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From: perry@madnix.UUCP (Perry Kivolowitz)
Newsgroups: comp.sys.amiga
Subject: Re: shared/loaded libraries vs. resident
Message-ID: <618@madnix.UUCP>
Date: 22 Apr 89 10:02:47 GMT
References: <13492@louie.udel.EDU> <8635@polya.Stanford.EDU>
Reply-To: perry@madnix.UUCP (Perry Kivolowitz)
Organization: ASDG Incorporated
Lines: 37

In article <8635@polya.Stanford.EDU> gilham@polya.Stanford.EDU (Fred Gilham) writes:
>The thing that concerns me about this is the performance hit.  I read
>somewhere that the cost of a library call is about 100us.  You really

Discounting the overhead of parameter passing a library call which in
C would like like so:

	Result = LibFoo();

will be translated into:

	move.l	_FooLibBase,A6
	jsr	LibFoosOffset(A6)

the next instruction to be executed would be:

	jmp	ToTheActualLibFooCode

and then...

	TheActualLibFooInstructions....

So...the overhead of a library call (irrespective of parameter passing
which would have to be accomplished if you were calling a function or
library) is quite low.

-----

Can anyone take the strain? Imagine...a non-commercial message from pk.
Next he'll be writing public domain software again.


-- 
                        Perry Kivolowitz, ASDG Inc.
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