; mark used nodes and pointers in argument parts and link backward pointers


	lea	o0,heap_size_33
	lwz	d7,0(o0)

	lea	o0,caf_list
	slwi	d7,d7,5
	lwz	d0,0(o0)
	
	stwu	a4,-4(sp)
	li	g3,128

	cmpwi	0,d0,0
	beq	end_mark_cafs

mark_cafs_lp:
	lwz	d1,0(d0)
	lwz	o5,-4(d0)
	addi	a2,d0,4
	slwi	d0,d1,2
	add	a4,a2,d0

	bl	mark_stack_nodes

	addic.	d0,o5,0
	bne	mark_cafs_lp

end_mark_cafs:

	lea	o0,stack_p
	lwz	a4,0(sp)
	lwz	a2,0(o0)
	addi	sp,sp,4

	bl	mark_stack_nodes

 if MEASURE_GC
	stwu	o4,-4(sp)
	bl	.add_mark_compact_garbage_collect_time

	lwz	o4,0(sp)
	li	g3,128
	baddi	sp,4
 endif

	b	compact_heap

mark_stack_nodes3:
	stw	a0,-4(a2)
	b	mark_stack_nodes

mark_stack_nodes2:
	lwz	g1,0(a0)
	addi	d0,a2,1-4
	stw	g1,-4(a2)
	stw	d0,0(a0)

mark_stack_nodes:
	cmpw	0,a4,a2
	beq	end_mark_nodes

	lwz	a0,0(a2)
	addi	a2,a2,4

	sub	d0,a0,d6
 if SHARE_CHAR_INT
	cmplw	0,d0,d7
	bge-	mark_stack_nodes
 endif

	srwi	o0,d0,5
	lbzx	o1,o4,o0
	rlwinm	o2,d0,32-2,29,31
	rlwnm.	r0,o1,o2,24,24
	bne-	mark_stack_nodes2
		
	li	d3,0
	li	d5,1

mark_arguments:
	lwz	d0,0-NODE_POINTER_OFFSET(a0)
	srw	o3,g3,o2

	or	o1,o1,o3

	andi.	r0,d0,2
	lha	d2,-2(d0)

	stbx	o1,o4,o0

	cmpwi	6,d2,0
	beq	mark_lazy_node

	beq	6,mark_hnf_0

	cmplwi	0,d2,256
	addi	a0,a0,4
	bge	mark_record

	subic.	d2,d2,2
	beq	mark_hnf_2
	blt	mark_hnf_1

mark_hnf_3:
	lwz	a1,4-NODE_POINTER_OFFSET(a0)
mark_hnf_3_:
	sub	d0,a1,d6
	srwi	o0,d0,5
	lbzx	o1,o4,o0
	rlwinm	o2,d0,32-2,29,31
	srw	o3,g3,o2
	and.	r0,o1,o3
	bne	shared_argument_part

	or	o1,o1,o3
	stbx	o1,o4,o0

no_shared_argument_part:
	lwz	o0,0-NODE_POINTER_OFFSET(a0)
	or	d3,d3,d5
	ori	o0,o0,2
	stw	o0,0-NODE_POINTER_OFFSET(a0)
	stwu	d3,4-NODE_POINTER_OFFSET(a0)

	lwz	o0,0-NODE_POINTER_OFFSET(a1)
	slwi	d2,d2,2
	ori	o0,o0,1
	stw	o0,0-NODE_POINTER_OFFSET(a1)

	lwzux	d2,a1,d2
	li	d5,0
	stw	a0,0-NODE_POINTER_OFFSET(a1)
	mr	d3,a1
	mr	a0,d2
	b	mark_node

shared_argument_part:
	cmplw	0,a1,a0
	bgt	mark_hnf_1

	lwz	o0,0-NODE_POINTER_OFFSET(a1)
	addi	d0,a0,4+2+1
	stw	d0,0-NODE_POINTER_OFFSET(a1)
	stw	o0,4-NODE_POINTER_OFFSET(a0)
	b	mark_hnf_1

mark_lazy_node_1:
; remove if no selectors:
	bne	mark_selector_node_1
mark_hnf_1:
	lwz	d2,0-NODE_POINTER_OFFSET(a0)
	or	d3,d3,d5
	stw	d3,0-NODE_POINTER_OFFSET(a0)
	mr	d3,a0
	li	d5,2
	mr	a0,d2
	b	mark_node

mark_selector_node_1:
	baddicc	d2,3
	lwz	a1,0-NODE_POINTER_OFFSET(a0)
	beq	mark_indirection_node

	addic.	d2,d2,1
	sub	o2,a1,d6
	ble	mark_record_selector_node_1

	srwi	d2,o2,5
	lbzx	g1,o4,d2
	rlwinm	g2,o2,32-2,29,31
	rlwnm.	r0,g1,g2,24,24
	bne	mark_hnf_1

	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	andi.	r0,d2,2
	beq	mark_hnf_1

	lha	g1,-2(d2)
	cmplwi	0,g1,2
	ble	small_tuple_or_record

large_tuple_or_record:	
	lwz	d1,8-NODE_POINTER_OFFSET(a1)

	sub	o2,d1,d6
	srwi	d2,o2,5
	lbzx	g1,o4,d2
	rlwinm	g2,o2,32-2,29,31
	rlwnm.	r0,g1,g2,24,24
	bne	mark_hnf_1

small_tuple_or_record:
 if LINUX
	lwz	g1,-8(d0)
	mflr	r0
 else
	lha	g1,-6(d0)
	mflr	r0
	lwzx	g1,rtoc,g1
 endif
	andc	o1,o1,o3

	lwz	g1,4(g1)
	subi	d2,a0,4

	mtlr	g1
	stbx	o1,o4,o0
	mr	a0,a1
	stwu	r0,-4(sp)
	blrl
	mtlr	r0

	lea	g1,__indirection
	stw	a0,4-NODE_POINTER_OFFSET(d2)
	stw	g1,0-NODE_POINTER_OFFSET(d2)
	b	mark_node

