Signed 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 byte of the first operand and writes the
results into the corresponding bytes of the destination. It saturates the
results to the signed range –27 ≤
27 –1. The Q flag is not affected even
if this operation saturates.
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 affect the N, Z, C, V, Q, or GE 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 ARMv7E-M implementation.
There is no 16-bit version of this instruction in T32.