ARM Cortex-M4 - Page 104

The Cortex-M4 Instruction Set
ARM DUI 0553A Copyright © 2010 ARM. All rights reserved. 3-57
ID121610 Non-Confidential
Examples
SHASX R7, R4, R2 ; Adds top halfword of R4 to bottom halfword of R2
; and writes halved result to top halfword of R7
; Subtracts top halfword of R2 from bottom halfword of
; R4 and writes halved result to bottom halfword of R7
SHSAX R0, R3, R5 ; Subtracts bottom halfword of R5 from top halfword
; of R3 and writes halved result to top halfword of R0
; Adds top halfword of R5 to bottom halfword of R3 and
; writes halved result to bottom halfword of R0.