view fib.s68 @ 541:a59ac6b4b5b5

Get rid of the native stack option the 68K core. Trying to make it work with code that messes with the stack is not worth the trouble.
author Michael Pavone <pavone@retrodev.com>
date Sat, 15 Feb 2014 22:35:18 -0800
parents f664eeb55cb4
children 2455662378ed f7fe240a7da6
line wrap: on
line source

    dc.l $0, start
start:
	moveq #36, d0
	bsr fib
	illegal
fib:
	cmp.l #2, d0
	blt base
	subq.l #1, d0
	move.l d0, -(a7)
	bsr fib
	move.l (a7), d1
	exg d0, d1
	move.l d1, (a7)
	subq.l #1, d0
	bsr fib
	move.l (a7)+, d1
	add.l d1, d0
	rts
base:
	moveq #1, d0
	rts