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.
Variants: FEAT_CHK (ARMv9.4)
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 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 |
| CRm | op2 | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
CHKFEAT X16
if !IsFeatureImplemented(FEAT_CHK) then EndOfDecode(Decode_NOP);
X[16, 64] = AArch64.ChkFeat(X[16, 64]);