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https://gitlab.com/freepascal.org/fpc/source.git
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f3fc72095f
* merged isconvertable and is_equal into compare_defs(_ext) * made operator search faster by walking the list only once
597 lines
23 KiB
ObjectPascal
597 lines
23 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2002 by Florian Klaempfl and Jonas Maebe
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This unit handles register variable allocation
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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 regvars;
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{$i fpcdefs.inc}
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interface
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uses
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aasmbase,aasmtai,aasmcpu,
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node,
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symsym,
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cpubase, cginfo, tgobj, rgobj;
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procedure assign_regvars(p: tnode);
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procedure load_regvars(asml: TAAsmoutput; p: tnode);
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procedure cleanup_regvars(asml: TAAsmoutput);
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procedure store_regvar(asml: TAAsmoutput; reg: tregister);
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procedure load_regvar(asml: TAAsmoutput; vsym: tvarsym);
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procedure load_regvar_reg(asml: TAAsmoutput; reg: tregister);
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procedure load_all_regvars(asml: TAAsmoutput);
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procedure sync_regvars(list1, list2: taasmoutput; const regvarsloaded1,
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regvarsloaded2: regvar_booleanarray);
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implementation
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uses
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globtype,systems,comphook,
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cutils,cclasses,verbose,globals,
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symconst,symbase,symtype,symdef,paramgr,defutil,
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cgbase,cgobj,cgcpu,rgcpu;
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procedure searchregvars(p : tnamedindexitem;arg:pointer);
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var
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i,j,k : longint;
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parasym : boolean;
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begin
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parasym:=pboolean(arg)^;
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if (tsym(p).typ=varsym) and (vo_regable in tvarsym(p).varoptions) then
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begin
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j:=tvarsym(p).refs;
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{ parameter get a less value }
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if parasym then
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begin
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if cs_littlesize in aktglobalswitches then
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dec(j,1)
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else
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dec(j,100);
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end;
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{ walk through all momentary register variables }
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for i:=1 to maxvarregs do
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begin
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with pregvarinfo(aktprocdef.regvarinfo)^ do
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if ((regvars[i]=nil) or (j>regvars_refs[i])) and (j>0) then
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begin
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for k:=maxvarregs-1 downto i do
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begin
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regvars[k+1]:=regvars[k];
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regvars_para[k+1]:=regvars_para[k];
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regvars_refs[k+1]:=regvars_refs[k];
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end;
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{ calc the new refs
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tvarsym(p).refs:=j; }
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regvars[i]:=tvarsym(p);
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regvars_para[i]:=parasym;
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regvars_refs[i]:=j;
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break;
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end;
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end;
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end;
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end;
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procedure searchfpuregvars(p : tnamedindexitem;arg:pointer);
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var
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i,j,k : longint;
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parasym : boolean;
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begin
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parasym:=pboolean(arg)^;
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if (tsym(p).typ=varsym) and (vo_fpuregable in tvarsym(p).varoptions) then
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begin
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j:=tvarsym(p).refs;
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{ parameter get a less value }
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if parasym then
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begin
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if cs_littlesize in aktglobalswitches then
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dec(j,1)
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else
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dec(j,100);
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end;
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{ walk through all momentary register variables }
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for i:=1 to maxfpuvarregs do
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begin
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with pregvarinfo(aktprocdef.regvarinfo)^ do
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if ((fpuregvars[i]=nil) or (j>fpuregvars_refs[i])) and (j>0) then
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begin
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for k:=maxfpuvarregs-1 downto i do
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begin
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fpuregvars[k+1]:=fpuregvars[k];
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fpuregvars_para[k+1]:=fpuregvars_para[k];
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fpuregvars_refs[k+1]:=fpuregvars_refs[k];
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end;
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{ calc the new refs
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tvarsym(p).refs:=j; }
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fpuregvars[i]:=tvarsym(p);
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fpuregvars_para[i]:=parasym;
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fpuregvars_refs[i]:=j;
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break;
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end;
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end;
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end;
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end;
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procedure assign_regvars(p: tnode);
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{ register variables }
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var
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regvarinfo: pregvarinfo;
