Ignore decode table conflicts in the tMOVgpr2tgpr, tMOVgpr2gpr, and tMOVtgpr2gpr

instructions. They are handled as special moves, but encoded as a normal move.

llvm-svn: 120779

llvm/utils/TableGen/ARMDecoderEmitter.cpp

@@ -1731,6 +1731,13 @@ ARMDEBackend::populateInstruction(const CodeGenInstruction &CGI,
         Name == "tSpill" || Name == "tLDRcp" || Name == "tRestore" ||
         Name == "t2LEApcrelJT" || Name == "t2MOVCCi16")
       return false;
+
+    // tMOVgpr2tgpr, tMOVgpr2gpr, and tMOVtgpr2gpr are used by the code
+    // generator for special kinds of moves, but are encoded the same. Safely
+    // ignore them here.
+    if (Name == "tMOVgpr2tgpr" || Name == "tMOVgpr2gpr" ||
+        Name == "tMOVtgpr2gpr")
+      return false;
   }
 
   // Dumps the instruction encoding format.