Implement mangling for matrix types

Author: Losy001

clang/lib/AST/MicrosoftMangle.cpp

@@ -3526,7 +3526,22 @@ void MicrosoftCXXNameMangler::mangleType(const DependentSizedExtVectorType *T,
 
 void MicrosoftCXXNameMangler::mangleType(const ConstantMatrixType *T,
                                          Qualifiers quals, SourceRange Range) {
-  Error(Range.getBegin(), "matrix type") << Range;
+  QualType EltTy = T->getElementType();
+  const BuiltinType *ET = EltTy->getAs<BuiltinType>();
+
+  llvm::SmallString<64> TemplateMangling;
+  llvm::raw_svector_ostream Stream(TemplateMangling);
+  MicrosoftCXXNameMangler Extra(Context, Stream);
+
+  Stream << "?$";
+
+  Extra.mangleSourceName("__matrix");
+  Extra.mangleType(EltTy, Range, QMM_Escape);
+
+  Extra.mangleIntegerLiteral(llvm::APSInt::getUnsigned(T->getNumRows()));
+  Extra.mangleIntegerLiteral(llvm::APSInt::getUnsigned(T->getNumColumns()));
+
+  mangleArtificialTagType(TagTypeKind::Struct, TemplateMangling, {"__clang"});
 }
 
 void MicrosoftCXXNameMangler::mangleType(const DependentSizedMatrixType *T,