skeleton for float <-> half optimized procs

tests/Float16Test.cpp

Index: tests/Float16Test.cpp
diff --git a/tests/Float16Test.cpp b/tests/Float16Test.cpp
index 0a2c3d5d6b62b09fc523aeb633655b4f124bb8ac..f437268c79faedacab7f02df01ebd2d33c917cff 100644
--- a/tests/Float16Test.cpp
+++ b/tests/Float16Test.cpp
@@ -8,6 +8,7 @@
 #include "Test.h"
 #include "SkColor.h"
 #include "SkHalf.h"
+#include "SkOpts.h"
 #include "SkPixmap.h"
 
 static bool eq_within_half_float(float a, float b) {
@@ -50,3 +51,16 @@ DEF_TEST(color_half_float, reporter) {
         }
     }
 }
+
+DEF_TEST(float_to_half, reporter) {
+    const float    fs[] = {    1.0,    2.0,    3.0,    4.0,    5.0,    6.0,    7.0 };
+    const uint16_t hs[] = { 0x3c00, 0x4000, 0x4200, 0x4400, 0x4500, 0x4600, 0x4700 };
+
+    uint16_t hscratch[7];
+    SkOpts::float_to_half(hscratch, fs, 7);
+    REPORTER_ASSERT(reporter, 0 == memcmp(hscratch, hs, sizeof(hs)));
+
+    float fscratch[7];
+    SkOpts::half_to_float(fscratch, hs, 7);
+    REPORTER_ASSERT(reporter, 0 == memcmp(fscratch, fs, sizeof(fs)));
+}