mirror of
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658c46b903
* symtables based on TFPHashObjectList and TFPObjectList
* rename torddef.typ to torddef.ordtype
* rename tfloatdef.typ to tfloatdef.floattype
* rename tdef.deftype to tdef.typ
* remove obsolete browser code, browcol is kept so the ide
can still be compiled
git-svn-id: trunk@5192 -
667 lines
25 KiB
ObjectPascal
667 lines
25 KiB
ObjectPascal
{
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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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{$i fpcdefs.inc}
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interface
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uses
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aasmbase,aasmtai,aasmdata,aasmcpu,
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node,
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symsym,
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cpubase, cgbase, tgobj;
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{$ifdef OLDREGVARS}
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procedure assign_regvars(p: tnode);
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procedure load_regvars(asml: TAsmList; p: tnode);
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procedure cleanup_regvars(asml: TAsmList);
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procedure store_regvar(asml: TAsmList; reg: tregister);
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procedure load_regvar(asml: TAsmList; vsym: tvarsym);
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procedure load_regvar_reg(asml: TAsmList; reg: tregister);
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procedure load_all_regvars(asml: TAsmList);
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procedure free_regvars(list: TAsmList);
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{ procedure translate_regvars(list: TAsmList); }
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{$endif OLDREGVARS}
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{$ifdef i386}
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(*
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procedure sync_regvars_other(list1, list2: TAsmList; const regvarsloaded1,
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regvarsloaded2: regvarother_booleanarray);
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procedure sync_regvars_int(list1, list2: TAsmList; const regvarsloaded1,
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regvarsloaded2: Tsuperregisterset);
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*)
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{$endif i386}
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implementation
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uses
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globtype,systems,comphook,
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cutils,cclasses,verbose,globals,
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psub,
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symconst,symbase,symtype,symdef,paramgr,defutil,
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cpuinfo,cgobj,procinfo;
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{$ifdef OLDREGVARS}
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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 ((tvarsym(p).varregable <> vr_none) or
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((tvarsym(p).varspez in [vs_var,vs_const,vs_out]) and
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paramanager.push_addr_param(tvarsym(p).varspez,tvarsym(p).vardef,current_procinfo.procdef.proccalloption))) and
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not tvarsym(p).vardef.needs_inittable then
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begin
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j:=tvarsym(p).refs;
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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(current_procinfo.procdef.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]:=tsym(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 (tvarsym(p).varregable <> vr_none) 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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{ 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(current_procinfo.procdef.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]:=tsym(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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{$ifndef i386}
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hp: tparaitem;
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{$endif i386}
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regvarinfo: pregvarinfo;
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i: longint;
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parasym : boolean;
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siz : tcgsize;
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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_opt_regvar in current_settings.optimizerswitches) and
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{ we have to store regvars back to memory in this case (the nested }
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{ procedures can access the variables of the parent) }
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(tcgprocinfo(current_procinfo).nestedprocs.count = 0) and
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not(pi_has_assembler_block in current_procinfo.flags) and
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not(pi_uses_exceptions in current_procinfo.flags) 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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current_procinfo.procdef.regvarinfo := regvarinfo;
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if (p.registersint<maxvarregs) then
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begin
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parasym:=false;
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symtablestack.foreach_static(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(searchregvars,@parasym);