mark_record_selector_node_1:
	srwi	d2,o2,5
	lbzx	g1,o4,d2
	rlwinm	g2,o2,32-2,29,31
	beq	mark_strict_record_selector_node_1

	rlwnm.	r0,g1,g2,24,24
	bne	mark_hnf_1

	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	andi.	r0,d2,2
	beq	mark_hnf_1

	lha	g1,-2(d2)
	cmplwi	0,g1,258
	ble	small_tuple_or_record
	b	large_tuple_or_record

mark_strict_record_selector_node_1:
	rlwnm.	r0,g1,g2,24,24
	bne	mark_hnf_1

	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	andi.	r0,d2,2
	beq	mark_hnf_1

	lha	g1,-2(d2)
	cmplwi	0,g1,258
	ble	select_from_small_record

	lwz	d1,8-NODE_POINTER_OFFSET(a1)
	sub	o2,d1,d6

	srwi	d2,o2,5
	lbzx	g1,o4,d2
	rlwinm	g2,o2,32-2,29,31
	rlwnm.	r0,g1,g2,24,24
	bne	mark_hnf_1

select_from_small_record:
 if LINUX
	lwz	g1,-8(d0)
	mflr	r0
 else
	lha	g1,-6(d0)
	mflr	r0
	lwzx	g1,rtoc,g1
 endif
	subi	a0,a0,4
	lwz	g1,4(g1)

	mtlr	g1
	stwu	r0,-4(sp)
	blrl
	mtlr	r0

	b	mark_next_node

mark_indirection_node:
	andc	o1,o1,o3
	stbx	o1,o4,o0

	mr	a0,a1
	b	mark_node

mark_hnf_2:
	lwz	o0,0-NODE_POINTER_OFFSET(a0)
	or	d3,d3,d5
	ori	o0,o0,2
	stw	o0,0-NODE_POINTER_OFFSET(a0)
	lwzu	d2,4-NODE_POINTER_OFFSET(a0)
	stw	d3,0-NODE_POINTER_OFFSET(a0)
	mr	d3,a0
	li	d5,0
	mr	a0,d2

mark_node:
	sub	d0,a0,d6
 if SHARE_CHAR_INT
	cmplw	0,d0,d7
	bge-	mark_next_node_after_static
 endif
	srwi	o0,d0,5
	lbzx	o1,o4,o0
	rlwinm	o2,d0,32-2,29,31
	rlwnm.	r0,o1,o2,24,24
	beq+	mark_arguments

mark_next_node:
	cmpwi	0,d5,0
	bne	mark_parent

	lwzu	d2,-4-NODE_POINTER_OFFSET(d3)
	lwz	o0,4-NODE_POINTER_OFFSET(d3)
	andi.	d5,d2,3

	cmpwi	0,d5,3
	beq	argument_part_cycle1

	stw	o0,0-NODE_POINTER_OFFSET(d3)

c_argument_part_cycle1:
	cmplw	0,a0,d3
	bgt	no_reverse_1

	lwz	o0,0-NODE_POINTER_OFFSET(a0)
	addi	d0,d3,4+1
	stw	o0,4-NODE_POINTER_OFFSET(d3)
	stw	d0,0-NODE_POINTER_OFFSET(a0)
	clrrwi	a0,d2,2
	b	mark_node

no_reverse_1:
	stw	a0,4-NODE_POINTER_OFFSET(d3)
	clrrwi	a0,d2,2
	b	mark_node

mark_lazy_node:
	beq	6,mark_next_node

	bsubicc	d2,1
	baddi	a0,4
	ble	mark_lazy_node_1

 	cmplwi	0,d2,255
	bge	mark_closure_with_unboxed_arguments

mark_closure_with_unboxed_arguments_:
	lwz	o0,0-NODE_POINTER_OFFSET(a0)
	slwi	d2,d2,2
	ori	o0,o0,2
	stw	o0,0(a0)

	lwzux	d2,a0,d2
	or	d3,d3,d5
	stw	d3,0-NODE_POINTER_OFFSET(a0)
	mr	d3,a0
	li	d5,0
	mr	a0,d2
	b	mark_node

mark_closure_with_unboxed_arguments:
;	baddi	d2,1
	srwi	d0,d2,8
	bandic	d2,255
;	bsub	d2,d0
	bsubc	d2,d0
;	bsubicc	d2,1
	bgt	mark_closure_with_unboxed_arguments_
	beq	mark_hnf_1
	bsubi	a0,4
	b	mark_next_node	

mark_hnf_0:
 if SHARE_CHAR_INT
	cmpw	d0,int_reg
	bne	no_int_3

	lwz	d2,4-NODE_POINTER_OFFSET(a0)
	cmplwi	0,d2,33
	bge	mark_next_node

	andc	o1,o1,o3
	stbx	o1,o4,o0

	lea	a0,small_integers
	slwi	d2,d2,3
	add	a0,a0,d2
	b	mark_next_node_after_static

no_int_3:
	cmplw	d0,char_reg
	bne	no_char_3

	andc	o1,o1,o3
	stbx	o1,o4,o0

	lbz	d2,7-NODE_POINTER_OFFSET(a0)
	lea	a0,static_characters
	slwi	d2,d2,3
	add	a0,a0,d2
	b	mark_next_node_after_static

no_char_3:
	blt	no_normal_hnf_0

	subi	a0,d0,2-ZERO_ARITY_DESCRIPTOR_OFFSET

	andc	o1,o1,o3
	stbx	o1,o4,o0
	b	mark_next_node_after_static
		
no_normal_hnf_0:
 endif

	lea	o0,__ARRAY__2
	cmplw	0,d0,o0
	bne+	mark_next_node
	b	mark_array

mark_record:
	subic.	d2,d2,258
	beq	mark_record_2
	blt	mark_record_1

mark_record_3:
	lhz	d2,-2+2(d0)
	lwz	a1,4-NODE_POINTER_OFFSET(a0)
	subic.	d2,d2,1
	blt	mark_record_3_bb
	
