From: Rob Landley <rob@landley.net>
To: musl@lists.openwall.com
Cc: musl@lists.openwall.com
Subject: Re: ARM optimisations
Date: Mon, 04 Mar 2013 12:55:01 -0600 [thread overview]
Message-ID: <1362423301.29250.16@driftwood> (raw)
In-Reply-To: <20130302062102.GP20323@brightrain.aerifal.cx> (from dalias@aerifal.cx on Sat Mar 2 00:21:02 2013)
On 03/02/2013 12:21:02 AM, Rich Felker wrote:
> > systems aren't that common. (They existed, the tin can tools nail
> > board used one, but the generic C code works for them. Point is I'm
> > not sure they're worth _optimizing_ for if it costs the vast
> > majority of systems a 25% performance hit and we don't want to
> > maintain multiple versions. If you _have_ an armv5 version, the
> > armv4 one won't/shouldn't get much testing.)
>
> Can you explain why you think a version that's v4 compatible will be
> that much slower? If so, v5 code can be used as long as it checks
> __hwcap and falls back to a simple working version...
Alas, I do not have recent benchmarks. The timesys guys benched various
stuff in 2006 and that's where I grabbed the 25% figure. I mostly test
under qemu, where benchmarks are meaningless for real hardware.
If I'm in error, ignore me.
Rob
next prev parent reply other threads:[~2013-03-04 18:55 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-28 23:15 Andre Renaud
2013-02-28 23:30 ` Rich Felker
2013-03-02 4:33 ` Rob Landley
2013-03-02 6:21 ` Rich Felker
2013-03-04 18:55 ` Rob Landley [this message]
2013-03-02 11:34 ` Szabolcs Nagy
2013-03-02 20:33 ` Andre Renaud
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