1 dnl PowerPC 750 mpn_lshift -- mpn left shift.
3 dnl Copyright 2002, 2003 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')
28 C mp_limb_t mpn_lshift (mp_ptr dst, mp_srcptr src, mp_size_t size,
31 C This code is the same per-limb speed as mpn/powerpc32/lshift.asm, but
32 C smaller and saving about 30 or so cycles of overhead.
43 slwi r5, r5, 2 C 4*size
45 subfic r7, r6, 32 C 32-shift
46 add r4, r4, r5 C &src[size]
48 add r5, r3, r5 C &dst[size]
49 lwz r8, -4(r4) C src[size-1]
52 lwzu r9, -8(r4) C src[size-2]
54 srw r3, r8, r7 C return value
55 slw r8, r8, r6 C src[size-1] << shift
61 C r4 src, incrementing
62 C r5 dst, incrementing
65 C r8 src[i+1] << shift
78 C r8 src[i+1] << shift
103 slw r12, r9, r6 C src[0] << shift
106 stw r12, -8(r5) C dst[0]
108 stw r8, -4(r5) C dst[1]
126 stw r12, -8(r5) C dst[0]
128 stw r8, -4(r5) C dst[1]
138 srw r3, r8, r7 C return value
139 slw r8, r8, r6 C src[size-1] << shift
141 stw r8, -4(r5) C dst[0]