	beq	mark_record_3_ab

	subic.	d2,d2,1
	beq	mark_record_3_aab

	b	mark_hnf_3_

mark_record_3_bb:
	subi	a0,a0,4

	sub	d0,a1,d6
	setmbit	o4,d0,d1,o0,o1,o2,2

	cmplw	a1,a0
	bgt	mark_next_node

	srwi.	o0,o0,1

	lwz	o2,0-NODE_POINTER_OFFSET(a1)
	addi	d0,a0,8+2+1
	stw	o2,8-NODE_POINTER_OFFSET(a0)
	stw	d0,0-NODE_POINTER_OFFSET(a1)

	bne+	not_next_byte_1

	addi	d1,d1,1
	lbzx	o1,o4,d1
	li	o0,128
not_next_byte_1:
	and.	r0,o1,o0
	beq+	not_yet_linked_bb
		
	sub	d0,a0,d6
	addi	d0,d0,8
	setmbit	o4,d0,d1,o0,o1,o2,2
	b	mark_next_node

not_yet_linked_bb:
	or	o1,o1,o0
	stbx	o1,o4,d1
	b	mark_next_node

mark_record_3_ab:
	sub	d0,a1,d6
	setmbit	o4,d0,d1,o0,o1,o2,2

	cmplw	0,a1,a0
	bgt	mark_hnf_1

	srwi.	o0,o0,1

	lwz	o2,0-NODE_POINTER_OFFSET(a1)
	addi	d0,a0,4+2+1
	stw	o2,4-NODE_POINTER_OFFSET(a0)
	stw	d0,0-NODE_POINTER_OFFSET(a1)

	bne+	not_next_byte_2

	addi	d1,d1,1
	lbzx	o1,o4,d1
	li	o0,128
not_next_byte_2:
	and.	r0,o1,o0
	beq+	not_yet_linked_ab

	sub	d0,a0,d6
	addi	d0,d0,4
	setmbit	o4,d0,d1,o0,o1,o2,2
	b	mark_hnf_1
		
not_yet_linked_ab:
	or	o1,o1,o0
	stbx	o1,o4,d1
	b	mark_hnf_1

mark_record_3_aab:
	sub	d0,a1,d6

	tstmbit	o4,d0,d1,o0,o1,o2,2
	bne	shared_argument_part

	srw	o0,g3,o2
	or	o1,o1,o0	
	stbx	o1,o4,d1

	lwz	o0,0-NODE_POINTER_OFFSET(a0)
	or	d3,d3,d5
	ori	o0,o0,2
	stw	o0,0-NODE_POINTER_OFFSET(a0)
	stwu	d3,4-NODE_POINTER_OFFSET(a0)
		
	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	li	d5,1
	stw	a0,0-NODE_POINTER_OFFSET(a1)
	mr	d3,a1
	mr	a0,d2
	b	mark_node

mark_record_2:
	lhz	g1,-2+2(d0)
	cmplwi	g1,1
	bgt	mark_hnf_2
	beq	mark_hnf_1

	subi	a0,a0,4
	b	mark_next_node

mark_record_1:
	lhz	g1,-2+2(d0)
	tst	g1
	bne	mark_hnf_1

	subi	a0,a0,4
	b	mark_next_node

mark_array:
	lwz	d1,8-NODE_POINTER_OFFSET(a0)
	tst	d1
	beq	mark_lazy_array

	lhz	d0,-2(d1)
	tst	d0
	beq	mark_b_record_array

	lhz	d1,-2+2(d1)
	tst	d1
	beq	mark_b_record_array

	subi	d0,d0,256
	cmpw	0,d0,d1
	beq	mark_a_record_array

mark_ab_record_array:
	mr	o2,d2
	mr	o3,d3
	stw	d5,-4(sp)

	lwz	d2,4-NODE_POINTER_OFFSET(a0)
	addi	a0,a0,8
	stw	a0,-8(sp)

	slwi	d2,d2,2
	mullw	a1,d2,d0

	sub	d0,d0,d1
	addi	a0,a0,4
	add	a1,a1,a0
	
	mflr	r0
	stw	r0,-12(sp)
	bl	reorder
	lwz	r0,-12(sp)

	lwz	a0,-8(sp)
	mtlr	r0

	lwz	d0,-4(a0)
	mullw	d0,d0,d1
		
	lwz	d5,-4(sp)
	mr	d3,o3
	mr	d2,o2
	b	mark_lr_array

mark_b_record_array:
	sub	d0,a0,d6
	addi	d0,d0,4
	setmbit	o4,d0,d1,o0,o1,o2,2
	b	mark_next_node

mark_a_record_array:
	lwz	d0,4-NODE_POINTER_OFFSET(a0)
	addi	a0,a0,8
	mullw	d0,d0,d1
	b	mark_lr_array

mark_lazy_array:
	lwz	d0,4-NODE_POINTER_OFFSET(a0)
	addi	a0,a0,8
mark_lr_array:
	sub	d1,a0,d6
	srwi	d1,d1,2
	add	d1,d1,d0
	setmbit	o4,d1,d2,o0,o1,o2,0

	cmplwi	0,d0,1
	ble	mark_array_length_0_1

	mr	a1,a0
	slwi	d0,d0,2
	add	a0,a0,d0

	lwz	d2,0-NODE_POINTER_OFFSET(a0)
	lwz	o0,0-NODE_POINTER_OFFSET(a1)
	stw	d2,0-NODE_POINTER_OFFSET(a1)
	stw	o0,0-NODE_POINTER_OFFSET(a0)

