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

Assembler syntax
USAX {,} ,
where:
See Standard assembler syntax fields on page A8-7.
The destination register.
The first operand register.
The second operand register.
The pre-UAL syntax USUBADDX is equivalent to USAX.
Operation
if ConditionPassed() then
EncodingSpecificOperations();
sum = UInt(R[n]) + UInt(R[m]);
diff = UInt(R[n]) - UInt(R[m]);
R[d] = sum;
R[d] = diff;
APSR.GE = if sum >= 0x10000 then ‘11’ else ‘00’;
APSR.GE = if diff >= 0 then ‘11’ else ‘00’;
Exceptions
None.
Instruction Details
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. A8-509