dpaulson

Updated Single Precision FFTW3 to ACML 5.2 Wrappers

Discussion created by dpaulson on Sep 18, 2012

Several bugs were found in the real to complex and complex to real FFTW3 APIs wrapped in ACML 5.2.

 

1. In-place transformations did not work correctly.

2. The scaling factor that FFTW3 applies to the transforms was not applied.

  • FFTW3 R2C,C2R outputs are scaled by sqrt(number of inputs)

 

This affected the following FFTW3 plans:

 

  • fftwf_plan_dft_r2c_1d
  • fftwf_plan_dft_r2c_2d
  • fftwf_plan_dft_r2c_3d
  • fftwf_plan_dft_c2r_1d
  • fftwf_plan_dft_c2r_2d
  • fftwf_plan_dft_c2r_3d

 

fftwf_alloc_real and fftwf_alloc_complex are also now wrapped.

 

The attached tar file can be extracted to the examples/FFTW_wrappers/FFTW3 folder in your ACML installation and rebuilt.

 

Stay tuned for double precision wrappers in the near future.

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