	lwzu	d2,-4-NODE_POINTER_OFFSET(a0)
	lwzu	o0,-4-NODE_POINTER_OFFSET(a1)
	addi	d2,d2,2
	stw	o0,0-NODE_POINTER_OFFSET(a0)
	stw	d2,0-NODE_POINTER_OFFSET(a1)

	lwzu	d2,-4-NODE_POINTER_OFFSET(a0)
	or	d3,d3,d5
	stw	d3,0-NODE_POINTER_OFFSET(a0)
	mr	d3,a0
	li	d5,0
	mr	a0,d2
	b	mark_node

mark_array_length_0_1:
	subi	a0,a0,8
	blt	mark_next_node
		
	lwz	d1,12-NODE_POINTER_OFFSET(a0)
	lwz	o0,8-NODE_POINTER_OFFSET(a0)
	lwz	o1,4-NODE_POINTER_OFFSET(a0)
	stw	o0,12-NODE_POINTER_OFFSET(a0)
	stw	o1,8-NODE_POINTER_OFFSET(a0)
	stwu	d1,4-NODE_POINTER_OFFSET(a0)
	b	mark_hnf_1


mark_parent:
	tst	d3
	beq	mark_stack_nodes2

	subic.	d5,d5,1
	beq	argument_part_parent

	cmplw	a0,d3
	lwz	d2,0-NODE_POINTER_OFFSET(d3)
	bgt	no_reverse_2

	mr	a1,a0
	addi	d0,d3,1
	lwz	a0,0-NODE_POINTER_OFFSET(a1)
	stw	d0,0-NODE_POINTER_OFFSET(a1)

no_reverse_2:
	stw	a0,0-NODE_POINTER_OFFSET(d3)
	subi	a0,d3,4
	andi.	d5,d2,3
	clrrwi	d3,d2,2
	b	mark_next_node
		
argument_part_parent:
	mr	a1,d3
	mr	d3,a0

	lwz	d2,0-NODE_POINTER_OFFSET(a1)

	mr	a0,a1

skip_upward_pointers:
	andi.	d0,d2,3
	cmpwi	0,d0,3
	bne	no_upward_pointer

	clrrwi	a1,d2,2
	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	b	skip_upward_pointers

no_upward_pointer:
	cmplw	0,d3,a0
	bgt	no_reverse_3

	mr	a6,d3
	lwz	d3,0-NODE_POINTER_OFFSET(d3)
	addi	d0,a0,1
	stw	d0,0-NODE_POINTER_OFFSET(a6)
		
no_reverse_3:
	stw	d3,0-NODE_POINTER_OFFSET(a1)

	clrrwi	d3,d2,2

	lwzu	d2,-4-NODE_POINTER_OFFSET(d3)

	cmplw	6,a0,d3

	lwz	o0,4-NODE_POINTER_OFFSET(d3)
	andi.	d5,d2,3
	stw	o0,0-NODE_POINTER_OFFSET(d3)

	bgt	6,no_reverse_4

	lwz	o0,0-NODE_POINTER_OFFSET(a0)
	stw	o0,4-NODE_POINTER_OFFSET(d3)
	addi	d0,d3,4+2+1
	stw	d0,0-NODE_POINTER_OFFSET(a0)
	clrrwi	a0,d2,2
	b	mark_node

no_reverse_4:
	stw	a0,4-NODE_POINTER_OFFSET(d3)
	clrrwi	a0,d2,2
	b	mark_node

argument_part_cycle1:
	mr	d1,a1

skip_pointer_list1:
	clrrwi	a1,d2,2
	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	andi.	d5,d2,3
	cmpwi	0,d5,3
	beq	skip_pointer_list1

	stw	o0,0-NODE_POINTER_OFFSET(a1)
	mr	a1,d1
	b	c_argument_part_cycle1

 if SHARE_CHAR_INT
mark_next_node_after_static:
	cmpwi	0,d5,0
	bne	mark_parent_after_static

	lwzu	d2,-4-NODE_POINTER_OFFSET(d3)
	lwz	o0,4-NODE_POINTER_OFFSET(d3)
	andi.	d5,d2,3
		
	cmpwi	0,d5,3
	beq	argument_part_cycle2
		
	stw	o0,0-NODE_POINTER_OFFSET(d3)

c_argument_part_cycle2:
	stw	a0,4-NODE_POINTER_OFFSET(d3)
	clrrwi	a0,d2,2
	b	mark_node

mark_parent_after_static:
	cmpwi	0,d3,0
	beq	mark_stack_nodes3

	subic.	d5,d5,1
	beq	argument_part_parent_after_static

	lwz	d2,0-NODE_POINTER_OFFSET(d3)
	stw	a0,0-NODE_POINTER_OFFSET(d3)
	subi	a0,d3,4
	andi.	d5,d2,3
	clrrwi	d3,d2,2
	b	mark_next_node
		
argument_part_parent_after_static:
	mr	a1,d3
	mr	d3,a0

	lwz	d2,0-NODE_POINTER_OFFSET(a1)

	mr	a0,a1

skip_upward_pointers_2:
	andi.	d0,d2,3
	cmpwi	0,d0,3
	bne	no_reverse_3

	clrrwi	a1,d2,2
	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	b	skip_upward_pointers_2

argument_part_cycle2:
	mr	d1,a1

skip_pointer_list2:
	clrrwi	a1,d2,2
	lwz	d2,0-NODE_POINTER_OFFSET(a1)
	andi.	d5,d2,3
	cmpwi	0,d5,3
	beq	skip_pointer_list2

	stw	o0,0-NODE_POINTER_OFFSET(a1)
	mr	a1,d1
	b	c_argument_part_cycle2
 endif

end_mark_nodes:
	addi	a2,a2,4
	blr


; compact the heap

compact_heap:

