89 lines
2.4 KiB
NASM
89 lines
2.4 KiB
NASM
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; Copyright 1992, 1994, 1996, 1999, 2000, 2001, 2002 Free Software
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; Foundation, Inc.
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;
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; This file is part of the GNU MP Library.
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;
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; The GNU MP Library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU Lesser General Public License as
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; published by the Free Software Foundation; either version 2.1 of the
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; License, or (at your option) any later version.
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;
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; The GNU MP Library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; Lesser General Public License for more details.
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;
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; You should have received a copy of the GNU Lesser General Public
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; License along with the GNU MP Library; see the file COPYING.LIB. If
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; not, write to the Free Software Foundation, Inc., 59 Temple Place -
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; Suite 330, Boston, MA 02111-1307, USA.
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;
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; Translation of AT&T syntax code by Brian Gladman
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%include "x86i.inc"
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%define PARAM_SHIFT esp+frame+16
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%define PARAM_SIZE esp+frame+12
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%define PARAM_SRC esp+frame+8
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%define PARAM_DST esp+frame+4
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%assign frame frame+12
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section .text
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global ___gmpn_rshift
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%ifdef DLL
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export ___gmpn_rshift
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%endif
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align 8
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___gmpn_rshift:
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push edi
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push esi
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push ebx
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mov edi,[PARAM_DST]
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mov esi,[PARAM_SRC]
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mov edx,[PARAM_SIZE]
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mov ecx,[PARAM_SHIFT]
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lea edi,[-4+edi+edx*4]
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lea esi,[esi+edx*4]
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neg edx
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mov ebx,[esi+edx*4] ; read least significant limb
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xor eax,eax
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shrd eax,ebx,cl
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inc edx
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jz Lend
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push eax ; push carry limb onto stack
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test dl,1
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jnz L1 ; enter Lop in the middle
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mov eax,ebx
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align 8
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Lop:
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mov ebx,[esi+edx*4] ; load next higher limb
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shrd eax,ebx,cl
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mov [edi+edx*4],eax ; store it
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inc edx
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L1:
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mov eax,[esi+edx*4]
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shrd ebx,eax,cl
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mov [edi+edx*4],ebx
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inc edx
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jnz Lop
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shr eax,cl ; compute most significant limb
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mov [edi],eax ; store it
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pop eax ; pop carry limb
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pop ebx
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pop esi
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pop edi
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ret
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Lend:
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shr ebx,cl ; compute most significant limb
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mov [edi],ebx ; store it
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pop ebx
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pop esi
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pop edi
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ret
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end
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