Unsigned Sum of Absolute Differences.
is an optional condition code.
is the destination register.
is the register holding the first operand.
is the register holding the second operand.
USAD8 instruction finds the
four differences between the unsigned values in corresponding bytes
It adds the absolute values of the four differences, and saves the
You cannot use PC for any register.
You can use SP in ARM instructions but this is deprecated in ARMv6T2 and above. You cannot use SP in Thumb instructions.
This instruction does not alter any flags.
This ARM instruction is available in ARMv6 and above.
This 32-bit Thumb instruction is available in ARMv6T2 and above. For the ARMv7-M architecture, it is only available in an ARMv7E-M implementation.
There is no 16-bit version of this instruction in Thumb.
USAD8 r2, r4, r6