adding fp16 direct that reads pre-vectorized data

[ROCm/composable_kernel commit: 4f0fc72e91]

src/include/common.hip.hpp

@@ -28,44 +28,44 @@ struct vector_type
 template <>
 struct vector_type<float, 1>
 {
-    using type = float;
+    using VectorType = float;
 };
 
 template <>
 struct vector_type<float, 2>
 {
-    using type = float2;
+    using VectorType = float2;
 };
 
 template <>
 struct vector_type<float, 4>
 {
-    using type = float4;
+    using VectorType = float4;
 };
 
 #if 0
 template <>
 struct vector_type<half_float::half, 1>
 {
-    using type = half_float::half;
+    using VectorType = half_float::half;
 };
 
 template <>
 struct vector_type<half_float::half, 2>
 {
-    using type = float;
+    using VectorType = float;
 };
 
 template <>
 struct vector_type<half_float::half, 4>
 {
-    using type = float2;
+    using VectorType = float2;
 };
 
 template <>
 struct vector_type<half_float::half, 8>
 {
-    using type = float4;
+    using VectorType = float4;
 };
 #endif
 
@@ -73,25 +73,41 @@ struct vector_type<half_float::half, 8>
 template <>
 struct vector_type<half, 1>
 {
-    using type = half;
+    using VectorType = half;
+
+    __host__ __device__ static VectorType pack(half s) { return s; }
 };
 
 template <>
 struct vector_type<half, 2>
 {
-    using type = half2;
+    using VectorType = half2;
+
+    union Data
+    {
+        VectorType vector;
+        half scalar[2];
+    };
+
+    __host__ __device__ static VectorType pack(half s0, half s1)
+    {
+        Data data;
+        data.scalar[0] = s0;
+        data.scalar[1] = s1;
+        return data.vector;
+    }
 };
 
 template <>
 struct vector_type<half, 4>
 {
-    using type = float2;
+    using VectorType = float2;
 };
 
 template <>
 struct vector_type<half, 8>
 {
-    using type = float4;
+    using VectorType = float4;
 };
 #endif