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fpc/compiler/rgobj.pas
peter c4ddcc78a8 * generic constructor working for i386 
* remove fixed self register
  * esi added as address register for i386
2003-03-28 19:16:56 +00:00

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{
$Id$
Copyright (c) 1998-2002 by Florian Klaempfl
This unit implements the base 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.
****************************************************************************
}
{$i fpcdefs.inc}
{# @abstract(Abstract register allocator unit)
This unit contains services to allocate, free
references and registers which are used by
the code generator.
}
{*******************************************************************************
(applies to new register allocator)
Register allocator introduction.
Free Pascal uses a Chaitin style register allocator similair to the one
described in the book "Modern compiler implementation in C" by Andrew W. Appel.,
published by Cambridge University Press.
Reading this book is recommended for a complete understanding. Here is a small
introduction.
The code generator thinks it has an infinite amount of registers. Our processor
has a limited amount of registers. Therefore we must reduce the amount of
registers until there are less enough to fit into the processors registers.
Registers can interfere or not interfere. If two imaginary registers interfere
they cannot be placed into the same psysical register. Reduction of registers
is done by:
- "coalescing" Two registers that do not interfere are combined
into one register.
- "spilling" A register is changed into a memory location and the generated
code is modified to use the memory location instead of the register.
Register allocation is a graph colouring problem. Each register is a colour, and
if two registers interfere there is a connection between them in the graph.
In addition to the imaginary registers in the code generator, the psysical
CPU registers are also present in this graph. This allows us to make
interferences between imaginary registers and cpu registers. This is very
usefull for describing archtectural constrains, like for example that
the div instruction modifies edx, so variables that are in use at that time
cannot be stored into edx. This can be modelled by making edx interfere
with those variables.
*******************************************************************************}
unit rgobj;
interface
uses
cutils, cpubase,
cpuinfo,
aasmbase,aasmtai,aasmcpu,
cclasses,globtype,cginfo,cgbase,node
{$ifdef delphi}
,dmisc
{$endif}
;
type
regvar_longintarray = array[firstreg..lastreg] of longint;
regvarint_longintarray = array[first_supreg..last_supreg] of longint;
regvar_booleanarray = array[firstreg..lastreg] of boolean;
regvar_ptreearray = array[firstreg..lastreg] of tnode;
tpushedsavedloc = record
case byte of
0: (pushed: boolean);
1: (ofs: longint);
end;
tpushedsaved = array[firstreg..lastreg] of tpushedsavedloc;
Tpushedsavedint = array[first_supreg..last_supreg] of Tpushedsavedloc;
Tinterferencebitmap=array[Tsuperregister] of set of Tsuperregister;
Tinterferenceadjlist=array[Tsuperregister] of Pstring;
Tinterferencegraph=record
bitmap:Tinterferencebitmap;
adjlist:Tinterferenceadjlist;
end;
Pinterferencegraph=^Tinterferencegraph;
{#
This class implements the abstract register allocator
It is used by the code generator to allocate and free
registers which might be valid across nodes. It also
contains utility routines related to registers.
Some of the methods in this class should be overriden
by cpu-specific implementations.
}
trgobj = class
{ The "usableregsxxx" contain all registers of type "xxx" that }
{ aren't currently allocated to a regvar. The "unusedregsxxx" }
{ contain all registers of type "xxx" that aren't currenly }
{ allocated }
lastintreg:Tsuperregister;
unusedregsint,usableregsint:Tsupregset;
unusedregsfpu,usableregsfpu : tregisterset;
unusedregsmm,usableregsmm : tregisterset;
{ these counters contain the number of elements in the }
{ unusedregsxxx/usableregsxxx sets }
countunusedregsint,
countunusedregsfpu,
countunusedregsmm : byte;
countusableregsint,
countusableregsfpu,
countusableregsmm : byte;
{ Contains the registers which are really used by the proc itself.
It doesn't take care of registers used by called procedures
}
usedbyproc,
usedinproc : tregisterset;
usedintbyproc,usedintinproc:Tsupregset;
reg_pushes : regvar_longintarray;
reg_pushes_int : regvarint_longintarray;
is_reg_var : regvar_booleanarray;
is_reg_var_int:Tsupregset;
regvar_loaded: regvar_booleanarray;
regvar_loaded_int: Tsupregset;
{ tries to hold the amount of times which the current tree is processed }
t_times: longint;
constructor create;
{# Allocate a general purpose register
An internalerror will be generated if there
is no more free registers which can be allocated
}
function getregisterint(list:Taasmoutput;size:Tcgsize):Tregister;virtual;
{# Free a general purpose register
@param(r register to free)
}
procedure ungetregisterint(list: taasmoutput; r : tregister); virtual;
{# Allocate a floating point register
An internalerror will be generated if there
is no more free registers which can be allocated
}
function getregisterfpu(list: taasmoutput) : tregister; virtual;
{# Free a floating point register
@param(r register to free)
}
procedure ungetregisterfpu(list: taasmoutput; r : tregister); virtual;
function getregistermm(list: taasmoutput) : tregister; virtual;
procedure ungetregistermm(list: taasmoutput; r : tregister); virtual;
{# Allocate an address register.
Address registers are the only registers which can
be used as a base register in references (treference).
On most cpu's this is the same as a general purpose
register.
An internalerror will be generated if there
is no more free registers which can be allocated
}
function getaddressregister(list:Taasmoutput):Tregister;virtual;
procedure ungetaddressregister(list: taasmoutput; r: tregister); virtual;
{# Verify if the specified register is an address or
general purpose register. Returns TRUE if @var(reg)
is an adress register.
