diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/testBug762105.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/testBug762105.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+function escapeme() {}
+
+function f1(x) {
+    escapeme(arguments);
+    var y = ++x;
+    return x + y;
+}
+for (var i = 0; i < 100; ++i)
+    assertEq(f1(2), 6);
+
+function f2(x) {
+    escapeme(arguments);
+    var y = --x;
+    return x + y;
+}
+for (var i = 0; i < 100; ++i)
+    assertEq(f2(2), 2);
+
+function f3(x) {
+    escapeme(arguments);
+    var y = x++;
+    return x + y;
+}
+for (var i = 0; i < 100; ++i)
+    assertEq(f3(2), 5);
+
+function f4(x) {
+    escapeme(arguments);
+    var y = x--;
+    return x + y;
+}
+for (var i = 0; i < 100; ++i)
+    assertEq(f4(2), 3);