Date: Tue, 11 Sep 2001 17:07:06 -0700 From: Marcel Moolenaar <marcel@xcllnt.net> To: Bruce Evans <bde@zeta.org.au> 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: <20010911170706.A22997@kayak.xcllnt.net> In-Reply-To: <20010912002041.J5036-100000@delplex.bde.org> References: <200109101458.f8AEwQI98441@green.bikeshed.org> <20010912002041.J5036-100000@delplex.bde.org>
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On Wed, Sep 12, 2001 at 12:30:50AM +1000, Bruce Evans wrote:
> On Mon, 10 Sep 2001, Brian F. Feldman wrote:
>
> > Mark Murray <mark@grondar.za> wrote:
> > > > This hack brought to you by some questionable ``optimizations'' in gcc-3.
> > > > gcc-3 takes it apon itself to convert:
> > > > printf("string\n") -> puts("string");
> > > > and:
> > > > printf("a"); -> putchar('a')
> > > > etc. I dont know what they've been smoking over there in gcc-land, but
> > > > it must be pretty good stuff.
> > >
>
> 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.
--
Marcel Moolenaar USPA: A-39004 marcel@xcllnt.net
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