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https://gitlab.com/freepascal.org/fpc/source.git
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400 lines
11 KiB
ObjectPascal
400 lines
11 KiB
ObjectPascal
{
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$Id$
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Copyright (C) 2000 by Florian Klaempfl
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This unit handles the temporary variables stuff for iA64
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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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{$i defines.inc}
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interface
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uses
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cobjects,globals,
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hcodegen,verbose,aasm,
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node,
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cpuinfo,cpubase,cpuasm;
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const
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{ this is iA64 specific }
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countusableregqp : byte = c_countusableregsqp;
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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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type
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tpushed = array[R_NO..R_NO] of boolean;
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tsaved = array[R_NO..R_NO] of longint;
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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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function getregisterint : tregister;
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procedure ungetregisterint(r : tregister);
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{ tries to allocate the passed register, if possible }
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function getexplicitregisterint(r : tregister) : tregister;
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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 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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type
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regvar_longintarray = array[0..128+128+64-1] of longint;
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regvar_booleanarray = array[0..128+128+64-1] of boolean;
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regvar_ptreearray = array[0..128+128+64-1] of tnode;
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var
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unused,usableregs : tregisterset;
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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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{ 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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implementation
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uses
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globtype,temp_gen;
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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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{!!!!!!!!
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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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}
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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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begin
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{!!!!!!!!
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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(r in unused) then
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begin
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{ then save it }
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exprasmlist^.concat(new(paicpu,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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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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}
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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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{!!!!!!!
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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(new(paicpu,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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end;
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end;
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end;
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end;
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}
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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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begin
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{!!!!!!!
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{ restore in reverse order: }
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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(new(paicpu,op_reg(A_POP,S_L,r)));
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unused:=unused-[r];
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end;
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}
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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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{
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{ restore in reverse order: }
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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(new(paicpu,op_ref_reg(A_MOV,S_L,newreference(hr),r)));
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unused:=unused-[r];
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ungetiftemp(hr);
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end;
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}
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end;
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procedure ungetregister(r : tregister);
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begin
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{
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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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else internalerror(18);
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}
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end;
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procedure ungetregisterint(r : tregister);
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begin
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{
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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(new(pairegalloc,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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inc(usablereg32);
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unused:=unused+[r];
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end;
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exprasmlist^.concat(new(pairegalloc,dealloc(r)));
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}
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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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ungetregisterint(ref.base);
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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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ungetregisterint(location.reference.base);
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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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function getregisterint : tregister;
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begin
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{
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if usableregint=0 then
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internalerror(10);
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dec(usableregint);
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if R_EAX in unused then
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begin
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unused:=unused-[R_EAX];
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usedinproc:=usedinproc or ($80 shr byte(R_EAX));
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getregister32:=R_EAX;
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exprasmlist^.concat(new(pairegalloc,alloc(R_EAX)));
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end
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else if R_EDX in unused then
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begin
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unused:=unused-[R_EDX];
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usedinproc:=usedinproc or ($80 shr byte(R_EDX));
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getregister32:=R_EDX;
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exprasmlist^.concat(new(pairegalloc,alloc(R_EDX)));
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end
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else if R_EBX in unused then
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begin
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unused:=unused-[R_EBX];
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usedinproc:=usedinproc or ($80 shr byte(R_EBX));
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getregister32:=R_EBX;
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exprasmlist^.concat(new(pairegalloc,alloc(R_EBX)));
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end
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else if R_ECX in unused then
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begin
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unused:=unused-[R_ECX];
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usedinproc:=usedinproc or ($80 shr byte(R_ECX));
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getregister32:=R_ECX;
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exprasmlist^.concat(new(pairegalloc,alloc(R_ECX)));
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end
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else internalerror(10);
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}
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end;
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function getexplicitregisterint(r : tregister) : tregister;
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begin
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{
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if r in [R_ESI,R_EDI] then
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begin
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exprasmlist^.concat(new(pairegalloc,alloc(r)));
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getexplicitregister32 := r;
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exit;
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end;
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if r in unused then
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begin
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dec(usablereg32);
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unused:=unused-[r];
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usedinproc:=usedinproc or ($80 shr byte(r));
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exprasmlist^.concat(new(pairegalloc,alloc(r)));
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getexplicitregister32:=r;
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end
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else
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getexplicitregister32:=getregister32;
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}
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end;
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procedure cleartempgen;
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begin
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unused:=usableregs;
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countusableregint:=c_countusableregsint;
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countusableregfpu:=c_countusableregsfpu;
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countusableregqp:=c_countusableregsqp;
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end;
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procedure clearregistercount;
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var
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regi : tregister;
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begin
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{
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for regi:=R_EAX to R_EDI do
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begin
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reg_pushes[regi]:=0;
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is_reg_var[regi]:=false;
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end;
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}
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end;
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procedure resetusableregisters;
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begin
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{
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usableregs:=[R_EAX,R_EBX,R_ECX,R_EDX];
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c_usableregs:=4;
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}
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end;
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begin
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resetusableregisters;
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end.
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{
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$Log$
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Revision 1.1 2000-12-31 16:54:19 florian
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+ initial revision
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}
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