return Function(`return ${fn}`)();
+}
+
+const negativeInt32 = [-2147483648, -2147483647, -1];
+const zeroInt32 = [0];
+const positiveInt32 = [1, 2147483646, 2147483647];
+const zeroOrPositiveInt32 = [...zeroInt32, ...positiveInt32];
+const anyInt32 = [...negativeInt32, ...zeroInt32, ...positiveInt32];
+
+// Test when the BigInt is too large to be representable as a single BigInt digit.
+function testLarge() {
+  var xs = [
+    2n ** 32n, // exceeds single digit limit on 32-bit
+    2n ** 64n, // exceeds single digit limit on 64-bit
+    2n ** 96n, // not a single digit on either platform
+  ];
+  test(GreaterThan)(xs, anyInt32);
+
+  var xs = [
+    -(2n ** 32n), // exceeds single digit limit on 32-bit
+    -(2n ** 64n), // exceeds single digit limit on 64-bit
+    -(2n ** 96n), // not a single digit on either platform
+  ];
+  test(LessThan)(xs, anyInt32);
+}
+testLarge();
+
+// Test when the BigInt is 0n.
+function testZero() {
+  var xs = [
+    0n
+  ];
+
+  test(GreaterThan)(xs, negativeInt32);
+  test(Equal)(xs, zeroInt32);
+  test(LessThan)(xs, positiveInt32);
+}
+testZero();
+
+// Test when both numbers are negative.
+function testNegative() {
+  var xs = [
+    -(2n ** 64n) - 2n,
+    -(2n ** 64n) - 1n, // Max negative using a single BigInt digit on 64-bit.
+    -(2n ** 64n),
+
+    -(2n ** 32n) - 2n,
+    -(2n ** 32n) - 1n, // Max negative using a single BigInt digit on 32-bit.
+    -(2n ** 32n),
+
+    -(2n ** 31n) - 1n, // One past max negative for Int32.
+  ];
+  test(LessThan)(xs, negativeInt32);
+
+  var xs = [
+    -(2n ** 31n), // Max negative for Int32.
+  ];
+  test(Equal)(xs, [-2147483648]);
+  test(LessThan)(xs, [-2147483647, -1]);
+
+  var xs = [
+    -(2n ** 31n) + 1n,
+  ];
+  test(GreaterThan)(xs, [-2147483648]);
+  test(Equal)(xs, [-2147483647]);
+  test(LessThan)(xs, [-1]);
+
+  var xs = [
+    -1n,
+  ];
+  test(GreaterThan)(xs, [-2147483648, -2147483647]);
+  test(Equal)(xs, [-1]);
+}
+testNegative();
+
+// Test when both numbers are positive (and BigInt strictly positive).
+function testPositive() {
+  var xs = [
+    1n,
+  ];
+  test(GreaterThan)(xs, [0]);
+  test(Equal)(xs, [1]);
+  test(LessThan)(xs, [2147483646, 2147483647]);
+
+  var xs = [
+    2n ** 31n - 2n,
+  ];
+  test(GreaterThan)(xs, [0, 1]);
+  test(Equal)(xs, [2147483646]);
+  test(LessThan)(xs, [2147483647]);
+
+  var xs = [
+    2n ** 31n - 1n, // Max positive for Int32.
+  ];
+  test(GreaterThan)(xs, [0, 1, 2147483646]);
+  test(Equal)(xs, [2147483647]);
+
+  var xs = [
+    2n ** 31n, // One past max positive for Int32.
+
+    2n ** 32n - 2n,
+    2n ** 32n - 1n, // Max positive using a single BigInt digit on 32-bit.
+    2n ** 32n,
+
+    2n ** 64n - 2n,
+    2n ** 64n - 1n, // Max positive using a single BigInt digit on 64-bit.
+    2n ** 64n,
+  ];
+  test(GreaterThan)(xs, zeroOrPositiveInt32);
+}
+testPositive();
+
+// Test negative BigInt and positive Int32.
+function testNegativePositive() {
+  var xs = [
+    -(2n ** 64n) - 2n,
+    -(2n ** 64n) - 1n, // Max negative using a single BigInt digit on 64-bit.
+    -(2n ** 64n),
+
+    -(2n ** 32n) - 2n,
+    -(2n ** 32n) - 1n, // Max negative using a single BigInt digit on 32-bit.
+    -(2n ** 32n),
+
+    -(2n ** 31n) - 1n,
+    -(2n ** 31n), // Max negative for Int32.
+    -(2n ** 31n) + 1n,
+
+    -2n, // Extra entry to ensure assertAllCombinationsTested passes.
+    -1n,
+  ];
+  test(LessThan)(xs, zeroOrPositiveInt32);
+}
+testNegativePositive();
+
+// Test (strictly) positive BigInt and negative Int32.
+function testPositiveNegative() {
+  var xs = [
+    1n,
+
+    2n ** 31n - 2n,
+    2n ** 31n - 1n, // Max positive for Int32.
+    2n ** 31n,
+
+    2n ** 32n - 2n,
+    2n ** 32n - 1n, // Max positive using a single BigInt digit on 32-bit.
+    2n ** 32n,
+
+    2n ** 64n - 2n,
+    2n ** 64n - 1n, // Max positive using a single BigInt digit on 64-bit.
+    2n ** 64n,
+  ];
+  test(GreaterThan)(xs, negativeInt32);
+}
+testPositiveNegative();