[C674x] Confrim IFFT performance data

If you installed DSPLIB for C647X and you look at directory docs (this is a sub-directory of where you installed the library) there is a file called DSPLIB_C674x_TestReport.html

Open it and you see two tables, for two different formats. Each table has the function name and performances either in a formula or with numbers

In the tables look for DSPF_sp_ifftSPxSP   I believe that this is what you are looking for.   If you need a different size you can extrapolate the value remembering that FFT as well as IFFT performances go with n*log(n) where n is the number of elements and the log is base two

Ran

Hi,

Thanks for your post.

Kindly check the performance benchmarks for the IFFT functions for c64x+ DSP from the DSPLIB reference guide below, but applicable only for fixed point operations and doesn't support floating point.

DSP_ifft16x16

DSP_ifft16x16_imre

DSP_ifft16x32

DSP_ifft32x32

http://www.ti.com/lit/ug/sprueb8b/sprueb8b.pdf (page nos: 53 to 60)

In general, the IFFT benchmark cycles can be computed using the formula below:

(6 * nx/8 + 19) * ceil[log4(nx) − 1] + 8 * nx/8 + 30 (Inverse Mixed Radix 16 x 16-bit FFT With Im/Re Order)

(12.5 * nx/8 + 30) * ceil[log4(nx) − 1] + 6 * nx/4 + 32 (Inverse Mixed radix N x 32-bit FFT with rounding)

http://www.ti.com/lit/ug/spruec5/spruec5.pdf

Also, check the FFT benchmark data from the wiki below for c674x:

http://processors.wiki.ti.com/index.php/Efficient_FFT_Computation_of_Real_Input#BenchMark

as well, the app. report below for implementing IFFT algorithms:

http://www.ti.com/lit/an/spra291/spra291.pdf

Refer the e2e post below as well:

https://e2e.ti.com/support/embedded/tirtos/f/355/t/244592

Thanks & regards,

Sivaraj K

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OOPS
In my response from above I had a typo. I wrote C647 and not C674

But the posting is correct, you can look at the table in the release, or even in this URL -

software-dl.ti.com/.../DSPLIB_C674x_TestReport.html

Ran