1 dnl PowerPC-32 mpn_addlsh1_n -- rp[] = up[] + (vp[] << 1)
3 dnl Copyright 2003, 2005, 2007 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/.
20 include(`../config.m4')
27 C 744x,745x (G4+): 5.0
48 PROLOGUE(mpn_addlsh1_n)
49 mtctr r6 C copy n in ctr
50 addic r31, r31, 0 C clear cy
52 lwz v0, 0(vp) C load v limb
53 lwz u0, 0(up) C load u limb
54 addi up, up, -4 C update up
55 addi rp, rp, -4 C update rp
57 bdz L(end) C If done, skip loop
60 lwz v1, 4(vp) C load v limb
61 adde s1, s1, u0 C add limbs with cy, set cy
62 srwi s0, v0, 31 C shift down previous v limb
63 stw s1, 4(rp) C store result limb
64 lwzu u0, 8(up) C load u limb and update up
65 rlwimi s0, v1, 1, 0,30 C left shift v limb and merge with prev v limb
67 bdz L(exit) C decrement ctr and exit if done
69 lwzu v0, 8(vp) C load v limb and update vp
70 adde s0, s0, u0 C add limbs with cy, set cy
71 srwi s1, v1, 31 C shift down previous v limb
72 stwu s0, 8(rp) C store result limb and update rp
73 lwz u0, 4(up) C load u limb
74 rlwimi s1, v0, 1, 0,30 C left shift v limb and merge with prev v limb
76 bdnz L(loop) C decrement ctr and loop back
78 L(end): adde r7, s1, u0
80 stw r7, 4(rp) C store last result limb
86 stw r7, 8(rp) C store last result limb