From: Al Viro <viro@ftp.linux.org.uk>
To: Carlos Munoz <carlos@kenati.com>
Cc: Denis Vlasenko <vda@ilport.com.ua>,
Lee Revell <rlrevell@joe-job.com>,
Valdis.Kletnieks@vt.edu, linux-kernel@vger.kernel.org,
alsa-devel <alsa-devel@lists.sourceforge.net>
Subject: Re: How can I link the kernel with libgcc ?
Date: Fri, 10 Mar 2006 19:18:42 +0000 [thread overview]
Message-ID: <20060310191842.GY27946@ftp.linux.org.uk> (raw)
In-Reply-To: <4411BF8E.4080306@kenati.com>
On Fri, Mar 10, 2006 at 10:03:58AM -0800, Carlos Munoz wrote:
> > ydef[22] = (u_int32_t)(log10((double)(over & 0x0000003f)) /
> > log10(2));
You've got to be kidding. Let's take a good look at that expression:
log10(x)/log10(2) is what? Right, base-2 logarithm of x. Then you cast
it to unsigned, i.e. round it down. In other words, you want to know the
highest bit in (over & 0x3f). Which is to say, (fls(over & 0x3f) - 1).
Sigh...
next prev parent reply other threads:[~2006-03-10 19:18 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-10 1:44 How can I link the kernel with libgcc ? Carlos Munoz
2006-03-10 1:45 ` Valdis.Kletnieks
2006-03-10 2:06 ` Lee Revell
2006-03-10 3:01 ` Carlos Munoz
2006-03-10 3:22 ` Lee Revell
2006-03-10 3:22 ` Lee Revell
2006-03-10 3:25 ` Carlos Munoz
2006-03-10 3:25 ` Lee Revell
2006-03-10 3:47 ` Carlos Munoz
2006-03-10 10:37 ` Denis Vlasenko
2006-03-10 11:05 ` Bart Hartgers
2006-03-10 11:05 ` Bart Hartgers
2006-03-10 18:03 ` Carlos Munoz
2006-03-10 18:33 ` linux-os (Dick Johnson)
2006-03-10 18:33 ` linux-os (Dick Johnson)
2006-03-10 18:41 ` Ben Slusky
2006-03-10 19:18 ` Al Viro [this message]
2006-03-10 20:04 ` Carlos Munoz
2006-03-10 11:55 ` James Courtier-Dutton
2006-03-10 10:18 ` Jes Sorensen
2006-03-10 18:07 ` Carlos Munoz
2006-03-10 8:01 ` Arjan van de Ven
2006-03-10 2:02 ` Lee Revell
[not found] <5OEVB-3GX-15@gated-at.bofh.it>
2006-03-10 2:32 ` Robert Hancock
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