CHKFEAT Check feature status This instruction indicates the status of features. For more information, see Check Feature. If FEAT_CHK is not implemented, this instruction executes as a NOP. 1 1 0 1 0 1 0 1 0 0 0 0 0 0 1 1 0 0 1 0 0 1 0 1 0 0 0 1 1 1 1 1 CHKFEAT X16 if !IsFeatureImplemented(FEAT_CHK) then EndOfDecode(Decode_NOP); end; X{64}(16) = AArch64_ChkFeat(X{64}(16)); 2026-03-12 12:23:09 2025-09_rel_asl1