[AMDGPU] Treating HIP/C++ _Float16 same as OpenCL's half

Author: ranapratap55

clang/lib/AST/ASTContext.cpp

@@ -10527,6 +10527,21 @@ bool ASTContext::areCompatibleVectorTypes(QualType FirstVec,
       Second->getVectorKind() != VectorKind::RVVFixedLengthMask_4)
     return true;
 
+  // In OpenCL, treat half and _Float16 vector types as compatible.
+  if (getLangOpts().OpenCL &&
+      First->getNumElements() == Second->getNumElements()) {
+    QualType FirstElt = First->getElementType();
+    QualType SecondElt = Second->getElementType();
+
+    if ((FirstElt->isFloat16Type() && SecondElt->isHalfType()) ||
+        (FirstElt->isHalfType() && SecondElt->isFloat16Type())) {
+      if (First->getVectorKind() != VectorKind::AltiVecPixel &&
+          First->getVectorKind() != VectorKind::AltiVecBool &&
+          Second->getVectorKind() != VectorKind::AltiVecPixel &&
+          Second->getVectorKind() != VectorKind::AltiVecBool)
+        return true;
+    }
+  }
   return false;
 }
 

clang/test/SemaOpenCL/builtins-extended-image-param-gfx1100-err.cl

@@ -5,7 +5,7 @@
 
 typedef int int4 __attribute__((ext_vector_type(4)));
 typedef float float4 __attribute__((ext_vector_type(4)));
-typedef _Float16 half4 __attribute__((ext_vector_type(4)));
+typedef half half4 __attribute__((ext_vector_type(4)));
 
 float4 test_amdgcn_image_gather4_lz_2d_v4f32_f32_r(float4 v4f32, float f32, int i32, __amdgpu_texture_t tex, int4 vec4i32) {
 

clang/test/SemaOpenCL/builtins-extended-image-param-gfx942-err.cl

@@ -5,7 +5,7 @@
 
 typedef int int4 __attribute__((ext_vector_type(4)));
 typedef float float4 __attribute__((ext_vector_type(4)));
-typedef _Float16 half4 __attribute__((ext_vector_type(4)));
+typedef half half4 __attribute__((ext_vector_type(4)));
 
 float4 test_amdgcn_image_gather4_lz_2d_v4f32_f32_r(float4 v4f32, float f32, int i32, __amdgpu_texture_t tex, int4 vec4i32) {