[Libre-soc-bugs] [Bug 324] create POWER9 DIV pipeline

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri Jun 19 15:15:45 BST 2020


--- Comment #17 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Luke Kenneth Casson Leighton from comment #16)
> (In reply to Jacob Lifshay from comment #13)
> > All divisions are truncating division, not floor division, so we should
> > translate them to function calls to custom trunc_div and trunc_rem functions
> > rather than python's // and % operators (since the mod* instructions
> > implement the mathematical remainder of truncating division operation rather
> > than the mathematical modulo operation).
> urk. yuk.  that's going to be a bad hack (based on the name of the variables
> involved - what is being assigned to).  it's doable - just not pretty.


[master 428ee14] add in really bad hack which calls trunc_div or trunc_mod

i have one more thing left to do (one more bad hack) - identify where
"undefined" is used and copy only the bits required from it.

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