[Libre-soc-bugs] [Bug 672] create SVP64 demo / unit test "positional popcount"

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=672

--- Comment #12 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
commit d66dc44e23da264fd43d4e7c5749af0890327cf2 (HEAD -> 672_pospopcount)
Author: Luke Kenneth Casson Leighton <lkcl at lkcl.net>
Date:   Tue Nov 28 21:03:43 2023 +0000

    bug #672: fixing pospopcount assembler

    there is a lot going on here, this is pushing the boundaries of
    what ISAcaller can do (or hasnt been asked to do... until now)
    * gbbd (gather bits and bytes double) had to be added
    * sw=8,dw=64 had to be fixed (XLEN is actually 64 there
      but source elements have to be ZERO-EXTENDED...)
    * a bug in sv.addi/sw=8 was found
      https://bugs.libre-soc.org/show_bug.cgi?id=1221
    * some changes to setvl have to be made/written (!)
    * sv.bc in CTR-reduction mode needs to potentially be fixed
      or at least properly examined

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