diff --git a/llvm/test/tools/llvm-cxxfilt/delimiters.test b/llvm/test/tools/llvm-cxxfilt/delimiters.test
--- a/llvm/test/tools/llvm-cxxfilt/delimiters.test
+++ b/llvm/test/tools/llvm-cxxfilt/delimiters.test
@@ -66,4 +66,4 @@
 CHECK: Foo~,,
 CHECK: Foo⦙Bar
 CHECK: Foo,,Bar::Baz  Foo,Bar:Baz
-CHECK: _Z3Foo$ ._Z3Foo
+CHECK: _Z3Foo$ .Foo
diff --git a/llvm/test/tools/llvm-cxxfilt/prefix-dot.test b/llvm/test/tools/llvm-cxxfilt/prefix-dot.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/llvm-cxxfilt/prefix-dot.test
@@ -0,0 +1,9 @@
+## Show that the llvm-cxxfilt does not consider the prefix dot to be part of the symbol name to be demangled.
+
+RUN: echo '._Z3Foo ._Z3f.0v' \
+RUN:      '._ZL5func0v ._Z5func1i' > %t
+RUN:      llvm-cxxfilt -n < %t | FileCheck %s
+
+CHECK: .Foo .f.0()
+CHECK: .func0()
+CHECK: .func1(int)
diff --git a/llvm/tools/llvm-cxxfilt/llvm-cxxfilt.cpp b/llvm/tools/llvm-cxxfilt/llvm-cxxfilt.cpp
--- a/llvm/tools/llvm-cxxfilt/llvm-cxxfilt.cpp
+++ b/llvm/tools/llvm-cxxfilt/llvm-cxxfilt.cpp
@@ -67,13 +67,19 @@
 static std::string demangle(const std::string &Mangled) {
   using llvm::itanium_demangle::starts_with;
   std::string_view DecoratedStr = Mangled;
-  if (StripUnderscore)
-    if (DecoratedStr[0] == '_')
-      DecoratedStr.remove_prefix(1);
+  std::string DotPrefix;
+
+  if (StripUnderscore && DecoratedStr[0] == '_')
+    DecoratedStr.remove_prefix(1);
+  // Do not consider the prefix dot as part of the demangled symbol name.
+  else if (DecoratedStr[0] == '.') {
+    DecoratedStr.remove_prefix(1);
+    DotPrefix = ".";
+  }
 
   std::string Result;
   if (nonMicrosoftDemangle(DecoratedStr, Result))
-    return Result;
+    return DotPrefix + Result;
 
   std::string Prefix;
   char *Undecorated = nullptr;
@@ -86,7 +92,7 @@
     Undecorated = itaniumDemangle(DecoratedStr.substr(6));
   }
 
-  Result = Undecorated ? Prefix + Undecorated : Mangled;
+  Result = Undecorated ? DotPrefix + Prefix + Undecorated : Mangled;
   free(Undecorated);
   return Result;
 }