xref: /openbmc/linux/arch/sparc/lib/udivdi3.S (revision f8739b71)
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
3
4This file is part of GNU CC.
5
6 */
7
8	.text
9	.align 4
10	.globl __udivdi3
11__udivdi3:
12	save %sp,-104,%sp
13	mov %i3,%o3
14	cmp %i2,0
15	bne .LL40
16	mov %i1,%i3
17	cmp %o3,%i0
18	bleu .LL41
19	mov %i3,%o1
20	! Inlined udiv_qrnnd
21	mov	32,%g1
22	subcc	%i0,%o3,%g0
231:	bcs	5f
24	 addxcc %o1,%o1,%o1	! shift n1n0 and a q-bit in lsb
25	sub	%i0,%o3,%i0	! this kills msb of n
26	addx	%i0,%i0,%i0	! so this cannot give carry
27	subcc	%g1,1,%g1
282:	bne	1b
29	 subcc	%i0,%o3,%g0
30	bcs	3f
31	 addxcc %o1,%o1,%o1	! shift n1n0 and a q-bit in lsb
32	b	3f
33	 sub	%i0,%o3,%i0	! this kills msb of n
344:	sub	%i0,%o3,%i0
355:	addxcc	%i0,%i0,%i0
36	bcc	2b
37	 subcc	%g1,1,%g1
38! Got carry from n.  Subtract next step to cancel this carry.
39	bne	4b
40	 addcc	%o1,%o1,%o1	! shift n1n0 and a 0-bit in lsb
41	sub	%i0,%o3,%i0
423:	xnor	%o1,0,%o1
43	! End of inline udiv_qrnnd
44	b .LL45
45	mov 0,%o2
46.LL41:
47	cmp %o3,0
48	bne .LL77
49	mov %i0,%o2
50	mov 1,%o0
51	mov 0,%o1
52	wr %g0, 0, %y
53	udiv %o0, %o1, %o0
54	mov %o0,%o3
55	mov %i0,%o2
56.LL77:
57	mov 0,%o4
58	! Inlined udiv_qrnnd
59	mov	32,%g1
60	subcc	%o4,%o3,%g0
611:	bcs	5f
62	 addxcc %o2,%o2,%o2	! shift n1n0 and a q-bit in lsb
63	sub	%o4,%o3,%o4	! this kills msb of n
64	addx	%o4,%o4,%o4	! so this cannot give carry
65	subcc	%g1,1,%g1
662:	bne	1b
67	 subcc	%o4,%o3,%g0
68	bcs	3f
69	 addxcc %o2,%o2,%o2	! shift n1n0 and a q-bit in lsb
70	b	3f
71	 sub	%o4,%o3,%o4	! this kills msb of n
724:	sub	%o4,%o3,%o4
735:	addxcc	%o4,%o4,%o4
74	bcc	2b
75	 subcc	%g1,1,%g1
76! Got carry from n.  Subtract next step to cancel this carry.
77	bne	4b
78	 addcc	%o2,%o2,%o2	! shift n1n0 and a 0-bit in lsb
79	sub	%o4,%o3,%o4
803:	xnor	%o2,0,%o2
81	! End of inline udiv_qrnnd
82	mov %o4,%i0
83	mov %i3,%o1
84	! Inlined udiv_qrnnd
85	mov	32,%g1
86	subcc	%i0,%o3,%g0
871:	bcs	5f
88	 addxcc %o1,%o1,%o1	! shift n1n0 and a q-bit in lsb
89	sub	%i0,%o3,%i0	! this kills msb of n
90	addx	%i0,%i0,%i0	! so this cannot give carry
91	subcc	%g1,1,%g1
922:	bne	1b
93	 subcc	%i0,%o3,%g0
94	bcs	3f
95	 addxcc %o1,%o1,%o1	! shift n1n0 and a q-bit in lsb
96	b	3f
97	 sub	%i0,%o3,%i0	! this kills msb of n
984:	sub	%i0,%o3,%i0
995:	addxcc	%i0,%i0,%i0
100	bcc	2b
101	 subcc	%g1,1,%g1
102! Got carry from n.  Subtract next step to cancel this carry.
