1/* mips3    rshift
2 *
3 *      Copyright (C) 1995, 1998, 2000
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 * mpi_limb_t
25 * _gcry_mpih_rshift( mpi_ptr_t wp,	($4)
26 *		   mpi_ptr_t up,	($5)
27 *		   mpi_size_t usize,	($6)
28 *		   unsigned cnt)	($7)
29 */
30
31	.text
32	.align	2
33	.globl	_gcry_mpih_rshift
34	.ent	_gcry_mpih_rshift
35_gcry_mpih_rshift:
36	.set	noreorder
37	.set	nomacro
38
39	ld	$10,0($5)	# load first limb
40	dsubu	$13,$0,$7
41	daddiu	$6,$6,-1
42	and	$9,$6,4-1	# number of limbs in first loop
43	beq	$9,$0,.L0	# if multiple of 4 limbs, skip first loop
44	 dsll	$2,$10,$13	# compute function result
45
46	dsubu	$6,$6,$9
47
48.Loop0: ld	$3,8($5)
49	daddiu	$4,$4,8
50	daddiu	$5,$5,8
51	daddiu	$9,$9,-1
52	dsrl	$11,$10,$7
53	dsll	$12,$3,$13
54	move	$10,$3
55	or	$8,$11,$12
56	bne	$9,$0,.Loop0
57	 sd	$8,-8($4)
58
59.L0:	beq	$6,$0,.Lend
60	 nop
61
62.Loop:	ld	$3,8($5)
63	daddiu	$4,$4,32
64	daddiu	$6,$6,-4
65	dsrl	$11,$10,$7
66	dsll	$12,$3,$13
67
68	ld	$10,16($5)
69	dsrl	$14,$3,$7
70	or	$8,$11,$12
71	sd	$8,-32($4)
72	dsll	$9,$10,$13
73
74	ld	$3,24($5)
75	dsrl	$11,$10,$7
76	or	$8,$14,$9
77	sd	$8,-24($4)
78	dsll	$12,$3,$13
79
80	ld	$10,32($5)
81	dsrl	$14,$3,$7
82	or	$8,$11,$12
83	sd	$8,-16($4)
84	dsll	$9,$10,$13
85
86	daddiu	$5,$5,32
87	or	$8,$14,$9
88	bgtz	$6,.Loop
89	 sd	$8,-8($4)
90
91.Lend:	dsrl	$8,$10,$7
92	j	$31
93	sd	$8,0($4)
94	.end	_gcry_mpih_rshift
95
96