This is the mail archive of the libc-hacker@sources.redhat.com mailing list for the glibc project.

Note that libc-hacker is a closed list. You may look at the archives of this list, but subscription and posting are not open.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]

Re: PATCH: powerpc/strchr.S for BPs

To: Geoff Keating <geoffk at cygnus dot com>
Subject: Re: PATCH: powerpc/strchr.S for BPs
From: Greg McGary <greg at mcgary dot org>
Date: 24 Jul 2000 03:43:40 -0700
Cc: libc-hacker at sourceware dot cygnus dot com
References: <200007220836.BAA25479@kayak.mcgary.org> <200007230357.UAA00545@localhost.cygnus.com> <ms1z0lnrhc.fsf@mcgary.org>

Greg McGary <greg@mcgary.org> writes:

> OK, I benchmarked it, and the upshot is that the overhead is in the
> noise at approx 0.8%.

Oops.  Wrongo.  I was off by an order of magnitude.  The slowdown is 8%.

> I suspected this all along, but didn't feel
> like arguing, because it would just come across as whining. 8^)
> Let this be an instructive case regarding optimizing for micro-efficiencies.

Let this be a lesson hasty interpretation of results.

Greg

References:
- PATCH: powerpc/strchr.S for BPs
  - From: Greg McGary
- Re: PATCH: powerpc/strchr.S for BPs
  - From: Greg McGary

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]