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{
Copyright (c) 1998-2002 by Florian Klaempfl and Carl Eric Codere
Generate PowerPC 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 nppcset;
{$i fpcdefs.inc}
interface
uses
node,nset,ncgset,cpubase,cgbase,cgobj,aasmbase,aasmtai,globtype;
type
tppccasenode = class(tcgcasenode)
protected
function has_jumptable : boolean;override;
procedure genjumptable(hp : pcaselabel;min_,max_ : aint);override;
procedure genlinearlist(hp : pcaselabel); override;
end;
implementation
uses
systems,
verbose,globals,
symconst,symdef,defutil,
paramgr,
cpuinfo,
pass_2,cgcpu,
ncon,
tgobj,ncgutil,regvars,rgobj,aasmcpu,
procinfo,
cgutils;
{*****************************************************************************
TCGCASENODE
*****************************************************************************}
function tppccasenode.has_jumptable : boolean;
begin
has_jumptable:=true;
end;
procedure tppccasenode.genjumptable(hp : pcaselabel;min_,max_ : aint);
var
table : tasmlabel;
last : TConstExprInt;
indexreg : tregister;
href : treference;
procedure genitem(list:taasmoutput;t : pcaselabel);
var
i : aint;
begin
if assigned(t^.less) then
genitem(list,t^.less);
{ fill possible hole }
for i:=last+1 to t^._low-1 do
list.concat(Tai_const.Create_sym(elselabel));
for i:=t^._low to t^._high do
list.concat(Tai_const.Create_sym(blocklabel(t^.blockid)));
last:=t^._high;
if assigned(t^.greater) then
genitem(list,t^.greater);
end;
begin
if not(jumptable_no_range) then
begin
{ case expr less than min_ => goto elselabel }
cg.a_cmp_const_reg_label(exprasmlist,opsize,jmp_lt,aint(min_),hregister,elselabel);
{ case expr greater than max_ => goto elselabel }
cg.a_cmp_const_reg_label(exprasmlist,opsize,jmp_gt,aint(max_),hregister,elselabel);
end;
objectlibrary.getjumplabel(table);
{ make it a 32bit register }
// allocate base and index registers register
indexreg:= cg.makeregsize(exprasmlist, hregister, OS_INT);
{ indexreg := hregister; }
cg.a_load_reg_reg(exprasmlist, opsize, OS_INT, hregister, indexreg);
{ create reference, indexreg := indexreg * sizeof(OS_ADDR) }
cg.a_op_const_reg(exprasmlist, OP_MUL, OS_INT, tcgsize2size[OS_ADDR], indexreg);
reference_reset_symbol(href, table, (-aint(min_)) * tcgsize2size[OS_ADDR]);
href.index := indexreg;
cg.a_load_ref_reg(exprasmlist, OS_INT, OS_INT, href, indexreg);
exprasmlist.concat(taicpu.op_reg(A_MTCTR, indexreg));
exprasmlist.concat(taicpu.op_none(A_BCTR));
{ generate jump table }
new_section(current_procinfo.aktlocaldata,sec_data,current_procinfo.procdef.mangledname,sizeof(aint));
current_procinfo.aktlocaldata.concat(Tai_label.Create(table));
last:=min_;
genitem(current_procinfo.aktlocaldata,hp);
end;
procedure tppccasenode.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
exprasmlist.concat(taicpu.op_reg_reg_const(A_ADDIC_,hregister,
hregister,value))
else
begin
tmpreg := cg.getintregister(exprasmlist,OS_INT);
cg.a_load_const_reg(exprasmlist,OS_INT,value,tmpreg);
exprasmlist.concat(taicpu.op_reg_reg_reg(A_ADD_,hregister,
hregister,tmpreg));
end;
end;
begin
if assigned(t^.less) then
genitem(t^.less);
{ need we to test the first value }
if first and (t^._low>get_min_value(left.resulttype.def)) then
begin
cg.a_cmp_const_reg_label(exprasmlist,OS_INT,jmp_lt,aword(t^._low),hregister,elselabel);
end;
if t^._low=t^._high then
begin
if t^._low-last=0 then
cg.a_cmp_const_reg_label(exprasmlist, opsize, OC_EQ,0,hregister,blocklabel(t^.blockid))
else
gensub(longint(t^._low-last));
tcgppc(cg).a_jmp_cond(exprasmlist,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.resulttype.def)) then
gensub(longint(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(t^._low-last));
if ((t^._low-last) <> 1) or
(not lastrange) then
tcgppc(cg).a_jmp_cond(exprasmlist,jmp_lt,elselabel);
end;
gensub(longint(t^._high-t^._low));
tcgppc(cg).a_jmp_cond(exprasmlist,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 = OS_32) then
genlinearcmplist(hp)
else
begin
last:=0;
lastrange:=false;
first:=true;
genitem(hp);
cg.a_jmp_always(exprasmlist,elselabel);
end;
end;
begin
ccasenode:=tppccasenode;
end.
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