move distance_impl to details namespace

Author: farzonl

clang/lib/Headers/hlsl/hlsl_detail.h

@@ -41,6 +41,18 @@ constexpr enable_if_t<sizeof(U) == sizeof(T), U> bit_cast(T F) {
   return __builtin_bit_cast(U, F);
 }
 
+template <typename T>
+constexpr enable_if_t<is_same<float, T>::value || is_same<half, T>::value, T>
+distance_impl(T X, T Y) {
+  return __builtin_elementwise_abs(X - Y);
+}
+
+template <typename T, int N>
+constexpr enable_if_t<is_same<float, T>::value || is_same<half, T>::value, T>
+distance_vec_impl(vector<T, N> X, vector<T, N> Y) {
+  return __builtin_hlsl_length(X - Y);
+}
+
 } // namespace __detail
 } // namespace hlsl
 #endif //_HLSL_HLSL_DETAILS_H_

clang/lib/Headers/hlsl/hlsl_intrinsics.h

@@ -880,34 +880,24 @@ float4 degrees(float4);
 /// \param X The X input value.
 /// \param Y The Y input value.
 
-template <typename T>
-constexpr __detail::enable_if_t<
-    __detail::is_same<float, T>::value || __detail::is_same<half, T>::value, T>
-distance_impl(T X, T Y) {
-  return __builtin_elementwise_abs(X - Y);
-}
-
-template <typename T, int N>
-constexpr __detail::enable_if_t<
-    __detail::is_same<float, T>::value || __detail::is_same<half, T>::value, T>
-distance_vec_impl(vector<T, N> X, vector<T, N> Y) {
-  return __builtin_hlsl_length(X - Y);
-}
-
 _HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
-const inline half distance(half X, half Y) { return distance_impl(X, Y); }
+const inline half distance(half X, half Y) {
+  return __detail::distance_impl(X, Y);
+}
 
 template <int N>
 _HLSL_16BIT_AVAILABILITY(shadermodel, 6.2)
 const inline half distance(vector<half, N> X, vector<half, N> Y) {
-  return distance_vec_impl(X, Y);
+  return __detail::distance_vec_impl(X, Y);
 }
 
-const inline float distance(float X, float Y) { return distance_impl(X, Y); }
+const inline float distance(float X, float Y) {
+  return __detail::distance_impl(X, Y);
+}
 
 template <int N>
 const inline float distance(vector<float, N> X, vector<float, N> Y) {
-  return distance_vec_impl(X, Y);
+  return __detail::distance_vec_impl(X, Y);
 }
 
 //===----------------------------------------------------------------------===//