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Fast logarithm on DSP C6711

Started by Rouxel, Jeanmarc ●January 22, 2001
Fast logarithm on DSP C6711

Hello everybody,
I try to use a 'log' function in my project, but I want this function the fastest as possible. So, I don't want to use the TI DSPLIB's function.

Has somebody an algorithm (in ASM for example) for implementing a fast logarithm for the target DSP 320C6711 ?
Thanks.

Jean-Marc ROUXEL.




Reply by Andrew V. Nesterov ●January 23, 20012001-01-23

Hi Jean-Marc,

We (Generic Digital Design Inc.) have an optimized library of
math functions for C67x floating-point DSP.

After assembly optimization our log function squized TI's 138 cycles
into 80 cycles, computing logarithm with the same accuracy level.

Performance figures shown are for single precision data.

Regards,

Andrew

> Date: Mon, 22 Jan 2001 12:04:32 +0100
> From: "Rouxel, Jeanmarc" <>
> Subject: Fast logarithm on DSP C6711
>
> Hello everybody,
> I try to use a 'log' function in my project, but I want this function the
> fastest as possible. So, I don't want to use the TI DSPLIB's function.
> Has somebody an algorithm (in ASM for example) for implementing a fast
> logarithm for the target DSP 320C6711 ?
> Thanks.
>
> Jean-Marc ROUXEL.
>