This routine should only be used to check on
general purpose or address register. It will
not work on multimedia or floating point
registers
@param(reg register to verify)
}
function isaddressregister(reg: tregister): boolean; virtual;
{# Tries to allocate the passed register, if possible
@param(r specific register to allocate)
}
function getexplicitregisterint(list:Taasmoutput;r:Tnewregister):Tregister;virtual;
{# Tries to allocate the passed fpu register, if possible
@param(r specific register to allocate)
}
function getexplicitregisterfpu(list : taasmoutput; r : Toldregister) : tregister;
{# Deallocate any kind of register }
procedure ungetregister(list: taasmoutput; r : tregister); virtual;
{# Deallocate all registers which are allocated
in the specified reference. On most systems,
this will free the base and index registers
of the specified reference.
@param(ref reference which must have its registers freed)
}
procedure ungetreference(list: taasmoutput; const ref : treference); virtual;
{# Reset the register allocator information (usable registers etc) }
procedure cleartempgen;virtual;
{# Convert a register to a specified register size, and return that register size }
function makeregsize(reg: tregister; size: tcgsize): tregister; virtual;
{# saves register variables (restoring happens automatically) }
procedure saveintregvars(list:Taasmoutput;const s:Tsupregset);
procedure saveotherregvars(list:Taasmoutput;const s:Tregisterset);
{# Saves in temporary references (allocated via the temp. allocator)
the registers defined in @var(s). The registers are only saved
if they are currently in use, otherwise they are left as is.
On processors which have instructions which manipulate the stack,
this routine should be overriden for performance reasons.
@param(list) List to add the instruction to
@param(saved) Array of saved register information
@param(s) Registers which might require saving
}
procedure saveusedintregisters(list:Taasmoutput;
var saved:Tpushedsavedint;
const s:Tsupregset);virtual;
procedure saveusedotherregisters(list:Taasmoutput;
var saved:Tpushedsaved;
const s:Tregisterset);virtual;
{# Restores the registers which were saved with a call
to @var(saveusedregisters).
On processors which have instructions which manipulate the stack,
this routine should be overriden for performance reasons.
}
procedure restoreusedintregisters(list:Taasmoutput;
const saved:Tpushedsavedint);virtual;
procedure restoreusedotherregisters(list:Taasmoutput;
const saved:Tpushedsaved);virtual;
{ used when deciding which registers to use for regvars }
procedure incrementintregisterpushed(const s:Tsupregset);
procedure incrementotherregisterpushed(const s: tregisterset);
procedure clearregistercount;
procedure resetusableregisters;virtual;
procedure makeregvarint(reg:Tnewregister);
procedure makeregvarother(reg:Tregister);
procedure saveStateForInline(var state: pointer);virtual;
procedure restoreStateAfterInline(var state: pointer);virtual;
procedure saveUnusedState(var state: pointer);virtual;
procedure restoreUnusedState(var state: pointer);virtual;
protected
{$ifdef newra}
igraph:Tinterferencegraph;
{$endif}
{ the following two contain the common (generic) code for all }
{ get- and ungetregisterxxx functions/procedures }
function getregistergen(list: taasmoutput; const lowreg, highreg: Toldregister;
var unusedregs:Tregisterset; var countunusedregs: byte): tregister;
function getregistergenint(list:Taasmoutput;subreg:Tsubregister;
const lowreg,highreg:Tsuperregister;
var fusedinproc,fusedbyproc,unusedregs:Tsupregset;
var countunusedregs:byte):Tregister;
procedure ungetregistergen(list: taasmoutput; const r: tregister;
const usableregs: tregisterset; var unusedregs: tregisterset; var countunusedregs: byte);
procedure ungetregistergenint(list:taasmoutput;const r:Tregister;
const usableregs:Tsupregset;
var unusedregs:Tsupregset;
var countunusedregs:byte);
{$ifdef TEMPREGDEBUG}
reg_user : regvar_ptreearray;
reg_releaser : regvar_ptreearray;
{$endif TEMPREGDEBUG}
{$ifdef TEMPREGDEBUG}
procedure testregisters;
{$endif TEMPREGDEBUGx}
{$ifdef newra}
procedure add_edge(u,v:Tsuperregister);
procedure add_edges_used(u:Tsuperregister);
{$endif}
end;
const
{# This value is used in tsaved. If the array value is equal
to this, then this means that this register is not used.
}
reg_not_saved = $7fffffff;
var
{# This is the class instance used to access the register allocator class }
rg: trgobj;
{ trerefence handling }
{# Clear to zero a treference }
procedure reference_reset(var ref : treference);
procedure reference_reset_old(var ref : treference);
{# Clear to zero a treference, and set is base address
to base register.
}
procedure reference_reset_base(var ref : treference;base : tregister;offset : longint);
procedure reference_reset_symbol(var ref : treference;sym : tasmsymbol;offset : longint);
procedure reference_release(list: taasmoutput; const ref : treference);
{ This routine verifies if two references are the same, and
if so, returns TRUE, otherwise returns false.
