Unsigned saturating parallel byte-wise subtraction.
is an optional condition code.
is the destination register.
are the ARM registers holding the operands.
This instruction subtracts each byte of the second operand from the corresponding
the first operand and writes the results into the corresponding bytes of the destination.
saturates the results to the unsigned range 0 ≤
x ≤ 28 –1. The
Q flag is not affected even if this operation saturates.
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 affect the N, Z, C, V, Q, or GE 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.