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{
Copyright (c) 1998-2002 by Florian Klaempfl and Carl Eric Codere
Generate PowerPC32/64 assembler for in set/case 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 ngppcset;
{$i fpcdefs.inc}
interface
uses
node,nset,ncgset,cpubase,cgbase,cgobj,aasmbase,aasmtai,aasmdata,globtype;
type
tgppccasenode = class(tcgcasenode)
protected
procedure optimizevalues(var max_linear_list : aint; var max_dist : aword);override;
function has_jumptable : boolean;override;
procedure genjumptable(hp : pcaselabel;min_,max_ : aint);override;
procedure genlinearlist(hp : pcaselabel); override;
end;
implementation
uses
systems,
verbose,globals,constexp,
symconst,symdef,defutil,
paramgr,
cpuinfo,
pass_2,cgcpu,
ncon,
tgobj,ncgutil,regvars,rgobj,aasmcpu,
procinfo,
cgutils;
{*****************************************************************************
TCGCASENODE
*****************************************************************************}
procedure tgppccasenode.optimizevalues(var max_linear_list : aint; var max_dist : aword);
begin
max_linear_list := 10;
end;
function tgppccasenode.has_jumptable : boolean;
begin
has_jumptable:=true;
end;
procedure tgppccasenode.genjumptable(hp : pcaselabel;min_,max_ : aint);
var
table : tasmlabel;
last : TConstExprInt;
indexreg : tregister;
href : treference;
mulfactor: longint;
procedure genitem(list:TAsmList;t : pcaselabel);
var
i : TConstExprInt;
begin
if assigned(t^.less) then
genitem(list,t^.less);
{ fill possible hole }
i:=last+1;
while i<=t^._low-1 do
begin
list.concat(Tai_const.Create_rel_sym(aitconst_32bit,table,elselabel));
i:=i+1;
end;
i:=t^._low;
while i<=t^._high do
begin
list.concat(Tai_const.Create_rel_sym(aitconst_32bit,table,blocklabel(t^.blockid)));
i:=i+1;
end;
last:=t^._high;
if assigned(t^.greater) then
genitem(list,t^.greater);
end;
begin
last:=min_;
{ make it a 32bit register }
// allocate base and index registers register
indexreg:= cg.makeregsize(current_asmdata.CurrAsmList, hregister, OS_INT);
{ indexreg := hregister; }
cg.a_load_reg_reg(current_asmdata.CurrAsmList, opsize, OS_INT, hregister, indexreg);
if not(jumptable_no_range) then
begin
{ use aword(value-min)<aword(max-min) instead of two comparisons }
{ case expr outside min_ .. max_ => goto elselabel }
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_SUB,OS_INT,aint(min_),indexreg);
{ this trick requires an unsigned comparison in all cases }
cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,OS_INT,OC_A,aint(max_)-aint(min_),indexreg,elselabel);
{ already taken into account now }
min_:=0;
end;
current_asmdata.getjumplabel(table);
{ create reference, indexreg := indexreg * sizeof(jtentry) (= 4) }
mulfactor:=4;
cg.a_op_const_reg(current_asmdata.CurrAsmList, OP_MUL, OS_INT, mulfactor, indexreg);
reference_reset_symbol(href, table, (-aint(min_)) * mulfactor, 4);
hregister:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_loadaddr_ref_reg(current_asmdata.CurrAsmList,href,hregister);
reference_reset_base(href,hregister,0,4);
href.index:=indexreg;
indexreg:=cg.getaddressregister(current_asmdata.CurrAsmList);
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_S32,OS_ADDR,href,indexreg);
cg.a_op_reg_reg(current_asmdata.CurrAsmList,OP_ADD,OS_ADDR,hregister,indexreg);
current_asmdata.CurrAsmList.concat(taicpu.op_reg(A_MTCTR, indexreg));
current_asmdata.CurrAsmList.concat(taicpu.op_none(A_BCTR));
{ generate jump table }
current_asmdata.CurrAsmList.concat(Tai_label.Create(table));
genitem(current_asmdata.CurrAsmList,hp);
end;
procedure tgppccasenode.genlinearlist(hp : pcaselabel);
var
first, lastrange : boolean;
last : TConstExprInt;
procedure genitem(t : pcaselabel);
procedure gensub(value:longint);
var
tmpreg: tregister;
begin
value := -value;
if (value >= low(smallint)) and
(value <= high(smallint)) then
current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_const(A_ADDIC_,hregister,
hregister,value))
else
begin
tmpreg := cg.getintregister(current_asmdata.CurrAsmList,OS_INT);
cg.a_load_const_reg(current_asmdata.CurrAsmList,OS_INT,value,tmpreg);
current_asmdata.CurrAsmList.concat(taicpu.op_reg_reg_reg(A_ADD_,hregister,
hregister,tmpreg));
end;
end;
begin
if (get_min_value(left.resultdef) >= int64(low(smallint))) and
(get_max_value(left.resultdef) <= int64(high(word))) then
begin
genlinearcmplist(hp);
exit;
end;
if assigned(t^.less) then
genitem(t^.less);
{ need we to test the first value }
if first and (t^._low>get_min_value(left.resultdef)) then
begin
cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,OS_INT,jmp_lt,aword(t^._low.svalue),hregister,elselabel);
end;
if t^._low=t^._high then
begin
if t^._low-last=0 then
cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,OS_INT,OC_EQ,0,hregister,blocklabel(t^.blockid))
else
gensub(longint(int64(t^._low-last)));
tcgppc(cg).a_jmp_cond(current_asmdata.CurrAsmList,OC_EQ,blocklabel(t^.blockid));
last:=t^._low;
lastrange := false;
end
else
begin
{ it begins with the smallest label, if the value }
{ is even smaller then jump immediately to the }
{ ELSE-label }
if first then
begin
{ have we to ajust the first value ? }
if (t^._low>get_min_value(left.resultdef)) or (get_min_value(left.resultdef)<>0) then
gensub(longint(int64(t^._low)));
end
else
begin
{ if there is no unused label between the last and the }
{ present label then the lower limit can be checked }
{ immediately. else check the range in between: }
gensub(longint(int64(t^._low-last)));
if ((t^._low-last) <> 1) or
(not lastrange) then
tcgppc(cg).a_jmp_cond(current_asmdata.CurrAsmList,jmp_lt,elselabel);
end;
gensub(longint(int64(t^._high-t^._low)));
tcgppc(cg).a_jmp_cond(current_asmdata.CurrAsmList,jmp_le,blocklabel(t^.blockid));
last:=t^._high;
lastrange := true;
end;
first:=false;
if assigned(t^.greater) then
genitem(t^.greater);
end;
begin
{ do we need to generate cmps? }
if (with_sign and (min_label<0)) or
(opsize in [OS_32,OS_64,OS_S64]) then
genlinearcmplist(hp)
else
begin
last:=0;
lastrange:=false;
first:=true;
genitem(hp);
cg.a_jmp_always(current_asmdata.CurrAsmList,elselabel);
end;
end;
begin
ccasenode:=tgppccasenode;
end.
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