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https://gitlab.com/freepascal.org/fpc/source.git
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583 lines
22 KiB
ObjectPascal
583 lines
22 KiB
ObjectPascal
{
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$Id$
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Copyright (c) 1998-2000 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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{$i defines.inc}
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interface
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uses
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aasm,
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node,
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symsym,
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cpubase;
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procedure assign_regvars(p: tnode);
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procedure load_regvars(asml: TAAsmoutput; p: tnode);
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procedure cleanup_regvars(asml: TAAsmoutput);
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{$ifdef i386}
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procedure store_regvar(asml: TAAsmoutput; reg: tregister);
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procedure load_regvar(asml: TAAsmoutput; vsym: pvarsym);
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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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{$endif i386}
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implementation
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uses
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globtype,systems,comphook,
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cutils,cobjects,verbose,globals,
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symconst,symbase,symtype,symdef,types,
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hcodegen,cpuasm,tgcpu;
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var
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parasym : boolean;
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procedure searchregvars(p : pnamedindexobject);
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var
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i,j,k : longint;
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begin
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if (psym(p)^.typ=varsym) and (vo_regable in pvarsym(p)^.varoptions) then
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begin
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j:=pvarsym(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(aktprocsym^.definition^.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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pvarsym(p)^.refs:=j; }
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regvars[i]:=pvarsym(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 : pnamedindexobject);
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var
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i,j,k : longint;
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begin
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if (psym(p)^.typ=varsym) and (vo_fpuregable in pvarsym(p)^.varoptions) then
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begin
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j:=pvarsym(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(aktprocsym^.definition^.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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pvarsym(p)^.refs:=j; }
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fpuregvars[i]:=pvarsym(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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{$ifdef i386}
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function reg32(reg: tregister): tregister;
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begin
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case regsize(reg) of
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S_B: reg32 := reg8toreg32(reg);
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S_W: reg32 := reg16toreg32(reg);
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S_L: reg32 := reg;
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end;
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end;
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{$else i386}
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function reg32(reg: tregister): tregister;
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begin
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reg32 := reg;
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end;
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{$endif i386}
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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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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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aktprocsym^.definition^.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({$ifdef FPCPROCVAR}@{$endif}searchregvars);
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{ copy parameter into a register ? }
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parasym:=true;
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symtablestack^.next^.foreach({$ifdef FPCPROCVAR}@{$endif}searchregvars);
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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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(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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usableregs:=usableregs-[varregs[i]];
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is_reg_var[varregs[i]]:=true;
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dec(c_usableregs);
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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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push_addr_param(regvarinfo^.regvars[i]^.vartype.def)) 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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(porddef(regvarinfo^.regvars[i]^.vartype.def)^.size=1) then
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begin
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{$ifdef i386}
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regvarinfo^.regvars[i]^.reg:=reg32toreg8(varregs[i]);
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{$endif}
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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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(porddef(regvarinfo^.regvars[i]^.vartype.def)^.size=2) then
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begin
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{$ifdef i386}
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regvarinfo^.regvars[i]^.reg:=reg32toreg16(varregs[i]);
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{$endif}
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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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if regvarinfo^.regvars_para[i] then
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unused:=unused - [regvarinfo^.regvars[i]^.reg];
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{ procedure uses this register }
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{$ifdef i386}
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usedinproc:=usedinproc or ($80 shr byte(varregs[i]));
