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+ RegModifiedBetween

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git-svn-id: trunk@22216 -
This commit is contained in:
florian 2012-08-23 21:03:14 +00:00
parent 85765364ee
commit ca5078f9cf
1 changed files with 15 additions and 0 deletions
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15
compiler/aoptbase.pas
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@ -91,6 +91,9 @@ unit aoptbase;
{ returns true if reg is used by any instruction between p1 and p2 }
Function RegUsedBetween(reg: TRegister; p1, p2: tai): Boolean;
{ returns true if reg is modified by any instruction between p1 and p2 }
function RegModifiedBetween(reg: TRegister; p1, p2: tai): Boolean;
end;
function labelCanBeSkipped(p: tai_label): boolean;
@ -255,6 +258,18 @@ unit aoptbase;
end;
Function TAOptBase.RegModifiedBetween(reg : TRegister;p1,p2 : tai) : Boolean;
Begin
Result:=false;
while assigned(p1) and assigned(p2) and GetNextInstruction(p1,p1) and (p1<>p2) do
if RegModifiedByInstruction(reg,p1) then
begin
Result:=true;
exit;
end;
end;
{ ******************* Processor dependent stuff *************************** }
Function TAOptBase.RegMaxSize(Reg: TRegister): TRegister;