1 files changed, 93 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/cacheir/compare-null-or-undef.js b/js/src/jit-test/tests/cacheir/compare-null-or-undef.js
new file mode 100644
index 0000000000..b39eefd957
--- /dev/null
+++ b/js/src/jit-test/tests/cacheir/compare-null-or-undef.js
@@ -0,0 +1,93 @@
+// Test relational comparison when one operand is null or undefined.
+
+function test(xs) {
+  for (let i = 0; i < 200; ++i) {
+    let x = xs[i % xs.length];
+
+    // The result is equal when compared to the result with explicit ToNumber conversions.
+
+    // Test when null-or-undefined is on the right-hand side.
+    assertEq(x < nullOrUndef, (+x) < (+nullOrUndef));
+    assertEq(x <= nullOrUndef, (+x) <= (+nullOrUndef));
+    assertEq(x >= nullOrUndef, (+x) >= (+nullOrUndef));
+    assertEq(x > nullOrUndef, (+x) > (+nullOrUndef));
+
+    // Test when null-or-undefined is on the left-hand side.
+    assertEq(nullOrUndef < x, (+nullOrUndef) < (+x));
+    assertEq(nullOrUndef <= x, (+nullOrUndef) <= (+x));
+    assertEq(nullOrUndef >= x, (+nullOrUndef) >= (+x));
+    assertEq(nullOrUndef > x, (+nullOrUndef) > (+x));
+  }
+}
+
+function runTest(inputs) {
+  let fNull = Function(`return ${test}`.replaceAll("nullOrUndef", "null"))();
+  fNull(inputs);
+
+  let fUndefined = Function(`return ${test}`.replaceAll("nullOrUndef", "undefined"))();
+  fUndefined(inputs);
+}
+
+// Null inputs.
+runTest([
+  null,
+]);
+
+// Undefined inputs.
+runTest([
+  undefined,
+]);
+
+// Null or undefined inputs.
+runTest([
+  null,
+  undefined,
+]);
+
+// Int32 inputs
+runTest([
+  -0x8000_0000,
+  -0x7fff_ffff,
+  -0x7fff_fffe,
+  -2,
+  -1,
+  0,
+  1,
+  2,
+  0x7fff_fffe,
+  0x7fff_ffff,
+]);
+
+// Number inputs
+runTest([
+  Number.NEGATIVE_INFINITY,
+  -Number.MAX_VALUE,
+  Number.MIN_SAFE_INTEGER,
+  -1.5,
+  -0.5,
+  -Number.EPSILON,
+  -Number.MIN_VALUE,
+  -0,
+  0,
+  Number.MIN_VALUE,
+  Number.EPSILON,
+  0.5,
+  1.5,
+  Number.MAX_SAFE_INTEGER,
+  Number.MAX_VALUE,
+  Number.POSITIVE_INFINITY,
+  NaN,
+]);
+
+// Boolean inputs.
+runTest([
+  true, false,
+]);
+
+// String inputs
+runTest([
+  "",
+  "0", "-0", "0.0", "0e100",
+  "1", "1.5", "-1234", "-1e0",
+  "Infinity", "NaN", "not-a-number",
+]);