From: Brad Midgley <bmidgley@xmission.com>
To: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] Elimination of pow() in SBC code
Date: Sat, 27 Nov 2004 19:38:25 -0700 [thread overview]
Message-ID: <41A93A21.1090809@xmission.com> (raw)
In-Reply-To: <1101599506.18467.6.camel@pegasus>
guys
that's a good idea to break the need for libm and for another
int->float->int conversion
> scalefactor[ch][sb] = pow(2.0, (frame->scale_factor[ch][sb] + 1));
>
> So what is the range of scale_factor[ch][sb]. From a quick testing a saw
> that it ranges from 0 - 15. Is this always true? If yes, then I would
> use a pre-calculated array for 2^x.
or like
scalefactor[ch][sb] = 4 << frame->scale_factor[ch][sb];
the compiler doesn't know about the limited range of scale_factor so it
may actually generate a loop here.
brad
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next prev parent reply other threads:[~2004-11-28 2:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-27 23:51 [Bluez-devel] Elimination of pow() in SBC code Marcel Holtmann
2004-11-28 1:57 ` Henryk Plötz
2004-11-28 12:15 ` Marcel Holtmann
2004-11-28 2:38 ` Brad Midgley [this message]
2004-11-28 13:32 ` Marcel Holtmann
2004-11-28 15:57 ` Brad Midgley
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