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USAD8

Unsigned Sum of Absolute Differences.

Syntax

USAD8{cond} {Rd}, Rn, Rm

where:

cond

is an optional condition code.

Rd

is the destination register.

Rn

is the register holding the first operand.

Rm

is the register holding the second operand.

Operation

The USAD8 instruction finds the four differences between the unsigned values in corresponding bytes of Rn and Rm. It adds the absolute values of the four differences, and saves the result to Rd.

Register restrictions

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.

Condition flags

This instruction does not alter any flags.

Availability

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 ARMv7E-M implementation.

There is no 16-bit version of this instruction in T32.

Example

    USAD8       r2, r4, r6
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