[HLSL] Reorganize aliased intrinsics into their own file (#129619)

- fixes #129616
- alphabetize the or intrinsic

clang/lib/Headers/CMakeLists.txt

@@ -86,6 +86,7 @@ set(hlsl_h
   )
 set(hlsl_subdir_files
   hlsl/hlsl_basic_types.h
+  hlsl/hlsl_alias_intrinsics.h
   hlsl/hlsl_intrinsics.h
   hlsl/hlsl_detail.h
   )

clang/lib/Headers/hlsl/hlsl_detail.h

@@ -9,6 +9,8 @@
 #ifndef _HLSL_HLSL_DETAILS_H_
 #define _HLSL_HLSL_DETAILS_H_
 
+#include "hlsl_alias_intrinsics.h"
+
 namespace hlsl {
 
 namespace __detail {
@@ -55,7 +57,7 @@ constexpr vector<uint, 4> d3d_color_to_ubyte4_impl(vector<float, 4> V) {
 template <typename T>
 constexpr enable_if_t<is_same<float, T>::value || is_same<half, T>::value, T>
 length_impl(T X) {
-  return __builtin_elementwise_abs(X);
+  return abs(X);
 }
 
 template <typename T, int N>
@@ -64,7 +66,7 @@ length_vec_impl(vector<T, N> X) {
 #if (__has_builtin(__builtin_spirv_length))
   return __builtin_spirv_length(X);
 #else
-  return __builtin_elementwise_sqrt(__builtin_hlsl_dot(X, X));
+  return sqrt(dot(X, X));
 #endif
 }
 
@@ -91,7 +93,7 @@ constexpr vector<T, L> reflect_vec_impl(vector<T, L> I, vector<T, L> N) {
 #if (__has_builtin(__builtin_spirv_reflect))
   return __builtin_spirv_reflect(I, N);
 #else
-  return I - 2 * N * __builtin_hlsl_dot(I, N);
+  return I - 2 * N * dot(I, N);
 #endif
 }
 

clang/test/SemaHLSL/WaveBuiltinAvailability.hlsl

@@ -5,6 +5,6 @@
 [numthreads(8,8,1)]
 unsigned foo() {
     // expected-error@#site {{'WaveActiveCountBits' is only available on Shader Model 6.0 or newer}}
-    // expected-note@hlsl/hlsl_intrinsics.h:* {{'WaveActiveCountBits' has been marked as being introduced in Shader Model 6.0 here, but the deployment target is Shader Model 5.0}}
+    // expected-note@hlsl/hlsl_alias_intrinsics.h:* {{'WaveActiveCountBits' has been marked as being introduced in Shader Model 6.0 here, but the deployment target is Shader Model 5.0}}
     return hlsl::WaveActiveCountBits(1); // #site
 }