[Libre-soc-bugs] [Bug 653] investigate FFT, DCT, etc for REMAP in SVP64

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Wed Jul 28 15:53:19 BST 2021


--- Comment #20 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
notes on progress:

* cos table precalculation schedule added, this is a
  power-2 pascal triangle 4 + 2 + 1 rather than
  4 + 2+2 + 1+1+1+1
* LD-BITREV needed fixing to work with REMAP. it is
  now the *memory offset* (the immediate) that is BOTH
  bitrev'd AND REMAPed where previously it could only
  be the RA register and of course that is a scalar only
  so both brev and REMAP are meaningless for it.

there are a LOT of modes needed here. it may be necessary
to reorganise the bits around for the instructions and submodes

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