1 | /* Shift a limb right, low level routine. |
2 | Copyright (C) 1995-2024 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 | |
27 | ENTRY (__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 | |
35 | L(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 | |
48 | L(1): srw r0,r11,r6 |
49 | stw r0,4(r7) |
50 | blr |
51 | |
52 | L(2): srw r0,r10,r6 |
53 | stw r0,4(r7) |
54 | blr |
55 | END (__mpn_rshift) |
56 | |