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72 lines
2.0 KiB
ObjectPascal
72 lines
2.0 KiB
ObjectPascal
{
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Copyright (c) 1998-2002 by Florian Klaempfl
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This unit implements the i386 specific class for the register
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allocator
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This program 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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This program 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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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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****************************************************************************
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}
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unit rgcpu;
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{$i fpcdefs.inc}
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interface
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uses
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cpubase,
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cpuinfo,
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aasmbase,aasmtai,
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cclasses,globtype,cgbase,rgobj,rgx86;
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type
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trgcpu = class(trgx86)
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procedure add_constraints(reg:Tregister);override;
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end;
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implementation
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uses
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systems,
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verbose;
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const
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{ This value is used in tsaved. If the array value is equal
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to this, then this means that this register is not used.}
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reg_not_saved = $7fffffff;
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{************************************************************************
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trgcpu
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*************************************************************************}
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procedure trgcpu.add_constraints(reg:Tregister);
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var
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supreg : tsuperregister;
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begin
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if getsubreg(reg) in [R_SUBL,R_SUBH] then
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begin
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{ Some registers have no 8-bit subregister }
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supreg:=getsupreg(reg);
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add_edge(supreg,RS_ESI);
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add_edge(supreg,RS_EDI);
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add_edge(supreg,RS_EBP);
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end;
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end;
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end.
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