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i: longint;
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parasym : boolean;
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begin
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{ max. optimizations }
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{ only if no asm is used }
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{ and no try statement }
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if (cs_regalloc in aktglobalswitches) and
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((procinfo.flags and (pi_uses_asm or pi_uses_exceptions))=0) then
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begin
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new(regvarinfo);
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fillchar(regvarinfo^,sizeof(regvarinfo^),0);
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aktprocdef.regvarinfo := regvarinfo;
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if (p.registers32<4) then
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begin
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parasym:=false;
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symtablestack.foreach_static({$ifdef FPCPROCVAR}@{$endif}searchregvars,@parasym);
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{ copy parameter into a register ? }
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parasym:=true;
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symtablestack.next.foreach_static({$ifdef FPCPROCVAR}@{$endif}searchregvars,@parasym);
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{ hold needed registers free }
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for i:=maxvarregs downto maxvarregs-p.registers32+1 do
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begin
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regvarinfo^.regvars[i]:=nil;
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regvarinfo^.regvars_para[i] := false;
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end;
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{ now assign register }
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for i:=1 to maxvarregs-p.registers32 do
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begin
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if assigned(regvarinfo^.regvars[i]) and
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(rg.reg_pushes[varregs[i]] < regvarinfo^.regvars[i].refs) then
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begin
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{ register is no longer available for }
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{ expressions }
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{ search the register which is the most }
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{ unused }
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rg.makeregvar(varregs[i]);
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{ possibly no 32 bit register are needed }
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{ call by reference/const ? }
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if (regvarinfo^.regvars[i].varspez in [vs_var,vs_out]) or
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((regvarinfo^.regvars[i].varspez=vs_const) and
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paramanager.push_addr_param(regvarinfo^.regvars[i].vartype.def,aktprocdef.proccalloption)) then
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begin
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regvarinfo^.regvars[i].reg:=varregs[i];
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end
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else
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if (regvarinfo^.regvars[i].vartype.def.deftype in [orddef,enumdef]) and
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(regvarinfo^.regvars[i].vartype.def.size=1) then
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begin
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regvarinfo^.regvars[i].reg:=rg.makeregsize(varregs[i],OS_8);
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end
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else
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if (regvarinfo^.regvars[i].vartype.def.deftype in [orddef,enumdef]) and
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(regvarinfo^.regvars[i].vartype.def.size=2) then
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begin
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regvarinfo^.regvars[i].reg:=rg.makeregsize(varregs[i],OS_16);
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end
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else
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begin
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regvarinfo^.regvars[i].reg:=varregs[i];
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end;
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{ procedure uses this register }
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include(rg.usedinproc,varregs[i]);
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end
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else
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begin
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regvarinfo^.regvars[i] := nil;
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regvarinfo^.regvars_para[i] := false;
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end;
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end;
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end;
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if ((p.registersfpu+1)<maxfpuvarregs) then
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begin
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parasym:=false;
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symtablestack.foreach_static({$ifdef FPCPROCVAR}@{$endif}searchfpuregvars,@parasym);
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{$ifdef dummy}
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{ this code should be never enabled because }
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{ 1. the caller loads parameters into registers }
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{ 2. (later) the CSE loads a parameter into a }
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{ register, if necessary }
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{ (FK) }
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{ copy parameter into a register ? }
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parasym:=true;
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symtablestack.next.foreach_static({$ifdef FPCPROCVAR}@{$endif}searchregvars);
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{$endif dummy}
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{ hold needed registers free }
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{ in non leaf procedures we must be very careful }
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{ with assigning registers }
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if aktmaxfpuregisters=-1 then
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begin
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if (procinfo.flags and pi_do_call)<>0 then
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begin
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for i:=maxfpuvarregs downto 2 do
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regvarinfo^.fpuregvars[i]:=nil;
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end
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else
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begin
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for i:=maxfpuvarregs downto maxfpuvarregs-p.registersfpu do
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regvarinfo^.fpuregvars[i]:=nil;
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end;
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end
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else
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begin
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for i:=aktmaxfpuregisters+1 to maxfpuvarregs do
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regvarinfo^.fpuregvars[i]:=nil;
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end;
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{ now assign register }
