Date: Mon, 9 Jan 2012 20:46:33 -0800 (PST) From: Pedro Giffuni <pfg@freebsd.org> To: John-Mark Gurney <jmg@funkthat.com> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org Subject: Re: svn commit: r229415 - head/lib/libvgl Message-ID: <1326170793.59968.YahooMailClassic@web113503.mail.gq1.yahoo.com> In-Reply-To: <20120110040219.GE52468@funkthat.com>
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Hi John;
--- Lun 9/1/12, John-Mark Gurney <jmg@funkthat.com> ha scritto:
...
> Pedro F. Giffuni wrote this message
> on Tue, Jan 03, 2012 at 19:47 +0000:
> > +#define SL_SWAP(a,b)
> {a^=b; b^=a; a^=b;}
>
> Can we replace this w/ a normal swap function?
>
> Last time I did benchmarking on this ~10 years ago, it was
> slower to use xor instead of using assignments...
>
I doubt it's worth it, the swapping is not critical here and
doing a swap saves a temporary variable (not that they are
expensive either).
cheers,
Pedro.
> --
> John-Mark Gurney
>
> Voice: +1 415 225 5579
>
> "All that I will do, has been
> done, All that I have, has not."
>
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