1/* mips3    lshift
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_lshift( 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_lshift
34	.ent	_gcry_mpih_lshift
35_gcry_mpih_lshift:
36	.set	noreorder
37	.set	nomacro
38
39	dsll	$2,$6,3
40	daddu	$5,$5,$2	# make r5 point at end of src
41	ld	$10,-8($5)	# load first limb
42	dsubu	$13,$0,$7
43	daddu	$4,$4,$2	# make r4 point at end of res
44	daddiu	$6,$6,-1
45	and	$9,$6,4-1	# number of limbs in first loop
46	beq	$9,$0,.L0	# if multiple of 4 limbs, skip first loop
47	 dsrl	$2,$10,$13	# compute function result
48
49	dsubu	$6,$6,$9
50
51.Loop0: ld	$3,-16($5)
52	daddiu	$4,$4,-8
53	daddiu	$5,$5,-8
54	daddiu	$9,$9,-1
55	dsll	$11,$10,$7
56	dsrl	$12,$3,$13
57	move	$10,$3
58	or	$8,$11,$12
59	bne	$9,$0,.Loop0
60	 sd	$8,0($4)
61
62.L0:	beq	$6,$0,.Lend
63	 nop
64
65.Loop:	ld	$3,-16($5)
66	daddiu	$4,$4,-32
67	daddiu	$6,$6,-4
68	dsll	$11,$10,$7
69	dsrl	$12,$3,$13
70
71	ld	$10,-24($5)
72	dsll	$14,$3,$7
73	or	$8,$11,$12
74	sd	$8,24($4)
75	dsrl	$9,$10,$13
76
77	ld	$3,-32($5)
78	dsll	$11,$10,$7
79	or	$8,$14,$9
80	sd	$8,16($4)
81	dsrl	$12,$3,$13
82
83	ld	$10,-40($5)
84	dsll	$14,$3,$7
85	or	$8,$11,$12
86	sd	$8,8($4)
87	dsrl	$9,$10,$13
88
89	daddiu	$5,$5,-32
90	or	$8,$14,$9
91	bgtz	$6,.Loop
92	 sd	$8,0($4)
93
94.Lend:	dsll	$8,$10,$7
95	j	$31
96	sd	$8,-8($4)
97	.end	_gcry_mpih_lshift
98