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{$endif i386}
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{$ifdef m68k}
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usedinproc:=usedinproc or ($800 shr word(varregs[i]));
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{$endif m68k}
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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({$ifdef FPCPROCVAR}@{$endif}searchfpuregvars);
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{$ifdef dummy}
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{ copy parameter into a register ? }
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parasym:=true;
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symtablestack^.next^.foreach({$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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{$ifdef i386}
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{ reserve place on the FPU stack }
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regvarinfo^.fpuregvars[i]^.reg:=correct_fpuregister(R_ST0,i-1);
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{$endif i386}
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{$ifdef m68k}
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regvarinfo^.fpuregvars[i]^.reg:=fpuvarregs[i];
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{$endif m68k}
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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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{$ifdef i386}
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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: preference;
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regvarinfo: pregvarinfo;
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vsym: pvarsym;
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begin
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regvarinfo := pregvarinfo(aktprocsym^.definition^.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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(reg32(regvarinfo^.regvars[i]^.reg) = reg) then
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begin
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if regvar_loaded[reg32(reg)] then
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begin
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vsym := pvarsym(regvarinfo^.regvars[i]);
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new(hr);
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reset_reference(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 hr^.offset:=vsym^.address+vsym^.owner^.address_fixup;
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hr^.base:=procinfo^.framepointer;
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asml.concat(Taicpu.op_reg_ref(A_MOV,regsize(vsym^.reg),vsym^.reg,hr));
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asml.concat(Tairegalloc.dealloc(reg32(reg)));
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regvar_loaded[reg32(reg)] := 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: pvarsym);
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var
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hr: preference;
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opsize: topsize;
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opcode: tasmop;
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begin
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if not regvar_loaded[reg32(vsym^.reg)] then
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begin
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asml.concat(Tairegalloc.alloc(reg32(vsym^.reg)));
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{ zero the regvars because the upper 48bits must be clear }
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{ for 8bits vars when using them with btrl }
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{ don't care about sign extension, since the upper 24/16 }
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{ bits won't be adapted when doing maths anyway (JM) }
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case regsize(vsym^.reg) of
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S_L:
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begin
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opsize := S_L;
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opcode := A_MOV;
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end;
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S_W:
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begin
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opsize := S_WL;
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opcode := A_MOVZX;
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end;
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S_B:
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begin
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opsize := S_BL;
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opcode := A_MOVZX;
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end;
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end;
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asml.concat(Tairegalloc.alloc(reg32(vsym^.reg)));
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new(hr);
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reset_reference(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 hr^.offset:=vsym^.address+vsym^.owner^.address_fixup;
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hr^.base:=procinfo^.framepointer;
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asml.concat(Taicpu.op_ref_reg(opcode,opsize,hr,reg32(vsym^.reg)));
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regvar_loaded[reg32(vsym^.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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begin
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regvarinfo := pregvarinfo(aktprocsym^.definition^.regvarinfo);
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if not assigned(regvarinfo) then
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exit;
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reg := reg32(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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(reg32(regvarinfo^.regvars[i]^.reg) = reg) then
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load_regvar(asml,pvarsym(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(aktprocsym^.definition^.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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(reg32(regvarinfo^.regvars[i]^.reg) in [R_EAX,R_EBX,R_ECX,R_EDX]) then
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load_regvar(asml,pvarsym(regvarinfo^.regvars[i]))
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end;
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{$endif i386}
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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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{hr : preference;}
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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(aktprocsym^.definition^.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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{$ifdef m68k}
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for i:=1 to maxvarregs do
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begin
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{ parameter must be load }
