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316 lines
10 KiB
ObjectPascal
316 lines
10 KiB
ObjectPascal
{
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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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{$i fpcdefs.inc}
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interface
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uses
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cpubase,
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cpuinfo,
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aasmbase,aasmtai,aasmcpu,
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cclasses,globtype,cgbase,cginfo,rgobj;
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type
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trgcpu = class(trgobj)
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fpuvaroffset : byte;
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function getregisterfpu(list: taasmoutput;size:TCGSize) : tregister; override;
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procedure ungetregisterfpu(list: taasmoutput; r : tregister;size:TCGSize); override;
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{# Returns a subset register of the register r with the specified size.
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WARNING: There is no clearing of the upper parts of the register,
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if a 8-bit / 16-bit register is converted to a 32-bit register.
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It is up to the code generator to correctly zero fill the register
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}
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function makeregsize(reg: tregister; size: tcgsize): tregister; override;
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{ pushes and restores registers }
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{$ifdef SUPPORT_MMX}
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procedure pushusedotherregisters(list:Taasmoutput;
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var pushed:Tpushedsavedother;
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const s:Totherregisterset);
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{$endif SUPPORT_MMX}
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{$ifdef SUPPORT_MMX}
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procedure popusedotherregisters(list:Taasmoutput;
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const pushed:Tpushedsavedother);
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{$endif SUPPORT_MMX}
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procedure saveusedotherregisters(list:Taasmoutput;
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var saved:Tpushedsavedother;
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const s:Totherregisterset);override;
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procedure restoreusedotherregisters(list:Taasmoutput;
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const saved:Tpushedsavedother);override;
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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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end;
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implementation
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uses
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systems,
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globals,verbose,
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tgobj;
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function trgcpu.getregisterfpu(list: taasmoutput;size: TCGSize) : 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:=NR_ST;
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end;
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procedure trgcpu.ungetregisterfpu(list : taasmoutput; r : tregister;size:TCGSize);
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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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{$ifdef SUPPORT_MMX}
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procedure trgcpu.pushusedotherregisters(list:Taasmoutput;
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var pushed:Tpushedsavedother;
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const s:Totherregisterset);
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{ var r:Toldregister;
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r2:Tregister;
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hr:Treference;}
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begin
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(* used_in_proc_other:=used_in_proc_other+s;
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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_other[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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r2.enum:=R_INTREGISTER;
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r2.number:=NR_ESP;
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list.concat(Taicpu.Op_const_reg(A_SUB,S_L,8,r2));
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reference_reset_base(hr,r2,0);
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r2.enum:=r;
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list.concat(Taicpu.Op_reg_ref(A_MOVQ,S_NO,r2,hr));
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include(unusedregsmm,r);
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pushed[r].pushed:=true;
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end;
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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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{$endif SUPPORT_MMX}
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{$ifdef SUPPORT_MMX}
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procedure trgcpu.popusedotherregisters(list:Taasmoutput;
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const pushed:Tpushedsavedother);
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{ var r:Toldregister;
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r2,r3:Tregister;
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hr:Treference;}
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begin
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{ restore in reverse order: }
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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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r2.enum:=R_INTREGISTER;
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r2.number:=NR_ESP;
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reference_reset_base(hr,r2,0);
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r3.enum:=r;
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list.concat(Taicpu.op_ref_reg(A_MOVQ,S_NO,hr,r3));
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list.concat(Taicpu.op_const_reg(A_ADD,S_L,8,r2));
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exclude(unusedregsmm,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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{$endif SUPPORT_MMX}
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procedure trgcpu.saveusedotherregisters(list:Taasmoutput;var saved:Tpushedsavedother;
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const s:totherregisterset);
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begin
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{$ifdef SUPPORT_MMX}
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if (aktoptprocessor in [class386,classP5]) or
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(CS_LittleSize in aktglobalswitches) then
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pushusedotherregisters(list,saved,s)
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else
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{$endif SUPPORT_MMX}
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inherited saveusedotherregisters(list,saved,s);
