1/* MIPS3   addmul_1 -- Multiply a limb vector with a single limb and
2 *		       add the product to a second limb vector.
3 *
4 *      Copyright (C) 1992, 1994, 1995, 1998, 2000
5 *                    2001, 2002 Free Software Foundation, Inc.
6 *
7 * This file is part of Libgcrypt.
8 *
9 * Libgcrypt is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation; either version 2.1 of
12 * the License, or (at your option) any later version.
13 *
14 * Libgcrypt is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 * GNU Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
22 */
23
24
25/*******************
26 * mpi_limb_t
27 * _gcry_mpih_addmul_1( mpi_ptr_t res_ptr,      (r4)
28 *		     mpi_ptr_t s1_ptr,	     (r5)
29 *		     mpi_size_t s1_size,     (r6)
30 *		     mpi_limb_t s2_limb)     (r7)
31 */
32
33	.text
34	.align	4
35	.globl	_gcry_mpih_addmul_1
36	.ent	_gcry_mpih_addmul_1
37_gcry_mpih_addmul_1:
38	.set	noreorder
39	.set	nomacro
40
41/* # warm up phase 0 */
42	ld	$8,0($5)
43
44/* # warm up phase 1 */
45	daddiu	$5,$5,8
46	dmultu	$8,$7
47
48	daddiu	$6,$6,-1
49	beq	$6,$0,$LC0
50	 move	$2,$0		# zero cy2
51
52	daddiu	$6,$6,-1
53	beq	$6,$0,$LC1
54	ld	$8,0($5)	# load new s1 limb as early as possible
55
56Loop:	ld	$10,0($4)
57	mflo	$3
58	mfhi	$9
59	daddiu	$5,$5,8
60	daddu	$3,$3,$2	# add old carry limb to low product limb
61	dmultu	$8,$7
62	ld	$8,0($5)	# load new s1 limb as early as possible
63	daddiu	$6,$6,-1	# decrement loop counter
64	sltu	$2,$3,$2	# carry from previous addition -> $2
65	daddu	$3,$10,$3
66	sltu	$10,$3,$10
67	daddu	$2,$2,$10
68	sd	$3,0($4)
69	daddiu	$4,$4,8
70	bne	$6,$0,Loop
71	 daddu	$2,$9,$2	# add high product limb and carry from addition
72
73/* # cool down phase 1 */
74$LC1:	ld	$10,0($4)
75	mflo	$3
76	mfhi	$9
77	daddu	$3,$3,$2
78	sltu	$2,$3,$2
79	dmultu	$8,$7
80	daddu	$3,$10,$3
81	sltu	$10,$3,$10
82	daddu	$2,$2,$10
83	sd	$3,0($4)
84	daddiu	$4,$4,8
85	daddu	$2,$9,$2	# add high product limb and carry from addition
86
87/* # cool down phase 0 */
88$LC0:	ld	$10,0($4)
89	mflo	$3
90	mfhi	$9
91	daddu	$3,$3,$2
92	sltu	$2,$3,$2
93	daddu	$3,$10,$3
94	sltu	$10,$3,$10
95	daddu	$2,$2,$10
96	sd	$3,0($4)
97	j	$31
98	daddu	$2,$9,$2	# add high product limb and carry from addition
99
100	.end	_gcry_mpih_addmul_1
101
102