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

Luke Kenneth Casson Leighton lkcl at lkcl.net
Mon Jul 12 15:35:19 BST 2021


excellent.  slowly, step by step.  that unit test is still DFT (one multiply,
one in-place add-sub) however it's in Vertical-First mode and it's
using a scalar register (fp24) as an *explicit intermediary* rather than
relying on a single MUL-ADD instruction.

with that worked out, the next step is the full complex-number version,
using the (much simpler) DFT version as a template.


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