case 't': // top of floating point stack.
case 'u': // second from top of floating point stack.
case 'q': // a, b, c, d registers or any integer register in 64-bit.
- case 'Z': // 32-bit integer constant for used with zero-extending x86_64
+ case 'Z': // 32-bit integer constant for use with zero-extending x86_64
+ // instructions.
+ case 'N': // unsigned 8-bit integer constant for use with in and out
// instructions.
info = (TargetInfo::ConstraintInfo)(info|TargetInfo::CI_AllowsRegister);
return true;