[Sema] Fix type mismatch error when arguments to elementwise math builtin have different qualifiers, which should be well-formed (#141485)

Fixes #141397
Element-wise math builtins (e.g.
__builtin_elementwise_max/__builtin_elementwise_pow etc.) fail when
their arguments have different qualifications, but should be
well-formed. The fix is ​​to use hasSameUnqualifiedType to check if the
arguments match.

Author: actinks

clang/docs/ReleaseNotes.rst

@@ -669,6 +669,7 @@ Bug Fixes in This Version
   base classes. (GH139452)
 - Fixed an assertion failure in serialization of constexpr structs containing unions. (#GH140130)
 - Fixed duplicate entries in TableGen that caused the wrong attribute to be selected. (GH#140701)
+- Fixed type mismatch error when 'builtin-elementwise-math' arguments have different qualifiers, this should be well-formed. (#GH141397)
 
 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

clang/lib/Sema/SemaChecking.cpp

@@ -15572,7 +15572,7 @@ Sema::BuiltinVectorMath(CallExpr *TheCall,
   if (checkMathBuiltinElementType(*this, LocA, TyA, ArgTyRestr, 1))
     return std::nullopt;
 
-  if (TyA.getCanonicalType() != TyB.getCanonicalType()) {
+  if (!Context.hasSameUnqualifiedType(TyA, TyB)) {
     Diag(LocA, diag::err_typecheck_call_different_arg_types) << TyA << TyB;
     return std::nullopt;
   }

clang/test/Sema/builtins-elementwise-math.c

@@ -3,6 +3,7 @@
 typedef double double2 __attribute__((ext_vector_type(2)));
 typedef double double4 __attribute__((ext_vector_type(4)));
 typedef float float2 __attribute__((ext_vector_type(2)));
+typedef float float3 __attribute__((ext_vector_type(3)));
 typedef float float4 __attribute__((ext_vector_type(4)));
 
 typedef int int2 __attribute__((ext_vector_type(2)));
@@ -1202,3 +1203,13 @@ void test_builtin_elementwise_fma(int i32, int2 v2i32, short i16,
   c3 = __builtin_elementwise_fma(f32, f32, c3);
   // expected-error@-1 {{3rd argument must be a scalar or vector of floating-point types (was '_Complex float')}}
 }
+
+typedef struct {
+  float3 b;
+} struct_float3;
+// This example uncovered a bug #141397 :
+// Type mismatch error when 'builtin-elementwise-math' arguments have different qualifiers, this should be well-formed
+float3 foo(float3 a,const struct_float3* hi) {
+  float3 b = __builtin_elementwise_max((float3)(0.0f), a);
+  return __builtin_elementwise_pow(b, hi->b.yyy);
+}