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

Legacy Instruction Mnemonics
C.1 Thumb instruction mnemonics
Table C-1 lists the UAL equivalents of the mnemonics used in pre-UAL Thumb assembly language. Except
where noted, the Thumb mnemonics conflict with UAL and cannot be supported by assemblers as
synonyms. Thumb code cannot be correctly assembled by a UAL assembler unless these changes are made.
All other Thumb instructions are the same in UAL as in Thumb assembler language, or can be supported as
synonyms.
Table C-1 Thumb instruction mnemonics
Former Thumb assembler mnemonic UAL equivalent
ADC ADCS
ADD ADDS a
AND ANDS
ASR ASRS
BIC BICS
EOR EORS
LSL LSLS
MOV ,# MOVS ,#
MOV , ADDS ,,#0 b
MUL MULS
MVN MVNS
ORR ORRS
ROR RORS
SBC SBCS
SUB SUBS c
a. If either or both of the operands is R8-R15, ADD not ADDS.
b. If either or both of the operands is R8-R15, MOV , not ADDS ,,#0.
c. If the operand register is SP, SUB not SUBS.
AppxC-2 Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. ARM DDI 0406B