Date: Mon, 5 Jun 2000 18:42:01 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: Anatoly Vorobey <mellon@pobox.com> Cc: "Daniel C. Sobral" <dcs@newsguy.com>, hackers@FreeBSD.ORG Subject: Re: Optimization Message-ID: <200006060142.SAA89210@apollo.backplane.com> References: <20000606031706.A41154@happy.checkpoint.com> <200006060031.JAA00841@daniel.sobral> <20000606035948.A41527@happy.checkpoint.com>
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cc -S -O2 x.c
struct u {
short a;
short b;
};
struct u table[256];
void
fubar(int i)
{
register struct u value = table[i];
fubar2(value.a, value.b);
}
But, as I said, spending all your time trying to optimize out a few
5 nS instructions here and there is a supreme waste of time. It
will lull you into a false sense of performance and cause you to miss
more obvious performance issues.
-Matt
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