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for i:=1 to maxfpuvarregs do
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begin
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if assigned(regvarinfo^.fpuregvars[i]) then
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begin
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{$ifdef i386}
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{ reserve place on the FPU stack }
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regvarinfo^.fpuregvars[i].reg:=trgcpu(rg).correct_fpuregister(R_ST0,i);
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{$else i386}
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rg.makeregvar(regvarinfo^.fpuregvars[i].reg);
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{$endif i386}
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end;
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end;
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end;
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end;
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end;
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procedure store_regvar(asml: TAAsmoutput; reg: tregister);
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var
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i: longint;
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hr: treference;
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regvarinfo: pregvarinfo;
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vsym: tvarsym;
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begin
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regvarinfo := pregvarinfo(aktprocdef.regvarinfo);
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if not assigned(regvarinfo) then
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exit;
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for i := 1 to maxvarregs do
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if assigned(regvarinfo^.regvars[i]) and
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(rg.makeregsize(regvarinfo^.regvars[i].reg,OS_INT) = reg) then
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begin
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if rg.regvar_loaded[rg.makeregsize(reg,OS_INT)] then
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begin
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vsym := tvarsym(regvarinfo^.regvars[i]);
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{ we only have to store the regvar back to memory if it's }
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{ possible that it's been modified (JM) }
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if not(vsym.varspez in [vs_const,vs_var,vs_out]) then
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begin
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reference_reset(hr);
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if vsym.owner.symtabletype in [inlinelocalsymtable,localsymtable] then
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hr.offset:=-vsym.address+vsym.owner.address_fixup
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else
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hr.offset:=vsym.address+vsym.owner.address_fixup;
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hr.base:=procinfo.framepointer;
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cg.a_load_reg_ref(asml,def_cgsize(vsym.vartype.def),vsym.reg,hr);
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end;
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asml.concat(tai_regalloc.dealloc(rg.makeregsize(reg,OS_INT)));
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rg.regvar_loaded[rg.makeregsize(reg,OS_INT)] := false;
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end;
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break;
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end;
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end;
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procedure load_regvar(asml: TAAsmoutput; vsym: tvarsym);
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var
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hr: treference;
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opsize: tcgsize;
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reg : tregister;
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begin
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reg:=rg.makeregsize(vsym.reg,OS_INT);
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if not rg.regvar_loaded[reg] then
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begin
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asml.concat(tai_regalloc.alloc(reg));
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reference_reset(hr);
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if vsym.owner.symtabletype in [inlinelocalsymtable,localsymtable] then
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hr.offset:=-vsym.address+vsym.owner.address_fixup
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else
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hr.offset:=vsym.address+vsym.owner.address_fixup;
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hr.base:=procinfo.framepointer;
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if (vsym.varspez in [vs_var,vs_out]) or
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((vsym.varspez=vs_const) and
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paramanager.push_addr_param(vsym.vartype.def,aktprocdef.proccalloption)) then
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opsize := OS_ADDR
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else
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opsize := def_cgsize(vsym.vartype.def);
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cg.a_load_ref_reg(asml,opsize,hr,reg);
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rg.regvar_loaded[reg] := true;
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end;
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end;
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procedure load_regvar_reg(asml: TAAsmoutput; reg: tregister);
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var
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i: longint;
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regvarinfo: pregvarinfo;
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reg_spare : tregister;
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begin
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regvarinfo := pregvarinfo(aktprocdef.regvarinfo);
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if not assigned(regvarinfo) then
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exit;
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reg_spare := rg.makeregsize(reg,OS_INT);
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for i := 1 to maxvarregs do
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if assigned(regvarinfo^.regvars[i]) and
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(rg.makeregsize(regvarinfo^.regvars[i].reg,OS_INT) = reg_spare) then
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load_regvar(asml,tvarsym(regvarinfo^.regvars[i]))
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end;
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procedure load_all_regvars(asml: TAAsmoutput);
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var
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i: longint;
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regvarinfo: pregvarinfo;
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begin
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regvarinfo := pregvarinfo(aktprocdef.regvarinfo);
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if not assigned(regvarinfo) then
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exit;
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for i := 1 to maxvarregs do
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if assigned(regvarinfo^.regvars[i]) {and
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(makereg32(regvarinfo^.regvars[i].reg) in [R_EAX,R_EBX,R_ECX,R_EDX])} then
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load_regvar(asml,tvarsym(regvarinfo^.regvars[i]))
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end;
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procedure load_regvars(asml: TAAsmoutput; p: tnode);
