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From: Carlos Munoz <carlos@kenati.com>
To: Al Viro <viro@ftp.linux.org.uk>
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 12:04:56 -0800	[thread overview]
Message-ID: <4411DBE8.2070302@kenati.com> (raw)
In-Reply-To: <20060310191842.GY27946@ftp.linux.org.uk>

Al Viro wrote:

>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...
>  
>
Hi Al,

You are right, so easy. I will look at the data sheet and make sure the 
same approach can be applied to all places calling for log10 
calculations. I wonder why the data sheet calls for log10 calculations. 
It threw me off... should have know better though.

Thanks,


Carlos Munoz

  reply	other threads:[~2006-03-10 20:00 UTC|newest]

Thread overview: 20+ 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  3:25       ` 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 18:03               ` Carlos Munoz
2006-03-10 18:33                 ` linux-os (Dick Johnson)
2006-03-10 18:41                   ` Ben Slusky
2006-03-10 19:18                 ` Al Viro
2006-03-10 20:04                   ` Carlos Munoz [this message]
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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