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{ hold needed registers free }
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for i:=maxvarregs downto maxvarregs-p.registersint+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.registersint do
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begin
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if assigned(regvarinfo^.regvars[i]) and
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{ currently we assume we can use registers for all }
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{ regvars if procedure does no call }
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(not(pi_do_call in current_procinfo.flags) or
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{ otherwise, demand some (arbitrary) minimum usage }
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(tvarsym(regvarinfo^.regvars[i]).refs > 100)) 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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{ call by reference/const ? }
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if paramanager.push_addr_param(tvarsym(regvarinfo^.regvars[i]).varspez,tvarsym(regvarinfo^.regvars[i]).vardef,current_procinfo.procdef.proccalloption) then
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siz:=OS_32
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else
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if (tvarsym(regvarinfo^.regvars[i]).vardef.typ in [orddef,enumdef]) and
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(tvarsym(regvarinfo^.regvars[i]).vardef.size=1) then
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siz:=OS_8
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else
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if (tvarsym(regvarinfo^.regvars[i]).vardef.typ in [orddef,enumdef]) and
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(tvarsym(regvarinfo^.regvars[i]).vardef.size=2) then
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siz:=OS_16
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else
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siz:=OS_32;
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{ allocate a register for this regvar }
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tvarsym(regvarinfo^.regvars[i]).localloc.register:=cg.getintregister(current_asmdata.CurrAsmList,siz);
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tvarsym(regvarinfo^.regvars[i]).localloc.loc:=LOC_REGISTER;
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{ and make sure it can't be freed }
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{ rg.makeregvarint(getsupreg(regvarinfo^.regvars[i].localloc.register));}
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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(searchfpuregvars,@parasym);
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{$ifndef i386}
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{ this code should be never enabled because }
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{ 1. the caller loads parameters into registers }
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{ 2. (later) the CSE loads a parameter into a }
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{ register, if necessary }
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{ (FK) }
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{ copy parameter into a register ? }
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parasym:=true;
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symtablestack.next.foreach_static(searchregvars,@parasym);
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{$endif i386}
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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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{$ifdef i386}
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if current_settings.maxfpuregisters=-1 then
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begin
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if (pi_do_call in current_procinfo.flags) then
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begin
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for i:=maxfpuvarregs downto 2 do
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regvarinfo^.fpuregvars[i]:=nil;
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end
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else
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{$endif i386}
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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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{$ifdef i386}
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end
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else
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begin
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for i:=current_settings.maxfpuregisters+1 to maxfpuvarregs do
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regvarinfo^.fpuregvars[i]:=nil;
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end;
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{$endif i386}
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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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{$ifdef i386}
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{ reserve place on the FPU stack }
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{$error fixme x86 fpuregvars}
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{ regvarinfo^.fpuregvars[i].localloc.register:=trgcpu(rg).correct_fpuregister(NR_ST0,i);}
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{$else i386}
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{$ifdef x86_64}
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{$endif x86_64}
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begin
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tvarsym(regvarinfo^.fpuregvars[i]).localloc.register:=cg.getfpuregister(current_asmdata.CurrAsmList,OS_F64);
