1 ; 29000 __gmpn_rshift --
3 ; Copyright 1992, 1994, 2000 Free Software Foundation, Inc.
5 ; This file is part of the GNU MP Library.
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 3 of the License, or (at your
10 ; option) any later version.
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.
17 ; You should have received a copy of the GNU Lesser General Public License
18 ; along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
27 ; We use the loadm/storem instructions and operate on chunks of 8
28 ; limbs/per iteration, until less than 8 limbs remain.
33 .global ___gmpn_rshift
40 sll gr96,gr119,gr116 ; return value
41 sub lr4,lr4,1 ; actual loop count is SIZE - 1
43 srl gr117,lr4,3 ; chuck count = (actual count) / 8
48 sub gr117,gr117,2 ; count for jmpfdec
50 ; Main loop working 8 limbs/iteration.
55 extract gr98,gr100,gr119
56 extract gr99,gr101,gr100
57 extract gr100,gr102,gr101
58 extract gr101,gr103,gr102
59 extract gr102,gr104,gr103
60 extract gr103,gr105,gr104
61 extract gr104,gr106,gr105
62 extract gr105,gr107,gr106
70 ; Code for the last up-to-7 limbs.
73 Ltail: cpeq gr118,lr4,0
75 sub lr4,lr4,2 ; count for jmpfdec
77 Loop2: load 0,0,gr100,lr3
79 extract gr117,gr100,gr119
85 Lend: srl gr117,gr119,lr5