1/* mips3 mpih-mul1.S -- Multiply a limb vector with a limb and store
2 *			the result in 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_mul_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_mul_1
36	.ent	_gcry_mpih_mul_1
37_gcry_mpih_mul_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:	mflo	$10
57	mfhi	$9
58	daddiu	$5,$5,8
59	daddu	$10,$10,$2	# add old carry limb to low product limb
60	dmultu	$8,$7
61	ld	$8,0($5)	# load new s1 limb as early as possible
62	daddiu	$6,$6,-1	# decrement loop counter
63	sltu	$2,$10,$2	# carry from previous addition -> $2
64	sd	$10,0($4)
65	daddiu	$4,$4,8
66	bne	$6,$0,Loop
67	 daddu	$2,$9,$2	# add high product limb and carry from addition
68
69/* # cool down phase 1 */
70$LC1:	mflo	$10
71	mfhi	$9
72	daddu	$10,$10,$2
73	sltu	$2,$10,$2
74	dmultu	$8,$7
75	sd	$10,0($4)
76	daddiu	$4,$4,8
77	daddu	$2,$9,$2	# add high product limb and carry from addition
78
79/* # cool down phase 0 */
80$LC0:	mflo	$10
81	mfhi	$9
82	daddu	$10,$10,$2
83	sltu	$2,$10,$2
84	sd	$10,0($4)
85	j	$31
86	daddu	$2,$9,$2	# add high product limb and carry from addition
87
88	.end	_gcry_mpih_mul_1
89
90