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358 lines
12 KiB
ObjectPascal
358 lines
12 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 x86 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 rgx86;
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{$i fpcdefs.inc}
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interface
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uses
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cclasses,globtype,
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cpubase,cpuinfo,cgbase,cgutils,
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aasmbase,aasmtai,aasmcpu,
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rgobj;
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type
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trgx86 = class(trgobj)
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function get_spill_subreg(r : tregister) : tsubregister;override;
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function do_spill_replace(list:Taasmoutput;instr:taicpu;orgreg:tsuperregister;const spilltemp:treference):boolean;override;
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end;
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tpushedsavedloc = record
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case byte of
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0: (pushed: boolean);
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1: (ofs: longint);
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end;
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tpushedsavedfpu = array[tsuperregister] of tpushedsavedloc;
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trgx86fpu = class
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{ The "usableregsxxx" contain all registers of type "xxx" that }
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{ aren't currently allocated to a regvar. The "unusedregsxxx" }
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{ contain all registers of type "xxx" that aren't currently }
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{ allocated }
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unusedregsfpu,usableregsfpu : Tsuperregisterset;
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{ these counters contain the number of elements in the }
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{ unusedregsxxx/usableregsxxx sets }
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countunusedregsfpu : byte;
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{ Contains the registers which are really used by the proc itself.
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It doesn't take care of registers used by called procedures
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}
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used_in_proc : tcpuregisterset;
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{reg_pushes_other : regvarother_longintarray;
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is_reg_var_other : regvarother_booleanarray;
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regvar_loaded_other : regvarother_booleanarray;}
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{ tries to hold the amount of times which the current tree is processed }
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t_times: longint;
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fpuvaroffset : byte;
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constructor create;
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function getregisterfpu(list: taasmoutput) : tregister;
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procedure ungetregisterfpu(list: taasmoutput; r : tregister);
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{ pushes and restores registers }
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procedure saveusedfpuregisters(list:Taasmoutput;
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var saved:Tpushedsavedfpu;
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const s:Tcpuregisterset);
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procedure restoreusedfpuregisters(list:Taasmoutput;
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const saved:Tpushedsavedfpu);
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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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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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function trgx86.get_spill_subreg(r : tregister) : tsubregister;
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begin
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result:=getsubreg(r);
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end;
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function trgx86.do_spill_replace(list:Taasmoutput;instr:taicpu;orgreg:tsuperregister;const spilltemp:treference):boolean;
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var
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replaceoper : longint;
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begin
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result:=false;
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with instr do
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begin
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replaceoper:=-1;
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case ops of
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1 :
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begin
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if (oper[0]^.typ=top_reg) then
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begin
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if getsupreg(oper[0]^.reg)<>orgreg then
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internalerror(200410101);
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replaceoper:=0;
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end;
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end;
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2,3 :
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begin
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{ We can handle opcodes with 2 and 3 operands the same way. The opcodes
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with 3 registers are shrd/shld, where the 3rd operand is const or CL,
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that doesn't need spilling }
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if (oper[0]^.typ=top_reg) and
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(oper[1]^.typ=top_reg) and
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(getsupreg(oper[0]^.reg)<>getsupreg(oper[1]^.reg)) then
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begin
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{ One of the arguments shall be able to be replaced }
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if (getregtype(oper[0]^.reg)=regtype) and
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(getsupreg(oper[0]^.reg)=orgreg) then
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replaceoper:=0
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else
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if (getregtype(oper[0]^.reg)=regtype) and
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(getsupreg(oper[1]^.reg)=orgreg) then
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replaceoper:=1
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else
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internalerror(200410101);
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case replaceoper of
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0 :
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begin
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{ Some instructions don't allow memory references
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for source }
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case instr.opcode of
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A_BT,
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A_BTS,
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A_BTC,
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A_BTR :
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replaceoper:=-1;
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end;
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end;
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1 :
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begin
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{ Some instructions don't allow memory references
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for destination }
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case instr.opcode of
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A_SHLD,
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A_SHRD,
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A_IMUL :
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replaceoper:=-1;
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end;
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end;
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end;
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end;
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end;
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end;
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{ Replace register with spill reference }
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if replaceoper<>-1 then
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begin
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oper[replaceoper]^.typ:=top_ref;
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new(oper[replaceoper]^.ref);
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oper[replaceoper]^.ref^:=spilltemp;
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result:=true;
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end;
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end;
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end;
