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https://gitlab.com/freepascal.org/fpc/source.git
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25059e21b6
+ Scratch registers unavailable when new register allocator used + maybe_save/maybe_restore unavailable when new register allocator used
98 lines
3.1 KiB
ObjectPascal
98 lines
3.1 KiB
ObjectPascal
{******************************************************************************
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$Id$
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Copyright (c) 1998-2002 by Florian Klaempfl
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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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unit rgcpu;
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{ This unit implements the processor specific class for the register allocator}
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{$INCLUDE 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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aasmcpu,
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aasmtai,
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cclasses,globtype,cgbase,aasmbase,rgobj;
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type
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{This class implements the cpu spaecific register allocator. It is used by the
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code generator to allocate and free registers which might be valid across
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nodes. It also contains utility routines related to registers. Some of the
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methods in this class overrides generic implementations in rgobj.pas.}
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trgcpu=class(trgobj)
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function GetExplicitRegisterInt(list:taasmoutput;Reg:Tnewregister):tregister;override;
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procedure UngetregisterInt(list:taasmoutput;Reg:tregister);override;
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end;
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implementation
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uses
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cgobj,verbose;
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function TRgCpu.GetExplicitRegisterInt(list:TAasmOutput;reg:TNewRegister):TRegister;
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var
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r:TRegister;
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begin
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if(reg=RS_O7)or(reg=NR_I7)
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then
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begin
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r.enum:=R_INTREGISTER;
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r.number:=reg;
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cg.a_reg_alloc(list,r);
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result:=r;
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end
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else
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result:=inherited GetExplicitRegisterInt(list,reg);
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end;
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procedure trgcpu.UngetRegisterInt(list:taasmoutput;reg:tregister);
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begin
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if reg.enum<>R_INTREGISTER
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then
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internalerror(200302191);
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if (reg.number=RS_O7) or (reg.number=NR_I7)
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then
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cg.a_reg_dealloc(list,reg)
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else
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inherited ungetregisterint(list,reg);
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end;
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begin
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rg := trgcpu.create(24); {24 registers.}
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end.
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{
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$Log$
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Revision 1.9 2003-04-22 10:09:35 daniel
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+ Implemented the actual register allocator
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+ Scratch registers unavailable when new register allocator used
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+ maybe_save/maybe_restore unavailable when new register allocator used
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Revision 1.8 2003/03/15 22:51:58 mazen
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* remaking sparc rtl compile
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Revision 1.7 2003/03/10 21:59:54 mazen
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* fixing index overflow in handling new registers arrays.
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Revision 1.6 2003/02/19 22:00:17 daniel
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* Code generator converted to new register notation
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- Horribily outdated todo.txt removed
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Revision 1.5 2003/01/08 18:43:58 daniel
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* Tregister changed into a record
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Revision 1.4 2002/10/13 21:46:07 mazen
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* assembler output format fixed
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Revision 1.3 2002/10/12 19:03:23 mazen
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* Get/Unget expilit registers to be re-examined
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}
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