Add new Float32x4 type for SIMD.js.

src/factory.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 #include "src/messages.h"
 
@@ skipping 334 matching lines @@
                                    PretenureFlag pretenure = NOT_TENURED) {
     if (Smi::IsValid(static_cast<intptr_t>(value))) {
       return Handle<Object>(Smi::FromIntptr(static_cast<intptr_t>(value)),
                             isolate());
     }
     return NewNumber(static_cast<double>(value), pretenure);
   }
   Handle<HeapNumber> NewHeapNumber(double value,
                                    MutableMode mode = IMMUTABLE,
                                    PretenureFlag pretenure = NOT_TENURED);
+  Handle<Float32x4> NewFloat32x4(double w, double x, double y, double z,

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

Should we use float here to force the rounding into the caller?

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

Yes, much better.

+                                 PretenureFlag pretenure = NOT_TENURED);
 
   // These objects are used by the api to create env-independent data
   // structures in the heap.
   inline Handle<JSObject> NewNeanderObject() {
     return NewJSObjectFromMap(neander_map());
   }
 
   Handle<JSWeakMap> NewJSWeakMap();
 
   Handle<JSObject> NewArgumentsObject(Handle<JSFunction> callee, int length);
@@ skipping 376 matching lines @@
   // Reinitialize a JSProxy into an (empty) JS object of respective type and
   // size, but keeping the original prototype.  The receiver must have at least
   // the size of the new object.  The object is reinitialized and behaves as an
   // object that has been freshly allocated.
   void ReinitializeJSProxy(Handle<JSProxy> proxy, InstanceType type, int size);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_