Hello everyone,
I have wrote some code which require faster speed which I select to write in
inline assembler code. I want the speed, but I don't have good memory, so I
would rather have pascal code to help me recall the logic, also enjoy the
benefit for upgrading to a different CPU by simply switching to pascal code.
Who knows what will happen next year.
I have read some code in system.pas. It seems that Borland select to use
condition define PUREPASCAL to maintain Delphi code with equivalant inline
assembler code.
I also thought there are two other methods.
---------------------------------------------------------------------
One is put pascal code in comments
i.e.
function _BeforeDestruction(Instance: TObject; OuterMost: ShortInt):
TObject;
{
// Must preserve DL on return!
begin
Result := Instance;
if OuterMost > 0 then Exit;
Instance.BeforeDestruction;
end;
}
asm
{ -> EAX = pointer to instance }
{ DL = dealloc flag }
TEST DL,DL
JG @@outerMost
RET
@@outerMost:
PUSH EAX
PUSH EDX
MOV EDX,[EAX]
CALL DWORD PTR [EDX] + VMTOFFSET TObject.BeforeDestruction
POP EDX
POP EAX
end;
----------------------------------------------------------------------------
---------------------
Another is put both code in the source with a different function name.
i.e.
function _BeforeDestruction(Instance: TObject; OuterMost: ShortInt):
TObject;
begin
Result := Instance;
if OuterMost > 0 then Exit;
Instance.BeforeDestruction;
end;
function _BeforeDestruction_pascal(Instance: TObject; OuterMost: ShortInt):
TObject;
asm
{ -> EAX = pointer to instance }
{ DL = dealloc flag }
TEST DL,DL
JG @@outerMost
RET
@@outerMost:
PUSH EAX
PUSH EDX
MOV EDX,[EAX]
CALL DWORD PTR [EDX] + VMTOFFSET TObject.BeforeDestruction
POP EDX
POP EAX
end;
I like all the source code to be compiled, but don't put useless code into
executeable. But Borland way, means that I have to maintain two project
files and put in a project group to let them compile at once. It seems that
memory not release after finish compiling one project still exist in Delphi
7 and Kylix 3. So that option reqired me to do a full rebuild, then have to
shutdown Delphi and restart, in Kylix case worse, I have to restart Linux to
get fresh clean.
I look forward to hearing from you.
TIA
Regards
Leigh
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