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700 lines
20 KiB
ObjectPascal
700 lines
20 KiB
ObjectPascal
{
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$Id$
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Copyright (C) 1998-2000 by Florian Klaempfl
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This unit handles the temporary variables stuff for i386
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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 tgcpu;
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{$INCLUDE fpcdefs.inc}
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interface
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uses
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globals,
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cgbase,verbose,aasm,
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node,
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cpubase,cpuasm
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;
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type
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tregisterset = set of tregister;
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tpushed = array[R_EAX..R_MM6] of boolean;
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tsaved = array[R_EAX..R_MM6] of longint;
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const
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usablereg32 : byte = 4;
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{ this value is used in tsaved, if the register isn't saved }
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reg_not_saved = $7fffffff;
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{$ifdef SUPPORT_MMX}
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usableregmmx : byte = 8;
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{$endif SUPPORT_MMX}
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var
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{ tries to hold the amount of times which the current tree is processed }
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t_times : longint;
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{$ifdef TEMPREGDEBUG}
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procedure testregisters32;
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{$endif TEMPREGDEBUG}
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function getregisterint : tregister;
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function getaddressregister: tregister;
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procedure ungetregister32(r : tregister);
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{ tries to allocate the passed register, if possible }
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function getexplicitregister32(r : tregister) : tregister;
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{$ifdef SUPPORT_MMX}
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function getregistermmx : tregister;
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procedure ungetregistermmx(r : tregister);
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{$endif SUPPORT_MMX}
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function isaddressregister(reg: tregister): boolean;
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procedure ungetregister(r : tregister);
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procedure cleartempgen;
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procedure del_reference(const ref : treference);
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procedure del_locref(const location : tlocation);
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procedure del_location(const l : tlocation);
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{ pushs and restores registers }
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procedure pushusedregisters(var pushed : tpushed;b : byte);
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procedure popusedregisters(const pushed : tpushed);
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{ saves register variables (restoring happens automatically (JM) }
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procedure saveregvars(b: byte);
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{ saves and restores used registers to temp. values }
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procedure saveusedregisters(var saved : tsaved;b : byte);
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procedure restoreusedregisters(const saved : tsaved);
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{ increments the push count of all registers in b}
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procedure incrementregisterpushed(b : byte);
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procedure clearregistercount;
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procedure resetusableregisters;
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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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type
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{$ifdef SUPPORT_MMX}
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regvar_longintarray = array[R_EAX..R_MM6] of longint;
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regvar_booleanarray = array[R_EAX..R_MM6] of boolean;
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regvar_ptreearray = array[R_EAX..R_MM6] of tnode;
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{$else SUPPORT_MMX}
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regvar_longintarray = array[R_EAX..R_EDI] of longint;
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regvar_booleanarray = array[R_EAX..R_EDI] of boolean;
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regvar_ptreearray = array[R_EAX..R_EDI] of tnode;
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{$endif SUPPORT_MMX}
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var
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unused,usableregs : tregisterset;
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c_usableregs : longint;
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{ uses only 1 byte while a set uses in FPC 32 bytes }
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usedinproc : byte;
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fpuvaroffset : byte;
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{ count, how much a register must be pushed if it is used as register }
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{ variable }
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reg_pushes : regvar_longintarray;
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is_reg_var : regvar_booleanarray;
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regvar_loaded: regvar_booleanarray;
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{$ifdef TEMPREGDEBUG}
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reg_user : regvar_ptreearray;
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reg_releaser : regvar_ptreearray;
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{$endif TEMPREGDEBUG}
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implementation
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uses
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globtype,temp_gen,tainst,regvars;
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procedure incrementregisterpushed(b : byte);
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var
