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{
Copyright (c) 2016 by the Free Pascal development team
Generate m68k assembler for in set/case labels
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 n68kset;
{$i fpcdefs.inc}
interface
uses
globtype,
symtype,
cgbase,cpuinfo,cpubase,
node,nset,ncgset;
type
tcpucasenode = class(tcgcasenode)
procedure genlinearlist(hp : pcaselabel); override;
end;
implementation
uses
systems,globals,
cutils,verbose,
symdef,paramgr,
aasmtai,aasmdata,
nflw,constexp,
cgutils,cgobj,hlcgobj,
defutil,cgcpu;
procedure tcpucasenode.genlinearlist(hp : pcaselabel);
var
first : boolean;
last : TConstExprInt;
scratch_reg: tregister;
newsize: tcgsize;
newdef: tdef;
procedure genitem(t : pcaselabel);
begin
if assigned(t^.less) then
genitem(t^.less);
{ do we need to test the first value? }
if first and (t^._low>get_min_value(left.resultdef)) then
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,opsize,jmp_lt,tcgint(t^._low.svalue),hregister,elselabel);
if t^._low=t^._high then
begin
if t^._low-last=0 then
hlcg.a_cmp_const_reg_label(current_asmdata.CurrAsmList,opsize,OC_EQ,0,hregister,blocklabel(t^.blockid))
else
begin
hlcg.a_op_const_reg(current_asmdata.CurrAsmList, OP_SUB, opsize, tcgint(t^._low.svalue-last.svalue), hregister);
tcg68k(cg).a_jmp_cond(current_asmdata.CurrAsmList,OC_EQ,blocklabel(t^.blockid));
end;
last:=t^._low;
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
hlcg.a_op_const_reg(current_asmdata.CurrAsmList, OP_SUB, opsize, tcgint(t^._low.svalue), hregister);
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: }
hlcg.a_op_const_reg(current_asmdata.CurrAsmList, OP_SUB, opsize, tcgint(t^._low.svalue-last.svalue), hregister);
tcg68k(cg).a_jmp_cond(current_asmdata.CurrAsmList, jmp_lt, elselabel);
end;
hlcg.a_op_const_reg(current_asmdata.CurrAsmList, OP_SUB, opsize, tcgint(t^._high.svalue-t^._low.svalue), hregister);
tcg68k(cg).a_jmp_cond(current_asmdata.CurrAsmList, jmp_le, blocklabel(t^.blockid));
last:=t^._high;
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)) then
genlinearcmplist(hp)
else
begin
{ sign/zero extend the value to a full register before starting to
subtract values, so that on platforms that don't have
subregisters of the same size as the value we don't generate
sign/zero-extensions after every subtraction
make newsize always signed, since we only do this if the size in
bytes of the register is larger than the original opsize, so
the value can always be represented by a larger signed type }
newsize:=tcgsize2signed[reg_cgsize(hregister)];
if tcgsize2size[newsize]>opsize.size then
begin
newdef:=cgsize_orddef(newsize);
scratch_reg:=hlcg.getintregister(current_asmdata.CurrAsmList,newdef);
hlcg.a_load_reg_reg(current_asmdata.CurrAsmList,opsize,newdef,hregister,scratch_reg);
hregister:=scratch_reg;
opsize:=newdef;
end;
last:=0;
first:=true;
genitem(hp);
hlcg.a_jmp_always(current_asmdata.CurrAsmList,elselabel);
end;
end;
begin
ccasenode:=tcpucasenode;
end.
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