Return from subroutine
This instruction branches unconditionally to an address in a register. This instruction provides a hint that this is a subroutine return.
| 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 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | Rn | 0 | 0 | 0 | 0 | 0 | ||||
| Z | op | op2 | A | M | Rm | ||||||||||||||||||||||||||
let n : integer{} = UInt(Rn);
| <Xn> |
Is the 64-bit name of the general-purpose register holding the address to be branched to, encoded in the "Rn" field. Defaults to X30 if absent. |
var target : bits(64) = X{}(n); if IsFeatureImplemented(FEAT_GCS) && GCSPCREnabled(PSTATE.EL) then target = LoadCheckGCSRecord(target, GCSInstType_PRET); SetCurrentGCSPointer(GetCurrentGCSPointer() + 8); end; // Value in BTypeNext will be used to set PSTATE.BTYPE BTypeNext = '00'; let branch_conditional : boolean = FALSE; BranchTo{64}(target, BranchType_RET, branch_conditional);
2026-03_rel 2026-03-26 20:48:11
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