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339 lines
11 KiB
ObjectPascal
339 lines
11 KiB
ObjectPascal
{*****************************************************************************}
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{ File : rgcpu.pas }
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{ Author : Mazen NEIFER }
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{ Project : Free Pascal Compiler (FPC) }
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{ Creation date : 2002\26\26 }
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{ Last modification date : 2002\08\20 }
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{ Licence : GPL }
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{ Bug report : mazen.neifer.01@supaero.org }
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{*****************************************************************************}
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{
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$Id$
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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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{$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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trgcpu = class(trgobj)
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{ to keep the same allocation order as with the old routines }
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function getregisterint(list: taasmoutput): tregister; override;
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procedure ungetregisterint(list: taasmoutput; r : tregister); override;
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function getexplicitregisterint(list: taasmoutput; r : tregister) : tregister; override;
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function getregisterfpu(list: taasmoutput) : tregister; override;
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procedure ungetregisterfpu(list: taasmoutput; r : tregister); override;
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procedure ungetreference(list: taasmoutput; const ref : treference); override;
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{ pushes and restores registers }
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procedure pushusedregisters(list: taasmoutput;
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var pushed : tpushedsaved;const s: tregisterset);
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procedure popusedregisters(list: taasmoutput;
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const pushed : tpushedsaved);
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procedure resetusableregisters;override;
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{ corrects the fpu stack register by ofs }
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function correct_fpuregister(r : tregister;ofs : byte) : tregister;
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fpuvaroffset : byte;
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end;
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implementation
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uses
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systems,
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globals,verbose,node,
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cgobj,tgobj,cga;
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function trgcpu.getregisterint(list: taasmoutput): tregister;
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begin
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if countunusedregsint=0 then
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internalerror(10);(*
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{$ifdef TEMPREGDEBUG}
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if curptree^.usableregsint-countunusedregsint>curptree^.registers32 then
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internalerror(10);
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{$endif TEMPREGDEBUG}
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{$ifdef EXTTEMPREGDEBUG}
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if curptree^.usableregs-countunusedregistersint>curptree^^.reallyusedregs then
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curptree^.reallyusedregs:=curptree^^.usableregs-countunusedregistersint;
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{$endif EXTTEMPREGDEBUG}
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dec(countunusedregsint);
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if R_EAX in unusedregsint then
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begin
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exclude(unusedregsint,R_EAX);
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include(usedinproc,R_EAX);
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getregisterint:=R_EAX;
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{$ifdef TEMPREGDEBUG}
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reg_user[R_EAX]:=curptree^;
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{$endif TEMPREGDEBUG}
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exprasmlist.concat(tairegalloc.alloc(R_EAX));
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end
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else if R_EDX in unusedregsint then
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begin
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exclude(unusedregsint,R_EDX);
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include(usedinproc,R_EDX);
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getregisterint:=R_EDX;
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{$ifdef TEMPREGDEBUG}
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reg_user[R_EDX]:=curptree^;
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{$endif TEMPREGDEBUG}
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exprasmlist.concat(tairegalloc.alloc(R_EDX));
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end
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else if R_EBX in unusedregsint then
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begin
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exclude(unusedregsint,R_EBX);
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include(usedinproc,R_EBX);
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getregisterint:=R_EBX;
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{$ifdef TEMPREGDEBUG}
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reg_user[R_EBX]:=curptree^;
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{$endif TEMPREGDEBUG}
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exprasmlist.concat(tairegalloc.alloc(R_EBX));
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end
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else if R_ECX in unusedregsint then
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begin
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exclude(unusedregsint,R_ECX);
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include(usedinproc,R_ECX);
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getregisterint:=R_ECX;
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{$ifdef TEMPREGDEBUG}
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reg_user[R_ECX]:=curptree^;
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{$endif TEMPREGDEBUG}
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exprasmlist.concat(tairegalloc.alloc(R_ECX));
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end
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else internalerror(10);
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{$ifdef TEMPREGDEBUG}
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testregisters;
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{$endif TEMPREGDEBUG}*)
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end;
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procedure trgcpu.ungetregisterint(list: taasmoutput; r : tregister);
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begin
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{ if (r = R_EDI) or
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((not assigned(procinfo^._class)) and (r = R_ESI)) then
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begin
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list.concat(Tairegalloc.DeAlloc(r));
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exit;
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end;
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if not(r in [R_EAX,R_EBX,R_ECX,R_EDX]) then
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exit;
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inherited ungetregisterint(list,r);}
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end;
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function trgcpu.getexplicitregisterint(list: taasmoutput; r : tregister) : tregister;
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begin
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{ if r in [R_ESI,R_EDI] then
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begin
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list.concat(Tairegalloc.Alloc(r));
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getexplicitregisterint := r;
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exit;
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end;}
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result := inherited getexplicitregisterint(list,r);
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end;
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function trgcpu.getregisterfpu(list: taasmoutput) : tregister;
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begin
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{ note: don't return R_ST0, see comments above implementation of }
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{ a_loadfpu_* methods in cgcpu (JM) }
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// result := R_ST;
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end;
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procedure trgcpu.ungetregisterfpu(list : taasmoutput; r : tregister);
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begin
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{ nothing to do, fpu stack management is handled by the load/ }
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{ store operations in cgcpu (JM) }
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end;
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procedure trgcpu.ungetreference(list: taasmoutput; const ref : treference);
