120 lines
3.1 KiB
NASM
120 lines
3.1 KiB
NASM
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; Copyright 2001, 2002 Free Software 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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global ___gmpn_copyd
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%ifdef DLL
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export ___gmpn_copyd
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%endif
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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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%define SAVE_ESI PARAM_SIZE
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%define SAVE_EDI PARAM_SRC
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%define frame 0
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section .text
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align 16
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___gmpn_copyd:
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mov ecx,[PARAM_SIZE]
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mov [SAVE_ESI],esi
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mov esi,[PARAM_SRC]
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mov [SAVE_EDI],edi
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mov edi,[PARAM_DST]
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sub ecx,1
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jb Lzero
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mov eax,[esi+ecx*4] ; src[size-1]
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jz Lone
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mov edx,[-4+esi+ecx*4] ; src[size-2]
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sub ecx,2
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jbe Ldone_loop ; 2 or 3 limbs only
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; The usual overlap is
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;
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; high low
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; +------------------+
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; | dst|
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; +------------------+
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; +------------------+
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; | src|
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; +------------------+
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;
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; We can use an incrementing copy in the following circumstances.
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;
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; src+4*size<=dst,since then the regions are disjoint
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;
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; src==dst,clearly (though this shouldn't occur normally)
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;
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; src>dst,since in that case it's a requirement of the
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; parameters that src>=dst+size*4,and hence the
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; regions are disjoint
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;
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; eax prev high limb
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; ebx
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; ecx counter,size-3 down to 0 or -1,inclusive,by 2s
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; edx prev low limb
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; esi src
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; edi dst
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; ebp
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lea edx,[edi+ecx*4]
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cmp esi,edi
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jae Luse_movsl ; src >= dst
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cmp edx,edi
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mov edx,[4+esi+ecx*4] ; src[size-2] again
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jbe Luse_movsl ; src+4*size <= dst
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Ltop:
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mov [8+edi+ecx*4],eax
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mov eax,[esi+ecx*4]
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mov [4+edi+ecx*4],edx
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mov edx,[-4+esi+ecx*4]
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sub ecx,2
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jnbe Ltop
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Ldone_loop:
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mov [8+edi+ecx*4],eax
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mov [4+edi+ecx*4],edx
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; copy low limb (needed if size was odd,but will already have been
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; done in the loop if size was even)
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mov eax,[esi]
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Lone:
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mov [edi],eax
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mov edi,[SAVE_EDI]
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mov esi,[SAVE_ESI]
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ret
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Luse_movsl:
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add ecx,3
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cld
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rep movsd
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Lzero:
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mov esi,[SAVE_ESI]
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mov edi,[SAVE_EDI]
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ret
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end
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