mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-05-02 10:13:42 +02:00
339 lines
11 KiB
ObjectPascal
339 lines
11 KiB
ObjectPascal
{*****************************************************************************}
|
|
{ File : rgcpu.pas }
|
|
{ Author : Mazen NEIFER }
|
|
{ Project : Free Pascal Compiler (FPC) }
|
|
{ Creation date : 2002\26\26 }
|
|
{ Last modification date : 2002\08\20 }
|
|
{ Licence : GPL }
|
|
{ Bug report : mazen.neifer.01@supaero.org }
|
|
{*****************************************************************************}
|
|
{
|
|
$Id$
|
|
Copyright (c) 1998-2002 by Florian Klaempfl
|
|
|
|
This unit implements the i386 specific class for the register
|
|
allocator
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
****************************************************************************
|
|
}
|
|
|
|
unit rgcpu;
|
|
|
|
{$INCLUDE fpcdefs.inc}
|
|
|
|
interface
|
|
|
|
uses
|
|
cpubase,
|
|
cpuinfo,
|
|
aasmcpu,
|
|
aasmtai,
|
|
cclasses,globtype,cgbase,aasmbase,rgobj;
|
|
|
|
type
|
|
trgcpu = class(trgobj)
|
|
|
|
{ to keep the same allocation order as with the old routines }
|
|
function getregisterint(list: taasmoutput): tregister; override;
|
|
procedure ungetregisterint(list: taasmoutput; r : tregister); override;
|
|
function getexplicitregisterint(list: taasmoutput; r : tregister) : tregister; override;
|
|
|
|
function getregisterfpu(list: taasmoutput) : tregister; override;
|
|
procedure ungetregisterfpu(list: taasmoutput; r : tregister); override;
|
|
|
|
procedure ungetreference(list: taasmoutput; const ref : treference); override;
|
|
|
|
{ pushes and restores registers }
|
|
procedure pushusedregisters(list: taasmoutput;
|
|
var pushed : tpushedsaved;const s: tregisterset);
|
|
procedure popusedregisters(list: taasmoutput;
|
|
const pushed : tpushedsaved);
|
|
|
|
procedure resetusableregisters;override;
|
|
|
|
{ corrects the fpu stack register by ofs }
|
|
function correct_fpuregister(r : tregister;ofs : byte) : tregister;
|
|
|
|
fpuvaroffset : byte;
|
|
end;
|
|
|
|
|
|
implementation
|
|
|
|
uses
|
|
systems,
|
|
globals,verbose,node,
|
|
cgobj,tgobj,cga;
|
|
|
|
|
|
function trgcpu.getregisterint(list: taasmoutput): tregister;
|
|
begin
|
|
if countunusedregsint=0 then
|
|
internalerror(10);(*
|
|
{$ifdef TEMPREGDEBUG}
|
|
if curptree^.usableregsint-countunusedregsint>curptree^.registers32 then
|
|
internalerror(10);
|
|
{$endif TEMPREGDEBUG}
|
|
{$ifdef EXTTEMPREGDEBUG}
|
|
if curptree^.usableregs-countunusedregistersint>curptree^^.reallyusedregs then
|
|
curptree^.reallyusedregs:=curptree^^.usableregs-countunusedregistersint;
|
|
{$endif EXTTEMPREGDEBUG}
|
|
dec(countunusedregsint);
|
|
if R_EAX in unusedregsint then
|
|
begin
|
|
exclude(unusedregsint,R_EAX);
|
|
include(usedinproc,R_EAX);
|
|
getregisterint:=R_EAX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_EAX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmlist.concat(tairegalloc.alloc(R_EAX));
|
|
end
|
|
else if R_EDX in unusedregsint then
|
|
begin
|
|
exclude(unusedregsint,R_EDX);
|
|
include(usedinproc,R_EDX);
|
|
