[Libre-soc-bugs] [Bug 755] add grev instruction (OP_GREV)

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri May 20 23:54:44 BST 2022


https://bugs.libre-soc.org/show_bug.cgi?id=755

--- Comment #60 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
the "identity" pattern which makes A (left side) go straight through
is 0b1010, and B side is 0b1100. i think.  which would be an 8bit
of 0b11001010 or 0xca.

honestly it would be easier (a lot easier) to arrange the inputs to
the LUT pairs if that was 0xaa! "identity" (no change at all) would
just be 0xaaaaaaaaaaaaaaa (6x 8-bit 0xaa)

which can be arranged by swapping a and b on the right side.  all needs
checking.

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