Signed saturating Double and Subtract.
is an optional condition code.
is the destination register.
are the registers holding the operands.
SAT(. It saturates the result to the signed range â€“231 â‰¤
Rm - SAT(
x â‰¤ 231â€“1. Saturation can occur on the doubling
operation, on the subtraction, or on both. If saturation occurs on the doubling but
not on the subtraction, the Q flag is set but the final result is unsaturated.
You cannot use PC for any operand.
You can use SP in ARM instructions but this is deprecated in ARMv6T2 and above. You cannot use SP in Thumb instructions.
If saturation occurs, this instruction sets the Q flag. To
read the state of the Q flag, use an
This ARM instruction is available in ARMv6 and above, and E variants of ARMv5T.
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.
QDSUBLT r9, r0, r1