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diff --git a/js/src/jit-test/tests/cacheir/bigint-compare-double.js b/js/src/jit-test/tests/cacheir/bigint-compare-double.js
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+// Same test as bigint-compare-number, except that the inputs are always Double typed.
+
+// Test various combinations of (BigInt R Double) and ensures the result is consistent with
+// (Double R⁻¹ BigInt). This test doesn't aim to cover the overall correctness of (BigInt R Double),
+// but merely ensures the possible combinations are properly handled in CacheIR.
+
+var xs = [
+  // Definitely heap digits.
+  -(2n ** 2000n),
+  -(2n ** 1000n),
+
+  // -(2n**64n)
+  -18446744073709551617n,
+  -18446744073709551616n,
+  -18446744073709551615n,
+
+  // -(2n**63n)
+  -9223372036854775809n,
+  -9223372036854775808n,
+  -9223372036854775807n,
+
+  // -(2**32)
+  -4294967297n,
+  -4294967296n,
+  -4294967295n,
+
+  // -(2**31)
+  -2147483649n,
+  -2147483648n,
+  -2147483647n,
+
+  -1n,
+  0n,
+  1n,
+
+  // 2**31
+  2147483647n,
+  2147483648n,
+  2147483649n,
+
+  // 2**32
+  4294967295n,
+  4294967296n,
+  4294967297n,
+
+  // 2n**63n
+  9223372036854775807n,
+  9223372036854775808n,
+  9223372036854775809n,
+
+  // 2n**64n
+  18446744073709551615n,
+  18446744073709551616n,
+  18446744073709551617n,
+
+  // Definitely heap digits.
+  2n ** 1000n,
+  2n ** 2000n,
+];
+
+function Double(x) {
+  // numberToDouble always returns a Double valued number.
+  return numberToDouble(x);
+}
+
+// Compute the Double approximation of the BigInt values.
+var ys = xs.map(x => Double(Number(x)));
+
+// Compute if the Double approximation of the BigInt values is exact.
+// (The larger test values are all powers of two, so we can keep this function simple.)
+var zs = xs.map(x => {
+  var isNegative = x < 0n;
+  if (isNegative) {
+    x = -x;
+  }
+  var s = x.toString(2);
+  if (s.length <= 53 || (s.length <= 1024 && /^1+0+$/.test(s))) {
+    return 0;
+  }
+  if (s.length <= 1024 && /^1+$/.test(s)) {
+    return isNegative ? -1 : 1;
+  }
+  if (s.length <= 1024 && /^1+0+1$/.test(s)) {
+    return isNegative ? 1 : -1;
+  }
+  return NaN;
+});
+
+function testLooseEqual() {
+  for (var i = 0; i < 100; ++i) {
+    var j = i % xs.length;
+    var x = xs[j];
+    var y = ys[j];
+    var z = zs[j];
+
+    assertEq(x == y, z === 0);
+    assertEq(y == x, z === 0);
+  }
+}
+testLooseEqual();
+
+function testLooseNotEqual() {
+  for (var i = 0; i < 100; ++i) {
+    var j = i % xs.length;
+    var x = xs[j];
+    var y = ys[j];
+    var z = zs[j];
+
+    assertEq(x != y, z !== 0);
+    assertEq(y != x, z !== 0);
+  }
+}
+testLooseNotEqual();
+
+function testLessThan() {
+  for (var i = 0; i < 100; ++i) {
+    var j = i % xs.length;
+    var x = xs[j];
+    var y = ys[j];
+    var z = zs[j];
+
+    if (z === 0) {
+      assertEq(x < y, false);
+      assertEq(y < x, false);
+    } else if (z > 0) {
+      assertEq(x < y, true);
+      assertEq(y < x, false);
+    } else if (z < 0) {
+      assertEq(x < y, false);
+      assertEq(y < x, true);
+    } else {
+      assertEq(x < y, y > 0);
+      assertEq(y < x, y < 0);
+    }
+  }
+}
+testLessThan();
+
+function testLessThanEquals() {
+  for (var i = 0; i < 100; ++i) {
+    var j = i % xs.length;
+    var x = xs[j];
+    var y = ys[j];
+    var z = zs[j];
+
+    if (z === 0) {
+      assertEq(x <= y, true);
+      assertEq(y <= x, true);
+    } else if (z > 0) {
+      assertEq(x <= y, true);
+      assertEq(y <= x, false);
+    } else if (z < 0) {
+      assertEq(x <= y, false);
+      assertEq(y <= x, true);
+    } else {
+      assertEq(x <= y, y > 0);
+      assertEq(y <= x, y < 0);
+    }
+  }
+}
+testLessThanEquals();
+
+function testGreaterThan() {
+  for (var i = 0; i < 100; ++i) {
+    var j = i % xs.length;
+    var x = xs[j];
+    var y = ys[j];
+    var z = zs[j];
+
+    if (z === 0) {
+      assertEq(x > y, false);
+      assertEq(y > x, false);
+    } else if (z > 0) {
+      assertEq(x > y, false);
+      assertEq(y > x, true);
+    } else if (z < 0) {
+      assertEq(x > y, true);
+      assertEq(y > x, false);
+    } else {
+      assertEq(x > y, y < 0);
+      assertEq(y > x, y > 0);
+    }
+  }
+}
+testGreaterThan();
+
+function testGreaterThanEquals() {
+  for (var i = 0; i < 100; ++i) {
+    var j = i % xs.length;
+    var x = xs[j];
+    var y = ys[j];
+    var z = zs[j];
+
+    if (z === 0) {
+      assertEq(x >= y, true);
+      assertEq(y >= x, true);
+    } else if (z > 0) {
+      assertEq(x >= y, false);
+      assertEq(y >= x, true);
+    } else if (z < 0) {
+      assertEq(x >= y, true);
+      assertEq(y >= x, false);
+    } else {
+      assertEq(x >= y, y < 0);
+      assertEq(y >= x, y > 0);
+    }
+  }
+}
+testGreaterThanEquals();