Add new Float32x4 type for SIMD.js.

test/cctest/test-heap.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
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@@ skipping 41 matching lines @@
   CHECK_EQ(type, map->instance_type());
   CHECK_EQ(instance_size, map->instance_size());
 }
 
 
 TEST(HeapMaps) {
   CcTest::InitializeVM();
   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);
 }
 
 
 static void CheckOddball(Isolate* isolate, Object* obj, const char* string) {
   CHECK(obj->IsOddball());
   Handle<Object> handle(obj, isolate);
   Object* print_string =
       *Execution::ToString(isolate, handle).ToHandleChecked();
@@ skipping 104 matching lines @@
   CHECK(value->IsNumber());
   CHECK_EQ(static_cast<double>(static_cast<uint32_t>(Smi::kMaxValue) + 1),
            value->Number());
 
   value = factory->NewNumberFromUint(static_cast<uint32_t>(1) << 31);
   CHECK(value->IsHeapNumber());
   CHECK(value->IsNumber());
   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()));
 
   Handle<String> s = factory->NewStringFromStaticChars("fisk hest ");
   CHECK(s->IsString());
   CHECK_EQ(10, s->length());
 
   Handle<String> object_string = Handle<String>::cast(factory->Object_string());
   Handle<GlobalObject> global(CcTest::i_isolate()->context()->global_object());
@@ skipping 5702 matching lines @@
   size_t counter2 = 2000;
   tracer->SampleAllocation(time2, counter2, counter2);
   size_t throughput = tracer->AllocationThroughputInBytesPerMillisecond(100);
   CHECK_EQ(2 * (counter2 - counter1) / (time2 - time1), throughput);
   int time3 = 1000;
   size_t counter3 = 30000;
   tracer->SampleAllocation(time3, counter3, counter3);
   throughput = tracer->AllocationThroughputInBytesPerMillisecond(100);
   CHECK_EQ(2 * (counter3 - counter1) / (time3 - time1), throughput);
 }