diff --git a/utils/TableGen/X86RecognizableInstr.cpp b/utils/TableGen/X86RecognizableInstr.cpp
index 8de948a..a7ce657 100644
--- a/utils/TableGen/X86RecognizableInstr.cpp
+++ b/utils/TableGen/X86RecognizableInstr.cpp
@@ -522,7 +522,7 @@
 
   // Filter out alternate forms of AVX instructions
   if (Name.find("_alt") != Name.npos ||
-      (Name.find("r64r") != Name.npos && Name.find("r64r64") == Name.npos) ||
+      (Name.find("r64r") != Name.npos && Name.find("r64r64") == Name.npos && Name.find("r64r8") == Name.npos) ||
       Name.find("_64mr") != Name.npos ||
       Name.find("rr64") != Name.npos)
     return FILTER_WEAK;