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 operand.
You can use SP in A32 instructions but this is deprecated. You cannot use SP in T32 instructions.
This instruction does not alter any flags.
The 32-bit instruction is available in A32 and T32.
For the Armv7‑M architecture, the 32-bit T32 instruction is only available in an Arm®v7E-M implementation.
There is no 16-bit version of this instruction in T32.
USAD8 r2, r4, r6