Sk2x

This adds an API, an SSE impl, a portable impl, and some tests for Sk2f/Sk2d/Sk2s.

BUG=skia:

Review URL: https://codereview.chromium.org/1025463002

1 files changed, 72 insertions, 0 deletions

diff --git a/src/core/Sk2x.h b/src/core/Sk2x.h
new file mode 100644
index 0000000000..6b3fd86b27
--- /dev/null
+++ b/src/core/Sk2x.h
@@ -0,0 +1,72 @@
+/*
+ * 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 Sk2x_DEFINED
+#define Sk2x_DEFINED
+
+#include "SkTypes.h"
+
+#define SK2X_PREAMBLE 1
+    #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
+        #include "../opts/Sk2x_sse.h"
+    #else
+        #include "../opts/Sk2x_none.h"
+    #endif
+#undef SK2X_PREAMBLE
+
+template <typename T> class Sk2x;
+typedef Sk2x<float>  Sk2f;
+typedef Sk2x<double> Sk2d;
+
+#if SK_SCALAR_IS_FLOAT
+    typedef Sk2f Sk2s;
+#elif SK_SCALAR_IS_DOUBLE
+    typedef Sk2d Sk2s;
+#endif
+
+// This API is meant to be manageably small, not comprehensive.
+// Please talk to mtklein if you find yourself wanting more.
+template <typename T> class Sk2x {
+public:
+    Sk2x();  // Uninitialized; use Sk2x(0) for zero.
+    explicit Sk2x(T);  // Same as Sk2x(T,T);
+    Sk2x(T, T);
+
+    Sk2x(const Sk2x& o) { *this = o; }
+    Sk2x& operator=(const Sk2x&);
+
+    // These assume no particular alignment.
+    static Sk2x Load(const T[2]);
+    void store(T[2]) const;
+
+    Sk2x      add(const Sk2x&) const;
+    Sk2x subtract(const Sk2x&) const;
+    Sk2x multiply(const Sk2x&) const;
+
+    Sk2x rsqrt() const;   // Approximate 1/this->sqrt().
+    Sk2x  sqrt() const;   // this->multiply(this->rsqrt()) may be faster, but less precise.
+
+    static Sk2x Min(const Sk2x&, const Sk2x&);
+    static Sk2x Max(const Sk2x&, const Sk2x&);
+
+private:
+#define SK2X_PRIVATE 1
+    #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
+        #include "../opts/Sk2x_sse.h"
+    #else
+        #include "../opts/Sk2x_none.h"
+    #endif
+#undef SK2X_PRIVATE
+};
+
+#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
+    #include "../opts/Sk2x_sse.h"
+#else
+    #include "../opts/Sk2x_none.h"
+#endif
+
+#endif//Sk2x_DEFINED