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    • Heinz-Bernd Eggenstein's avatar
      Bug #1608: clFFT use of native_sin , native_cos can cause validation problems · 20314512
      Heinz-Bernd Eggenstein authored
      experimental: -added alternative method for twiddle factor calc, using a smaller LUT (256 * float2 )
                     via Taylor series to 3rd order, seems to be almost as accurate as method with 2 bigger LUTs, but faster.
                    -improved method w/ 2 bigger LUTs to use LUTs of float2
                    -improved method using slow sin/cos functions (now uses sincos combined function), still slow
                    - preparaed plan struct to have method switchable at plan creation time.
      
                    TODO: load smaller LUT for Taylor series approx into shared mem.
      20314512
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