- 25 Jun, 2012 1 commit
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Heinz-Bernd Eggenstein authored
experimanetal: improved Taylor series approx by copying LUT to shared mem. TODO: cleanup, expose sin/cos method on plan creation interface, do proper calculation of available shared mem for sin cos LUT
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- 22 Jun, 2012 1 commit
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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.
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- 08 Jun, 2012 1 commit
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Heinz-Bernd Eggenstein authored
Still experimental: replace calls to native_sin in clFFT This change explores the performance impacts of using a set of LUTs, precomputed on the CPU to perform sin(x_i) and cos(x_i) in a grid x_i= +/- 2*pi *i/N , N fixed. On a 6770M, this code is still ca 3% slower than the original native_sin/native_cos varaint for a BRP4-like transform This variant should have a very high accuracy, versions with lesser accuracy but higher performance should be explored next. Eventually the method should be selectable by a parameter to the plan creator as suggested by Bernd. TODO: - remove some diagnostic code, - optimze total size of LUTs perhaps by using cos(x) = sin(x+pi/2), so no need to keep separate LUTs for sin and cos, just one slighly longer with an additional alias pointer - try caching the LUTs in shared memory (using constant memory didn't help)
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- 18 Mar, 2011 2 commits
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Oliver Bock authored
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Oliver Bock authored
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- 16 Mar, 2011 2 commits
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Oliver Bock authored
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Oliver Bock authored
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- 12 Jan, 2011 3 commits
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Oliver Bock authored
* Added dedicated Makefiles * Added support for Mac OS 10.6 * TODO: proper Linux and Windows support * Note: we need to add licensing headers!
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Oliver Bock authored
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Gaurav Khanna authored
* Based on Apple's OpenCL FFT implementation * Derivative work done by Gaurav Khanna
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