 if FINALIZERS
	lea	a0,finalizer_list
	lea	a1,free_finalizer_list

	lwz	a2,0(a0)
determine_free_finalizers_after_compact1:
	lea	o0,__Nil_m8
	cmplw	o0,a2
	beq	end_finalizers_after_compact1

	sub	d1,a2,d6
	rlwinm	o0,d1,32-5,5,29
	lwzx	o1,o4,o0
	rlwinm	d1,d1,32-2,27,31
	rlwnm.	r0,o1,d1,0,0
	beq	finalizer_not_used_after_compact1

	lwz	d0,0(a2)
	mr	a3,a2
	b	finalizer_find_descriptor

finalizer_find_descriptor_lp:
	clrrwi	d0,d0,2
	mr	a3,d0
	lwz	d0,0(d0)
finalizer_find_descriptor:
	andi.	r0,d0,1
	bne	finalizer_find_descriptor_lp

	lea	o0,e____system__kFinalizerGCTemp_2
	stw	o0,0(a3)

	cmplw	a2,a0
	bgt	finalizer_no_reverse

	lwz	d0,0(a2)
	addi	a3,a0,1
	stw	a3,0(a2)
	stw	d0,0(a0)

finalizer_no_reverse:
	addi	a0,a2,4
	lwz	a2,4(a2)
	b	determine_free_finalizers_after_compact1

finalizer_not_used_after_compact1:
	lea	o0,e____system__kFinalizerGCTemp_2
	stw	o0,0(a2)

	stw	a2,0(a1)
	addi	a1,a2,4

	lwz	a2,4(a2)
	stw	a2,0(a0)
	b	determine_free_finalizers_after_compact1

end_finalizers_after_compact1:
	stw	a2,0(a1)

	lea	o1,finalizer_list
	lwz	a0,0(o1)
	lea	o0,__Nil_m8
	cmplw	o0,a0
	beq	finalizer_list_empty
	andi.	r0,a0,3
	bne	finalizer_list_already_reversed
	lwz	d0,0(a0)
	addi	o0,o1,1
	stw	o0,0(a0)
	stw	d0,0(o1)
finalizer_list_already_reversed:
finalizer_list_empty:

	lea	a2,free_finalizer_list
	lea	o0,__Nil_m8
	lwz	o1,0(a2)
	cmplw	o0,o1
	beq	free_finalizer_list_empty

	stwu	a4,-4(sp)
	addi	a4,a2,4
	bl	mark_stack_nodes
	lwz	a4,0(sp)
	addi	sp,sp,4

free_finalizer_list_empty:
 endif

	lea	o0,heap_size_33
	lwz	d5,0(o0)
	slwi	d2,d5,5

 if SHARE_CHAR_INT
	add	d2,d2,d6
 endif

	addi	d5,d5,3
	srwi.	d5,d5,2
		
	mr	a2,o4
	mr	a6,d6
	li	d4,0
	
	beq	end_compact_heap

	mtctr	d5
skip_zeros_2:
	lwz	d4,0(a2)
	baddi	a2,4
	cmpwi	0,d4,0
	bne	end_skip_zeros
find_non_zero_long_2:
	bdnz	skip_zeros_2

	b	end_compact_heap

end_skip_zeros:
	sub	d7,a2,o4
	subi	d7,d7,4
	slwi	d7,d7,5
	add	d7,d7,d6

skip_zero_bits:
	cntlzw	d1,d4
	cmpwi	0,d1,32
	beq-	find_non_zero_long_2

	addi	d1,d1,1
	slw	d4,d4,d1
	slwi	d1,d1,2
	add	d7,d7,d1
		
	lwz	d0,-4(d7)
	mr	a0,d7

	andi.	r0,d0,2
	clrrwi	d0,d0,2
	beq+	begin_update_list_2

	lwz	d3,-8(d0)
	mr	a1,d0
	andi.	r0,d3,1
	beq	end_list_2
find_descriptor_2:
	clrrwi	a1,d3,2
	lwz	d3,0(a1)
	andi.	r0,d3,1
	bne	find_descriptor_2
end_list_2:
	lhz	d1,-2(d3)

	cmplwi	0,d1,256
	blt	no_record_arguments

	lhz	d3,-2+2(d3)
	subic.	d3,d3,2
	bge	copy_record_arguments_aa
	
	subi	d1,d1,256+3

copy_record_arguments_all_b:
	mr	g2,d1

update_up_list_1r:
	mr	a1,d0
	sub	d0,d0,d6

	tstmbit	o4,d0,d1,o0,o1,o2,2
	beq	copy_argument_part_1r

	lwz	d0,0(a1)
	stw	a6,0(a1)
	subi	d0,d0,3
	b	update_up_list_1r

copy_argument_part_1r:
	lwz	d0,0(a1)
	stw	a6,0(a1)
	stw	d0,0(a6)
	addi	a6,a6,4

	mr	d1,g2

copy_b_record_argument_part_arguments:
	lwz	o0,0(a0)

	subic.	d1,d1,1

	addi	a0,a0,4
	stw	o0,0(a6)
	addi	a6,a6,4
	bge	copy_b_record_argument_part_arguments

	sub	o0,a2,o4
	slwi	o0,o0,5
	add	o0,o0,d6

	cmpw	0,o0,d7
	addi	d7,d7,4
	slwi	d4,d4,1
	bne	skip_zero_bits

	bdz	end_compact_heap

	lwz	d4,0(a2)
	lis	o1,0x8000
	andc	d4,d4,o1
	b	skip_zeros_2+4

copy_record_arguments_aa:
	subi	d1,d1,256+2
	sub	d1,d1,d3
	mr	g2,d1

update_up_list_2r:
	mr	a1,d0
	lwz	d0,0(a1)
	andi.	d1,d0,3
	subic.	d1,d1,3
	stw	a6,0(a1)
	bne	copy_argument_part_2r

