.dec

.dec &(0x2)

; Load float value
.orb $(0x1)
.val @float_t(12.3)
.pull &(0x4)
​
; decrement 12.3 -> 11.3
.dec &(0x4)

; load int
.ldx &(0x1) <| $(0x22)
; decrement value 0x22 -> 0x21
.dec &(0x1)