Add Float32x4List.fromList to runtime implementation and some tests

tests/lib/typed_data/float32x4_cross_test.dart

Index: tests/lib/typed_data/float32x4_cross_test.dart
diff --git a/tests/lib/typed_data/float32x4_cross_test.dart b/tests/lib/typed_data/float32x4_cross_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0816846ce062e9324d8826eae796c949726ba54a
--- /dev/null
+++ b/tests/lib/typed_data/float32x4_cross_test.dart
@@ -0,0 +1,50 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// VMOptions=--optimization-counter-threshold=10
+
+// Library tag to be able to run in html test framework.
+library float32x4_cross_test;
+
+import 'dart:typed_data';
+import 'package:expect/expect.dart';
+
+Float32x4 cross(Float32x4 a, Float32x4 b) {
+  var t0 = a.yzxw;
+  var t1 = b.zxyw;
+  var l = t0 * t1;
+  t0 = a.zxyw;
+  t1 = b.yzxw;
+  var r = t0 * t1;
+  return l-r;
+}
+
+void testCross(Float32x4 a, Float32x4 b, Float32x4 r) {
+  var x = cross(a, b);
+  Expect.equals(r.x, x.x);
+  Expect.equals(r.y, x.y);
+  Expect.equals(r.z, x.z);
+  Expect.equals(r.w, x.w);
+}
+
+main() {
+  var x = new Float32x4(1.0, 0.0, 0.0, 0.0);
+  var y = new Float32x4(0.0, 1.0, 0.0, 0.0);
+  var z = new Float32x4(0.0, 0.0, 1.0, 0.0);
+  var zero = new Float32x4.zero();
+
+  for (int i = 0; i < 20; i++) {
+    testCross(x, y, z);
+    testCross(z, x, y);
+    testCross(y, z, x);
+    testCross(z, y, -x);
+    testCross(x, z, -y);
+    testCross(y, x, -z);
+    testCross(x, x, zero);
+    testCross(y, y, zero);
+    testCross(z, z, zero);
+    testCross(x, y, cross(-y, x));
+    testCross(x, y+z, cross(x, y) + cross(x, z));
+  }
+}
+