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115 lines
2.8 KiB
NASM
115 lines
2.8 KiB
NASM
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; i80586 sub_n -- Sub two limb vectors of the same length > 0 and store
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; sum in a third limb vector.
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;
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; Copyright (C) 1992, 1994, 1995, 1996, 1998,
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; 2001 Free Software Foundation, Inc.
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;
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; This file is part of GnuPG.
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;
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; GnuPG is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; GnuPG 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
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program; if not, write to the Free Software
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; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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;
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; Modified versions of the GPG i586 assembler for use with NASM. This
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; file is part of a native port of Gnu PG for use with Microsoft Visual
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; Studio .net. Ported by Brian Gladman <brg@gladman.uk.net> March 2002.
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global _mpihelp_sub_n
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section .text
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align 8
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_mpihelp_sub_n:
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push edi
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push esi
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push ebx
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push ebp
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mov edi,[20+esp]
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mov esi,[24+esp]
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mov ebp,[28+esp]
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mov ecx,[32+esp]
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mov ebx,[ebp]
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dec ecx
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mov edx,ecx
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shr ecx,3
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and edx,7
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test ecx,ecx
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jz short .2
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push edx
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align 8
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.1: mov eax,[28+edi]
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lea edi,[32+edi]
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mov eax,[esi]
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mov edx,[4+esi]
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sbb eax,ebx
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mov ebx,[4+ebp]
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sbb edx,ebx
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mov ebx,[8+ebp]
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mov [-32+edi],eax
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mov [-28+edi],edx
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mov eax,[8+esi]
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mov edx,[12+esi]
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sbb eax,ebx
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mov ebx,[12+ebp]
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sbb edx,ebx
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mov ebx,[16+ebp]
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mov [-24+edi],eax
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mov [-20+edi],edx
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mov eax,[16+esi]
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mov edx,[20+esi]
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sbb eax,ebx
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mov ebx,[20+ebp]
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sbb edx,ebx
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mov ebx,[24+ebp]
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mov [-16+edi],eax
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mov [-12+edi],edx
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mov eax,[24+esi]
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mov edx,[28+esi]
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sbb eax,ebx
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mov ebx,[28+ebp]
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sbb edx,ebx
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mov ebx,[32+ebp]
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mov [-8+edi],eax
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mov [-4+edi],edx
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lea esi,[32+esi]
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lea ebp,[32+ebp]
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dec ecx
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jnz short .1
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pop edx
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.2: dec edx
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js short .4
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inc edx
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.3: lea edi,[4+edi]
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mov eax,[esi]
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sbb eax,ebx
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mov ebx,[4+ebp]
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mov [-4+edi],eax
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lea esi,[4+esi]
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lea ebp,[4+ebp]
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dec edx
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jnz short .3
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.4: mov eax,[esi]
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sbb eax,ebx
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mov [edi],eax
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sbb eax,eax
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neg eax
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pop ebp
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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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