}
function references_equal(sref : treference;dref : treference) : boolean;
{ tlocation handling }
procedure location_reset(var l : tlocation;lt:TLoc;lsize:TCGSize);
procedure location_release(list: taasmoutput; const l : tlocation);
procedure location_freetemp(list: taasmoutput; const l : tlocation);
procedure location_copy(var destloc,sourceloc : tlocation);
procedure location_swap(var destloc,sourceloc : tlocation);
type
psavedstate = ^tsavedstate;
tsavedstate = record
unusedregsint,usableregsint : Tsupregset;
unusedregsaddr,usableregsaddr : Tsupregset;
unusedregsfpu,usableregsfpu : tregisterset;
unusedregsmm,usableregsmm : tregisterset;
countunusedregsint,
countunusedregsaddr,
countunusedregsfpu,
countunusedregsmm : byte;
countusableregsint,
countusableregsfpu,
countusableregsmm : byte;
{ contains the registers which are really used by the proc itself }
usedbyproc,
usedinproc : tregisterset;
reg_pushes : regvar_longintarray;
is_reg_var : regvar_booleanarray;
is_reg_var_int : Tsupregset;
regvar_loaded: regvar_booleanarray;
regvar_loaded_int: Tsupregset;
{$ifdef TEMPREGDEBUG}
reg_user : regvar_ptreearray;
reg_releaser : regvar_ptreearray;
{$endif TEMPREGDEBUG}
end;
punusedstate = ^tunusedstate;
tunusedstate = record
unusedregsint : Tsupregset;
unusedregsaddr : Tsupregset;
unusedregsfpu : tregisterset;
unusedregsmm : tregisterset;
countunusedregsint,
countunusedregsaddr,
countunusedregsfpu,
countunusedregsmm : byte;
end;
implementation
uses
systems,
globals,verbose,
cgobj,tgobj,regvars;
constructor trgobj.create;
begin
usedinproc := [];
usedbyproc:=[];
t_times := 0;
resetusableregisters;
lastintreg:=0;
{$ifdef TEMPREGDEBUG}
fillchar(reg_user,sizeof(reg_user),0);
fillchar(reg_releaser,sizeof(reg_releaser),0);
{$endif TEMPREGDEBUG}
{$ifdef newra}
fillchar(igraph,sizeof(igraph),0);
{$endif}
end;
function trgobj.getregistergen(list: taasmoutput; const lowreg, highreg: Toldregister;
var unusedregs: tregisterset; var countunusedregs: byte): tregister;
var
i: Toldregister;
r: Tregister;
begin
for i:=lowreg to highreg do
begin
if i in unusedregs then
begin
exclude(unusedregs,i);
include(usedinproc,i);
include(usedbyproc,i);
dec(countunusedregs);
r.enum:=i;
list.concat(tai_regalloc.alloc(r));
result := r;
exit;
end;
end;
internalerror(10);
end;
function Trgobj.getregistergenint(list:Taasmoutput;
subreg:Tsubregister;
const lowreg,highreg:Tsuperregister;
var fusedinproc,fusedbyproc,unusedregs:Tsupregset;
var countunusedregs:byte):Tregister;
var i:Tsuperregister;
r:Tregister;
begin
if not (lastintreg in [lowreg..highreg]) then
lastintreg:=lowreg;
i:=lastintreg;
repeat
if i=highreg then
i:=lowreg
else
inc(i);
if i in unusedregs then
begin
exclude(unusedregs,i);
include(fusedinproc,i);
include(fusedbyproc,i);
dec(countunusedregs);
r.enum:=R_INTREGISTER;
r.number:=i shl 8 or subreg;
list.concat(Tai_regalloc.alloc(r));
result:=r;
lastintreg:=i;
{$ifdef newra}
add_edges_used(i);
{$endif}
exit;
end;
until i=lastintreg;
internalerror(10);
end;
procedure trgobj.ungetregistergen(list: taasmoutput; const r: tregister;
const usableregs: tregisterset; var unusedregs: tregisterset; var countunusedregs: byte);
begin
if r.enum>lastreg then
internalerror(2003010801);
{ takes much time }
if not(r.enum in usableregs) then
exit;
{$ifdef TEMPREGDEBUG}
if (r.enum in unusedregs) then
{$ifdef EXTTEMPREGDEBUG}
begin
Comment(V_Debug,'register freed twice '+std_reg2str[r.enum]);
testregisters32;
exit;
end
{$else EXTTEMPREGDEBUG}
exit
{$endif EXTTEMPREGDEBUG}
else
{$endif TEMPREGDEBUG}
inc(countunusedregs);
include(unusedregs,r.enum);
list.concat(tai_regalloc.dealloc(r));
end;
procedure trgobj.ungetregistergenint(list:taasmoutput;const r:Tregister;
const usableregs:Tsupregset;
var unusedregs:Tsupregset;
var countunusedregs:byte);
var supreg:Tsuperregister;
begin
if r.enum<=lastreg then
internalerror(2003010803);
supreg:=r.number shr 8;
{ takes much time }
{$ifndef newra}
if not(supreg in usableregs) then
exit;
{$endif}
{$ifdef TEMPREGDEBUG}
if (supreg in unusedregs) then
{$ifdef EXTTEMPREGDEBUG}
begin
comment(v_debug,'register freed twice '+supreg_name(supreg));
testregisters32;
exit;
end
{$else EXTTEMPREGDEBUG}
exit
{$endif EXTTEMPREGDEBUG}
else
{$endif TEMPREGDEBUG}
inc(countunusedregs);
include(unusedregs,supreg);
list.concat(tai_regalloc.dealloc(r));
end;
function trgobj.getregisterint(list:taasmoutput;size:Tcgsize):Tregister;
var subreg:Tsubregister;
begin
if countunusedregsint=0 then
internalerror(10);
{$ifdef TEMPREGDEBUG}
if curptree^^.usableregs-countunusedregsint>curptree^^.registers32 then
internalerror(10);
{$endif TEMPREGDEBUG}
{$ifdef EXTTEMPREGDEBUG}
if curptree^^.usableregs-countunusedregsint>curptree^^.reallyusedregs then
