Sign extend two bytes.
is an optional condition code.
is the destination register.
is the register holding the value to extend.
is one of:
Rmis rotated right 8 bits.
Rmis rotated right 16 bits.
Rmis rotated right 24 bits.
rotationis omitted, no rotation is performed.
SXTB16 extends two 8-bit values to two 16-bit values. It does this by:
Rotating the value from
Rmright by 0, 8, 16 or 24 bits.
Extracting bits[23:16] and bits[7:0] from the value obtained.
Sign extending to 16 bits each.
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 change the 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.