/// to a Zero terminated array of registers that this register aliases. This is
/// needed for architectures like X86 which have AL alias AX alias EAX.
/// Registers that this does not apply to simply should set this to null.
+/// The SubRegs field is a zero terminated array of registers that are
+/// sub-registers of the specific register, e.g. AL, AH are sub-registers of AX.
///
struct TargetRegisterDesc {
const char *Name; // Assembly language name for the register
const unsigned *AliasSet; // Register Alias Set, described above
+ const unsigned *SubRegs; // Sub-register set, described above
};
class TargetRegisterClass {