curptree^^.reallyusedregs:=curptree^^.usableregs-countunusedregsint;
{$endif EXTTEMPREGDEBUG}
subreg:=cgsize2subreg(size);
result:=getregistergenint(list,
subreg,
{$ifdef newra}
first_imreg,
last_imreg,
{$else}
first_supreg,
last_supreg,
{$endif}
usedintbyproc,
usedintinproc,
unusedregsint,
countunusedregsint);
{$ifdef TEMPREGDEBUG}
reg_user[result]:=curptree^;
testregisters32;
{$endif TEMPREGDEBUG}
end;
procedure trgobj.ungetregisterint(list : taasmoutput; r : tregister);
begin
ungetregistergenint(list,r,usableregsint,unusedregsint,
countunusedregsint);
{$ifdef TEMPREGDEBUG}
reg_releaser[r]:=curptree^;
testregisters32;
{$endif TEMPREGDEBUG}
end;
{ tries to allocate the passed register, if possible }
function trgobj.getexplicitregisterint(list:Taasmoutput;r:Tnewregister):Tregister;
var r2:Tregister;
begin
if (r shr 8) in unusedregsint then
begin
dec(countunusedregsint);
{$ifdef TEMPREGDEBUG}
if curptree^^.usableregs-countunusedregsint>curptree^^.registers32 then
internalerror(10);
reg_user[r shr 8]:=curptree^;
{$endif TEMPREGDEBUG}
exclude(unusedregsint,r shr 8);
include(usedintinproc,r shr 8);
include(usedintbyproc,r shr 8);
r2.enum:=R_INTREGISTER;
r2.number:=r;
list.concat(tai_regalloc.alloc(r2));
{$ifdef TEMPREGDEBUG}
testregisters32;
{$endif TEMPREGDEBUG}
end
else
internalerror(200301103);
getexplicitregisterint:=r2;
end;
{ tries to allocate the passed register, if possible }
function trgobj.getexplicitregisterfpu(list : taasmoutput; r : Toldregister) : tregister;
var r2:Tregister;
begin
if r in unusedregsfpu then
begin
dec(countunusedregsfpu);
{$ifdef TEMPREGDEBUG}
if curptree^^.usableregs-countunusedregsint>curptree^^.registers32 then
internalerror(10);
reg_user[r]:=curptree^;
{$endif TEMPREGDEBUG}
exclude(unusedregsfpu,r);
include(usedinproc,r);
include(usedbyproc,r);
r2.enum:=r;
list.concat(tai_regalloc.alloc(r2));
getexplicitregisterfpu:=r2;
{$ifdef TEMPREGDEBUG}
testregisters32;
{$endif TEMPREGDEBUG}
end
else
getexplicitregisterfpu:=getregisterfpu(list);
end;
function trgobj.getregisterfpu(list: taasmoutput) : tregister;
begin
if countunusedregsfpu=0 then
internalerror(10);
result := getregistergen(list,firstsavefpureg,lastsavefpureg,
unusedregsfpu,countunusedregsfpu);
end;
procedure trgobj.ungetregisterfpu(list : taasmoutput; r : tregister);
begin
ungetregistergen(list,r,usableregsfpu,unusedregsfpu,
countunusedregsfpu);
end;
function trgobj.getregistermm(list: taasmoutput) : tregister;
begin
if countunusedregsmm=0 then
internalerror(10);
result := getregistergen(list,firstsavemmreg,lastsavemmreg,
unusedregsmm,countunusedregsmm);
end;
procedure trgobj.ungetregistermm(list: taasmoutput; r: tregister);
begin
ungetregistergen(list,r,usableregsmm,unusedregsmm,
countunusedregsmm);
end;
function trgobj.getaddressregister(list:Taasmoutput): tregister;
begin
{An address register is OS_INT per definition.}
result := getregisterint(list,OS_INT);
end;
procedure trgobj.ungetaddressregister(list: taasmoutput; r: tregister);
begin
ungetregisterint(list,r);
end;
function trgobj.isaddressregister(reg: tregister): boolean;
begin
result := true;
end;
procedure trgobj.ungetregister(list: taasmoutput; r : tregister);
begin
if r.enum=R_NO then
exit;
if r.enum>lastreg then
internalerror(200301081);
if r.enum in intregs then
ungetregisterint(list,r)
else if r.enum in fpuregs then
ungetregisterfpu(list,r)
else if r.enum in mmregs then
ungetregistermm(list,r)
else if r.enum in addrregs then
ungetaddressregister(list,r)
else internalerror(2002070602);
end;
procedure Trgobj.cleartempgen;
{$ifdef newra}
var i:Tsuperregister;
{$endif newra}
begin
countunusedregsint:=countusableregsint;
countunusedregsfpu:=countusableregsfpu;
countunusedregsmm:=countusableregsmm;
{$ifdef newra}
unusedregsint:=[0..255];
{$else}
unusedregsint:=usableregsint;
{$endif}
unusedregsfpu:=usableregsfpu;
unusedregsmm:=usableregsmm;
{$ifdef newra}
for i:=low(Tsuperregister) to high(Tsuperregister) do
if igraph.adjlist[i]<>nil then
dispose(igraph.adjlist[i]);
fillchar(igraph,sizeof(igraph),0);
{$endif}
end;
procedure trgobj.ungetreference(list : taasmoutput; const ref : treference);
begin
if ref.base.number<>NR_NO then
ungetregisterint(list,ref.base);
if ref.index.number<>NR_NO then
ungetregisterint(list,ref.index);
end;
procedure trgobj.saveintregvars(list:Taasmoutput;const s:Tsupregset);
var r:Tsuperregister;
begin
if not(cs_regalloc in aktglobalswitches) then
exit;
for r:=firstsaveintreg to lastsaveintreg do
if (r in is_reg_var_int) and
(r in s) then
store_regvar_int(list,r);
end;
procedure trgobj.saveotherregvars(list: taasmoutput; const s: tregisterset);
var
r: Tregister;
begin
if not(cs_regalloc in aktglobalswitches) then
exit;