getregisterint:=R_EDX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_EDX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmlist.concat(tairegalloc.alloc(R_EDX));
|
|
end
|
|
else if R_EBX in unusedregsint then
|
|
begin
|
|
exclude(unusedregsint,R_EBX);
|
|
include(usedinproc,R_EBX);
|
|
getregisterint:=R_EBX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_EBX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmlist.concat(tairegalloc.alloc(R_EBX));
|
|
end
|
|
else if R_ECX in unusedregsint then
|
|
begin
|
|
exclude(unusedregsint,R_ECX);
|
|
include(usedinproc,R_ECX);
|
|
getregisterint:=R_ECX;
|
|
{$ifdef TEMPREGDEBUG}
|
|
reg_user[R_ECX]:=curptree^;
|
|
{$endif TEMPREGDEBUG}
|
|
exprasmlist.concat(tairegalloc.alloc(R_ECX));
|
|
end
|
|
else internalerror(10);
|
|
{$ifdef TEMPREGDEBUG}
|
|
testregisters;
|
|
{$endif TEMPREGDEBUG}*)
|
|
end;
|
|
|
|
procedure trgcpu.ungetregisterint(list: taasmoutput; r : tregister);
|
|
begin
|
|
{ if (r = R_EDI) or
|
|
((not assigned(procinfo^._class)) and (r = R_ESI)) then
|
|
begin
|
|
list.concat(Tairegalloc.DeAlloc(r));
|
|
exit;
|
|
end;
|
|
if not(r in [R_EAX,R_EBX,R_ECX,R_EDX]) then
|
|
exit;
|
|
inherited ungetregisterint(list,r);}
|
|
end;
|
|
|
|
|
|
function trgcpu.getexplicitregisterint(list: taasmoutput; r : tregister) : tregister;
|
|
begin
|
|
{ if r in [R_ESI,R_EDI] then
|
|
begin
|
|
list.concat(Tairegalloc.Alloc(r));
|
|
getexplicitregisterint := r;
|
|
exit;
|
|
end;}
|
|
result := inherited getexplicitregisterint(list,r);
|
|
end;
|
|
|
|
|
|
function trgcpu.getregisterfpu(list: taasmoutput) : tregister;
|
|
|
|
begin
|
|
{ note: don't return R_ST0, see comments above implementation of }
|
|
{ a_loadfpu_* methods in cgcpu (JM) }
|
|
// result := R_ST;
|
|
end;
|
|
|
|
|
|
procedure trgcpu.ungetregisterfpu(list : taasmoutput; r : tregister);
|
|
|
|
begin
|
|
{ nothing to do, fpu stack management is handled by the load/ }
|
|
{ store operations in cgcpu (JM) }
|
|
end;
|
|
|
|
|
|
procedure trgcpu.ungetreference(list: taasmoutput; const ref : treference);
|
|
|
|
begin
|
|
ungetregisterint(list,ref.base);
|
|
ungetregisterint(list,ref.index);
|
|
end;
|
|
|
|
|
|
procedure trgcpu.pushusedregisters(list: taasmoutput;
|
|
var pushed : tpushedsaved; const s: tregisterset);
|
|
|
|
var
|
|
r: tregister;
|
|
hr: treference;
|
|
begin
|
|
usedinproc:=usedinproc + s;
|
|
(* for r:=R_EAX to R_EBX do
|
|
begin
|
|
pushed[r].pushed:=false;
|
|
{ if the register is used by the calling subroutine }
|
|
if not is_reg_var[r] and
|
|
(r in s) and
|
|
{ and is present in use }
|
|
not(r in unusedregsint) then
|
|
begin
|
|
{ then save it }
|
|
list.concat(Taicpu.Op_reg(A_PUSH,S_L,r));
|
|
include(unusedregsint,r);
|
|
inc(countunusedregsint);
|
|
pushed[r].pushed:=true;
|
|
end;
|
|
end;*)
|
|
{$ifdef SUPPORT_MMX}
|
|
(*for r:=R_MM0 to R_MM6 do
|
|
begin
|
|
pushed[r].pushed:=false;
|
|
{ if the register is used by the calling subroutine }
|
|
if not is_reg_var[r] and
|
|
(r in s) and
|
|
{ and is present in use }
|
|
not(r in unusedregsmm) then
|
|
begin
|
|
list.concat(Taicpu.Op_const_reg(A_SUB,S_L,8,R_ESP));
|
|
reference_reset_base(hr,R_ESP,0);
|
|
list.concat(Taicpu.Op_reg_ref(A_MOVQ,S_NO,r,hr));
|