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var
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i: longint;
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regvarinfo: pregvarinfo;
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begin
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if (cs_regalloc in aktglobalswitches) and
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((procinfo.flags and (pi_uses_asm or pi_uses_exceptions))=0) then
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begin
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regvarinfo := pregvarinfo(aktprocdef.regvarinfo);
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{ can happen when inlining assembler procedures (JM) }
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if not assigned(regvarinfo) then
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exit;
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for i:=1 to maxvarregs do
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begin
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if assigned(regvarinfo^.regvars[i]) then
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begin
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if cs_asm_source in aktglobalswitches then
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asml.insert(tai_comment.Create(strpnew(regvarinfo^.regvars[i].name+
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' with weight '+tostr(regvarinfo^.regvars[i].refs)+' assigned to register '+
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std_reg2str[regvarinfo^.regvars[i].reg])));
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if (status.verbosity and v_debug)=v_debug then
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Message3(cg_d_register_weight,std_reg2str[regvarinfo^.regvars[i].reg],
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tostr(regvarinfo^.regvars[i].refs),regvarinfo^.regvars[i].name);
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end;
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end;
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for i:=1 to maxfpuvarregs do
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begin
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if assigned(regvarinfo^.fpuregvars[i]) then
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begin
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{$ifdef i386}
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{ reserve place on the FPU stack }
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regvarinfo^.fpuregvars[i].reg:=trgcpu(rg).correct_fpuregister(R_ST0,i-1);
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asml.concat(Taicpu.op_none(A_FLDZ,S_NO));
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{$endif i386}
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end;
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end;
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{$ifdef i386}
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if assigned(p) then
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if cs_asm_source in aktglobalswitches then
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asml.insert(tai_comment.Create(strpnew(tostr(p.registersfpu)+
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' registers on FPU stack used by temp. expressions')));
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{$endif i386}
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for i:=1 to maxfpuvarregs do
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begin
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if assigned(regvarinfo^.fpuregvars[i]) then
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begin
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if cs_asm_source in aktglobalswitches then
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asml.insert(tai_comment.Create(strpnew(regvarinfo^.fpuregvars[i].name+
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' with weight '+tostr(regvarinfo^.fpuregvars[i].refs)+' assigned to register '+
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std_reg2str[regvarinfo^.fpuregvars[i].reg])));
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if (status.verbosity and v_debug)=v_debug then
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Message3(cg_d_register_weight,std_reg2str[regvarinfo^.fpuregvars[i].reg],
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tostr(regvarinfo^.fpuregvars[i].refs),regvarinfo^.fpuregvars[i].name);
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end;
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end;
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if cs_asm_source in aktglobalswitches then
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asml.insert(tai_comment.Create(strpnew('Register variable assignment:')));
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end;
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end;
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procedure sync_regvars(list1, list2: taasmoutput; const regvarsloaded1,
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regvarsloaded2: regvar_booleanarray);
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var
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counter: tregister;
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begin
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for counter := low(rg.regvar_loaded) to high(rg.regvar_loaded) do
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begin
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rg.regvar_loaded[counter] := regvarsloaded1[counter] and
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regvarsloaded2[counter];
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if regvarsloaded1[counter] xor regvarsloaded2[counter] then
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if regvarsloaded1[counter] then
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load_regvar_reg(list2,counter)
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else
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load_regvar_reg(list1,counter);
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end;
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end;
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procedure cleanup_regvars(asml: TAAsmoutput);
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var
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i: longint;
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reg : tregister;
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begin
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{ can happen when inlining assembler procedures (JM) }
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if not assigned(aktprocdef.regvarinfo) then
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exit;
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if (cs_regalloc in aktglobalswitches) and
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((procinfo.flags and (pi_uses_asm or pi_uses_exceptions))=0) then
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with pregvarinfo(aktprocdef.regvarinfo)^ do
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begin
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{$ifdef i386}
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for i:=1 to maxfpuvarregs do
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if assigned(fpuregvars[i]) then
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{ ... and clean it up }
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asml.concat(Taicpu.op_reg(A_FSTP,S_NO,R_ST0));
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{$endif i386}
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for i := 1 to maxvarregs do
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begin
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if assigned(regvars[i]) then
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begin
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reg:=rg.makeregsize(regvars[i].reg,OS_INT);
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if (rg.regvar_loaded[reg]) then
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asml.concat(tai_regalloc.dealloc(reg));
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end;
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end;
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end;
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end;
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end.