if firstsavefpureg <> R_NO then
for r.enum := firstsavefpureg to lastsavefpureg do
if is_reg_var[r.enum] and
(r.enum in s) then
store_regvar(list,r);
if firstsavemmreg <> R_NO then
for r.enum := firstsavemmreg to lastsavemmreg do
if is_reg_var[r.enum] and
(r.enum in s) then
store_regvar(list,r);
end;
procedure trgobj.saveusedintregisters(list:Taasmoutput;
var saved:Tpushedsavedint;
const s:Tsupregset);
var r:Tsuperregister;
r2:Tregister;
hr : treference;
begin
usedintinproc:=usedintinproc+s;
for r:=firstsaveintreg to lastsaveintreg do
begin
saved[r].ofs:=reg_not_saved;
{ if the register is used by the calling subroutine and if }
{ it's not a regvar (those are handled separately) }
if not (r in is_reg_var_int) and
(r in s) and
{ and is present in use }
not(r in unusedregsint) then
begin
{ then save it }
tg.GetTemp(list,sizeof(aword),tt_persistant,hr);
saved[r].ofs:=hr.offset;
r2.enum:=R_INTREGISTER;
r2.number:=r shl 8 or R_SUBWHOLE;
cg.a_load_reg_ref(list,OS_INT,r2,hr);
cg.a_reg_dealloc(list,r2);
include(unusedregsint,r);
inc(countunusedregsint);
end;
end;
{$ifdef TEMPREGDEBUG}
testregisters32;
{$endif TEMPREGDEBUG}
end;
procedure trgobj.saveusedotherregisters(list: taasmoutput;
var saved : tpushedsaved; const s: tregisterset);
var
r : tregister;
hr : treference;
begin
usedinproc:=usedinproc + s;
{ don't try to save the fpu registers if not desired (e.g. for }
{ the 80x86) }
if firstsavefpureg <> R_NO then
for r.enum:=firstsavefpureg to lastsavefpureg do
begin
saved[r.enum].ofs:=reg_not_saved;
{ if the register is used by the calling subroutine and if }
{ it's not a regvar (those are handled separately) }
if not is_reg_var[r.enum] and
(r.enum in s) and
{ and is present in use }
not(r.enum in unusedregsfpu) then
begin
{ then save it }
tg.GetTemp(list,extended_size,tt_persistant,hr);
saved[r.enum].ofs:=hr.offset;
cg.a_loadfpu_reg_ref(list,OS_FLOAT,r,hr);
cg.a_reg_dealloc(list,r);
include(unusedregsfpu,r.enum);
inc(countunusedregsfpu);
end;
end;
{ don't save the vector registers if there's no support for them }
if firstsavemmreg <> R_NO then
for r.enum:=firstsavemmreg to lastsavemmreg do
begin
saved[r.enum].ofs:=reg_not_saved;
{ if the register is in use and if it's not a regvar (those }
{ are handled separately), save it }
if not is_reg_var[r.enum] and
(r.enum in s) and
{ and is present in use }
not(r.enum in unusedregsmm) then
begin
{ then save it }
tg.GetTemp(list,mmreg_size,tt_persistant,hr);
saved[r.enum].ofs:=hr.offset;
cg.a_loadmm_reg_ref(list,r,hr);
cg.a_reg_dealloc(list,r);
include(unusedregsmm,r.enum);
inc(countunusedregsmm);
end;
end;
{$ifdef TEMPREGDEBUG}
testregisters32;
{$endif TEMPREGDEBUG}
end;
procedure trgobj.restoreusedintregisters(list:Taasmoutput;
const saved:Tpushedsavedint);
var r:Tsuperregister;
r2:Tregister;
hr:Treference;
begin
for r:=lastsaveintreg downto firstsaveintreg do
begin
if saved[r].ofs <> reg_not_saved then
begin
r2.enum:=R_INTREGISTER;
r2.number:=NR_FRAME_POINTER_REG;
reference_reset_base(hr,r2,saved[r].ofs);
r2.enum:=R_INTREGISTER;
r2.number:=r shl 8 or R_SUBWHOLE;
cg.a_reg_alloc(list,r2);
cg.a_load_ref_reg(list,OS_INT,hr,r2);
if not (r in unusedregsint) then
{ internalerror(10)
in n386cal we always save/restore the reg *state*
using save/restoreunusedstate -> the current state
may not be real (JM) }
else
begin
dec(countunusedregsint);
exclude(unusedregsint,r);
end;
tg.UnGetTemp(list,hr);
end;
end;
{$ifdef TEMPREGDEBUG}
testregisters32;
{$endif TEMPREGDEBUG}
end;
procedure trgobj.restoreusedotherregisters(list : taasmoutput;
const saved : tpushedsaved);
var
r,r2 : tregister;
hr : treference;
begin
if firstsavemmreg <> R_NO then
for r.enum:=lastsavemmreg downto firstsavemmreg do
begin
if saved[r.enum].ofs <> reg_not_saved then
begin
r2.enum:=R_INTREGISTER;
r2.number:=NR_FRAME_POINTER_REG;
reference_reset_base(hr,r2,saved[r.enum].ofs);
cg.a_reg_alloc(list,r);
cg.a_loadmm_ref_reg(list,hr,r);
if not (r.enum in unusedregsmm) then
{ internalerror(10)
in n386cal we always save/restore the reg *state*
using save/restoreunusedstate -> the current state
may not be real (JM) }
else
begin
dec(countunusedregsmm);
exclude(unusedregsmm,r.enum);
end;
tg.UnGetTemp(list,hr);
end;
end;
if firstsavefpureg <> R_NO then
for r.enum:=lastsavefpureg downto firstsavefpureg do
begin
if saved[r.enum].ofs <> reg_not_saved then
begin
r2.enum:=R_INTREGISTER;
r2.number:=NR_FRAME_POINTER_REG;
reference_reset_base(hr,r2,saved[r.enum].ofs);
cg.a_reg_alloc(list,r);
cg.a_loadfpu_ref_reg(list,OS_FLOAT,hr,r);
if not (r.enum in unusedregsfpu) then
{ internalerror(10)
in n386cal we always save/restore the reg *state*
using save/restoreunusedstate -> the current state
may not be real (JM) }
else
begin
