Add Load2/store2 to Sk4x (dumb impl for now)

patch from issue 1001003002 at patchset 1 (http://crrev.com/1001003002#ps1)

BUG=skia:

Review URL: https://codereview.chromium.org/1001453006

1 files changed, 12 insertions, 0 deletions

diff --git a/src/core/Sk4x.h b/src/core/Sk4x.h
index 0b9796db9b..401bbd857b 100644
--- a/src/core/Sk4x.h
+++ b/src/core/Sk4x.h
@@ -37,6 +37,18 @@ public:
     void store       (T[4]) const;
     void storeAligned(T[4]) const;
 
+    // Experimental!
+    static Sk4x Load2(const T src[2]) {
+        const T padded[4] = { src[0], src[1], 0, 0 };
+        return Load(padded);
+    }
+    void store2(T dst[2]) const {
+        T padded[4];
+        this->store(padded);
+        dst[0] = padded[0];
+        dst[1] = padded[1];
+    }
+
     template <typename Dst> Dst reinterpret() const;
     template <typename Dst> Dst        cast() const;