Hi John, mspgcc-users-boun...@lists.sourceforge.net wrote on 19.07.2006 21:12:11: > Message: 2 > Date: Wed, 19 Jul 2006 18:52:45 +0100 > From: "John Pote" <johnp...@blueyonder.co.uk> > Subject: Re: [Mspgcc-users] Libmath: powf() and logf() are too slow > > I cannot point you in the direction of a 'quick' readily available > library but here are some thoughts that might help. > > a) logf((float)v / 10000.0) is an identity with ( ie an = with 3 > lines) logf((float)v) - k where k=logf(10000.0)
the division by 10000 is a relict from timing the "lenght". in real life the operation is a pure logf() from a float variable. Yesterday i've tested an algorithm from FXTBOOK and thus could cut the calculation time down to about 5 ms for each function. (error < 3% ; for 5 iterations) But thats still not the point where i want to be .... *aehm* ... where the timing of the SPS wants me to be. ;-/ Ciao, Helmut