	subi	d0,d0,3
	b	update_up_list_2r

copy_argument_part_2r:
	cmplw	0,d0,a0
	blt	copy_record_argument_2
 if SHARE_CHAR_INT
	cmplw	0,d0,d2
	bge	copy_record_argument_2
 endif
	mr	a1,d0
	lwz	d0,0(a1)
	addi	d1,a6,1
	stw	d1,0(a1)
copy_record_argument_2:
	stw	d0,0(a6)
	addi	a6,a6,4

	subic.	d3,d3,1
	blt	no_pointers_in_record
copy_record_pointers:
	lwz	a1,0(a0)
	addi	a0,a0,4
	cmplw	0,a1,a0
	blt	copy_record_pointers_2
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	copy_record_pointers_2
 endif
	lwz	d1,0(a1)
	addi	d0,a6,1
	stw	d0,0(a1)
	mr	a1,d1
copy_record_pointers_2:
	stw	a1,0(a6)
	subic.	d3,d3,1
	addi	a6,a6,4
	bge	copy_record_pointers
		
no_pointers_in_record:
	cmpwi	0,g2,0
	subi	d1,g2,1
	beq	no_non_pointers_in_record

copy_non_pointers_in_record:
	lwz	o0,0(a0)
	addi	a0,a0,4
	stw	o0,0(a6)
#	subi.	d2,d2,1
	subic.	d1,d1,1
	addi	a6,a6,4
	bge	copy_non_pointers_in_record

no_non_pointers_in_record:
	b	skip_zero_bits

no_record_arguments:
	subi	d1,d1,3
update_up_list_2:
	mr	a1,d0
	lwz	d0,0(a1)
	andi.	d3,d0,3
	cmpwi	0,d3,3
	bne	copy_argument_part_2

	stw	a6,0(a1)
	clrrwi	d0,d0,2
	b	update_up_list_2

copy_argument_part_2:
	stw	a6,0(a1)

	cmplw	0,d0,a0
	addi	a6,a6,4
	blt	copy_arguments_1

 if SHARE_CHAR_INT
	cmplw	0,d0,d2
	bge	copy_arguments_1
 endif
	mr	a1,d0
	lwz	d0,0(a1)
	addi	d3,a6,1-4
	stw	d3,0(a1)
copy_arguments_1:
	stw	d0,-4(a6)

copy_argument_part_arguments:
	lwz	a1,0(a0)
	addi	a0,a0,4
	cmplw	0,a1,a0
	blt	copy_arguments_2
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	copy_arguments_2
 endif
	ori	d0,a6,1
	lwz	d3,0(a1)
	stw	d0,0(a1)
	mr	a1,d3

copy_arguments_2:
	stw	a1,0(a6)
	subic.	d1,d1,1
	addi	a6,a6,4
	bge	copy_argument_part_arguments

	b	skip_zero_bits

update_list_2:
	stw	a6,0(a1)
begin_update_list_2:
	mr	a1,d0
	lwz	d0,0(a1)
update_list__2:
	andi.	r0,d0,1
	beq	end_update_list_2
	andi.	r0,d0,2
	clrrwi	d0,d0,2
	beq	update_list_2
	mr	a1,d0
	lwz	d0,0(a1)
	b	update_list__2

end_update_list_2:
	stw	a6,0(a1)

	andi.	r0,d0,2
	stw	d0,0(a6)
	beq	move_lazy_node

	lhz	d1,-2(d0)
	baddi	a6,4
	cmpwi	0,d1,0
	beq	move_hnf_0

	cmplwi	0,d1,256
	bge	move_record

	subic.	d1,d1,2
	blt	move_hnf_1
	beq	move_hnf_2

move_hnf_3:
	lwz	a1,0(a0)
	addi	a0,a0,4
move_hnf_3_:
	cmplw	0,a1,a0
	blt	copy_hnf_3_1
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	copy_hnf_3_1
 endif
	ori	d0,a6,1
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
copy_hnf_3_1:
	stw	a1,0(a6)
		
	lwz	a1,0(a0)
	addi	a0,a0,4
	cmplw	0,a1,a0
	blt	copy_hnf_3_2
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	copy_hnf_3_2
 endif
	addi	d0,a6,4+2+1
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
copy_hnf_3_2:
	stw	a1,4(a6)
	addi	a6,a6,8
	b	skip_zero_bits

move_hnf_2:
	lwz	a1,0(a0)
	addi	a0,a0,4
	cmplw	0,a1,a0
	blt	copy_hnf_2_1
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	copy_hnf_2_1
 endif
	ori	d0,a6,1
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
copy_hnf_2_1:
	stw	a1,0(a6)
		
	lwz	a1,0(a0)
	addi	a0,a0,4
	cmplw	0,a1,a0
	blt	copy_hnf_2_2
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	copy_hnf_2_2
 endif
	addi	d0,a6,4+1
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
copy_hnf_2_2:
	stw	a1,4(a6)
	addi	a6,a6,8
	b	skip_zero_bits

move_hnf_1:
	lwz	a1,0(a0)
	addi	a0,a0,4
	cmplw	0,a1,a0
	blt	move_hnf_1_
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	move_hnf_1_
 endif
	ori	d0,a6,1
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
move_hnf_1_:
	stw	a1,0(a6)
	addi	a6,a6,4
	b	skip_zero_bits

move_real_or_file:
	lwz	o0,0(a0)
	lwz	o1,4(a0)
	stw	o0,0(a6)
	stw	o1,4(a6)
	addi	a6,a6,8
	b	skip_zero_bits

move_int_bool_or_char:
	lwz	o0,0(a0)
	addi	a6,a6,4
	stw	o0,-4(a6)
copy_normal_hnf_0:
	b	skip_zero_bits

move_hnf_0:
	cmplw	0,d0,int_reg
	blt	move_real_file_string_or_array

	cmplw	0,d0,char_reg
	ble	move_int_bool_or_char

;	b,a	copy_normal_hnf_0
	b	skip_zero_bits

move_real_file_string_or_array:
	lea	o0,__STRING__2
	cmplw	0,d0,o0
	bgt	move_real_or_file

