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{
Copyright (c) 1998-2002 by Florian Klaempfl
Generate i386 assembler for in memory related nodes
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit n386mem;
{$i fpcdefs.inc}
interface
uses
globtype,
cgbase,cpuinfo,cpubase,
node,nmem,ncgmem;
type
ti386addrnode = class(tcgaddrnode)
procedure pass_2;override;
end;
ti386derefnode = class(tcgderefnode)
procedure pass_2;override;
end;
ti386vecnode = class(tcgvecnode)
procedure update_reference_reg_mul(reg:tregister;l:aint);override;
procedure pass_2;override;
end;
implementation
uses
systems,
cutils,verbose,
symdef,paramgr,
aasmtai,
nld,ncon,nadd,
cgutils,cgobj;
{*****************************************************************************
TI386ADDRNODE
*****************************************************************************}
procedure ti386addrnode.pass_2;
begin
inherited pass_2;
{ for use of other segments, not used }
{if left.location.reference.segment<>NR_NO then
location.segment:=left.location.reference.segment;}
end;
{*****************************************************************************
TI386DEREFNODE
*****************************************************************************}
procedure ti386derefnode.pass_2;
begin
inherited pass_2;
if tpointerdef(left.resulttype.def).is_far then
location.reference.segment:=NR_FS;
end;
{*****************************************************************************
TI386VECNODE
*****************************************************************************}
procedure ti386vecnode.update_reference_reg_mul(reg:tregister;l:aint);
var
l2 : integer;
hreg : tregister;
begin
{ Optimized for x86 to use the index register and scalefactor }
if location.reference.index=NR_NO then
begin
{ no preparations needed }
end
else if location.reference.base=NR_NO then
begin
case location.reference.scalefactor of
2 : cg.a_op_const_reg(exprasmlist,OP_SHL,OS_ADDR,1,location.reference.index);
4 : cg.a_op_const_reg(exprasmlist,OP_SHL,OS_ADDR,2,location.reference.index);
8 : cg.a_op_const_reg(exprasmlist,OP_SHL,OS_ADDR,3,location.reference.index);
end;
location.reference.base:=location.reference.index;
end
else
begin
hreg := cg.getaddressregister(exprasmlist);
cg.a_loadaddr_ref_reg(exprasmlist,location.reference,hreg);
reference_reset_base(location.reference,hreg,0);
end;
{ insert the new index register and scalefactor or
do the multiplication manual }
case l of
1,2,4,8 : location.reference.scalefactor:=l;
else
begin
if ispowerof2(l,l2) then
cg.a_op_const_reg(exprasmlist,OP_SHL,OS_ADDR,l2,reg)
else
cg.a_op_const_reg(exprasmlist,OP_IMUL,OS_ADDR,l,reg);
end;
end;
location.reference.index:=reg;
end;
procedure ti386vecnode.pass_2;
begin
inherited pass_2;
if nf_memseg in flags then
location.reference.segment:=NR_FS;
end;
begin
caddrnode:=ti386addrnode;
cderefnode:=ti386derefnode;
cvecnode:=ti386vecnode;
end.
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