CBZ Compare and branch on zero This instruction compares the value in a register with zero, and conditionally branches to a label at a PC-relative offset if the comparison is equal. It provides a hint that this is not a subroutine call or return. This instruction does not affect condition flags. 0 1 1 0 1 0 0 0 CBZ <Wt>, <label> 1 CBZ <Xt>, <label> constant integer t = UInt(Rt); constant integer datasize = 32 << UInt(sf); constant bits(64) offset = SignExtend(imm19:'00', 64); <Wt> Is the 32-bit name of the general-purpose register to be tested, encoded in the "Rt" field. <label> Is the program label to be conditionally branched to. Its offset from the address of this instruction, in the range +/-1MB, is encoded as "imm19" times 4. <Xt> Is the 64-bit name of the general-purpose register to be tested, encoded in the "Rt" field. constant boolean branch_conditional = TRUE; constant bits(datasize) operand1 = X[t, datasize]; if IsZero(operand1) then BranchTo(PC64 + offset, BranchType_DIR, branch_conditional); else BranchNotTaken(BranchType_DIR, branch_conditional);