[Libre-soc-bugs] [Bug 340] formal proof of POWER9 SHIFTROT pipeline needed

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Sun Jul 26 22:56:56 BST 2020


--- Comment #2 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
samuel the code is fine as there are a number of unit tests that already pass. 
we just need the mask/clear proofs added.  i had made a start on it already
however the different options was doing my head in.

here we definitely, definitely need to stick with the field decoders.  there
are odd things in the pseudocode that swap the MSB to the LSB.


    b <- mb[5] || mb[0:4]

however please especially note: the 3.0B spec pseudocode is **WRONG** for the
field named "sh".  it is the shift amount AS-IS, it must NOT be Cat(sh[5],
sh[0:5]) or somesuch.

i have raised this as a bugreport on openpowerhdl-cores.


so, again: shl, extswsli, these are all done.  it is just the "mask" versions
rl* that need doing.

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