[Libre-soc-dev] [SVP64] feedback needed - Pack/Unpack (vpack/vunpack)

lkcl luke.leighton at gmail.com
Sat Aug 13 04:33:24 BST 2022



predicate mask (3 bits) not.elwidth (2 bits).

currently fmv (etc) are RM-2P-1S1D with EXTRA3.
3bit extra3 src
3bit extra3 dat
3bit dest predicate

all 9 bits of EXTRA taken up.

no room to do trick of using 1 bit to reinterpret elwidth bits
as P/U.

annoyingly.  it would work well.

sacrificing twin predication not really an option.  also too close
to RFC submission to do major redesigns esp. with resource
commitment on spec, sim, HDL, tests, binutils.


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