1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/basic/constant-folding-1.js b/js/src/jit-test/tests/basic/constant-folding-1.js
new file mode 100644
index 0000000000..5bcb73b130
--- /dev/null
+++ b/js/src/jit-test/tests/basic/constant-folding-1.js
@@ -0,0 +1,43 @@
+function bytecode(f) {
+    if (typeof disassemble !== "function")
+        return "unavailable";
+    var d = disassemble(f);
+    return d.slice(d.indexOf("main:"), d.indexOf("\n\n"));
+}
+assertEq(bytecode(() => "hello" + "world"),
+         bytecode(() => "helloworld"));
+assertEq(bytecode(() => 2 + "2" + "2"),
+         bytecode(() => "222"));
+assertEq(bytecode(() => "x" + "3"),
+         bytecode(() => "x3"));
+
+var s = "hoge";
+assertEq(bytecode(() => "fo" + "o" + s + "ba" + "r"),
+         bytecode(() => "foo" + s + "bar"));
+assertEq(bytecode(() => "fo" + "o" + 1 + s + 1 + "ba" + "r"),
+         bytecode(() => "foo1" + s + "1bar"));
+assertEq(bytecode(() => 1 + (2 * 2) + "x"),
+         bytecode(() => 5 + "x"));
+assertEq(s + 1 + 2, "hoge12");
+assertEq((() => s + 1 + 2)(), "hoge12");
+
+// SpiderMonkey knows that 1 + 1 == "11".
+assertEq(bytecode(() => "x" + s + 1 + 1),
+         bytecode(() => "x" + s + "11"));
+
+var n = 5;
+assertEq(1 + n + 1 + "ba" + "r", "7bar");
+assertEq(1 + 2 + {valueOf: () => 3, toString: () => 'x'} + 4 + 5,15);
+assertEq(1+2+n,8);
+assertEq(bytecode(() => 1 + 2 + n + 1 + 2),
+         bytecode(() => 3 + n + 1 + 2));
+assertEq(1 + 2 + n + 1 + 2, 11);
+assertEq(bytecode(() => 1 + 2 + s + 1 + 2),
+         bytecode(() => 3 + s + 1 + 2));
+assertEq(1 + 2 + s + 1 + 2, "3hoge12");
+
+assertEq(bytecode(() => ["a" + "b" + n]),
+         bytecode(() => ["ab" + n]));
+var a = ["a" + "b" + n];
+assertEq(a[0], "ab5");
+