[libre-riscv-dev] [Bug 324] create POWER9 DIV pipeline

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Wed Jun 10 12:00:59 BST 2020


--- Comment #9 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #8)
> Created the setup stage that translates from the input data to the format
> expected by DivPipeCore but didn't create tests yet, am going to be done for
> today. Still have to double check that I got the number of fractional bits
> correct.

fantastic.  as you can probably see i'm slowly going through the
test_pipe_caller.py code removing code-duplication.  for now i recommend
cookie-cutting fu/alu/test_pipe_caller.py in its entirety, because i
noticed that these use OE/Rc.  

* divdu RT,RA,RB (OE=0 Rc=0)

Special Registers Altered:

    CR0                     (if Rc=1)
    SO OV OV32             (if OE=1)

that means they're exactly like fixedarith, for *both* input and output
data, so you can straight-cookie-cut alu test_pipe_caller.py

i will drop in an fu/compunits/test/test_div_compunit.py

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