Intel® Integrated Performance Primitives
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ippsFFTGetSize_C_32fc pBufferSize Question

Treph
Beginner
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Hi,

I am using ippsFFTGetSize_C_32fc() to size for a FFT with an order of 19. The pBufferSize calculated is 262,208. However, if I size a FFT with an order of 18, the pBufferSize is 2,097,216. I expect the larger FFT order to calculate a larger pBufferSize. Is this assumption incorrect?

-Treph

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Gennady_F_Intel
Moderator
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Treph, what version of IPP did you try? Checking this case with the latest 2018 u1 version of IPP, I see the follows results

ffttest.exe
major = 2018
minor = 0
majorBuild = 1
build = 56998
targetCpu = y8
Name = ippSP SSE4.2 (y8)
Version = 2018.0.1 (r56998)
BuildDate = Oct 10 2017
 ..................... FFTOrder == 18 ................
 ..................... FFTOrder == 18, sizeBuffer == 131136 ................

 

testftt.exe
major = 2018
minor = 0
majorBuild = 1
build = 56998
targetCpu = y8
Name = ippSP SSE4.2 (y8)
Version = 2018.0.1 (r56998)
BuildDate = Oct 10 2017
 ..................... FFTOrder == 19 ................
 ..................... FFTOrder == 19, sizeBuffer == 262208 ................
 
--Gennady
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Treph
Beginner
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Hi Gennady,

Thanks for your reply. I checked the ippversion.h file, and the version string is "9.0.3".

-Treph

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Chao_Y_Intel
Moderator
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Treph, could you check the new release of IPP? and see if it still an issue for you?

thanks,
Chao

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