Datasheet

SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
102
To use an instruction width suffix, place it immediately after the instruction mnemonic and condition code, if any.
The example below shows instructions with the instruction width suffix.
BCS.W label ; creates a 32-bit instruction even for a short
; branch
ADDS.W R0, R0, R1 ; creates a 32-bit instruction even though the same
; operation can be done by a 16-bit instruction