dec(countunusedregsfpu);
exclude(unusedregsfpu,r.enum);
end;
tg.UnGetTemp(list,hr);
end;
end;
{$ifdef TEMPREGDEBUG}
testregisters32;
{$endif TEMPREGDEBUG}
end;
procedure trgobj.incrementintregisterpushed(const s:Tsupregset);
var regi:Tsuperregister;
begin
for regi:=firstsaveintreg to lastsaveintreg do
begin
if (regi in s) then
inc(reg_pushes_int[regi],t_times*2);
end;
end;
procedure trgobj.incrementotherregisterpushed(const s:Tregisterset);
var
regi : Toldregister;
begin
if firstsavefpureg <> R_NO then
for regi:=firstsavefpureg to lastsavefpureg do
begin
if (regi in s) then
inc(reg_pushes[regi],t_times*2);
end;
if firstsavemmreg <> R_NO then
for regi:=firstsavemmreg to lastsavemmreg do
begin
if (regi in s) then
inc(reg_pushes[regi],t_times*2);
end;
end;
procedure trgobj.clearregistercount;
begin
fillchar(reg_pushes,sizeof(reg_pushes),0);
fillchar(is_reg_var,sizeof(is_reg_var),false);
is_reg_var_int:=[];
fillchar(regvar_loaded,sizeof(regvar_loaded),false);
regvar_loaded_int:=[];
end;
procedure trgobj.resetusableregisters;
begin
{ initialize fields with constant values from cpubase }
countusableregsint := cpubase.c_countusableregsint;
countusableregsfpu := cpubase.c_countusableregsfpu;
countusableregsmm := cpubase.c_countusableregsmm;
usableregsint := cpubase.usableregsint;
usableregsfpu := cpubase.usableregsfpu;
usableregsmm := cpubase.usableregsmm;
clearregistercount;
end;
procedure trgobj.makeregvarint(reg:Tnewregister);
var supreg:Tsuperregister;
begin
supreg:=reg shr 8;
dec(countusableregsint);
dec(countunusedregsint);
exclude(usableregsint,reg);
exclude(unusedregsint,reg);
include(is_reg_var_int,supreg);
end;
procedure trgobj.makeregvarother(reg: tregister);
begin
if reg.enum>lastreg then
internalerror(200301081);
if reg.enum in intregs then
internalerror(200301151)
else if reg.enum in fpuregs then
begin
dec(countusableregsfpu);
dec(countunusedregsfpu);
exclude(usableregsfpu,reg.enum);
exclude(unusedregsfpu,reg.enum);
end
else if reg.enum in mmregs then
begin
dec(countusableregsmm);
dec(countunusedregsmm);
exclude(usableregsmm,reg.enum);
exclude(unusedregsmm,reg.enum);
end;
is_reg_var[reg.enum]:=true;
end;
{$ifdef TEMPREGDEBUG}
procedure trgobj.testregisters;
var
r: tregister;
test : byte;
begin
test:=0;
for r := firstsaveintreg to lastsaveintreg do
inc(test,ord(r in unusedregsint));
if test<>countunusedregsint then
internalerror(10);
end;
{$endif TEMPREGDEBUG}
procedure trgobj.saveStateForInline(var state: pointer);
begin
new(psavedstate(state));
psavedstate(state)^.unusedregsint := unusedregsint;
psavedstate(state)^.usableregsint := usableregsint;
psavedstate(state)^.unusedregsfpu := unusedregsfpu;
psavedstate(state)^.usableregsfpu := usableregsfpu;
psavedstate(state)^.unusedregsmm := unusedregsmm;
psavedstate(state)^.usableregsmm := usableregsmm;
psavedstate(state)^.countunusedregsint := countunusedregsint;
psavedstate(state)^.countunusedregsfpu := countunusedregsfpu;
psavedstate(state)^.countunusedregsmm := countunusedregsmm;
psavedstate(state)^.countusableregsint := countusableregsint;
psavedstate(state)^.countusableregsfpu := countusableregsfpu;
psavedstate(state)^.countusableregsmm := countusableregsmm;
psavedstate(state)^.usedinproc := usedinproc;
psavedstate(state)^.usedbyproc := usedbyproc;
psavedstate(state)^.reg_pushes := reg_pushes;
psavedstate(state)^.is_reg_var := is_reg_var;
psavedstate(state)^.is_reg_var_int := is_reg_var_int;
psavedstate(state)^.regvar_loaded := regvar_loaded;
psavedstate(state)^.regvar_loaded_int := regvar_loaded_int;
{$ifdef TEMPREGDEBUG}
psavedstate(state)^.reg_user := reg_user;
psavedstate(state)^.reg_releaser := reg_releaser;
{$endif TEMPREGDEBUG}
end;
procedure trgobj.restoreStateAfterInline(var state: pointer);
begin
unusedregsint := psavedstate(state)^.unusedregsint;
usableregsint := psavedstate(state)^.usableregsint;
unusedregsfpu := psavedstate(state)^.unusedregsfpu;
usableregsfpu := psavedstate(state)^.usableregsfpu;
unusedregsmm := psavedstate(state)^.unusedregsmm;
usableregsmm := psavedstate(state)^.usableregsmm;
countunusedregsint := psavedstate(state)^.countunusedregsint;
countunusedregsfpu := psavedstate(state)^.countunusedregsfpu;
countunusedregsmm := psavedstate(state)^.countunusedregsmm;
countusableregsint := psavedstate(state)^.countusableregsint;
countusableregsfpu := psavedstate(state)^.countusableregsfpu;
countusableregsmm := psavedstate(state)^.countusableregsmm;
usedinproc := psavedstate(state)^.usedinproc;
usedbyproc := psavedstate(state)^.usedbyproc;
reg_pushes := psavedstate(state)^.reg_pushes;
is_reg_var := psavedstate(state)^.is_reg_var;
is_reg_var_int := psavedstate(state)^.is_reg_var_int;
regvar_loaded := psavedstate(state)^.regvar_loaded;
