Add new Float32x4 type for SIMD.js.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index 9e3c80ec39b766ec35892dba25cbe134d2b21cc2..0a60964ee8eb044fec0d8a353cc7c3ebd3d6b9b5 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -59,6 +59,7 @@ TEST(HeapMaps) {
   Heap* heap = CcTest::heap();
   CheckMap(heap->meta_map(), MAP_TYPE, Map::kSize);
   CheckMap(heap->heap_number_map(), HEAP_NUMBER_TYPE, HeapNumber::kSize);
+  CheckMap(heap->float32x4_map(), FLOAT32X4_TYPE, Float32x4::kSize);
   CheckMap(heap->fixed_array_map(), FIXED_ARRAY_TYPE, kVariableSizeSentinel);
   CheckMap(heap->string_map(), STRING_TYPE, kVariableSizeSentinel);
 }
@@ -183,6 +184,17 @@ TEST(HeapObjects) {
   CHECK_EQ(static_cast<double>(static_cast<uint32_t>(1) << 31),
            value->Number());
 
+  value = factory->NewFloat32x4(1, 2, 3, 4);

[titzer, 2015/06/03 13:27:15]

Can we try some more floating point values, and also -0.0 and NaN values?

You can write your own method with lots of example values and exhaustive reading
and writing of the individual lanes.

[bbudge, 2015/06/03 20:31:48]

Done.

+  CHECK(value->IsFloat32x4());
+  CHECK(value->BooleanValue());  // SIMD values map to true.
+  Float32x4* float32x4 = *Handle<Float32x4>::cast(value);
+  CHECK_EQ(1, float32x4->get_lane(0));
+  CHECK_EQ(2, float32x4->get_lane(1));
+  CHECK_EQ(3, float32x4->get_lane(2));
+  CHECK_EQ(4, float32x4->get_lane(3));
+  float32x4->set_lane(3, 5);
+  CHECK_EQ(5, float32x4->get_lane(3));
+
   // nan oddball checks
   CHECK(factory->nan_value()->IsNumber());
   CHECK(std::isnan(factory->nan_value()->Number()));