1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/warp/phi-specialization.js b/js/src/jit-test/tests/warp/phi-specialization.js
new file mode 100644
index 0000000000..a466a9eb9b
--- /dev/null
+++ b/js/src/jit-test/tests/warp/phi-specialization.js
@@ -0,0 +1,42 @@
+// |jit-test| --fast-warmup
+
+var sum = 0;
+
+function foo(copy, shouldThrow) {
+  switch (copy) {
+   case 0:
+    var x = 0;
+    try {
+      if (shouldThrow) { throw 0;}
+      x = 1;
+    } catch {
+      x = "a";
+    }
+    // We create a specialized phi for x here, which bails out.
+    for (var i = 0; i < 100; i++) {
+      sum += x;
+    }
+    break;
+   case 1:
+    var y = 0;
+    try {
+      if (shouldThrow) { throw 0;}
+      y = 1;
+    } catch {
+      y = "a";
+    }
+    // We do not create a specialized phi the second time.
+    for (var i = 0; i < 100; i++) {
+      sum += y;
+    }
+    break;
+  }
+}
+
+with ({}) {}
+for (var i = 0; i < 2; i++) {
+  for (var j = 0; j < 50; j++) {
+    foo(i, false);
+  }
+  foo(i, true);
+}