The Cortex-M4 Instruction Set
ARM DUI 0553A Copyright © 2010 ARM. All rights reserved. 3-43
ID121610 Non-Confidential
Example 3-4 64-bit addition
ADDS R4, R0, R2 ; add the least significant words
ADC R5, R1, R3 ; add the most significant words with carry
Multiword values do not have to use consecutive registers. Example 3-5 shows instructions that
subtract a 96-bit integer contained in R9, R1, and R11 from another contained in R6, R2, and
R8. The example stores the result in R6, R9, and R2.
Example 3-5 96-bit subtraction
SUBS R6, R6, R9 ; subtract the least significant words
SBCS R9, R2, R1 ; subtract the middle words with carry
SBC R2, R8, R11 ; subtract the most significant words with carry
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