SUBQ - M68K instruction reference

subqSubtract quick 
Subtracts an immediate value of 1 to 8 from the second operand.
Sizes .b .w .l, .w by default
Used in Length of a stringM68K assembly
Reverse a string in placeM68K assembly
Recursion: factorial and FibonacciM68K assembly
Binary searchM68K assembly
The snake gameM68K assembly
Flappy birdM68K assembly
 
XNZVC ●●●●●
● set from the result
Forms  subq ,   
Operands #imm An immediate from 1 to 8, for example #1. More
<ea> An operand using one of the instruction’s supported addressing modes, such as d0, (a0)+ or 4(a1). It may name a register, memory or an immediate value. More
The first operand value must be between 1 and 8. If the destination is an address register, it is always treated as a long, and the condition codes are not affected.
 move.l #$10, d0
subq.l #8, d0
subq.l #1, d0
; subq.w #9, d0 ; error! immediate must be 1-8