1/* Shift a limb right, low level routine.
2   Copyright (C) 1995-2022 Free Software Foundation, Inc.
3   This file is part of the GNU C Library.
4
5   The GNU C Library is free software; you can redistribute it and/or
6   modify it under the terms of the GNU Lesser General Public
7   License as published by the Free Software Foundation; either
8   version 2.1 of the License, or (at your option) any later version.
9
10   The GNU C Library is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public
16   License along with the GNU C Library; if not, see
17   <https://www.gnu.org/licenses/>.  */
18
19#include <sysdep.h>
20
21/* INPUT PARAMETERS
22   res_ptr	r3
23   s1_ptr	r4
24   size		r5
25   cnt		r6  */
26
27ENTRY (__mpn_rshift)
28	mtctr	r5		# copy size into CTR
29	addi	r7,r3,-4	# move adjusted res_ptr to free return reg
30	subfic	r8,r6,32
31	lwz	r11,0(r4)	# load first s1 limb
32	slw	r3,r11,r8	# compute function return value
33	bdz	L(1)
34
35L(0):	lwzu	r10,4(r4)
36	srw	r9,r11,r6
37	slw	r12,r10,r8
38	or	r9,r9,r12
39	stwu	r9,4(r7)
40	bdz	L(2)
41	lwzu	r11,4(r4)
42	srw	r9,r10,r6
43	slw	r12,r11,r8
44	or	r9,r9,r12
45	stwu	r9,4(r7)
46	bdnz	L(0)
47
48L(1):	srw	r0,r11,r6
49	stw	r0,4(r7)
50	blr
51
52L(2):	srw	r0,r10,r6
53	stw	r0,4(r7)
54	blr
55END (__mpn_rshift)
56