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tvarsym(regvarinfo^.fpuregvars[i]).localloc.loc:=LOC_FPUREGISTER;
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{ rg.makeregvarother(regvarinfo^.fpuregvars[i].localloc.register);}
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end;
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{$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: TAsmList; reg: tregister);
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var
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i: longint;
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cgsize : tcgsize;
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r : tregister;
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hr: treference;
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regvarinfo: pregvarinfo;
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vsym: tvarsym;
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regidx : tregisterindex;
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supreg : tsuperregister;
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begin
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{$ifdef i386}
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regvarinfo := pregvarinfo(current_procinfo.procdef.regvarinfo);
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if not assigned(regvarinfo) then
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exit;
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if getregtype(reg)=R_INTREGISTER then
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begin
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supreg:=getsupreg(reg);
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for i := 1 to maxvarregs do
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if assigned(regvarinfo^.regvars[i]) and
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(getsupreg(tvarsym(regvarinfo^.regvars[i]).localloc.register)=supreg) then
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begin
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{$warning fixme regvar_loaded_int}
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(* if supreg in rg.regvar_loaded_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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{$warning FIXME Check vsym.localloc for regvars}
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// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
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cgsize:=def_cgsize(vsym.vardef);
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cg.a_load_reg_ref(asml,cgsize,cgsize,vsym.localloc.register,hr);
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end;
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asml.concat(tai_regalloc.dealloc(vsym.localloc.register));
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exclude(rg.regvar_loaded_int,supreg);
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end;
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*)
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break;
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end;
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end
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else
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begin
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for i := 1 to maxvarregs do
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if assigned(regvarinfo^.regvars[i]) then
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begin
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{$warning fixme regvars}
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(*
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r:=rg.makeregsize(regvarinfo^.regvars[i].localloc.register,OS_INT);
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if (r = reg) then
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begin
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regidx:=findreg_by_number(r);
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if rg.regvar_loaded_other[regidx] 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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{$warning FIXME Check vsym.localloc for regvars}
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// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
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cgsize:=def_cgsize(vsym.vardef);
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cg.a_load_reg_ref(asml,cgsize,cgsize,vsym.localloc.register,hr);
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end;
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asml.concat(tai_regalloc.dealloc(vsym.localloc.register));
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rg.regvar_loaded_other[regidx] := false;
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end;
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break;
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end;
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*)
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end;
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end;
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{$endif i386}
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end;
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procedure load_regvar(asml: TAsmList; vsym: tvarsym);
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var
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hr: treference;
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opsize: tcgsize;
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r,
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reg : tregister;
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regidx : tregisterindex;
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begin
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{$ifndef i386}
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exit;
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{$endif i386}
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reg:=vsym.localloc.register;
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{$warning fixme regvars}
