https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78057

--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
+       case IX86_BUILTIN_TZCNT16:
+       case IX86_BUILTIN_TZCNT32:
+       case IX86_BUILTIN_TZCNT64:
+         if (n_args == 1 && TREE_CODE (args[0]) == INTEGER_CST)

Maybe:
        ...
        case IX86_BUILTIN_TZCNT64:
          assert (n_args == 1);
          if (TREE_CODE (args[0]) == INTEGER_CST)

These builtins are defined in the compiler and have known prototype.

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