BLR Branch with link to register This instruction calls a subroutine at an address in a register, setting register X30 to PC+4. 1 1 0 1 0 1 1 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 BLR <Xn> constant integer n = 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. constant bits(64) target = X[n, 64]; if IsFeatureImplemented(FEAT_GCS) && GCSPCREnabled(PSTATE.EL) then AddGCSRecord(PC64 + 4); // Value in BTypeNext will be used to set PSTATE.BTYPE BTypeNext = '10'; X[30, 64] = PC64 + 4; constant boolean branch_conditional = FALSE; BranchTo(target, BranchType_INDCALL, branch_conditional);