ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

Instruction Details
A8.6.27 CBNZ, CBZ
Compare and Branch on Nonzero and Compare and Branch on Zero compare the value in a register with
zero, and conditionally branch forward a constant value. They do not affect the condition flags.
Encoding T1 ARMv6T2, ARMv7
CB{N}Z , Not permitted in IT block.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 1 1 op 0 i 1 imm5 Rn
n = UInt(Rn); imm32 = ZeroExtend(i:imm5:’0’, 32); nonzero = (op == ‘1’);
if InITBlock() then UNPREDICTABLE;
A8-66 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B