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{
Copyright (c) 1998-2002 by Florian Klaempfl
Generate arm 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 narmset;
{$i fpcdefs.inc}
interface
uses
globtype,
node,nset,pass_1,ncgset;
type
tarmcasenode = class(tcgcasenode)
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,
aasmbase,aasmtai,aasmdata,aasmcpu,
cgbase,pass_2,
ncon,
cpubase,cpuinfo,procinfo,
cgutils,cgobj,ncgutil,
cgcpu;
{*****************************************************************************
TARMCASENODE
*****************************************************************************}
procedure tarmcasenode.optimizevalues(var max_linear_list:aint;var max_dist:aword);
begin
inc(max_linear_list,2)
end;
function tarmcasenode.has_jumptable : boolean;
begin
has_jumptable:=true;
end;
procedure tarmcasenode.genjumptable(hp : pcaselabel;min_,max_ : aint);
var
last : TConstExprInt;
indexreg : tregister;
href : treference;
tablelabel: TAsmLabel;
procedure genitem(list:TAsmList;t : pcaselabel);
var
i : aint;
begin
if assigned(t^.less) then
genitem(list,t^.less);
{ fill possible hole }
for i:=last.svalue+1 to t^._low.svalue-1 do
list.concat(Tai_const.Create_sym(elselabel));
for i:=t^._low.svalue to t^._high.svalue do
list.concat(Tai_const.Create_sym(blocklabel(t^.blockid)));
last:=t^._high.svalue;
if assigned(t^.greater) then
genitem(list,t^.greater);
end;
procedure genitem_thumb2(list:TAsmList;t : pcaselabel);
var
i : aint;
begin
if assigned(t^.less) then
genitem_thumb2(list,t^.less);
{ fill possible hole }
for i:=last.svalue+1 to t^._low.svalue-1 do
list.concat(Tai_const.Create_rel_sym(aitconst_half16bit,tablelabel,elselabel));
for i:=t^._low.svalue to t^._high.svalue do
list.concat(Tai_const.Create_rel_sym(aitconst_half16bit,tablelabel,blocklabel(t^.blockid)));
last:=t^._high.svalue;
if assigned(t^.greater) then
genitem_thumb2(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(current_asmdata.CurrAsmList,opsize,jmp_lt,aint(min_),hregister,elselabel);
{ case expr greater than max_ => goto elselabel }
cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,opsize,jmp_gt,aint(max_),hregister,elselabel);
end;
{ make it a 32bit register }
indexreg:=cg.makeregsize(current_asmdata.CurrAsmList,hregister,OS_INT);
cg.a_load_reg_reg(current_asmdata.CurrAsmList,opsize,OS_INT,hregister,indexreg);
if current_settings.cputype in cpu_thumb2 then
begin
{ adjust index }
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SUB,OS_ADDR,min_,indexreg,indexreg);
{ create reference and generate jump table }
reference_reset(href,4);
href.base:=NR_PC;
href.index:=indexreg;
href.shiftmode:=SM_LSL;
href.shiftimm:=1;
current_asmdata.CurrAsmList.Concat(taicpu.op_ref(A_TBH,href));
{ generate jump table }
current_asmdata.getjumplabel(tablelabel);
cg.a_label(current_asmdata.CurrAsmList,tablelabel);
last:=min_;
genitem_thumb2(current_asmdata.CurrAsmList,hp);
end
else
begin
{ adjust index }
cg.a_op_const_reg_reg(current_asmdata.CurrAsmList,OP_SUB,OS_ADDR,min_+1,indexreg,indexreg);
{ create reference and generate jump table }
reference_reset(href,4);
href.base:=NR_PC;
href.index:=indexreg;
href.shiftmode:=SM_LSL;
href.shiftimm:=2;
cg.a_load_ref_reg(current_asmdata.CurrAsmList,OS_ADDR,OS_ADDR,href,NR_PC);
{ generate jump table }
last:=min_;
genitem(current_asmdata.CurrAsmList,hp);
end;
end;
procedure tarmcasenode.genlinearlist(hp : pcaselabel);
var
first : boolean;
lastrange : boolean;
last : TConstExprInt;
cond_lt,cond_le : tresflags;
procedure genitem(t : pcaselabel);
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.resultdef)) then
begin
cg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,opsize,jmp_lt,aint(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, opsize, OC_EQ,0,hregister,blocklabel(t^.blockid))
else
begin
tcgarm(cg).cgsetflags:=true;
cg.a_op_const_reg(current_asmdata.CurrAsmList, OP_SUB, opsize, aint(int64(t^._low-last)), hregister);
tcgarm(cg).cgsetflags:=false;
cg.a_jmp_flags(current_asmdata.CurrAsmList,F_EQ,blocklabel(t^.blockid));
end;
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
begin
tcgarm(cg).cgsetflags:=true;
cg.a_op_const_reg(current_asmdata.CurrAsmList, OP_SUB, opsize, aint(int64(t^._low)), hregister);
tcgarm(cg).cgsetflags:=false;
end;
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: }
tcgarm(cg).cgsetflags:=true;
cg.a_op_const_reg(current_asmdata.CurrAsmList, OP_SUB, opsize, aint(int64(t^._low-last)), hregister);
tcgarm(cg).cgsetflags:=false;
{ no jump necessary here if the new range starts at }
{ at the value following the previous one }
if ((t^._low-last) <> 1) or
(not lastrange) then
cg.a_jmp_flags(current_asmdata.CurrAsmList,cond_lt,elselabel);
end;
tcgarm(cg).cgsetflags:=true;
cg.a_op_const_reg(current_asmdata.CurrAsmList,OP_SUB,opsize,aint(int64(t^._high-t^._low)),hregister);
tcgarm(cg).cgsetflags:=false;
cg.a_jmp_flags(current_asmdata.CurrAsmList,cond_le,blocklabel(t^.blockid));
last:=t^._high;
lastrange:=true;
end;
first:=false;
if assigned(t^.greater) then
genitem(t^.greater);
end;
begin
if with_sign then
begin
cond_lt:=F_LT;
cond_le:=F_LE;
end
else
begin
cond_lt:=F_CC;
cond_le:=F_LS;
end;
{ do we need to generate cmps? }
if (with_sign and (min_label<0)) 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:=tarmcasenode;
end.
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