Index: src/SymTab/Mangler.cc
===================================================================
--- src/SymTab/Mangler.cc	(revision 96812c08a8de9308f7cd2aa6c43b95d71bf1bba1)
+++ src/SymTab/Mangler.cc	(revision 054514d366b6a7a6863d673a9c760baa03661f21)
@@ -171,7 +171,14 @@
 					"w",	// SignedInt128
 					"Uw",	// UnsignedInt128
+					"a",   // Float80
+					"A",   // Float128
 				};
+				static_assert(
+					sizeof(btLetter)/sizeof(btLetter[0]) == BasicType::NUMBER_OF_BASIC_TYPES,
+					"Each basic type kind should have a corresponding mangler letter"
+				);
 
 				printQualifiers( basicType );
+				assert( basicType->get_kind() < sizeof(btLetter)/sizeof(btLetter[0]) );
 				mangleName << btLetter[ basicType->get_kind() ];
 			}