103	bne	4b
104	 addcc	%o1,%o1,%o1	! shift n1n0 and a 0-bit in lsb
105	sub	%i0,%o3,%i0
1063:	xnor	%o1,0,%o1
107	! End of inline udiv_qrnnd
108	b .LL78
109	mov %o1,%l1
110.LL40:
111	cmp %i2,%i0
112	bleu .LL46
113	sethi %hi(65535),%o0
114	b .LL73
115	mov 0,%o1
116.LL46:
117	or %o0,%lo(65535),%o0
118	cmp %i2,%o0
119	bgu .LL53
120	mov %i2,%o1
121	cmp %i2,256
122	addx %g0,-1,%o0
123	b .LL59
124	and %o0,8,%o2
125.LL53:
126	sethi %hi(16777215),%o0
127	or %o0,%lo(16777215),%o0
128	cmp %o1,%o0
129	bgu .LL59
130	mov 24,%o2
131	mov 16,%o2
132.LL59:
133	srl %o1,%o2,%o1
134	sethi %hi(__clz_tab),%o0
135	or %o0,%lo(__clz_tab),%o0
136	ldub [%o1+%o0],%o0
137	add %o0,%o2,%o0
138	mov 32,%o1
139	subcc %o1,%o0,%o2
140	bne,a .LL67
141	mov 32,%o0
142	cmp %i0,%i2
143	bgu .LL69
144	cmp %i3,%o3
145	blu .LL73
146	mov 0,%o1
147.LL69:
148	b .LL73
149	mov 1,%o1
150.LL67:
151	sub %o0,%o2,%o0
152	sll %i2,%o2,%i2
153	srl %o3,%o0,%o1
154	or %i2,%o1,%i2
155	sll %o3,%o2,%o3
156	srl %i0,%o0,%o1
157	sll %i0,%o2,%i0
158	srl %i3,%o0,%o0
159	or %i0,%o0,%i0
160	sll %i3,%o2,%i3
161	mov %i0,%o5
162	mov %o1,%o4
163	! Inlined udiv_qrnnd
164	mov	32,%g1
165	subcc	%o4,%i2,%g0
1661:	bcs	5f
167	 addxcc %o5,%o5,%o5	! shift n1n0 and a q-bit in lsb
168	sub	%o4,%i2,%o4	! this kills msb of n
169	addx	%o4,%o4,%o4	! so this cannot give carry
170	subcc	%g1,1,%g1
1712:	bne	1b
172	 subcc	%o4,%i2,%g0
173	bcs	3f
174	 addxcc %o5,%o5,%o5	! shift n1n0 and a q-bit in lsb
175	b	3f
176	 sub	%o4,%i2,%o4	! this kills msb of n
1774:	sub	%o4,%i2,%o4
1785:	addxcc	%o4,%o4,%o4
179	bcc	2b
180	 subcc	%g1,1,%g1
181! Got carry from n.  Subtract next step to cancel this carry.
182	bne	4b
183	 addcc	%o5,%o5,%o5	! shift n1n0 and a 0-bit in lsb
184	sub	%o4,%i2,%o4
1853:	xnor	%o5,0,%o5
186	! End of inline udiv_qrnnd
187	mov %o4,%i0
188	mov %o5,%o1
189	! Inlined umul_ppmm
190	wr	%g0,%o1,%y	! SPARC has 0-3 delay insn after a wr
191	sra	%o3,31,%g2	! Do not move this insn
192	and	%o1,%g2,%g2	! Do not move this insn
193	andcc	%g0,0,%g1	! Do not move this insn
194	mulscc	%g1,%o3,%g1
195	mulscc	%g1,%o3,%g1
196	mulscc	%g1,%o3,%g1
197	mulscc	%g1,%o3,%g1
198	mulscc	%g1,%o3,%g1
199	mulscc	%g1,%o3,%g1
200	mulscc	%g1,%o3,%g1
201	mulscc	%g1,%o3,%g1
202	mulscc	%g1,%o3,%g1
203	mulscc	%g1,%o3,%g1
204	mulscc	%g1,%o3,%g1
205	mulscc	%g1,%o3,%g1
206	mulscc	%g1,%o3,%g1
207	mulscc	%g1,%o3,%g1
208	mulscc	%g1,%o3,%g1
209	mulscc	%g1,%o3,%g1
210	mulscc	%g1,%o3,%g1
211	mulscc	%g1,%o3,%g1
212	mulscc	%g1,%o3,%g1
213	mulscc	%g1,%o3,%g1
214	mulscc	%g1,%o3,%g1
215	mulscc	%g1,%o3,%g1
216	mulscc	%g1,%o3,%g1
217	mulscc	%g1,%o3,%g1
218	mulscc	%g1,%o3,%g1
219	mulscc	%g1,%o3,%g1
220	mulscc	%g1,%o3,%g1
221	mulscc	%g1,%o3,%g1
222	mulscc	%g1,%o3,%g1
223	mulscc	%g1,%o3,%g1
224	mulscc	%g1,%o3,%g1
225	mulscc	%g1,%o3,%g1
226	mulscc	%g1,0,%g1
227	add	%g1,%g2,%o0
228	rd	%y,%o2
229	cmp %o0,%i0
230	bgu,a .LL73
231	add %o1,-1,%o1
232	bne,a .LL45
233	mov 0,%o2
234	cmp %o2,%i3
235	bleu .LL45
236	mov 0,%o2
237	add %o1,-1,%o1
238.LL73:
239	mov 0,%o2
240.LL45:
241	mov %o1,%l1
242.LL78:
243	mov %o2,%l0
244	mov %l0,%i0
245	mov %l1,%i1
246	ret
247	restore
248