1/* Alpha  sub_n -- Subtract two limb vectors of the same length > 0 and
2 *		  store difference in a third limb vector.
3 *      Copyright (C) 1995, 1998,
4 *                    2001, 2002 Free Software Foundation, Inc.
5 *
6 * This file is part of Libgcrypt.
7 *
8 * Libgcrypt is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as
10 * published by the Free Software Foundation; either version 2.1 of
11 * the License, or (at your option) any later version.
12 *
13 * Libgcrypt is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
21 */
22
23
24/*******************
25 *  mpi_limb_t
26 *  _gcry_mpih_sub_n( mpi_ptr_t res_ptr,	(r16)
27 *		   mpi_ptr_t s1_ptr,	(r17)
28 *		   mpi_ptr_t s2_ptr,	(r18)
29 *		   mpi_size_t size)	(r19)
30 */
31
32	.set	noreorder
33	.set	noat
34.text
35	.align	3
36	.globl	_gcry_mpih_sub_n
37	.ent	_gcry_mpih_sub_n
38_gcry_mpih_sub_n:
39	.frame	$30,0,$26,0
40
41	ldq	$3,0($17)
42	ldq	$4,0($18)
43
44	subq	$19,1,$19
45	and	$19,4-1,$2	# number of limbs in first loop
46	bis	$31,$31,$0
47	beq	$2,.L0		# if multiple of 4 limbs, skip first loop
48
49	subq	$19,$2,$19
50
51.Loop0: subq	$2,1,$2
52	ldq	$5,8($17)
53	addq	$4,$0,$4
54	ldq	$6,8($18)
55	cmpult	$4,$0,$1
56	subq	$3,$4,$4
57	cmpult	$3,$4,$0
58	stq	$4,0($16)
59	or	$0,$1,$0
60
61	addq	$17,8,$17
62	addq	$18,8,$18
63	bis	$5,$5,$3
64	bis	$6,$6,$4
65	addq	$16,8,$16
66	bne	$2,.Loop0
67
68.L0:	beq	$19,.Lend
69
70	.align	3
71.Loop:	subq	$19,4,$19
72
73	ldq	$5,8($17)
74	addq	$4,$0,$4
75	ldq	$6,8($18)
76	cmpult	$4,$0,$1
77	subq	$3,$4,$4
78	cmpult	$3,$4,$0
79	stq	$4,0($16)
80	or	$0,$1,$0
81
82	ldq	$3,16($17)
83	addq	$6,$0,$6
84	ldq	$4,16($18)
85	cmpult	$6,$0,$1
86	subq	$5,$6,$6
87	cmpult	$5,$6,$0
88	stq	$6,8($16)
89	or	$0,$1,$0
90
91	ldq	$5,24($17)
92	addq	$4,$0,$4
93	ldq	$6,24($18)
94	cmpult	$4,$0,$1
95	subq	$3,$4,$4
96	cmpult	$3,$4,$0
97	stq	$4,16($16)
98	or	$0,$1,$0
99
100	ldq	$3,32($17)
101	addq	$6,$0,$6
102	ldq	$4,32($18)
103	cmpult	$6,$0,$1
104	subq	$5,$6,$6
105	cmpult	$5,$6,$0
106	stq	$6,24($16)
107	or	$0,$1,$0
108
109	addq	$17,32,$17
110	addq	$18,32,$18
111	addq	$16,32,$16
112	bne	$19,.Loop
113
114.Lend:	addq	$4,$0,$4
115	cmpult	$4,$0,$1
116	subq	$3,$4,$4
117	cmpult	$3,$4,$0
118	stq	$4,0($16)
119	or	$0,$1,$0
120	ret	$31,($26),1
121
122	.end	_gcry_mpih_sub_n
123
124
125