regvar_loaded_int := psavedstate(state)^.regvar_loaded_int;
{$ifdef TEMPREGDEBUG}
reg_user := psavedstate(state)^.reg_user;
reg_releaser := psavedstate(state)^.reg_releaser;
{$endif TEMPREGDEBUG}
dispose(psavedstate(state));
state := nil;
end;
procedure trgobj.saveUnusedState(var state: pointer);
begin
new(punusedstate(state));
punusedstate(state)^.unusedregsint := unusedregsint;
punusedstate(state)^.unusedregsfpu := unusedregsfpu;
punusedstate(state)^.unusedregsmm := unusedregsmm;
punusedstate(state)^.countunusedregsint := countunusedregsint;
punusedstate(state)^.countunusedregsfpu := countunusedregsfpu;
punusedstate(state)^.countunusedregsmm := countunusedregsmm;
end;
procedure trgobj.restoreUnusedState(var state: pointer);
begin
unusedregsint := punusedstate(state)^.unusedregsint;
unusedregsfpu := punusedstate(state)^.unusedregsfpu;
unusedregsmm := punusedstate(state)^.unusedregsmm;
countunusedregsint := punusedstate(state)^.countunusedregsint;
countunusedregsfpu := punusedstate(state)^.countunusedregsfpu;
countunusedregsmm := punusedstate(state)^.countunusedregsmm;
dispose(punusedstate(state));
state := nil;
end;
{$ifdef newra}
procedure Trgobj.add_edge(u,v:Tsuperregister);
{This procedure will add an edge to the virtual interference graph.}
procedure addadj(u,v:Tsuperregister);
begin
if igraph.adjlist[u]=nil then
begin
getmem(igraph.adjlist[u],16);
igraph.adjlist[u]^:='';
end
else if (length(igraph.adjlist[u]^) and 15)=15 then
reallocmem(igraph.adjlist[u],length(igraph.adjlist[u]^)+16);
igraph.adjlist[u]^:=igraph.adjlist[u]^+char(v);
end;
begin
if (u<>v) and not(v in igraph.bitmap[u]) then
begin
include(igraph.bitmap[u],v);
include(igraph.bitmap[v],u);
{Precoloured nodes are not stored in the interference graph.}
if not(u in [first_supreg..last_supreg]) then
addadj(u,v);
if not(v in [first_supreg..last_supreg]) then
addadj(v,u);
end;
end;
procedure Trgobj.add_edges_used(u:Tsuperregister);
var i:Tsuperregister;
begin
for i:=1 to 255 do
if not(i in unusedregsint) then
add_edge(u,i);
end;
{$endif}
{****************************************************************************
TReference
****************************************************************************}
procedure reference_reset(var ref : treference);
begin
FillChar(ref,sizeof(treference),0);
ref.base.enum:=R_INTREGISTER;
ref.index.enum:=R_INTREGISTER;
{$ifdef i386}
ref.segment.enum:=R_INTREGISTER;
{$endif}
end;
procedure reference_reset_old(var ref : treference);
begin
FillChar(ref,sizeof(treference),0);
end;
procedure reference_reset_base(var ref : treference;base : tregister;offset : longint);
begin
reference_reset(ref);
ref.base:=base;
ref.offset:=offset;
end;
procedure reference_reset_symbol(var ref : treference;sym : tasmsymbol;offset : longint);
begin
reference_reset(ref);
ref.symbol:=sym;
ref.offset:=offset;
end;
procedure reference_release(list: taasmoutput; const ref : treference);
begin
rg.ungetreference(list,ref);
end;
function references_equal(sref : treference;dref : treference):boolean;
begin
references_equal:=CompareByte(sref,dref,sizeof(treference))=0;
end;
{ on most processors , this routine does nothing, overriden currently }
{ only by 80x86 processor. }
function trgobj.makeregsize(reg: tregister; size: tcgsize): tregister;
begin
makeregsize := reg;
end;
{****************************************************************************
TLocation
****************************************************************************}
procedure location_reset(var l : tlocation;lt:TLoc;lsize:TCGSize);
begin
FillChar(l,sizeof(tlocation),0);
l.loc:=lt;
l.size:=lsize;
case l.loc of
LOC_REGISTER,LOC_CREGISTER:
begin
l.register.enum:=R_INTREGISTER;
l.registerhigh.enum:=R_INTREGISTER;
end;
LOC_REFERENCE,LOC_CREFERENCE:
begin
l.reference.base.enum:=R_INTREGISTER;
l.reference.index.enum:=R_INTREGISTER;
{$ifdef i386}
l.reference.segment.enum:=R_INTREGISTER;
{$endif}
end;
end;
end;
procedure location_release(list: taasmoutput; const l : tlocation);
begin
case l.loc of
LOC_REGISTER,LOC_CREGISTER :
begin
rg.ungetregisterint(list,l.register);
if l.size in [OS_64,OS_S64] then
rg.ungetregisterint(list,l.registerhigh);
end;
LOC_CREFERENCE,LOC_REFERENCE :
rg.ungetreference(list, l.reference);
end;
end;
procedure location_freetemp(list:taasmoutput; const l : tlocation);
begin
if (l.loc in [LOC_REFERENCE,LOC_CREFERENCE]) then
tg.ungetiftemp(list,l.reference);
end;
procedure location_copy(var destloc,sourceloc : tlocation);
begin
destloc:=sourceloc;
end;
procedure location_swap(var destloc,sourceloc : tlocation);
var
swapl : tlocation;
begin
swapl := destloc;
destloc := sourceloc;
sourceloc := swapl;
end;
initialization
;
finalization
rg.free;
end.
