Add test case for typed arrays slicing

test/mjsunit/typed-array-slice.js

Index: test/mjsunit/typed-array-slice.js
diff --git a/test/mjsunit/compiler/regress-loadfield.js b/test/mjsunit/typed-array-slice.js
similarity index 63%
copy from test/mjsunit/compiler/regress-loadfield.js
copy to test/mjsunit/typed-array-slice.js
index a3da156e3b9ac3363ce6620541b108fc2ff5083d..15b23ffd3084081187e07a327c442e51fa2071d5 100644
--- a/test/mjsunit/compiler/regress-loadfield.js
+++ b/test/mjsunit/typed-array-slice.js
@@ -27,43 +27,34 @@
 
 // Flags: --allow-natives-syntax
 
-// Regression test for GVN on field loads.
+// This is a regression test for overlapping key and value registers.
 
-function bar() {}
+types = [Array, Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array,
+         Uint32Array, Uint8ClampedArray, Float32Array, Float64Array];
 
-// Make sure there is a transition on adding "bar" inobject property.
-var b = new bar();
-b.bar = "bar";
+results1 = [-2, -2, 254, -2, 65534, -2, 4294967294, 0, -2, -2];
+results2 = [undefined, -1, 255, -1, 65535, -1, 4294967295, 0, -1, -1];
+results3 = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
+results4 = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1];

[rossberg, 2012/07/02 10:40:21]

Could you declare all the above variables with 'var'?

 
-function test(a) {
-  var b = new Array(10);
-  for (var i = 0; i < 10; i++) {
-    b[i] = new bar();
-  }
+const kElementCount = 40;
 
-  for (var i = 0; i < 10; i++) {
-    b[i].bar = a.foo;
-  }
+function do_slice(a) {
+  return Array.prototype.slice.call(a, 4, 8);
 }
 
-// Create an object with fast backing store properties.
-var a = {};
-a.p1 = "";
-a.p2 = "";
-a.p3 = "";
-a.p4 = "";
-a.p5 = "";
-a.p6 = "";
-a.p7 = "";
-a.p8 = "";
-a.p9 = "";
-a.p10 = "";
-a.p11 = "";
-a.foo = "foo";
-for (var i = 0; i < 5; i++) {
- test(a);
+for (var t = 0; t < types.length; t++) {
+  var type = types[t];
+  var a = new type(kElementCount);
+  for (i = 0; i < kElementCount; ++i ) {

[rossberg, 2012/07/02 10:40:21]

This could take a 'var', too.

+    a[i] = i-6;
+  }
+  delete a[5];
+  var sliced = do_slice(a);
+  
+  %ClearFunctionTypeFeedback(do_slice);
+  assertEquals(results1[t], sliced[0]);
+  assertEquals(results2[t], sliced[1]);
+  assertEquals(results3[t], sliced[2]);
+  assertEquals(results4[t], sliced[3]);
 }
-%OptimizeFunctionOnNextCall(test);
-test(a);
-
-test("");