loopw
Loop with cx as the counter
Decrements cx by one and jumps to the short target if the counter is non-zero; unavailable in 64-bit mode.
8086 and laterNot available in 64-bit mode
CFPFAFZFSFDFOF –––––––
- Changes no flag
Forms
loopw
Operands
imm8- A branch target, written as a label or address. NASM calculates the displacement from the end of the instruction. The displacement must fit a signed byte,
-128to127.
It leaves flags unchanged. A zero initial counter wraps to its maximum value when decremented.
The w suffix selects the 16-bit counter and 16-bit address size. This form is unavailable in 64-bit mode. The suffix chooses the counter width, not the branch displacement width.
Write a target label or address. NASM calculates a signed 8-bit displacement from the end of the instruction (−128 through 127 bytes). There is no longer near encoding.