Add new Float32x4 type for SIMD.js.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 4a4b896381066414008ebf673f2672a0abcdd00e..cf42552e28539177f26d372393341847f4089607 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -170,6 +170,7 @@ bool Object::IsHeapObject() const {
 
 TYPE_CHECKER(HeapNumber, HEAP_NUMBER_TYPE)
 TYPE_CHECKER(MutableHeapNumber, MUTABLE_HEAP_NUMBER_TYPE)
+TYPE_CHECKER(Float32x4, FLOAT32X4_TYPE)
 TYPE_CHECKER(Symbol, SYMBOL_TYPE)
 
 
@@ -1320,6 +1321,12 @@ MaybeHandle<Object> JSProxy::SetElementWithHandler(Handle<JSProxy> proxy,
 #define WRITE_INT32_FIELD(p, offset, value) \
   (*reinterpret_cast<int32_t*>(FIELD_ADDR(p, offset)) = value)
 
+#define READ_FLOAT_FIELD(p, offset) \
+  (*reinterpret_cast<const float*>(FIELD_ADDR_CONST(p, offset)))
+
+#define WRITE_FLOAT_FIELD(p, offset, value) \
+  (*reinterpret_cast<float*>(FIELD_ADDR(p, offset)) = value)
+
 #define READ_UINT64_FIELD(p, offset) \
   (*reinterpret_cast<const uint64_t*>(FIELD_ADDR_CONST(p, offset)))
 
@@ -1576,6 +1583,18 @@ int HeapNumber::get_sign() {
 }
 
 
+double Float32x4::get_lane(int lane) const {
+  DCHECK(lane < 4 && lane >= 0);

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

Looks like we are only supporting little endian for now. I suppose that's OK.

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

I guess there aren't any big-endian media instruction sets? However, it's easy
enough to support here. Done.

+  return READ_FLOAT_FIELD(this, kValueOffset + lane * 4);
+}
+
+
+void Float32x4::set_lane(int lane, double value) {
+  DCHECK(lane < 4 && lane >= 0);
+  WRITE_FLOAT_FIELD(this, kValueOffset + lane * 4, DoubleToFloat32(value));
+}
+
+
 ACCESSORS(JSObject, properties, FixedArray, kPropertiesOffset)
 
 
@@ -2433,6 +2452,7 @@ AllocationAlignment HeapObject::RequiredAlignment() {
     return kDoubleAligned;
   }
   if (IsHeapNumber()) return kDoubleUnaligned;
+  if (IsFloat32x4()) return kSimd128Unaligned;
 #endif  // V8_HOST_ARCH_32_BIT
   return kWordAligned;
 }
@@ -2973,6 +2993,7 @@ CAST_ACCESSOR(FixedArray)
 CAST_ACCESSOR(FixedArrayBase)
 CAST_ACCESSOR(FixedDoubleArray)
 CAST_ACCESSOR(FixedTypedArrayBase)
+CAST_ACCESSOR(Float32x4)
 CAST_ACCESSOR(Foreign)
 CAST_ACCESSOR(GlobalDictionary)
 CAST_ACCESSOR(GlobalObject)