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begin
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ungetregisterint(list,ref.base);
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ungetregisterint(list,ref.index);
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end;
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procedure trgcpu.pushusedregisters(list: taasmoutput;
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var pushed : tpushedsaved; const s: tregisterset);
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var
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r: tregister;
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hr: treference;
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begin
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usedinproc:=usedinproc + s;
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(* for r:=R_EAX to R_EBX do
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begin
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pushed[r].pushed:=false;
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{ if the register is used by the calling subroutine }
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if not is_reg_var[r] and
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(r in s) and
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{ and is present in use }
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not(r in unusedregsint) then
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begin
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{ then save it }
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list.concat(Taicpu.Op_reg(A_PUSH,S_L,r));
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include(unusedregsint,r);
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inc(countunusedregsint);
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pushed[r].pushed:=true;
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end;
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end;*)
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{$ifdef SUPPORT_MMX}
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(*for r:=R_MM0 to R_MM6 do
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begin
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pushed[r].pushed:=false;
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{ if the register is used by the calling subroutine }
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if not is_reg_var[r] and
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(r in s) and
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{ and is present in use }
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not(r in unusedregsmm) then
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begin
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list.concat(Taicpu.Op_const_reg(A_SUB,S_L,8,R_ESP));
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reference_reset_base(hr,R_ESP,0);
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list.concat(Taicpu.Op_reg_ref(A_MOVQ,S_NO,r,hr));
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include(unusedregsmm,r);
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inc(countunusedregsmm);
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pushed[r].pushed:=true;
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end;
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end;*)
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{$endif SUPPORT_MMX}
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{$ifdef TEMPREGDEBUG}
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testregisters;
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{$endif TEMPREGDEBUG}
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end;
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procedure trgcpu.popusedregisters(list: taasmoutput;
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const pushed : tpushedsaved);
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var
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r : tregister;
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{$ifdef SUPPORT_MMX}
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hr : treference;
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{$endif SUPPORT_MMX}
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begin
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{ restore in reverse order: }
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{$ifdef SUPPORT_MMX}
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for r:=R_MM6 downto R_MM0 do
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if pushed[r].pushed then
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begin
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reference_reset_base(hr,R_ESP,0);
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list.concat(Taicpu.Op_ref_reg(
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A_MOVQ,S_NO,hr,r));
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list.concat(Taicpu.Op_const_reg(
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A_ADD,S_L,8,R_ESP));
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if not (r in unusedregsmm) then
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{ internalerror(10)
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in cg386cal we always restore regs
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that appear as used
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due to a unused tmep storage PM }
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else
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dec(countunusedregsmm);
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exclude(unusedregsmm,r);
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end;
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{$endif SUPPORT_MMX}
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(* for r:=R_EBX downto R_EAX do
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if pushed[r].pushed then
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begin
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list.concat(Taicpu.Op_reg(A_POP,S_L,r));
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if not (r in unusedregsint) then
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{ internalerror(10)
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in cg386cal we always restore regs
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that appear as used
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due to a unused tmep storage PM }
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else
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dec(countunusedregsint);
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exclude(unusedregsint,r);
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end;*)
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{$ifdef TEMPREGDEBUG}
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testregisters;
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{$endif TEMPREGDEBUG}
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end;
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procedure trgcpu.resetusableregisters;
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begin
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inherited resetusableregisters;
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fpuvaroffset := 0;
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end;
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function trgcpu.correct_fpuregister(r : tregister;ofs : byte) : tregister;
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begin
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correct_fpuregister:=tregister(longint(r)+ofs);
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end;
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initialization
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rg := trgcpu.create;
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end.
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{
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$Log$
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Revision 1.1 2002-08-21 13:30:07 mazen
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*** empty log message ***
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Revision 1.2 2002/04/02 17:11:39 peter
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* tlocation,treference update
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* LOC_CONSTANT added for better constant handling
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* secondadd splitted in multiple routines
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* location_force_reg added for loading a location to a register
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of a specified size
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* secondassignment parses now first the right and then the left node
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(this is compatible with Kylix). This saves a lot of push/pop especially
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with string operations
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* adapted some routines to use the new cg methods
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Revision 1.1 2002/03/31 20:26:40 jonas
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+ a_loadfpu_* and a_loadmm_* methods in tcg
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* register allocation is now handled by a class and is mostly processor
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independent (+rgobj.pas and i386/rgcpu.pas)
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* temp allocation is now handled by a class (+tgobj.pas, -i386\tgcpu.pas)
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* some small improvements and fixes to the optimizer
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* some register allocation fixes
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* some fpuvaroffset fixes in the unary minus node
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* fixed and optimized register saving/restoring for new/dispose nodes
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* LOC_FPU locations now also require their "register" field to be set to
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R_ST, not R_ST0 (the latter is used for LOC_CFPUREGISTER locations only)
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- list field removed of the tnode class because it's not used currently
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and can cause hard-to-find bugs
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}
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