{
$Log$
Revision 1.32 2003-03-28 19:16:57 peter
* generic constructor working for i386
* remove fixed self register
* esi added as address register for i386
Revision 1.31 2003/03/11 21:46:24 jonas
* lots of new regallocator fixes, both in generic and ppc-specific code
(ppc compiler still can't compile the linux system unit though)
Revision 1.30 2003/03/09 21:18:59 olle
+ added cutils to the uses clause
Revision 1.29 2003/03/08 20:36:41 daniel
+ Added newra version of Ti386shlshrnode
+ Added interference graph construction code
Revision 1.28 2003/03/08 13:59:16 daniel
* Work to handle new register notation in ag386nsm
+ Added newra version of Ti386moddivnode
Revision 1.27 2003/03/08 10:53:48 daniel
* Created newra version of secondmul in n386add.pas
Revision 1.26 2003/03/08 08:59:07 daniel
+ $define newra will enable new register allocator
+ getregisterint will return imaginary registers with $newra
+ -sr switch added, will skip register allocation so you can see
the direct output of the code generator before register allocation
Revision 1.25 2003/02/26 20:50:45 daniel
* Fixed ungetreference
Revision 1.24 2003/02/19 22:39:56 daniel
* Fixed a few issues
Revision 1.23 2003/02/19 22:00:14 daniel
* Code generator converted to new register notation
- Horribily outdated todo.txt removed
Revision 1.22 2003/02/02 19:25:54 carl
* Several bugfixes for m68k target (register alloc., opcode emission)
+ VIS target
+ Generic add more complete (still not verified)
Revision 1.21 2003/01/08 18:43:57 daniel
* Tregister changed into a record
Revision 1.20 2002/10/05 12:43:28 carl
* fixes for Delphi 6 compilation
(warning : Some features do not work under Delphi)
Revision 1.19 2002/08/23 16:14:49 peter
* tempgen cleanup
* tt_noreuse temp type added that will be used in genentrycode
Revision 1.18 2002/08/17 22:09:47 florian
* result type handling in tcgcal.pass_2 overhauled
* better tnode.dowrite
* some ppc stuff fixed
Revision 1.17 2002/08/17 09:23:42 florian
* first part of procinfo rewrite
Revision 1.16 2002/08/06 20:55:23 florian
* first part of ppc calling conventions fix
Revision 1.15 2002/08/05 18:27:48 carl
+ more more more documentation
+ first version include/exclude (can't test though, not enough scratch for i386 :()...
Revision 1.14 2002/08/04 19:06:41 carl
+ added generic exception support (still does not work!)
+ more documentation
Revision 1.13 2002/07/07 09:52:32 florian
* powerpc target fixed, very simple units can be compiled
* some basic stuff for better callparanode handling, far from being finished
Revision 1.12 2002/07/01 18:46:26 peter
* internal linker
* reorganized aasm layer
Revision 1.11 2002/05/18 13:34:17 peter
* readded missing revisions
Revision 1.10 2002/05/16 19:46:44 carl
+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
+ try to fix temp allocation (still in ifdef)
+ generic constructor calls
+ start of tassembler / tmodulebase class cleanup
Revision 1.8 2002/04/21 15:23:03 carl
+ makeregsize
+ changeregsize is now a local routine
Revision 1.7 2002/04/20 21:32:25 carl
+ generic FPC_CHECKPOINTER
+ first parameter offset in stack now portable
* rename some constants
+ move some cpu stuff to other units
- remove unused constents
* fix stacksize for some targets
* fix generic size problems which depend now on EXTEND_SIZE constant
Revision 1.6 2002/04/15 19:03:31 carl
+ reg2str -> std_reg2str()
Revision 1.5 2002/04/06 18:13:01 jonas
* several powerpc-related additions and fixes
Revision 1.4 2002/04/04 19:06:04 peter
* removed unused units
* use tlocation.size in cg.a_*loc*() routines
Revision 1.3 2002/04/02 17:11:29 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 1.2 2002/04/01 19:24:25 jonas
* fixed different parameter name in interface and implementation
declaration of a method (only 1.0.x detected this)
Revision 1.1 2002/03/31 20:26:36 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
* push/popusedregisters is now called rg.save/restoreusedregisters and
(for i386) uses temps instead of push/pop's when using -Op3 (that code is
also better optimizable)
* 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
}
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