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{
Copyright (c) 1998-2002 by Florian Klaempfl
This unit implements the i386 specific class for the register
allocator
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 rgcpu;
{$i fpcdefs.inc}
interface
uses
cpubase,
cpuinfo,
aasmbase,aasmtai,aasmdata,
cclasses,globtype,cgbase,rgobj,rgx86;
type
trgcpu = class(trgx86)
procedure add_constraints(reg:Tregister);override;
end;
implementation
uses
systems,
verbose;
const
{ This value is used in tsaved. If the array value is equal
to this, then this means that this register is not used.}
reg_not_saved = $7fffffff;
{************************************************************************
trgcpu
*************************************************************************}
procedure trgcpu.add_constraints(reg:Tregister);
var
supreg : tsuperregister;
begin
if getsubreg(reg) in [R_SUBL,R_SUBH] then
begin
{ Some registers have no 8-bit subregister }
supreg:=getsupreg(reg);
add_edge(supreg,RS_ESI);
add_edge(supreg,RS_EDI);
add_edge(supreg,RS_EBP);
end;
end;
end.
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