diff --git a/llvm/utils/TableGen/X86RecognizableInstr.cpp b/llvm/utils/TableGen/X86RecognizableInstr.cpp
--- a/llvm/utils/TableGen/X86RecognizableInstr.cpp
+++ b/llvm/utils/TableGen/X86RecognizableInstr.cpp
@@ -1065,11 +1065,6 @@
   ENCODING("VK16",            ENCODING_RM)
   ENCODING("VK32",            ENCODING_RM)
   ENCODING("VK64",            ENCODING_RM)
-  ENCODING("VK1PAIR",         ENCODING_RM)
-  ENCODING("VK2PAIR",         ENCODING_RM)
-  ENCODING("VK4PAIR",         ENCODING_RM)
-  ENCODING("VK8PAIR",         ENCODING_RM)
-  ENCODING("VK16PAIR",        ENCODING_RM)
   ENCODING("BNDR",            ENCODING_RM)
   ENCODING("TILE",            ENCODING_RM)
   errs() << "Unhandled R/M register encoding " << s << "\n";
@@ -1148,11 +1143,6 @@
   ENCODING("VK16",            ENCODING_VVVV)
   ENCODING("VK32",            ENCODING_VVVV)
   ENCODING("VK64",            ENCODING_VVVV)
-  ENCODING("VK1PAIR",         ENCODING_VVVV)
-  ENCODING("VK2PAIR",         ENCODING_VVVV)
-  ENCODING("VK4PAIR",         ENCODING_VVVV)
-  ENCODING("VK8PAIR",         ENCODING_VVVV)
-  ENCODING("VK16PAIR",        ENCODING_VVVV)
   ENCODING("TILE",            ENCODING_VVVV)
   errs() << "Unhandled VEX.vvvv register encoding " << s << "\n";
   llvm_unreachable("Unhandled VEX.vvvv register encoding");