Add Shadermodel 6.2 macro to hlsl_intrinsics.h

Author: metkarpoonam

clang/lib/Headers/hlsl/hlsl_intrinsics.h

@@ -90,20 +90,20 @@ void asuint(double4, out uint4, out uint4);
 #ifdef __HLSL_ENABLE_16_BIT
 
 template <typename T, int N>
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 constexpr __detail::enable_if_t<__detail::is_same<int16_t, T>::value ||
                                     __detail::is_same<uint16_t, T>::value ||
                                     __detail::is_same<half, T>::value,
-                                vector<int16_t, N>>
-asint16(vector<T, N> V) {
+                                vector<int16_t, N>> asint16(vector<T, N> V) {
   return __detail::bit_cast<int16_t, T, N>(V);
 }
 
 template <typename T>
+_HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 constexpr __detail::enable_if_t<__detail::is_same<int16_t, T>::value ||
                                     __detail::is_same<uint16_t, T>::value ||
                                     __detail::is_same<half, T>::value,
-                                int16_t>
-asint16(T F) {
+                                int16_t> asint16(T F) {
   return __detail::bit_cast<int16_t, T>(F);
 }
 #endif

clang/test/CodeGenHLSL/builtins/asint16.hlsl

@@ -57,3 +57,4 @@ int16_t4 fn(half4 p1)
 {
     return asint16(p1);
 }
+

clang/test/SemaHLSL/BuiltIns/asint16-errors.hlsl

@@ -40,3 +40,4 @@ int16_t4 test_asint16_vector_float(float4 p1)
   // expected-note@hlsl/hlsl_intrinsics.h:* {{candidate template ignored: substitution failure [with T = float, N = 4]: no type named 'Type'}}
   // expected-note@hlsl/hlsl_intrinsics.h:* {{candidate template ignored: substitution failure [with T = float4]: no type named 'Type'}}
 }
+