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regi : tregister;
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begin
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for regi:=R_EAX to R_EDI do
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begin
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if (b and ($80 shr word(regi)))<>0 then
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inc(reg_pushes[regi],t_times*2);
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end;
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end;
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procedure pushusedregisters(var pushed : tpushed;b : byte);
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var
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r : tregister;
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{$ifdef SUPPORT_MMX}
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hr : preference;
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{$endif}
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begin
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usedinproc:=usedinproc or b;
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for r:=R_EAX to R_EBX do
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begin
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pushed[r]:=false;
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{ if the register is used by the calling subroutine }
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if ((b and ($80 shr byte(r)))<>0) then
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begin
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{ and is present in use }
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if not is_reg_var[r] then
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if not(r in unused) then
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begin
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{ then save it }
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exprasmlist.concat(Taicpu.Op_reg(A_PUSH,S_L,r));
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{ here was a big problem !!!!!}
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{ you cannot do that for a register that is
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globally assigned to a var
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this also means that you must push it much more
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often, but there must be a better way
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maybe by putting the value back to the stack !! }
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if not(is_reg_var[r]) then
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begin
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unused:=unused+[r];
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{$ifdef TEMPREGDEBUG}
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inc(usablereg32);
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{$endif TEMPREGDEBUG}
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end;
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pushed[r]:=true;
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end;
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end;
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end;
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{$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]:=false;
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{ if the mmx register is in use, save it }
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if not(r in unused) then
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begin
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exprasmList.concat(Taicpu.Op_const_reg(A_SUB,S_L,8,R_ESP));
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new(hr);
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reset_reference(hr^);
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hr^.base:=R_ESP;
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exprasmList.concat(Taicpu.Op_reg_ref(A_MOVQ,S_NO,r,hr));
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if not(is_reg_var[r]) then
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begin
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unused:=unused+[r];
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{$ifdef TEMPREGDEBUG}
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inc(usableregmmx);
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{$endif TEMPREGDEBUG}
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end;
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pushed[r]:=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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testregisters32;
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{$endif TEMPREGDEBUG}
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end;
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procedure saveregvars(b: byte);
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var
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r : tregister;
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begin
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if not(cs_regalloc in aktglobalswitches) then
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exit;
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for r:=R_EAX to R_EBX do
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{ if the register is used by the calling subroutine }
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if ((b and ($80 shr byte(r)))<>0) and is_reg_var[r] then
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store_regvar(exprasmlist,r)
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end;
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procedure saveusedregisters(var saved : tsaved;b : byte);
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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 or b;
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for r:=R_EAX to R_EBX do
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begin
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saved[r]:=reg_not_saved;
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{ if the register is used by the calling subroutine }
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if ((b and ($80 shr byte(r)))<>0) then
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begin
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{ and is present in use }
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if not(r in unused) then
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begin
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{ then save it }
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gettempofsizereference(4,hr);
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saved[r]:=hr.offset;
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exprasmList.concat(Taicpu.Op_reg_ref(A_MOV,S_L,r,newreference(hr)));
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{ here was a big problem !!!!!}
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{ you cannot do that for a register that is
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globally assigned to a var
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this also means that you must push it much more
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often, but there must be a better way
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maybe by putting the value back to the stack !! }