|
include(unusedregsmm,r);
|
|
inc(countunusedregsmm);
|
|
pushed[r].pushed:=true;
|
|
end;
|
|
end;*)
|
|
{$endif SUPPORT_MMX}
|
|
{$ifdef TEMPREGDEBUG}
|
|
testregisters;
|
|
{$endif TEMPREGDEBUG}
|
|
end;
|
|
|
|
|
|
procedure trgcpu.popusedregisters(list: taasmoutput;
|
|
const pushed : tpushedsaved);
|
|
|
|
var
|
|
r : tregister;
|
|
{$ifdef SUPPORT_MMX}
|
|
hr : treference;
|
|
{$endif SUPPORT_MMX}
|
|
begin
|
|
{ restore in reverse order: }
|
|
{$ifdef SUPPORT_MMX}
|
|
for r:=R_MM6 downto R_MM0 do
|
|
if pushed[r].pushed then
|
|
begin
|
|
reference_reset_base(hr,R_ESP,0);
|
|
list.concat(Taicpu.Op_ref_reg(
|
|
A_MOVQ,S_NO,hr,r));
|
|
list.concat(Taicpu.Op_const_reg(
|
|
A_ADD,S_L,8,R_ESP));
|
|
if not (r in unusedregsmm) then
|
|
{ internalerror(10)
|
|
in cg386cal we always restore regs
|
|
that appear as used
|
|
due to a unused tmep storage PM }
|
|
else
|
|
dec(countunusedregsmm);
|
|
exclude(unusedregsmm,r);
|
|
end;
|
|
{$endif SUPPORT_MMX}
|
|
(* for r:=R_EBX downto R_EAX do
|
|
if pushed[r].pushed then
|
|
begin
|
|
list.concat(Taicpu.Op_reg(A_POP,S_L,r));
|
|
if not (r in unusedregsint) then
|
|
{ internalerror(10)
|
|
in cg386cal we always restore regs
|
|
that appear as used
|
|
due to a unused tmep storage PM }
|
|
else
|
|
dec(countunusedregsint);
|
|
exclude(unusedregsint,r);
|
|
end;*)
|
|
{$ifdef TEMPREGDEBUG}
|
|
testregisters;
|
|
{$endif TEMPREGDEBUG}
|
|
end;
|
|
|
|
procedure trgcpu.resetusableregisters;
|
|
|
|
begin
|
|
inherited resetusableregisters;
|
|
fpuvaroffset := 0;
|
|
end;
|
|
|
|
|
|
function trgcpu.correct_fpuregister(r : tregister;ofs : byte) : tregister;
|
|
|
|
begin
|
|
correct_fpuregister:=tregister(longint(r)+ofs);
|
|
end;
|
|
|
|
|
|
initialization
|
|
rg := trgcpu.create;
|
|
end.
|
|
|
|
{
|
|
$Log$
|
|
Revision 1.1 2002-08-21 13:30:07 mazen
|
|
*** empty log message ***
|
|
|
|
Revision 1.2 2002/04/02 17:11:39 peter
|
|
* tlocation,treference update
|
|
* LOC_CONSTANT added for better constant handling
|
|
* secondadd splitted in multiple routines
|
|
* location_force_reg added for loading a location to a register
|
|
of a specified size
|
|
* secondassignment parses now first the right and then the left node
|
|
(this is compatible with Kylix). This saves a lot of push/pop especially
|
|
with string operations
|
|
* adapted some routines to use the new cg methods
|
|
|
|
Revision 1.1 2002/03/31 20:26:40 jonas
|
|
+ a_loadfpu_* and a_loadmm_* methods in tcg
|
|
* register allocation is now handled by a class and is mostly processor
|
|
independent (+rgobj.pas and i386/rgcpu.pas)
|
|
* temp allocation is now handled by a class (+tgobj.pas, -i386\tgcpu.pas)
|
|
* some small improvements and fixes to the optimizer
|
|
* some register allocation fixes
|
|
* some fpuvaroffset fixes in the unary minus node
|
|
* fixed and optimized register saving/restoring for new/dispose nodes
|
|
* LOC_FPU locations now also require their "register" field to be set to
|
|
R_ST, not R_ST0 (the latter is used for LOC_CFPUREGISTER locations only)
|
|
- list field removed of the tnode class because it's not used currently
|
|
and can cause hard-to-find bugs
|
|
|
|
}
|