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if regvarinfo^.regvars_para[i] then
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begin
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{ procinfo is there actual, }
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{ because we can't never be in a }
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{ nested procedure }
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{ when loading parameter to reg }
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new(hr);
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reset_reference(hr^);
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hr^.offset:=pvarsym(regvarinfo^.regvars[i])^.address+procinfo^.para_offset;
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hr^.base:=procinfo^.framepointer;
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asml.concat(Taicpu,op_ref_reg(A_MOVE,regsize(regvarinfo^.regvars[i]^.reg),
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hr,regvarinfo^.regvars[i]^.reg)));
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end
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end;
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{$endif m68k}
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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_asm_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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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,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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{$ifdef i386}
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{ reserve place on the FPU stack }
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regvarinfo^.fpuregvars[i]^.reg:=correct_fpuregister(R_ST0,i-1);
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asml.concat(Taicpu.op_none(A_FLDZ,S_NO));
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{$endif i386}
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{$ifdef dummy}
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{ parameter must be load }
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if regvarinfo^.fpuregvars_para[i] then
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begin
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{ procinfo is there actual, }
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{ because we can't never be in a }
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{ nested procedure }
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{ when loading parameter to reg }
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new(hr);
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reset_reference(hr^);
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hr^.offset:=pvarsym(regvarinfo^.regvars[i])^.address+procinfo^.para_offset;
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hr^.base:=procinfo^.framepointer;
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{$ifdef i386}
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asml.concat(Taicpu,op_ref_reg(A_MOV,regsize(regvarinfo^.regvars[i]^.reg),
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hr,regvarinfo^.regvars[i]^.reg)));
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{$endif i386}
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{$ifdef m68k}
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asml.concat(Taicpu,op_ref_reg(A_MOVE,regsize(regvarinfo^.regvars[i]^.reg),
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hr,regvarinfo^.regvars[i]^.reg)));
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{$endif m68k}
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end;
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{$endif dummy}
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end;
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end;
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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_asm_comment.Create(strpnew(tostr(p.registersfpu)+
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' registers on FPU stack used by temp. expressions')));
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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_asm_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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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,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;
|
|
if cs_asm_source in aktglobalswitches then
|
|
asml.insert(Tai_asm_comment.Create(strpnew('Register variable assignment:')));
|
|
end;
|
|
end;
|
|
|
|
|
|
procedure cleanup_regvars(asml: TAAsmoutput);
|
|
var
|
|
i: longint;
|
|
begin
|
|
{$ifdef i386}
|
|
{ can happen when inlining assembler procedures (JM) }
|
|
if not assigned(aktprocsym^.definition^.regvarinfo) then
|
|
exit;
|
|
if (cs_regalloc in aktglobalswitches) and
|
|
((procinfo^.flags and (pi_uses_asm or pi_uses_exceptions))=0) then
|
|
with pregvarinfo(aktprocsym^.definition^.regvarinfo)^ do
|
|
begin
|
|
for i:=1 to maxfpuvarregs do
|
|
if assigned(fpuregvars[i]) then
|
|
{ ... and clean it up }
|
|
asml.concat(Taicpu.op_reg(A_FSTP,S_NO,R_ST0));
|
|
for i := 1 to maxvarregs do
|
|
if assigned(regvars[i]) and
|
|
(regvar_loaded[reg32(regvars[i]^.reg)]) then
|
|
asml.concat(Tairegalloc.dealloc(reg32(regvars[i]^.reg)));
|
|
end;
|
|
{$endif i386}
|
|
end;
|
|
|
|
end.
|
|
|
|
{
|
|
$Log$
|
|
Revision 1.15 2000-12-25 00:07:28 peter
|
|
+ new tlinkedlist class (merge of old tstringqueue,tcontainer and
|
|
tlinkedlist objects)
|
|
|
|
Revision 1.14 2000/12/05 11:44:32 jonas
|
|
+ new integer regvar handling, should be much more efficient
|
|
|
|
Revision 1.13 2000/11/29 00:30:39 florian
|
|
* unused units removed from uses clause
|
|
* some changes for widestrings
|
|
|
|
Revision 1.12 2000/11/04 14:25:21 florian
|
|
+ merged Attila's changes for interfaces, not tested yet
|
|
|
|
Revision 1.11 2000/10/31 22:02:51 peter
|
|
* symtable splitted, no real code changes
|
|
|
|
Revision 1.10 2000/10/14 10:14:52 peter
|
|
* moehrendorf oct 2000 rewrite
|
|
|
|
Revision 1.9 2000/10/01 19:48:25 peter
|
|
* lot of compile updates for cg11
|
|
|
|
Revision 1.8 2000/09/30 16:08:45 peter
|
|
* more cg11 updates
|
|
|
|
Revision 1.7 2000/09/30 13:08:16 jonas
|
|
* regvars are now zeroed at the start of their life if they contain an 8
|
|
or 16bit var/parameter, because the full 32bits are used if they are
|
|
necessary for a btrl instruction
|
|
|
|
Revision 1.6 2000/09/24 15:06:27 peter
|
|
* use defines.inc
|
|
|
|
Revision 1.5 2000/08/27 16:11:52 peter
|
|
* moved some util functions from globals,cobjects to cutils
|
|
* splitted files into finput,fmodule
|
|
|
|
Revision 1.4 2000/08/17 11:07:51 jonas
|
|
* fixed crash when inlining assembler procedures with -Or
|
|
|
|
Revision 1.3 2000/08/04 05:52:00 jonas
|
|
* correct version (I also had a regvars.pp locally, which was used
|
|
instead of the regvars.pas on CVS, so I didn't notice the errors :( )
|
|
|
|
Revision 1.2 2000/08/03 14:36:47 jonas
|
|
* fixed inserting of allocated register for regvars (only those for
|
|
parameters were done, and sometimes even the wrong ones)
|
|
|
|
Revision 1.1 2000/08/03 13:17:25 jonas
|
|
+ allow regvars to be used inside inlined procs, which required the
|
|
following changes:
|
|
+ load regvars in genentrycode/free them in genexitcode (cgai386)
|
|
* moved all regvar related code to new regvars unit
|
|
+ added pregvarinfo type to hcodegen
|
|
+ added regvarinfo field to tprocinfo (symdef/symdefh)
|
|
* deallocate the regvars of the caller in secondprocinline before
|
|
inlining the called procedure and reallocate them afterwards
|
|
|
|
}
|