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if not(is_reg_var[r]) then
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begin
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unused:=unused+[r];
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{$ifdef TEMPREGDEBUG}
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inc(usablereg32);
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{$endif TEMPREGDEBUG}
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end;
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end;
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end;
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end;
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{$ifdef SUPPORT_MMX}
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for r:=R_MM0 to R_MM6 do
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begin
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saved[r]:=reg_not_saved;
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{ if the mmx register is in use, save it }
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if not(r in unused) then
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begin
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gettempofsizereference(8,hr);
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exprasmList.concat(Taicpu.Op_reg_ref(A_MOVQ,S_NO,r,newreference(hr)));
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if not(is_reg_var[r]) then
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begin
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unused:=unused+[r];
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{$ifdef TEMPREGDEBUG}
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inc(usableregmmx);
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{$endif TEMPREGDEBUG}
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end;
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saved[r]:=hr.offset;
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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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testregisters32;
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{$endif TEMPREGDEBUG}
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end;
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procedure popusedregisters(const pushed : tpushed);
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var
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r : tregister;
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{$ifdef SUPPORT_MMX}
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hr : preference;
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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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begin
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if pushed[r] then
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begin
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new(hr);
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reset_reference(hr^);
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hr^.base:=R_ESP;
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exprasmList.concat(Taicpu.Op_ref_reg(
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A_MOVQ,S_NO,hr,r));
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exprasmList.concat(Taicpu.Op_const_reg(
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A_ADD,S_L,8,R_ESP));
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unused:=unused-[r];
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{$ifdef TEMPREGDEBUG}
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dec(usableregmmx);
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{$endif TEMPREGDEBUG}
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end;
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end;
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{$endif SUPPORT_MMX}
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for r:=R_EBX downto R_EAX do
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if pushed[r] then
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begin
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exprasmList.concat(Taicpu.Op_reg(A_POP,S_L,r));
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{$ifdef TEMPREGDEBUG}
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if not (r in unused) 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(usablereg32);
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{$endif TEMPREGDEBUG}
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unused:=unused-[r];
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end;
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{$ifdef TEMPREGDEBUG}
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testregisters32;
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{$endif TEMPREGDEBUG}
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end;
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procedure restoreusedregisters(const saved : tsaved);
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var
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r : tregister;
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hr : treference;
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begin
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{ restore in reverse order: }
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{$ifdef SUPPORT_MMX}
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for r:=R_MM6 downto R_MM0 do
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begin
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if saved[r]<>reg_not_saved then
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begin
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reset_reference(hr);
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hr.base:=frame_pointer;
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hr.offset:=saved[r];
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exprasmList.concat(Taicpu.Op_ref_reg(
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A_MOVQ,S_NO,newreference(hr),r));
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unused:=unused-[r];
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{$ifdef TEMPREGDEBUG}
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dec(usableregmmx);
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{$endif TEMPREGDEBUG}
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ungetiftemp(hr);
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end;
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end;
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{$endif SUPPORT_MMX}
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for r:=R_EBX downto R_EAX do
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if saved[r]<>reg_not_saved then
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begin
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reset_reference(hr);
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hr.base:=frame_pointer;
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hr.offset:=saved[r];
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exprasmList.concat(Taicpu.Op_ref_reg(A_MOV,S_L,newreference(hr),r));
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{$ifdef TEMPREGDEBUG}
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if not (r in unused) then
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internalerror(10)
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else
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dec(usablereg32);
