[Libre-soc-dev] [RFC] REMAP, SHAPE, complex (full) FFT

Luke Kenneth Casson Leighton lkcl at lkcl.net
Mon Jul 12 21:11:09 BST 2021


HA success, that's a full complex number RADIX2 in-place FFT, it uses
"Vertical-First" mode, and regs 24 thru 27 for temporary scalars in
the middle of each loop.

now comes the analysis part, for ways to optimise this.

i have a feeling it's time to extend SVSTATE to 64 bit and to start
storing "Vertical-First" mode bit, and some hints and other
persistence state, in it.


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