1 dnl x86 mpn_lshift -- mpn left shift.
3 dnl Copyright 1992, 1994, 1996, 1999, 2000, 2001, 2002 Free Software
6 dnl This file is part of the GNU MP Library.
8 dnl The GNU MP Library is free software; you can redistribute it and/or
9 dnl modify it under the terms of the GNU Lesser General Public License as
10 dnl published by the Free Software Foundation; either version 3 of the
11 dnl License, or (at your option) any later version.
13 dnl The GNU MP Library is distributed in the hope that it will be useful,
14 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
15 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 dnl Lesser General Public License for more details.
18 dnl You should have received a copy of the GNU Lesser General Public License
19 dnl along with the GNU MP Library. If not, see http://www.gnu.org/licenses/.
21 include(`../config.m4')
33 C mp_limb_t mpn_lshift (mp_ptr dst, mp_srcptr src, mp_size_t size,
36 defframe(PARAM_SHIFT,16)
37 defframe(PARAM_SIZE, 12)
38 defframe(PARAM_SRC, 8)
39 defframe(PARAM_DST, 4)
55 subl $4,%esi C adjust src
57 movl (%esi,%edx,4),%ebx C read most significant limb
59 shldl( %cl, %ebx, %eax) C compute carry limb
62 pushl %eax C push carry limb onto stack
64 jnz L(1) C enter loop in the middle
68 L(oop): movl (%esi,%edx,4),%ebx C load next lower limb
69 shldl( %cl, %ebx, %eax) C compute result limb
70 movl %eax,(%edi,%edx,4) C store it
72 L(1): movl (%esi,%edx,4),%eax
73 shldl( %cl, %eax, %ebx)
74 movl %ebx,(%edi,%edx,4)
78 shll %cl,%eax C compute least significant limb
79 movl %eax,(%edi) C store it
81 popl %eax C pop carry limb
88 L(end): shll %cl,%ebx C compute least significant limb
89 movl %ebx,(%edi) C store it