Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

## AUTIB171615

Authenticate Instruction address, using key B. This instruction authenticates an instruction address, using two modifiers and key B. The address is in X17. The 64-bit value of modifier1 is the value in X16. The 64-bit value of modifier2 is the value in X15.

If the authentication passes, the upper bits of the address are restored to enable subsequent use of the address. For information on behavior if the authentication fails, see Faulting on pointer authentication.

### Integer
(FEAT_PAuth_LR)

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 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0
sf |  | S |  | opcode2 | opcode | Rn | Rd

####

AUTIB171615

if !IsFeatureImplemented(FEAT_PAuth_LR) then UNDEFINED;

### Operation

X[17, 64] = AuthIB2(X[17, 64], X[16, 64], X[15, 64], FALSE);

Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

Internal version only: aarchmrs v2024-03_relA, pseudocode v2024-03_rel, sve v2024-03_rel ; Build timestamp: 2024-03-26T09:45

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