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{
Copyright (c) 1998-2002 by Florian Klaempfl
This unit implements the SPARC specific class for the register
allocator
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
****************************************************************************}
unit rgcpu;
{$i fpcdefs.inc}
interface
uses
aasmbase,aasmcpu,aasmtai,aasmsym,aasmdata,
cgbase,cgutils,
cpubase,
rgobj;
type
trgcpu=class(trgobj)
procedure add_constraints(reg:tregister);override;
function get_spill_subreg(r : tregister) : tsubregister;override;
procedure do_spill_read(list: TAsmList; pos: tai; const spilltemp: treference; tempreg: tregister; orgsupreg: tsuperregister); override;
procedure do_spill_written(list: TAsmList; pos: tai; const spilltemp: treference; tempreg: tregister; orgsupreg: tsuperregister); override;
function do_spill_replace(list:TAsmList;instr:tai_cpu_abstract_sym;orgreg:tsuperregister;const spilltemp:treference):boolean; override;
end;
implementation
uses
verbose,cutils,
globtype,
cgobj;
procedure trgcpu.add_constraints(reg:tregister);
var
supreg,i : Tsuperregister;
begin
case getsubreg(reg) of
{ Let 64bit floats conflict with all odd float regs }
R_SUBFD:
begin
supreg:=getsupreg(reg);
i:=RS_F1;
while (i<=RS_F31) do
begin
add_edge(supreg,i);
inc(i,2);
end;
end;
{ Let 64bit ints conflict with all odd int regs }
R_SUBQ:
begin
supreg:=getsupreg(reg);
i:=RS_G1;
while (i<=RS_I7) do
begin
add_edge(supreg,i);
inc(i,2);
end;
end;
else
;
end;
end;
function trgcpu.get_spill_subreg(r : tregister) : tsubregister;
begin
if getregtype(r)=R_FPUREGISTER then
result:=getsubreg(r)
else
result:=defaultsub;
end;
procedure trgcpu.do_spill_read(list: TAsmList; pos: tai; const spilltemp: treference; tempreg: tregister; orgsupreg: tsuperregister);
var
helpins : tai;
tmpref : treference;
helplist : TAsmList;
hreg : tregister;
begin
if abs(spilltemp.offset)>4095 then
begin
helplist:=TAsmList.create;
if getregtype(tempreg)=R_INTREGISTER then
hreg:=tempreg
else
hreg:=cg.getintregister(helplist,OS_ADDR);
{$ifdef SPARC}
reference_reset(tmpref,sizeof(pint),[]);
tmpref.offset:=spilltemp.offset;
tmpref.refaddr:=addr_high;
helplist.concat(taicpu.op_ref_reg(A_SETHI,tmpref,hreg));
tmpref.refaddr:=addr_low;
helplist.concat(taicpu.op_reg_ref_reg(A_OR,hreg,tmpref,hreg));
{$else SPARC}
if (spilltemp.offset>=-4294967296) and (spilltemp.offset<=-1) then
begin
helplist.concat(taicpu.op_const_reg(A_SETHI,(not(aint(spilltemp.offset)) shr 10) and $3fffff,hreg));
if (aint(spilltemp.offset) and aint($3ff)) or aint($1c00)<>0 then
helplist.concat(taicpu.op_reg_const_reg(A_XOR,hreg,(aint(spilltemp.offset) and aint($3ff)) or aint($1c00),hreg));
end
else
Internalerror(2017090901);
{$endif SPARC}
reference_reset_base(tmpref,hreg,0,spilltemp.temppos,sizeof(aint),[]);
tmpref.index:=spilltemp.base;
helpins:=spilling_create_load(tmpref,tempreg);
helplist.concat(helpins);
list.insertlistafter(pos,helplist);
helplist.free;
end
else
inherited;
end;
procedure trgcpu.do_spill_written(list: TAsmList; pos: tai; const spilltemp: treference; tempreg: tregister; orgsupreg: tsuperregister);
var
tmpref : treference;
helplist : TAsmList;
hreg : tregister;
begin
if abs(spilltemp.offset)>4095 then
begin
helplist:=TAsmList.create;
if getregtype(tempreg)=R_INTREGISTER then
hreg:=getregisterinline(helplist,[R_SUBWHOLE])
else
hreg:=cg.getintregister(helplist,OS_ADDR);
{$ifdef SPARC}
reference_reset(tmpref,sizeof(aint),[]);
tmpref.offset:=spilltemp.offset;
tmpref.refaddr:=addr_high;
helplist.concat(taicpu.op_ref_reg(A_SETHI,tmpref,hreg));
tmpref.refaddr:=addr_low;
helplist.concat(taicpu.op_reg_ref_reg(A_OR,hreg,tmpref,hreg));
{$else SPARC}
if (spilltemp.offset>=-4294967296) and (spilltemp.offset<=-1) then
begin
helplist.concat(taicpu.op_const_reg(A_SETHI,(not(aint(spilltemp.offset)) shr 10) and $3fffff,hreg));
if (aint(spilltemp.offset) and aint($3ff)) or aint($1c00)<>0 then
helplist.concat(taicpu.op_reg_const_reg(A_XOR,hreg,(aint(spilltemp.offset) and aint($3ff)) or aint($1c00),hreg));
end
else
Internalerror(2017090901);
{$endif SPARC}
reference_reset_base(tmpref,hreg,0,spilltemp.temppos,sizeof(aint),[]);
tmpref.index:=spilltemp.base;
helplist.concat(spilling_create_store(tempreg,tmpref));
if getregtype(tempreg)=R_INTREGISTER then
ungetregisterinline(helplist,hreg);
list.insertlistafter(pos,helplist);
helplist.free;
end
else
inherited;
end;
function trgcpu.do_spill_replace(list:TAsmList;instr:tai_cpu_abstract_sym;orgreg:tsuperregister;const spilltemp:treference):boolean;
var
opidx: longint;
begin
result:=false;
{ Replace 'mov src,orgreg' with 'st src,spilltemp'
and 'mov orgreg,dst' with 'ld spilltemp,dst' }
if (abs(spilltemp.offset)>4095) then
exit;
if ((regtype=R_INTREGISTER) and (instr.opcode<>A_MOV)) or
((regtype=R_FPUREGISTER) and (instr.opcode<>A_FMOVs) and (instr.opcode<>A_FMOVd)) then
exit;
{ Ignore mis-encoded stuff like 'mov %something,%y' }
if (instr.ops<>2) or
(instr.oper[0]^.typ<>top_reg) or
(instr.oper[1]^.typ<>top_reg) or
(getregtype(instr.oper[0]^.reg)<>regtype) or
(getregtype(instr.oper[1]^.reg)<>regtype) then
exit;
opidx:=-1;
if get_alias(getsupreg(instr.oper[0]^.reg))=orgreg then
begin
if (regtype=R_INTREGISTER) then
instr.opcode:=A_LD_R
else if (getsubreg(instr.oper[0]^.reg)=R_SUBFS) then
instr.opcode:=A_LDF
else
instr.opcode:=A_LDDF;
opidx:=0;
end
else if get_alias(getsupreg(instr.oper[1]^.reg))=orgreg then
begin
if (regtype=R_INTREGISTER) then
instr.opcode:=A_ST_R
else if (getsubreg(instr.oper[1]^.reg)=R_SUBFS) then
instr.opcode:=A_STF
else
instr.opcode:=A_STDF;
opidx:=1;
end
else
InternalError(2013061002);
instr.oper[opidx]^.typ:=top_ref;
new(instr.oper[opidx]^.ref);
instr.oper[opidx]^.ref^:=spilltemp;
result:=true;
end;
end.
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