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end;
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procedure trgcpu.restoreusedotherregisters(list:Taasmoutput;
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const saved:tpushedsavedother);
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begin
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{$ifdef SUPPORT_MMX}
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if (aktoptprocessor in [class386,classP5]) or
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(CS_LittleSize in aktglobalswitches) then
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popusedotherregisters(list,saved)
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else
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{$endif SUPPORT_MMX}
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inherited restoreusedotherregisters(list,saved);
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end;
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procedure trgcpu.resetusableregisters;
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begin
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inherited resetusableregisters;
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fpuvaroffset := 0;
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end;
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function trgcpu.correct_fpuregister(r : tregister;ofs : byte) : tregister;
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begin
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correct_fpuregister:=r;
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setsupreg(correct_fpuregister,ofs);
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end;
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function trgcpu.makeregsize(reg: tregister; size: tcgsize): tregister;
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var
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subreg : tsubregister;
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begin
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if getregtype(reg)<>R_INTREGISTER then
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internalerror(200306032);
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subreg:=cgsize2subreg(size);
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result:=reg;
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setsubreg(result,subreg);
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add_constraints(result);
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end;
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end.
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{
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$Log$
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Revision 1.6 2003-09-24 17:12:02 florian
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* several fixes for new reg allocator
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Revision 1.5 2003/06/13 21:19:33 peter
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* current_procdef removed, use current_procinfo.procdef instead
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Revision 1.4 2002/04/25 20:15:40 florian
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* block nodes within expressions shouldn't release the used registers,
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fixed using a flag till the new rg is ready
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Revision 1.3 2003/01/05 13:36:54 florian
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* x86-64 compiles
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+ very basic support for float128 type (x86-64 only)
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Revision 1.2 2002/07/25 22:55:34 florian
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* several fixes, small test units can be compiled
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Revision 1.1 2002/07/24 22:38:15 florian
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+ initial release of x86-64 target code
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Revision 1.8 2002/07/01 18:46:34 peter
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* internal linker
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* reorganized aasm layer
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Revision 1.7 2002/05/16 19:46:52 carl
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+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
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+ try to fix temp allocation (still in ifdef)
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+ generic constructor calls
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+ start of tassembler / tmodulebase class cleanup
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Revision 1.6 2002/05/12 16:53:18 peter
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* moved entry and exitcode to ncgutil and cgobj
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* foreach gets extra argument for passing local data to the
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iterator function
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* -CR checks also class typecasts at runtime by changing them
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into as
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* fixed compiler to cycle with the -CR option
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* fixed stabs with elf writer, finally the global variables can
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be watched
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* removed a lot of routines from cga unit and replaced them by
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calls to cgobj
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* u32bit-s32bit updates for and,or,xor nodes. When one element is
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u32bit then the other is typecasted also to u32bit without giving
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a rangecheck warning/error.
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* fixed pascal calling method with reversing also the high tree in
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the parast, detected by tcalcst3 test
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Revision 1.5 2002/04/21 15:43:32 carl
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* changeregsize -> rg.makeregsize
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* changeregsize moved from cpubase to here
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Revision 1.4 2002/04/15 19:44:22 peter
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* fixed stackcheck that would be called recursively when a stack
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error was found
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* generic changeregsize(reg,size) for i386 register resizing
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* removed some more routines from cga unit
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* fixed returnvalue handling
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* fixed default stacksize of linux and go32v2, 8kb was a bit small :-)
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Revision 1.3 2002/04/04 19:06:13 peter
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* removed unused units
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* use tlocation.size in cg.a_*loc*() routines
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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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* push/popusedregisters is now called rg.save/restoreusedregisters and
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(for i386) uses temps instead of push/pop's when using -Op3 (that code is
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also better optimizable)
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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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