	bne	move_array

	lwz	d0,0(a0)
	addi	d0,d0,3
	srwi	d0,d0,2

cp_s_arg_lp3:
	lwz	o0,0(a0)
	subic.	d0,d0,1
	stw	o0,0(a6)
	blt	end_cp_s_lp3

cp_s_lp3:
	lwzu	o0,4(a0)
	subic.	d0,d0,1
	stwu	o0,4(a6)
	bge	cp_s_lp3

end_cp_s_lp3:
	addi	a6,a6,4
	b	skip_zero_bits

move_record:
	bsubicc	d1,258
	blt	move_record_1
	beq	move_record_2

move_record_3:
	lhz	d1,-2+2(d0)

	lwz	a1,0(a0)

	bsubicc	d1,1	

	baddi	a0,4

	bgt	move_hnf_3_

	blt	move_record_3_1b

move_record_3_1a:
	cmplw	0,a1,a0
	blt	move_record_3_1b
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	move_record_3_1b
 endif
	addi	d0,a6,1
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
move_record_3_1b:
	stw	a1,0(a6)
	addi	a6,a6,4

	lwz	a1,0(a0)
	addi	a0,a0,4
	cmplw	0,a1,a0
	blt	move_record_3_2
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	move_record_3_2
 endif
	sub	d0,a1,d6
	addi	d0,d0,4

	tstmbit	o4,d0,d1,o0,o1,o2,2
	beq	not_linked_record_argument_part_3_b

	sub	d0,a6,d6
	setmbit	o4,d0,d1,o0,o1,o2,2
	b	linked_record_argument_part_3_b

not_linked_record_argument_part_3_b:
	srw	o0,g3,o2
	or	o1,o1,o0	
	stbx	o1,o4,d1

	sub	d0,a6,d6
	clrmbit	o4,d0,d1,o0,o1,o2,2

linked_record_argument_part_3_b:
	lwz	d1,0(a1)
	addi	d0,a6,2+1
	stw	d0,0(a1)
	mr	a1,d1
move_record_3_2:
	stw	a1,0(a6)
	addi	a6,a6,4

	sub	o0,a2,o4
	slwi	o0,o0,5
	add	o0,o0,d6

	addi	d7,d7,4
	cmpw	0,d7,o0
	
	addi	d7,d7,4
	slwi	d4,d4,2
	blt	skip_zero_bits
	bgt	bits_in_next_long

	lis	o1,0x80000000>>16
	b	one_bit_in_next_long

bits_in_next_long:
	lis	o1,0xc0000000>>16
one_bit_in_next_long:
	bdz	end_compact_heap

	lwz	d4,0(a2)
	andc	d4,d4,o1
	b	skip_zeros_2+4

move_record_2:
	lhz	g1,-2+2(d0)
	cmplwi	0,g1,1
	bgt	move_hnf_2	
	blt	move_real_or_file

move_record_2_ab:
	lwz	a1,0(a0)
	lwzu	o0,4(a0)
	cmplw	0,a1,a0
	blt	move_record_2_1
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	addi	d0,a6,1
	bge	move_record_2_1
 endif
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
move_record_2_1:
	stw	a1,0(a6)
	stw	o0,4(a6)
	addi	a6,a6,8
	b	skip_zero_bits

move_record_1:
	lhz	g1,-2+2(d0)
	cmpwi	0,g1,0
	bne	move_hnf_1

	b	move_int_bool_or_char

skip_zeros_2_a:
	lwz	d4,0(a2)
	bdz-	out_of_memory_4
	cmpwi	0,d4,0
	addi	a2,a2,4
	beq	skip_zeros_2_a

end_skip_zeros_a:
	sub	d7,a2,o4
	subi	d7,d7,4
	slwi	d7,d7,5
	add	d7,d7,d6

move_array:
skip_zero_bits_a:
	cntlzw	d1,d4
	cmpwi	0,d1,32
	beq	skip_zeros_2_a

	slw	d4,d4,d1
	slwi	d4,d4,1

	slwi	d1,d1,2
	add	d7,d7,d1

	cmpw	0,d7,a0
	mr	d1,d7
	addi	d7,d7,4
	bne	move_a_array

move_b_array:
	lwz	a1,0(a0)
	lwzu	d1,4(a0)
	stw	a1,0(a6)
	lhz	d0,-2(d1)

	addi	a6,a6,4

	cmpwi	0,d0,0
	beq	move_strict_basic_array

	subi	d1,d0,256
	mullw	d0,a1,d1
	b	cp_s_arg_lp3

move_strict_basic_array:
	cmpw	0,d1,int_reg
	mr	d0,a1
	beq	cp_s_arg_lp3

	cmpw	0,d1,bool_reg
	beq	move_bool_array

	add	d0,d0,d0
	b	cp_s_arg_lp3

move_bool_array:
	addi	d0,d0,3
	srwi	d0,d0,2
	b	cp_s_arg_lp3

move_a_array:
	mr	a1,d1
	sub	d1,d1,a0
	srwi	d1,d1,2
	subic.	d1,d1,1
	blt	skip_zero_bits
 if 0
		cmpwi	d1,1
		ble	move_a_array_size_0_1
 endif

; first swap second last element of array and second last element of header
	lwz	o0,0(a0)
	lwz	d0,-4(a1)
	stw	o0,-4(a1)
	stw	d0,0(a6)

; then swap last element of array and last element of header
; this also works for length 0 and 1 !

