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* optimize TAOptObj.UpdateUsedRegs to avoid multiple passes through the asmlist

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git-svn-id: trunk@21513 -
This commit is contained in:
florian 2012-06-07 15:19:55 +00:00
parent 572012fad3
commit 72746e635d
1 changed files with 27 additions and 2 deletions
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29
compiler/aoptobj.pas
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@ -359,6 +359,8 @@ Unit AoptObj;
}
Procedure TUsedRegs.Update(p: Tai);
Begin
{ this code is normally not used because updating the register allocation information is done in
TAOptObj.UpdateUsedRegs for speed reasons }
repeat
while assigned(p) and
((p.typ in (SkipInstr - [ait_RegAlloc])) or
@ -825,8 +827,31 @@ Unit AoptObj;
var
i : TRegisterType;
begin
for i:=low(TRegisterType) to high(TRegisterType) do
UsedRegs[i].Update(p);
{ this code is based on TUsedRegs.Update to avoid multiple passes through the asmlist,
the code is duplicated here }
repeat
while assigned(p) and
((p.typ in (SkipInstr - [ait_RegAlloc])) or
((p.typ = ait_label) and
labelCanBeSkipped(tai_label(p))) or
((p.typ = ait_marker) and
(tai_Marker(p).Kind in [mark_AsmBlockEnd,mark_NoLineInfoStart,mark_NoLineInfoEnd]))) do
p := tai(p.next);
while assigned(p) and
(p.typ=ait_RegAlloc) Do
begin
case tai_regalloc(p).ratype of
ra_alloc :
Include(UsedRegs[getregtype(tai_regalloc(p).reg)].UsedRegs, getsupreg(tai_regalloc(p).reg));
ra_dealloc :
Exclude(UsedRegs[getregtype(tai_regalloc(p).reg)].UsedRegs, getsupreg(tai_regalloc(p).reg));
end;
p := tai(p.next);
end;
until not(assigned(p)) or
(not(p.typ in SkipInstr) and
not((p.typ = ait_label) and
labelCanBeSkipped(tai_label(p))));
end;