Index: test/mjsunit/regress/regress-460917.js |
diff --git a/test/mjsunit/regress/regress-460917.js b/test/mjsunit/regress/regress-460917.js |
new file mode 100644 |
index 0000000000000000000000000000000000000000..68e1b6308821751ca7e62d4cdb73f63bad497051 |
--- /dev/null |
+++ b/test/mjsunit/regress/regress-460917.js |
@@ -0,0 +1,35 @@ |
+// Copyright 2015 the V8 project authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+// Flags: --allow-natives-syntax |
+ |
+function boom(a1, a2) { |
+ // Do something with a2 that needs a map check (for DOUBLE_ELEMENTS). |
+ var s = a2[0]; |
+ // Emit a load that transitions a1 to FAST_ELEMENTS. |
+ var t = a1[0]; |
+ // Emit a store to a2 that assumes DOUBLE_ELEMENTS. |
+ // The map check is considered redundant and will be eliminated. |
+ a2[0] = 0.3; |
+} |
+ |
+// Prepare type feedback for the "t = a1[0]" load: fast elements. |
+var fast_elem = new Array(1); |
+fast_elem[0] = "tagged"; |
+boom(fast_elem, [1]); |
+ |
+// Prepare type feedback for the "a2[0] = 0.3" store: double elements. |
+var double_elem = new Array(1); |
+double_elem[0] = 0.1; |
+boom(double_elem, double_elem); |
+ |
+// Reset |double_elem| and go have a party. |
+double_elem = new Array(10); |
+double_elem[0] = 0.1; |
+ |
+%OptimizeFunctionOnNextCall(boom); |
+boom(double_elem, double_elem); |
+ |
+assertEquals(0.3, double_elem[0]); |
+assertEquals(undefined, double_elem[1]); |