	lwz	d0,0(a1)
	lwz	o0,4(a0)
	stw	o0,0(a1)
	addi	a0,a0,8
 if 0
	c_move_array_size_1:
 endif

	cmpwi	0,d0,0
	stw	d0,4(a6)
	addi	a6,a6,8
	beq	st_move_array_lp
		
	lhz	d3,-2+2(d0)
	lhz	d0,-2(d0)
	subi	d0,d0,256
	cmpw	0,d0,d3
	beq	st_move_array_lp

move_array_ab:
	mr	o2,d4
	mr	o3,d5

	mr	g2,d2
	stw	a0,-4(sp)

	lwz	d2,-8(a6)
	mr	d1,d3

	mr	d3,d0
	slwi	d2,d2,2
	mullw	a1,d2,d3

	sub	d0,d0,d1
	add	a1,a1,a0

	mflr	r0
	stw	r0,-8(sp)

	bl	reorder

	lwz	r0,-8(sp)
	lwz	d3,-8(a6)
	mtlr	r0

	lwz	a0,-4(sp)
	mr	d2,g2
	subi	d1,d1,1
	subi	d0,d0,1
	b	st_move_array_lp_ab

move_array_ab_lp1:
	mr	d4,d1
move_array_ab_a_elements:
	lwz	d5,0(a0)
	addi	a0,a0,4
	cmplw	0,d5,a0
	blt	move_array_element_ab
 if SHARE_CHAR_INT
	cmplw	0,d5,d2
	bge	move_array_element_ab
 endif
	mr	a1,d5
	lwz	d5,0(a1)
	addi	o0,a6,1
	stw	o0,0(a1)
move_array_element_ab:
	subic.	d4,d4,1
	stw	d5,0(a6)
	addi	a6,a6,4
	bge	move_array_ab_a_elements

	mr	d4,d0
move_array_ab_b_elements:
	lwz	o0,0(a0)
	subic.	d4,d4,1
	addi	a0,a0,4
	stw	o0,0(a6)
	addi	a6,a6,4
	bge	move_array_ab_b_elements
st_move_array_lp_ab:
	subic.	d3,d3,1
	bge	move_array_ab_lp1

	mr	d5,o3
	mr	d4,o2
	b	skip_zero_bits

st_move_array_lp:
	subic.	d1,d1,1
	subi	a6,a6,4
	bge+	move_lazy_node_arguments
	addi	a6,a6,4
	b	skip_zero_bits
 if 0
	move_a_array_size_0_1:
		lwz	o0,0(a0)
		lwz	d0,4(a0)
		blt	move_array_size_0
	
		stw	d0,0(a6)
		lwz	d0,8(a0)
		stwu	o0,8(a0)
		b	c_move_array_size_1
	
	move_array_size_0:
		stw	o0,0(a6)
		stw	d0,4(a6)
		addi	a6,a6,8
		b	skip_zero_bits
 endif

move_lazy_node:
	lha	d1,-2(d0)
	mr	a1,d0
	cmpwi	0,d1,0
	beq	move_lazy_node_0

	bsubicc	d1,1
	ble	move_lazy_node_1

	cmplwi	0,d1,256
	bge	move_closure_with_unboxed_arguments

move_lazy_node_arguments:
	lwz	a1,0(a0)
	baddi	a0,4
	cmplw	0,a1,a0
	blt	move_lazy_node_arguments_
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	move_lazy_node_arguments_
 endif
	lwz	o0,0(a1)

	bsubicc	d1,1

	stwu	o0,4(a6)
	addi	d0,a6,1
	stw	d0,0(a1)
	bge	move_lazy_node_arguments

	baddi	a6,4
	b	skip_zero_bits

move_lazy_node_arguments_:
	bsubicc	d1,1
	stwu	a1,4(a6)
	bge	move_lazy_node_arguments
		
	baddi	a6,4
	b	skip_zero_bits

move_lazy_node_1:
	lwz	a1,0(a0)
	baddi	a0,4
	cmplw	0,a1,a0
	blt	move_lazy_node_1_
 if SHARE_CHAR_INT
	cmplw	0,a1,d2
	bge	move_lazy_node_1_
 endif
	addi	d0,a6,4+1
	lwz	d1,0(a1)
	stw	d0,0(a1)
	mr	a1,d1
move_lazy_node_1_:
	stw	a1,4(a6)
move_lazy_node_0:
	baddi	a6,12
	b	skip_zero_bits

move_closure_with_unboxed_arguments:
	baddi	d1,1
	srwi	d0,d1,8
	beq	move_closure_with_unboxed_arguments_1
	bandic	d1,255
	bsubc	d1,d0
	beq	copy_non_pointers_of_closure

move_pointers_in_closure:
	lwz	a1,0(a0)
	baddi	a0,4
	cmplw	6,a1,a0

	bsubicc	d1,1

	blt	6,move_pointers_in_closure_
 if SHARE_CHAR_INT
	cmplw	6,a1,d2
	bge	6,move_pointers_in_closure_
 endif
	lwz	o0,0(a1)
	addi	o1,a6,4+1
	stw	o1,0(a1)
	mr	a1,o0

move_pointers_in_closure_:
	stwu	a1,4(a6)
	bne	move_pointers_in_closure

copy_non_pointers_of_closure:
	bsubicc	d0,1

	lwz	d1,0(a0)
	baddi	a0,4
	stwu	d1,4(a6)
	
	bne	copy_non_pointers_of_closure

	baddi	a6,4
	b	skip_zero_bits

move_closure_with_unboxed_arguments_1:
	lwz	d0,0(a0)
	baddi	a6,12
	stw	d0,4-12(a6)
	b	skip_zero_bits	

end_compact_heap:

 if FINALIZERS
	lea	a0,finalizer_list
	lwz	a0,0(a0)

restore_finalizer_descriptors:
	lea	o0,__Nil_m8
	cmplw	o0,a0
	beq	end_restore_finalizer_descriptors

	lea	o0,e____system__kFinalizer_2
	stw	o0,0(a0)
	lwz	a0,4(a0)
	b	restore_finalizer_descriptors

end_restore_finalizer_descriptors:
 endif