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(*
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if getregtype(reg)=R_INTREGISTER then
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begin
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if not(getsupreg(reg) in rg.regvar_loaded_int) then
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begin
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asml.concat(tai_regalloc.alloc(reg));
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{$warning FIXME Check vsym.localloc for regvars}
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// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
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if paramanager.push_addr_param(vsym.varspez,vsym.vardef,current_procinfo.procdef.proccalloption) then
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opsize := OS_ADDR
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else
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opsize := def_cgsize(vsym.vardef);
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cg.a_load_ref_reg(asml,opsize,opsize,hr,reg);
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include(rg.regvar_loaded_int,getsupreg(reg));
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end;
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end
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else
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begin
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r:=rg.makeregsize(reg,OS_INT);
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regidx:=findreg_by_number(r);
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if not rg.regvar_loaded_other[regidx] then
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begin
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asml.concat(tai_regalloc.alloc(reg));
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{$warning FIXME Check vsym.localloc for regvars}
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// reference_reset_base(hr,current_procinfo.framepointer,vsym.adjusted_address);
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if paramanager.push_addr_param(vsym.varspez,vsym.vardef,current_procinfo.procdef.proccalloption) then
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opsize := OS_ADDR
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else
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opsize := def_cgsize(vsym.vardef);
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cg.a_load_ref_reg(asml,opsize,opsize,hr,reg);
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rg.regvar_loaded_other[regidx] := true;
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end;
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end;
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*)
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end;
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procedure load_regvar_reg(asml: TAsmList; 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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supreg : tsuperregister;
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begin
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{
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regvarinfo := pregvarinfo(current_procinfo.procdef.regvarinfo);
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if not assigned(regvarinfo) then
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exit;
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if getregtype(reg)=R_INTREGISTER then
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begin
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supreg:=getsupreg(reg);
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for i := 1 to maxvarregs do
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if assigned(regvarinfo^.regvars[i]) and
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(getsupreg(regvarinfo^.regvars[i].localloc.register) = supreg) then
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load_regvar(asml,tvarsym(regvarinfo^.regvars[i]))
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end
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else
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begin
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reg_spare := cg.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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(cg.makeregsize(regvarinfo^.regvars[i].localloc.register,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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}
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end;
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procedure load_all_regvars(asml: TAsmList);
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{
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var
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i: longint;
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regvarinfo: pregvarinfo;
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}
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begin
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{
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regvarinfo := pregvarinfo(current_procinfo.procdef.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]) then
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load_regvar(asml,tvarsym(regvarinfo^.regvars[i]))
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}
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end;
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procedure load_regvars(asml: TAsmList; 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_opt_regvar in current_settings.optimizerswitches) and
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not(pi_has_assembler_block in current_procinfo.flags) and
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not(pi_uses_exceptions in current_procinfo.flags) then
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begin