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{$endif TEMPREGDEBUG}
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unused:=unused-[r];
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ungetiftemp(hr);
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end;
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{$ifdef TEMPREGDEBUG}
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testregisters32;
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{$endif TEMPREGDEBUG}
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end;
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procedure ungetregister(r : tregister);
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begin
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if r in [R_EAX,R_ECX,R_EDX,R_EBX,R_ESP,R_EBP,R_ESI,R_EDI] then
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ungetregister32(r)
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else if r in [R_AX,R_CX,R_DX,R_BX,R_SP,R_BP,R_SI,R_DI] then
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ungetregister32(reg16toreg32(r))
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else if r in [R_AL,R_BL,R_CL,R_DL] then
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ungetregister32(reg8toreg32(r))
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{$ifdef SUPPORT_MMX}
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else if r in [R_MM0..R_MM6] then
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ungetregistermmx(r)
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{$endif SUPPORT_MMX}
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else internalerror(18);
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end;
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procedure ungetregister32(r : tregister);
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begin
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if (r = R_EDI) or
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((not assigned(procinfo^._class)) and (r = R_ESI)) then
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begin
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exprasmList.concat(Tairegalloc.DeAlloc(r));
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exit;
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end;
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if cs_regalloc in aktglobalswitches then
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begin
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{ takes much time }
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if not(r in usableregs) then
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exit;
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unused:=unused+[r];
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inc(usablereg32);
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end
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else
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begin
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if not(r in [R_EAX,R_EBX,R_ECX,R_EDX]) then
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exit;
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{$ifdef TEMPREGDEBUG}
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if (r in unused) then
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{$ifdef EXTTEMPREGDEBUG}
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begin
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Comment(V_Debug,'register freed twice '+reg2str(r));
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testregisters32;
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exit;
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end
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{$else EXTTEMPREGDEBUG}
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exit
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{$endif EXTTEMPREGDEBUG}
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else
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{$endif TEMPREGDEBUG}
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inc(usablereg32);
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unused:=unused+[r];
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{$ifdef TEMPREGDEBUG}
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reg_releaser[r]:=curptree^;
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{$endif TEMPREGDEBUG}
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end;
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exprasmList.concat(Tairegalloc.DeAlloc(r));
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{$ifdef TEMPREGDEBUG}
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testregisters32;
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{$endif TEMPREGDEBUG}
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end;
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{$ifdef SUPPORT_MMX}
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function getregistermmx : tregister;
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var
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r : tregister;
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begin
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dec(usableregmmx);
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for r:=R_MM0 to R_MM6 do
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if r in unused then
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begin
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unused:=unused-[r];
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usedinproc:=usedinproc or ($80 shr byte(R_EAX));
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getregistermmx:=r;
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exit;
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end;
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internalerror(10);
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end;
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procedure ungetregistermmx(r : tregister);
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begin
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if cs_regalloc in aktglobalswitches then
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begin
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{ takes much time }
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if not(r in usableregs) then
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exit;
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unused:=unused+[r];
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inc(usableregmmx);
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end
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else
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begin
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unused:=unused+[r];
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inc(usableregmmx);
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end;
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end;
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{$endif SUPPORT_MMX}
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function isaddressregister(reg: tregister): boolean;
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begin
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isaddressregister := true;
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end;
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procedure del_reference(const ref : treference);
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begin
