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{
Copyright (c) 1998-2002 by Florian Klaempfl
Generate x86 assembler for in memory related nodes
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************
}
unit nx86mem;
{$i fpcdefs.inc}
interface
uses
globtype,
cgbase,cpuinfo,cpubase,
symtype,
node,nmem,ncgmem;
type
tx86derefnode = class(tcgderefnode)
procedure pass_generate_code;override;
end;
tx86vecnode = class(tcgvecnode)
procedure update_reference_reg_mul(maybe_const_reg: tregister; regsize: tdef; l: aint);override;
end;
implementation
uses
cutils,verbose,
aasmtai,aasmdata,
cgutils,cgobj,
symconst,symdef,symcpu;
{*****************************************************************************
TX86DEREFNODE
*****************************************************************************}
procedure tx86derefnode.pass_generate_code;
begin
inherited pass_generate_code;
case tcpupointerdef(left.resultdef).x86pointertyp of
x86pt_near: ;
x86pt_near_cs: location.reference.segment:=NR_CS;
x86pt_near_ds: location.reference.segment:=NR_DS;
x86pt_near_ss: location.reference.segment:=NR_SS;
x86pt_near_es: location.reference.segment:=NR_ES;
x86pt_near_fs: location.reference.segment:=NR_FS;
x86pt_near_gs: location.reference.segment:=NR_GS;
{$ifdef i8086}
x86pt_far,
x86pt_huge: {do nothing; handled in ti8086derefnode};
{$else i8086}
x86pt_far: internalerror(2013050401);
x86pt_huge: internalerror(2013050402);
{$endif i8086}
else
internalerror(2013050403);
end;
end;
{*****************************************************************************
TX86VECNODE
*****************************************************************************}
{ this routine must, like any other routine, not change the contents }
{ of base/index registers of references, as these may be regvars. }
{ The register allocator can coalesce one LOC_REGISTER being moved }
{ into another (as their live ranges won't overlap), but not a }
{ LOC_CREGISTER moved into a LOC_(C)REGISTER most of the time (as }
{ the live range of the LOC_CREGISTER will most likely overlap the }
{ the live range of the target LOC_(C)REGISTER) }
{ The passed register may be a LOC_CREGISTER as well. }
procedure tx86vecnode.update_reference_reg_mul(maybe_const_reg: tregister; regsize: tdef; l: aint);
var
l2 : integer;
hreg : tregister;
saveseg: TRegister;
begin
{ Optimized for x86 to use the index register and scalefactor }
if location.reference.index=NR_NO then
begin
{ no preparations needed }
end
else if location.reference.base=NR_NO then
begin
if (location.reference.scalefactor > 1) then
hreg:=cg.getaddressregister(current_asmdata.CurrAsmList)
else
hreg:=NR_NO;
case location.reference.scalefactor of
0,1 : hreg:=location.reference.index;
2 : cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SHL,OS_ADDR,1,location.reference.index,hreg);
4 : cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SHL,OS_ADDR,2,location.reference.index,hreg);
8 : cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SHL,OS_ADDR,3,location.reference.index,hreg);
else
internalerror(2008091401);
end;
location.reference.base:=hreg;
end
else
begin
hreg:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,location.reference,hreg);
{ reference_reset_base kills the segment, so make sure we preserve it }
saveseg:=location.reference.segment;
reference_reset_base(location.reference,hreg,0,location.reference.alignment);
location.reference.segment:=saveseg;
end;
{ insert the new index register and scalefactor or
do the multiplication manual }
case l of
1,2,4,8 :
begin
location.reference.scalefactor:=l;
hreg:=maybe_const_reg;
end;
else
begin
hreg:=cg.getaddressregister(current_asmdata.CurrAsmList);
if ispowerof2(l,l2) then
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SHL,OS_ADDR,l2,maybe_const_reg,hreg)
else
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_IMUL,OS_ADDR,l,maybe_const_reg,hreg);
end;
end;
location.reference.index:=hreg;
end;
begin
cderefnode:=tx86derefnode;
cvecnode:=tx86vecnode;
end.
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