1/* MIPS3 __mpn_rshift --
2 *
3 * Copyright (C) 1995-2021 Free Software Foundation, Inc.
4 *
5 * This file is part of the GNU MP Library.
6 *
7 * The GNU MP Library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published by
9 * the Free Software Foundation; either version 2.1 of the License, or (at your
10 * option) any later version.
11 *
12 * The GNU MP Library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
15 * License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with the GNU MP Library.  If not, see
19 * <https://www.gnu.org/licenses/>.
20 */
21
22#include <sysdep.h>
23#include <sys/asm.h>
24
25/* INPUT PARAMETERS
26 * res_ptr	$4
27 * src_ptr	$5
28 * size		$6
29 * cnt		$7
30 */
31
32#ifdef __PIC__
33	.option pic2
34#endif
35ENTRY (__mpn_rshift)
36#ifdef __PIC__
37	SETUP_GP /* ??? unused */
38#endif
39	.set	noreorder
40	.set	nomacro
41
42	ld	$10,0($5)	# load first limb
43	dsubu	$13,$0,$7
44	daddiu	$6,$6,-1
45	and	$9,$6,4-1	# number of limbs in first loop
46	beq	$9,$0,L(L0)	# if multiple of 4 limbs, skip first loop
47	dsll	$2,$10,$13	# compute function result
48
49	dsubu	$6,$6,$9
50
51L(Loop0):	ld	$3,8($5)
52	daddiu	$4,$4,8
53	daddiu	$5,$5,8
54	daddiu	$9,$9,-1
55	dsrl	$11,$10,$7
56	dsll	$12,$3,$13
57	move	$10,$3
58	or	$8,$11,$12
59	bne	$9,$0,L(Loop0)
60	sd	$8,-8($4)
61
62L(L0):	beq	$6,$0,L(Lend)
63	nop
64
65L(Loop):	ld	$3,8($5)
66	daddiu	$4,$4,32
67	daddiu	$6,$6,-4
68	dsrl	$11,$10,$7
69	dsll	$12,$3,$13
70
71	ld	$10,16($5)
72	dsrl	$14,$3,$7
73	or	$8,$11,$12
74	sd	$8,-32($4)
75	dsll	$9,$10,$13
76
77	ld	$3,24($5)
78	dsrl	$11,$10,$7
79	or	$8,$14,$9
80	sd	$8,-24($4)
81	dsll	$12,$3,$13
82
83	ld	$10,32($5)
84	dsrl	$14,$3,$7
85	or	$8,$11,$12
86	sd	$8,-16($4)
87	dsll	$9,$10,$13
88
89	daddiu	$5,$5,32
90	or	$8,$14,$9
91	bgtz	$6,L(Loop)
92	sd	$8,-8($4)
93
94L(Lend):	dsrl	$8,$10,$7
95	j	$31
96	sd	$8,0($4)
97END (__mpn_rshift)
98