Date: Wed, 12 Sep 2001 22:59:38 +1000 (EST) From: Bruce Evans <bde@zeta.org.au> To: Marcel Moolenaar <marcel@xcllnt.net> Cc: "Brian F. Feldman" <green@FreeBSD.org>, Mark Murray <mark@grondar.za>, Peter Wemm <peter@FreeBSD.org>, <cvs-committers@FreeBSD.org>, <cvs-all@FreeBSD.org> Subject: Re: cvs commit: src/sys/kern subr_prf.c src/sys/sys systm.h Message-ID: <20010912225508.W1472-100000@delplex.bde.org> In-Reply-To: <20010911170706.A22997@kayak.xcllnt.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, 11 Sep 2001, Marcel Moolenaar wrote: > On Wed, Sep 12, 2001 at 12:30:50AM +1000, Bruce Evans wrote: > > Disagreed. This seems like a normal optimization to me. It's like > > replacing strlen("foo") by 3. > > None of the so called optimizations are normal in that normally you > optimize those parts of the program where you have the largest gain > for the least amount of effort. Replacing strlen("foo") by 3 only > marginally makes more sense. In any case, I don't believe that GCC > is at a point where all the big/significant optimizations have been > implemented, so I fail to see how these optimizations make the code > better. I don't see value in the fact that my scientific program may > be twice as slow as the competition, but at least the result is printed > 7 clocks earlier. Right. I didn't say that it was a worthwhile optimization :-). It's just an easy one, and has the advantages of being machine-independent and actually an optimization on all machines (that's for strlen; printf --> putchar might be a pessimization if putchar is poorly implemented). Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20010912225508.W1472-100000>