Date: Sun, 21 Mar 2004 16:53:56 +1100 (EST) From: Andrew MacIntyre <andymac@bullseye.apana.org.au> To: Garance A Drosihn <drosih@rpi.edu> Cc: hackers@freebsd.org Subject: Re: Adventures with gcc: code vs object-code size Message-ID: <20040321164733.N33243@bullseye.apana.org.au> In-Reply-To: <p0602044cbc827481888c@[128.113.24.47]> References: <p0602044cbc827481888c@[128.113.24.47]>
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On Sat, 20 Mar 2004, Garance A Drosihn wrote:
> I am not a compilier guru, so I suspect it would take me hours to
> pin this down. I don't want to do that, so I'm wondering if anyone
> understands how such a minor code-change can POSSIBLY cause such a
> huge change in resulting object file... I also wonder if this same
> issue pops up in other programs, too.
I'm not a guru either, but I've seen a case where adding code (mostly
switch clauses) caused a size reduction (on i386 anyway)...
Depending on the optimisation level, it might be that the added code is
affecting the heuristics gcc is using for inlined functions etc.
--
Andrew I MacIntyre "These thoughts are mine alone..."
E-mail: andymac@bullseye.apana.org.au (pref) | Snail: PO Box 370
andymac@pcug.org.au (alt) | Belconnen ACT 2616
Web: http://www.andymac.org/ | Australia
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