Specialize Sk2d for SSE2

src/core/SkNx.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkNx_DEFINED
 #define SkNx_DEFINED
 
@@ skipping 185 matching lines @@
 //   Sk4i is = SkNx_cast<int>(fs);     // Cast each float to int.
 // This can be specialized in ../opts/SkNx_foo.h if there's a better platform-specific cast.
 template <typename D, typename S, int N>
 SkNx<N,D> SkNx_cast(const SkNx<N,S>& src) {
     return SkNx_cast_fallback<D,S,N>(src, MakeSkIntSequence<N>());
 }
 
 }  // namespace
 
 typedef SkNx<2, float> Sk2f;
-typedef SkNx<2, float> Sk2s;
 typedef SkNx<4, float> Sk4f;
-typedef SkNx<4, float> Sk4s;
 typedef SkNx<8, float> Sk8f;
-typedef SkNx<8, float> Sk8s;
+
+typedef SkNx<2, double> Sk2d;
+typedef SkNx<4, double> Sk4d;
+typedef SkNx<8, double> Sk8d;
+
+typedef SkNx<2, SkScalar> Sk2s;
+typedef SkNx<4, SkScalar> Sk4s;
+typedef SkNx<8, SkScalar> Sk8s;
 
 typedef SkNx< 4, uint16_t> Sk4h;
 typedef SkNx< 8, uint16_t> Sk8h;
 typedef SkNx<16, uint16_t> Sk16h;
 
 typedef SkNx< 4, uint8_t>  Sk4b;
 typedef SkNx< 8, uint8_t>  Sk8b;
 typedef SkNx<16, uint8_t>  Sk16b;
 
 typedef SkNx<4, int> Sk4i;
@@ skipping 12 matching lines @@
         SkNx_cast<uint8_t>(b).store(p+ 4);
         SkNx_cast<uint8_t>(c).store(p+ 8);
         SkNx_cast<uint8_t>(d).store(p+12);
     }
 #endif
 
 #undef REQUIRE
 
 
 #endif//SkNx_DEFINED