1 dnl IBM POWER mpn_rshift -- Shift a number right.
3 dnl Copyright 1992, 1994, 1999, 2000, 2001 Free Software Foundation, Inc.
5 dnl This file is part of the GNU MP Library.
7 dnl The GNU MP Library is free software; you can redistribute it and/or modify
8 dnl it under the terms of the GNU Lesser General Public License as published
9 dnl by the Free Software Foundation; either version 3 of the License, or (at
10 dnl your option) any later version.
12 dnl The GNU MP Library is distributed in the hope that it will be useful, but
13 dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
15 dnl License for more details.
17 dnl You should have received a copy of the GNU Lesser General Public License
18 dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
27 include(`../config.m4')
32 mtctr 5 C put limb count in CTR loop register
33 l 0,0(4) C read least significant limb
34 ai 9,3,-4 C adjust res_ptr since it's offset in the stu:s
35 sle 3,0,8 C compute carry limb, and init MQ register
36 bdz Lend2 C if just one limb, skip loop
37 lu 0,4(4) C read 2:nd least significant limb
38 sleq 7,0,8 C compute least significant limb of result
39 bdz Lend C if just two limb, skip loop
40 Loop: lu 0,4(4) C load next higher limb
41 stu 7,4(9) C store previous result during read latency
42 sleq 7,0,8 C compute result limb
43 bdn Loop C loop back until CTR is zero
44 Lend: stu 7,4(9) C store 2:nd most significant limb
45 Lend2: sre 7,0,6 C compute most significant limb