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{******************************************************************************
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Trgx86fpu
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******************************************************************************}
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constructor Trgx86fpu.create;
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begin
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used_in_proc:=[];
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t_times := 0;
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unusedregsfpu:=usableregsfpu;
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end;
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function trgx86fpu.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:=NR_ST;
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end;
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procedure trgx86fpu.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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function trgx86fpu.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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procedure trgx86fpu.saveusedfpuregisters(list: taasmoutput;
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var saved : tpushedsavedfpu;
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const s: tcpuregisterset);
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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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used_in_proc:=used_in_proc+s;
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{$warning TODO firstsavefpureg}
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(*
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{ don't try to save the fpu registers if not desired (e.g. for }
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{ the 80x86) }
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if firstsavefpureg <> R_NO then
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for r.enum:=firstsavefpureg to lastsavefpureg do
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begin
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saved[r.enum].ofs:=reg_not_saved;
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{ if the register is used by the calling subroutine and if }
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{ it's not a regvar (those are handled separately) }
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if not is_reg_var_other[r.enum] and
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(r.enum in s) and
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{ and is present in use }
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not(r.enum in unusedregsfpu) then
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begin
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{ then save it }
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tg.GetTemp(list,extended_size,tt_persistent,hr);
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saved[r.enum].ofs:=hr.offset;
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cg.a_loadfpu_reg_ref(list,OS_FLOAT,r,hr);
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cg.a_reg_dealloc(list,r);
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include(unusedregsfpu,r.enum);
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inc(countunusedregsfpu);
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end;
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end;
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*)
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end;
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procedure trgx86fpu.restoreusedfpuregisters(list : taasmoutput;
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const saved : tpushedsavedfpu);
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var
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r,r2 : tregister;
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hr : treference;
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begin
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{$warning TODO firstsavefpureg}
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(*
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if firstsavefpureg <> R_NO then
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for r.enum:=lastsavefpureg downto firstsavefpureg do
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begin
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if saved[r.enum].ofs <> reg_not_saved then
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begin
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r2.enum:=R_INTREGISTER;
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r2.number:=NR_FRAME_POINTER_REG;
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reference_reset_base(hr,r2,saved[r.enum].ofs);
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cg.a_reg_alloc(list,r);
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cg.a_loadfpu_ref_reg(list,OS_FLOAT,hr,r);
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if not (r.enum in unusedregsfpu) then
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{ internalerror(10)
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in n386cal we always save/restore the reg *state*
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using save/restoreunusedstate -> the current state
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may not be real (JM) }
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else
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begin
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dec(countunusedregsfpu);
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exclude(unusedregsfpu,r.enum);
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end;
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tg.UnGetTemp(list,hr);
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end;
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end;
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*)
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end;
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(*
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procedure Trgx86fpu.saveotherregvars(list: taasmoutput; const s: totherregisterset);
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var
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r: Tregister;
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begin
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if not(cs_regvars in aktglobalswitches) then
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exit;
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if firstsavefpureg <> NR_NO then
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for r.enum := firstsavefpureg to lastsavefpureg do
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if is_reg_var_other[r.enum] and
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(r.enum in s) then
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store_regvar(list,r);
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end;
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*)
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end.
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{
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$Log$
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Revision 1.10 2004-10-31 21:45:04 peter
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* generic tlocation
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* move tlocation to cgutils
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Revision 1.9 2004/10/10 16:30:26 peter
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* optimized spilling writing when the reg operand can be
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replaced by reference
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Revision 1.8 2004/10/05 20:41:02 peter
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* more spilling rewrites
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Revision 1.7 2004/10/04 20:46:22 peter
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* spilling code rewritten for x86. It now used the generic
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spilling routines. Special x86 optimization still needs
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to be added.
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* Spilling fixed when both operands needed to be spilled
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* Cleanup of spilling routine, do_spill_readwritten removed
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Revision 1.6 2004/09/27 14:49:45 peter
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* handle 3 operand opcodes the same as 2 operand opcodes, the
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third operand can only be a const or register CL, so it doesn't
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affect spilling
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* support shrd/shld that don't allow memory operands
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Revision 1.5 2004/09/26 07:15:07 florian
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* ie checking in spilling code improved
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Revision 1.4 2004/06/20 08:55:32 florian
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* logs truncated
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Revision 1.3 2004/06/16 20:07:11 florian
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* dwarf branch merged
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Revision 1.2.2.1 2004/04/10 12:36:42 peter
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* fixed alignment issues
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Revision 1.2 2004/01/12 16:37:59 peter
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* moved spilling code from taicpu to rg
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}
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