Add Float16 as a Scalar type option (#180)

* Add Float16

Author: kmpeng

include/Support/Pipeline.h

@@ -40,6 +40,7 @@ enum class DataFormat {
   Int16,
   Int32,
   Int64,
+  Float16,
   Float32,
   Float64,
   Bool,
@@ -88,6 +89,7 @@ struct Buffer {
     case DataFormat::Hex16:
     case DataFormat::UInt16:
     case DataFormat::Int16:
+    case DataFormat::Float16:
       return 2;
     case DataFormat::Hex32:
     case DataFormat::UInt32:
@@ -340,6 +342,7 @@ template <> struct ScalarEnumerationTraits<offloadtest::DataFormat> {
     ENUM_CASE(Int16);
     ENUM_CASE(Int32);
     ENUM_CASE(Int64);
+    ENUM_CASE(Float16);
     ENUM_CASE(Float32);
     ENUM_CASE(Float64);
     ENUM_CASE(Bool);

lib/Support/Pipeline.cpp

@@ -127,6 +127,7 @@ void MappingTraits<offloadtest::Buffer>::mapping(IO &I,
     DATA_CASE(Int16, int16_t)
     DATA_CASE(Int32, int32_t)
     DATA_CASE(Int64, int64_t)
+    DATA_CASE(Float16, uint16_t)
     DATA_CASE(Float32, float)
     DATA_CASE(Float64, double)
     DATA_CASE(Bool, uint32_t) // Because sizeof(bool) is 1 but HLSL represents a bool using 4 bytes.