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Discussion Groups | TMS320C6x | bit_rev is too slow when fft

Technical discussions about the TI C6000 DSPs (including the c62x, c64x and c67x DSPs).

  

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bit_rev is too slow when fft - Xuchen Yao - Aug 15 9:49:36 2007

Hi,

Using C67x DSP library, whenever we perform FFT, like DSPF_sp_cfftr2_dit()
or DSPF_sp_icfftr2_dif(), we must use bit_rev(). But bit_rev() is not in the
DSP library, what I get is only C code written in "TMS320C67x DSP Library
Programmer's Reference Guide". After some profiling, I found it extremely
slow. Do we have ASM code for this function? Thank you.

Xuchen
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Re: bit_rev is too slow when fft - Andrew Elder - Aug 15 12:19:28 2007

See DSPF_sp_bitrev_cplx()

--- Xuchen Yao <y...@163.com> wrote:

> Hi,
> 
> Using C67x DSP library, whenever we perform FFT,
> like DSPF_sp_cfftr2_dit()
> or DSPF_sp_icfftr2_dif(), we must use bit_rev(). But
> bit_rev() is not in the
> DSP library, what I get is only C code written in
> "TMS320C67x DSP Library
> Programmer's Reference Guide". After some profiling,
> I found it extremely
> slow. Do we have ASM code for this function? Thank
> you.
> 
> Xuchen

     
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RE: bit_rev is too slow when fft - Xuchen Yao - Aug 16 9:25:13 2007

Yes, that works! Thank you very much.

Xuchen

________________________________________
From: c...@yahoogroups.com [mailto:c...@yahoogroups.com] On Behalf Of Andrew
Elder
Sent: Thursday, August 16, 2007 12:12 AM
To: Xuchen Yao; c...@yahoogroups.com
Subject: Re: [c6x] bit_rev is too slow when fft
See DSPF_sp_bitrev_cplx()

--- Xuchen Yao <y...@163.com> wrote:

> Hi,
> 
> Using C67x DSP library, whenever we perform FFT,
> like DSPF_sp_cfftr2_dit()
> or DSPF_sp_icfftr2_dif(), we must use bit_rev(). But
> bit_rev() is not in the
> DSP library, what I get is only C code written in
> "TMS320C67x DSP Library
> Programmer's Reference Guide". After some profiling,
> I found it extremely
> slow. Do we have ASM code for this function? Thank
> you.
> 
> Xuchen

__________________________________________________________
Park yourself in front of a world of choices in alternative vehicles. Visit
the Yahoo! Auto Green Center.
http://autos.yahoo.com/green_center/
______________________________
New Code Sharing Section now Live on DSPRelated.com. Learn about the Reward Program for Contributors here.



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