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{
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$Log$
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Revision 1.43 2002-11-25 17:43:24 peter
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* splitted defbase in defutil,symutil,defcmp
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* merged isconvertable and is_equal into compare_defs(_ext)
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|
* made operator search faster by walking the list only once
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Revision 1.42 2002/11/18 17:31:59 peter
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* pass proccalloption to ret_in_xxx and push_xxx functions
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Revision 1.41 2002/08/25 19:25:20 peter
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* sym.insert_in_data removed
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* symtable.insertvardata/insertconstdata added
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* removed insert_in_data call from symtable.insert, it needs to be
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called separatly. This allows to deref the address calculation
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* procedures now calculate the parast addresses after the procedure
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directives are parsed. This fixes the cdecl parast problem
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* push_addr_param has an extra argument that specifies if cdecl is used
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or not
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Revision 1.40 2002/08/18 20:06:25 peter
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* inlining is now also allowed in interface
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* renamed write/load to ppuwrite/ppuload
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* tnode storing in ppu
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* nld,ncon,nbas are already updated for storing in ppu
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Revision 1.39 2002/08/17 09:23:41 florian
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* first part of procinfo rewrite
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Revision 1.38 2002/08/06 20:55:22 florian
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* first part of ppc calling conventions fix
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Revision 1.37 2002/07/20 11:57:57 florian
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* types.pas renamed to defbase.pas because D6 contains a types
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unit so this would conflicts if D6 programms are compiled
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+ Willamette/SSE2 instructions to assembler added
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Revision 1.36 2002/07/11 14:41:30 florian
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* start of the new generic parameter handling
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Revision 1.35 2002/07/01 18:46:25 peter
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* internal linker
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* reorganized aasm layer
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Revision 1.34 2002/06/24 12:43:00 jonas
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* fixed errors found with new -CR code from Peter when cycling with -O2p3r
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Revision 1.33 2002/05/18 13:34:17 peter
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* readded missing revisions
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Revision 1.32 2002/05/16 19:46:44 carl
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+ defines.inc -> fpcdefs.inc to avoid conflicts if compiling by hand
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+ try to fix temp allocation (still in ifdef)
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+ generic constructor calls
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+ start of tassembler / tmodulebase class cleanup
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Revision 1.30 2002/05/12 16:53:10 peter
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* moved entry and exitcode to ncgutil and cgobj
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* foreach gets extra argument for passing local data to the
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iterator function
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* -CR checks also class typecasts at runtime by changing them
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into as
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* fixed compiler to cycle with the -CR option
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* fixed stabs with elf writer, finally the global variables can
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be watched
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* removed a lot of routines from cga unit and replaced them by
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calls to cgobj
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* u32bit-s32bit updates for and,or,xor nodes. When one element is
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|
u32bit then the other is typecasted also to u32bit without giving
|
|
a rangecheck warning/error.
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* fixed pascal calling method with reversing also the high tree in
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the parast, detected by tcalcst3 test
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Revision 1.29 2002/04/21 15:23:34 carl
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+ changeregsize -> makeregsize
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Revision 1.28 2002/04/19 15:46:03 peter
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* mangledname rewrite, tprocdef.mangledname is now created dynamicly
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in most cases and not written to the ppu
|
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* add mangeledname_prefix() routine to generate the prefix of
|
|
manglednames depending on the current procedure, object and module
|
|
* removed static procprefix since the mangledname is now build only
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|
on demand from tprocdef.mangledname
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Revision 1.27 2002/04/15 19:44:19 peter
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* fixed stackcheck that would be called recursively when a stack
|
|
error was found
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* generic changeregsize(reg,size) for i386 register resizing
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|
* removed some more routines from cga unit
|
|
* fixed returnvalue handling
|
|
* fixed default stacksize of linux and go32v2, 8kb was a bit small :-)
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Revision 1.26 2002/04/15 19:04:04 carl
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+ reg2str -> std_reg2str()
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Revision 1.25 2002/04/06 18:13:01 jonas
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|
* several powerpc-related additions and fixes
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|
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Revision 1.24 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
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|
|
|
Revision 1.23 2002/03/31 20:26:36 jonas
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|
+ 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
|
|
|
|
}
|