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regvarinfo := pregvarinfo(current_procinfo.procdef.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 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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{$warning fixme fpustack}
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(*
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|
regvarinfo^.fpuregvars[i].localloc.register:=trgcpu(rg).correct_fpuregister(NR_ST0,i-1);
|
|
*)
|
|
asml.concat(Taicpu.op_none(A_FLDZ,S_NO));
|
|
{$endif i386}
|
|
end;
|
|
end;
|
|
{$ifdef i386}
|
|
if assigned(p) then
|
|
if cs_asm_source in current_settings.globalswitches then
|
|
asml.insert(tai_comment.Create(strpnew(tostr(p.registersfpu)+
|
|
' registers on FPU stack used by temp. expressions')));
|
|
{$endif i386}
|
|
{
|
|
for i:=1 to maxfpuvarregs do
|
|
begin
|
|
if assigned(regvarinfo^.fpuregvars[i]) then
|
|
begin
|
|
if cs_asm_source in current_settings.globalswitches then
|
|
asml.insert(tai_comment.Create(strpnew(regvarinfo^.fpuregvars[i].name+
|
|
' with weight '+tostr(regvarinfo^.fpuregvars[i].refs)+' assigned to register '+
|
|
std_regname(regvarinfo^.fpuregvars[i].localloc.register))));
|
|
if (status.verbosity and v_debug)=v_debug then
|
|
Message3(cg_d_register_weight,std_regname(regvarinfo^.fpuregvars[i].localloc.register),
|
|
tostr(regvarinfo^.fpuregvars[i].refs),regvarinfo^.fpuregvars[i].name);
|
|
end;
|
|
end;
|
|
if cs_asm_source in current_settings.globalswitches then
|
|
asml.insert(tai_comment.Create(strpnew('Register variable assignment:')));
|
|
}
|
|
end;
|
|
end;
|
|
|
|
{$ifdef i386}
|
|
(*
|
|
procedure sync_regvars_other(list1, list2: TAsmList; const regvarsloaded1,
|
|
regvarsloaded2: regvarother_booleanarray);
|
|
var
|
|
counter: tregisterindex;
|
|
begin
|
|
for counter := low(rg.regvar_loaded_other) to high(rg.regvar_loaded_other) do
|
|
begin
|
|
rg.regvar_loaded_other[counter] := regvarsloaded1[counter] and
|
|
regvarsloaded2[counter];
|
|
if regvarsloaded1[counter] xor regvarsloaded2[counter] then
|
|
if regvarsloaded1[counter] then
|
|
load_regvar_reg(list2,counter)
|
|
else
|
|
load_regvar_reg(list1,counter);
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure sync_regvars_int(list1, list2: TAsmList; const regvarsloaded1,
|
|
regvarsloaded2: Tsuperregisterset);
|
|
var
|
|
i : longint;
|
|
r : tregister;
|
|
begin
|
|
for i:=1 to maxvarregs do
|
|
begin
|
|
r:=newreg(R_INTREGISTER,varregs[i],R_SUBWHOLE);
|
|
if (varregs[i] in regvarsloaded1) and
|
|
not(varregs[i] in regvarsloaded2) then
|
|
load_regvar_reg(list2,r)
|
|
else
|
|
if (varregs[i] in regvarsloaded2) and
|
|
not(varregs[i] in regvarsloaded1) then
|
|
load_regvar_reg(list1,r);
|
|
end;
|
|
end;
|
|
*)
|
|
{$endif i386}
|
|
|
|
|
|
procedure cleanup_regvars(asml: TAsmList);
|
|
var
|
|
i: longint;
|
|
reg : tregister;
|
|
regidx : tregisterindex;
|
|
begin
|
|
{ can happen when inlining assembler procedures (JM) }
|
|
if not assigned(current_procinfo.procdef.regvarinfo) then
|
|
exit;
|
|
if (cs_opt_regvar in current_settings.optimizerswitches) and
|
|
not(pi_has_assembler_block in current_procinfo.flags) and
|
|
not(pi_uses_exceptions in current_procinfo.flags) then
|
|
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
|
|
begin
|
|
{$ifdef i386}
|
|
for i:=1 to maxfpuvarregs do
|
|
if assigned(fpuregvars[i]) then
|
|
{ ... and clean it up }
|
|
asml.concat(Taicpu.op_reg(A_FSTP,S_NO,NR_ST0));
|
|
{$endif i386}
|
|
(*
|
|
for i := 1 to maxvarregs do
|
|
begin
|
|
if assigned(regvars[i]) then
|
|
begin
|
|
reg:=regvars[i].localloc.register;
|
|
if getregtype(reg)=R_INTREGISTER then
|
|
begin
|
|
end
|
|
else
|
|
begin
|
|
reg:=cg.makeregsize(reg,OS_INT);
|
|
regidx:=findreg_by_number(reg);
|
|
{$warning fixme regvar dealloc}
|
|
{
|
|
if (rg.regvar_loaded_other[regidx]) then
|
|
asml.concat(tai_regalloc.dealloc(reg));
|
|
}
|
|
end;
|
|
end;
|
|
end;
|
|
*)
|
|
end;
|
|
end;
|
|
|
|
{
|
|
|
|
Note: this one can't really be "fixed": register colouring happens after
|
|
stabs generation. It could still be useful to generate the "var X is
|
|
assigned to register Y with weight ZZZ" messages though
|
|
|
|
procedure translate_regvars(list: TAsmList);
|
|
var
|
|
i: longint;
|
|
r: tregister;
|
|
begin
|
|
if not assigned(current_procinfo.procdef.regvarinfo) then
|
|
exit;
|
|
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
|
|
begin
|
|
for i := 1 to maxvarregs do
|
|
if assigned(regvars[i]) then
|
|
begin
|
|
cg.rg[R_INTREGISTER].translate_register(tvarsym(regvars[i]).localloc.register);
|
|
r:=tvarsym(regvars[i]).localloc.register;
|
|
if cs_asm_source in current_settings.globalswitches then
|
|
list.insert(tai_comment.Create(strpnew(tvarsym(regvars[i]).name+
|
|
' with weight '+tostr(tvarsym(regvars[i]).refs)+' assigned to register '+
|
|
std_regname(r))));
|
|
Message3(cg_d_register_weight,std_regname(r),
|
|
tostr(tvarsym(regvars[i]).refs),tvarsym(regvars[i]).name);
|
|
end;
|
|
for i := 1 to maxfpuvarregs do
|
|
if assigned(fpuregvars[i]) then
|
|
begin
|
|
cg.rg[R_FPUREGISTER].translate_register(tvarsym(regvars[i]).localloc.register);
|
|
r:=tvarsym(fpuregvars[i]).localloc.register;
|
|
if cs_asm_source in current_settings.globalswitches then
|
|
list.insert(tai_comment.Create(strpnew(tvarsym(fpuregvars[i]).name+
|
|
' with weight '+tostr(tvarsym(fpuregvars[i]).refs)+' assigned to register '+
|
|
std_regname(r))));
|
|
Message3(cg_d_register_weight,std_regname(r),
|
|
tostr(tvarsym(fpuregvars[i]).refs),tvarsym(fpuregvars[i]).name);
|
|
end;
|
|
end;
|
|
end;
|
|
}
|
|
|
|
procedure free_regvars(list: TAsmList);
|
|
var
|
|
i: longint;
|
|
reg: tregister;
|
|
size: tcgsize;
|
|
begin
|
|
if not assigned(current_procinfo.procdef.regvarinfo) then
|
|
exit;
|
|
with pregvarinfo(current_procinfo.procdef.regvarinfo)^ do
|
|
begin
|
|
for i := 1 to maxvarregs do
|
|
if assigned(regvars[i]) then
|
|
begin
|
|
reg:=cg.makeregsize(list,tvarsym(regvars[i]).localloc.register,OS_INT);
|
|
cg.a_load_reg_reg(list,OS_INT,OS_INT,reg,reg);
|
|
end;
|
|
for i := 1 to maxfpuvarregs do
|
|
if assigned(fpuregvars[i]) then
|
|
begin
|
|
reg:=tvarsym(fpuregvars[i]).localloc.register;
|
|
size:=reg_cgsize(reg);
|
|
cg.a_loadfpu_reg_reg(list,size,reg,reg);
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
{$endif OLDREGVARS}
|
|
|
|
|
|
end.
|