Add new Float32x4 type for SIMD.js.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 38968ad0b33b026b2a6087a908044a9026d8c009..08eaf20308fbe815966fc8448ad174f00d7ea273 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -2742,6 +2742,7 @@ bool Heap::CreateInitialMaps() {
     ALLOCATE_MAP(HEAP_NUMBER_TYPE, HeapNumber::kSize, heap_number)
     ALLOCATE_MAP(MUTABLE_HEAP_NUMBER_TYPE, HeapNumber::kSize,
                  mutable_heap_number)
+    ALLOCATE_MAP(FLOAT32X4_TYPE, Float32x4::kSize, float32x4)
     ALLOCATE_MAP(SYMBOL_TYPE, Symbol::kSize, symbol)
     ALLOCATE_MAP(FOREIGN_TYPE, Foreign::kSize, foreign)
 
@@ -2891,6 +2892,32 @@ AllocationResult Heap::AllocateHeapNumber(double value, MutableMode mode,
 }
 
 
+AllocationResult Heap::AllocateFloat32x4(float w, float x, float y, float z,
+                                         PretenureFlag pretenure) {
+  // Statically ensure that it is safe to allocate SIMD values in paged
+  // spaces.
+  int size = Float32x4::kSize;
+  STATIC_ASSERT(Float32x4::kSize <= Page::kMaxRegularHeapObjectSize);
+
+  AllocationSpace space = SelectSpace(size, pretenure);
+
+  HeapObject* result;
+  {
+    AllocationResult allocation =
+        AllocateRaw(size, space, OLD_SPACE, kSimd128Unaligned);
+    if (!allocation.To(&result)) return allocation;
+  }
+
+  result->set_map_no_write_barrier(float32x4_map());
+  Float32x4* float32x4 = Float32x4::cast(result);
+  float32x4->set_lane(0, w);
+  float32x4->set_lane(1, x);
+  float32x4->set_lane(2, y);
+  float32x4->set_lane(3, z);
+  return result;
+}
+
+
 AllocationResult Heap::AllocateCell(Object* value) {
   int size = Cell::kSize;
   STATIC_ASSERT(Cell::kSize <= Page::kMaxRegularHeapObjectSize);