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* when inserting pc relative data blocks on arm thumb, avoid negative pc offsets, if needed, the data is copied

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a short test with the rtl shows that this happens exactly once in the rtl, so it is feasible to do so

git-svn-id: trunk@24413 -
This commit is contained in:
florian 2013-05-03 20:45:26 +00:00
parent 1f8192b6da
commit cec28ef512
2 changed files with 88 additions and 52 deletions
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6
compiler/aasmtai.pas
View File

@ -488,6 +488,9 @@ interface
{ set to true when the label has been moved by insertpcrelativedata to the correct location
so one label can be used multiple times }
moved : boolean;
{ true, if a label has been already inserted, this is important for arm thumb where no negative
pc relative offsets are allowed }
inserted : boolean;
{$endif arm}
constructor Create(_labsym : tasmlabel);
constructor ppuload(t:taitype;ppufile:tcompilerppufile);override;
@ -1945,7 +1948,7 @@ implementation
TAI_LABEL
****************************************************************************}
constructor tai_label.create(_labsym : tasmlabel);
constructor tai_label.Create(_labsym : tasmlabel);
begin
inherited Create;
typ:=ait_label;
@ -1976,7 +1979,6 @@ implementation
labsym.is_set:=true;
end;
{****************************************************************************
tai_comment comment to be inserted in the assembler file
****************************************************************************}

40
compiler/arm/aasmcpu.pas
View File

@ -873,6 +873,7 @@ implementation
limit: longint;
curop : longint;
curtai : tai;
ai_label : tai_label;
curdatatai,hp,hp2 : tai;
curdata : TAsmList;
l : tasmlabel;
@ -910,12 +911,31 @@ implementation
begin
{ pc relative symbol? }
curdatatai:=tai(taicpu(curtai).oper[curop]^.ref^.symboldata);
if assigned(curdatatai) and
if assigned(curdatatai) then
begin
{ create a new copy of a data entry on arm thumb if the entry has been inserted already
before because arm thumb does not allow pc relative negative offsets }
if (current_settings.cputype in cpu_thumb) and
tai_label(curdatatai).inserted then
begin
current_asmdata.getjumplabel(l);
hp:=tai_label.create(l);
listtoinsert.Concat(hp);
hp2:=tai(curdatatai.Next.GetCopy);
hp2.Next:=nil;
hp2.Previous:=nil;
listtoinsert.Concat(hp2);
taicpu(curtai).oper[curop]^.ref^.symboldata:=hp;
taicpu(curtai).oper[curop]^.ref^.symbol:=l;
curdatatai:=hp;
end;
{ move only if we're at the first reference of a label }
not(tai_label(curdatatai).moved) then
if not(tai_label(curdatatai).moved) then
begin
tai_label(curdatatai).moved:=true;
{ check if symbol already used. }
{ if yes, reuse the symbol }
hp:=tai(curdatatai.next);
removeref:=false;
@ -937,12 +957,13 @@ implementation
inc(extradataoffset,2*multiplier);
end;
end;
{ check if the same constant has been already inserted into the currently handled list,
if yes, reuse it }
if (hp.typ=ait_const) then
begin
hp2:=tai(curdata.first);
while assigned(hp2) do
begin
{ if armconstequal(hp2,hp) then }
if (hp2.typ=ait_const) and (tai_const(hp2).sym=tai_const(hp).sym)
and (tai_const(hp2).value=tai_const(hp).value) and (tai(hp2.previous).typ=ait_label)
then
@ -974,6 +995,7 @@ implementation
end;
end;
end;
end;
inc(curinspos,multiplier);
end;
ait_align:
@ -1065,6 +1087,18 @@ implementation
curdata.Insert(tai_align.Create(4));
curdata.insert(taicpu.op_sym(A_B,l));
curdata.concat(tai_label.create(l));
{ mark all labels as inserted, arm thumb
needs this, so data referencing an already inserted label can be
duplicated because arm thumb does not allow negative pc relative offset }
hp2:=tai(curdata.first);
while assigned(hp2) do
begin
if hp2.typ=ait_label then
tai_label(hp2).inserted:=true;
hp2:=tai(hp2.next);
end;
list.insertlistafter(curtai,curdata);
curtai:=hp;
end