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

[bugzilla-daemon at libre-soc.org]

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

--- Comment #12 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
ascii art's great, sphinx plugin can turn it into an image.
  irony: you can have too many comments, they become
a distraction esp. when the function is 2 lines and comments 10-12

spelling: "it's" is not a relative pronoun. it's short for the two words, "it"
and "is".  also "cuz" is fine in IRC but not documentation.

inter function can go (1 liner made from these)
https://stackoverflow.com/questions/339007/how-to-pad-zeroes-to-a-string
https://stackoverflow.com/questions/16060899/alphabet-range-in-python

string.ascii_lowercase[:-length].rjust(fixedlen, "0")

negative ranges start from the opposite end.  works with
start as well e.g. list[-5:7]

"""docstrings convention
end closer on a newline, lined up
"""

also can you put the rtlil creator back in, they are really useful

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