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if ref.is_immediate then
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exit;
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ungetregister32(ref.base);
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ungetregister32(ref.index);
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end;
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procedure del_locref(const location : tlocation);
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begin
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if (location.loc<>loc_mem) and (location.loc<>loc_reference) then
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exit;
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if location.reference.is_immediate then
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exit;
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ungetregister32(location.reference.base);
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ungetregister32(location.reference.index);
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end;
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procedure del_location(const l : tlocation);
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begin
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case l.loc of
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LOC_REGISTER :
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ungetregister(l.register);
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LOC_MEM,LOC_REFERENCE :
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del_reference(l.reference);
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end;
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end;
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{$ifdef TEMPREGDEBUG}
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procedure testregisters32;
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var test : byte;
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begin
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test:=0;
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if R_EAX in unused then
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inc(test);
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if R_EBX in unused then
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inc(test);
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if R_ECX in unused then
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inc(test);
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if R_EDX in unused then
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inc(test);
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if test<>usablereg32 then
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internalerror(10);
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end;
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{$endif TEMPREGDEBUG}
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function getregisterint : tregister;
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begin
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if usablereg32=0 then
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internalerror(10);
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{$ifdef TEMPREGDEBUG}
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if curptree^^.usableregs-usablereg32>curptree^^.registers32 then
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internalerror(10);
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{$endif TEMPREGDEBUG}
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{$ifdef EXTTEMPREGDEBUG}
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if curptree^^.usableregs-usablereg32>curptree^^.reallyusedregs then
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curptree^^.reallyusedregs:=curptree^^.usableregs-usablereg32;
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{$endif EXTTEMPREGDEBUG}
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dec(usablereg32);
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|
if R_EAX in unused then
|
|
begin
|
|
unused:=unused-[R_EAX];
|
|
usedinproc:=usedinproc or ($80 shr byte(R_EAX));
|
|
getregisterint:=R_EAX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_EAX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmList.concat(Tairegalloc.Alloc(R_EAX));
|
|
end
|
|
else if R_EDX in unused then
|
|
begin
|
|
unused:=unused-[R_EDX];
|
|
usedinproc:=usedinproc or ($80 shr byte(R_EDX));
|
|
getregisterint:=R_EDX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_EDX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmList.concat(Tairegalloc.Alloc(R_EDX));
|
|
end
|
|
else if R_EBX in unused then
|
|
begin
|
|
unused:=unused-[R_EBX];
|
|
usedinproc:=usedinproc or ($80 shr byte(R_EBX));
|
|
getregisterint:=R_EBX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_EBX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmList.concat(Tairegalloc.Alloc(R_EBX));
|
|
end
|
|
else if R_ECX in unused then
|
|
begin
|
|
unused:=unused-[R_ECX];
|
|
usedinproc:=usedinproc or ($80 shr byte(R_ECX));
|
|
getregisterint:=R_ECX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_ECX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmList.concat(Tairegalloc.Alloc(R_ECX));
|
|
end
|
|
else internalerror(10);
|
|
{$ifdef TEMPREGDEBUG}
|
|
testregisters32;
|
|
{$endif TEMPREGDEBUG}
|
|
end;
|
|
|
|
|
|
function getaddressregister: tregister;
|
|
|
|
begin
|
|
getaddressregister := getregisterint;
|
|
end;
|
|
|
|
function getexplicitregister32(r : tregister) : tregister;
|
|
|
|
begin
|
|
if r in [R_ESI,R_EDI] then
|
|
begin
|
|
exprasmList.concat(Tairegalloc.Alloc(r));
|
|
getexplicitregister32 := r;
|
|
exit;
|
|
end;
|
|
if r in unused then
|
|
begin
|
|
dec(usablereg32);
|
|
{$ifdef TEMPREGDEBUG}
|
|
if curptree^^.usableregs-usablereg32>curptree^^.registers32 then
|
|
internalerror(10);
|
|
reg_user[r]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
unused:=unused-[r];
|
|
usedinproc:=usedinproc or ($80 shr byte(r));
|
|
exprasmList.concat(Tairegalloc.Alloc(r));
|
|
getexplicitregister32:=r;
|
|
{$ifdef TEMPREGDEBUG}
|
|
testregisters32;
|
|
{$endif TEMPREGDEBUG}
|
|
end
|
|
else
|
|
getexplicitregister32:=getregisterint;
|
|
end;
|
|
|
|
procedure cleartempgen;
|
|
|
|
begin
|
|
unused:=usableregs;
|
|
usablereg32:=c_usableregs;
|
|
{fpuvaroffset:=0;
|
|
this must only be resetted at each procedure
|
|
compilation start PM }
|
|
end;
|
|
|
|
|
|
procedure clearregistercount;
|
|
var
|
|
regi : tregister;
|
|
begin
|
|
{$ifdef SUPPORT_MMX}
|
|
for regi:=R_EAX to R_MM6 do
|
|
begin
|
|
reg_pushes[regi]:=0;
|
|
is_reg_var[regi]:=false;
|
|
end;
|
|
{$else SUPPORT_MMX}
|
|
for regi:=R_EAX to R_EDI do
|
|
begin
|
|
reg_pushes[regi]:=0;
|
|
is_reg_var[regi]:=false;
|
|
end;
|
|
{$endif SUPPORT_MMX}
|
|
end;
|
|
|
|
function correct_fpuregister(r : tregister;ofs : byte) : tregister;
|
|
|
|
begin
|
|
correct_fpuregister:=tregister(longint(r)+ofs);
|
|
end;
|
|
|
|
procedure resetusableregisters;
|
|
begin
|
|
{$ifdef SUPPORT_MMX}
|
|
usableregs:=[R_EAX,R_EBX,R_ECX,R_EDX,R_MM0..R_MM6];
|
|
c_usableregs:=4;
|
|
usableregmmx:=8;
|
|
{$else}
|
|
usableregs:=[R_EAX,R_EBX,R_ECX,R_EDX];
|
|
c_usableregs:=4;
|
|
{$endif SUPPORT_MMX}
|
|
fillchar(regvar_loaded,sizeof(regvar_loaded),false);
|
|
fillchar(is_reg_var,sizeof(is_reg_var),false);
|
|
fpuvaroffset:=0;
|
|
end;
|
|
|
|
begin
|
|
resetusableregisters;
|
|
end.
|
|
{
|
|
$Log$
|
|
Revision 1.2 2002-09-07 15:25:15 peter
|
|
* old logs removed and tabs fixed
|
|
|
|
Revision 1.1 2002/08/22 08:30:50 mazen
|
|
first insertion 2002\08\22
|
|
|
|
}
|