[Libre-soc-bugs] [Bug 454] New: Create "subset instruction decoders" that are *inside* mul0, *inside* alu0 and so on

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=454

            Bug ID: 454
           Summary: Create "subset instruction decoders" that are *inside*
                    mul0, *inside* alu0 and so on
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: CONFIRMED
          Severity: normal
          Priority: Normal
         Component: Source Code
          Assignee: lkcl at lkcl.net
          Reporter: colepoirier at gmail.com
                CC: libre-soc-bugs at lists.libre-soc.org
            Blocks: 383
   NLnet milestone: NLNet.2019.Coriolis2

from https://bugs.libre-soc.org/show_bug.cgi?id=199#c58

```the number of oper_* pins is far too large.  this is the "expansion" of the
instruction for convenience.  an example is the 64 bit immediate.

basically i am going to have to do "subset instruction decoders" that are
*inside* mul0, *inside* alu0 and so on.

i have to find time to do that.

until then i think we stop with the floorplan version and go with "flat".
```

Luke, can you edit this tomorrow - since I know you're resting today recovering
from yesterdays driving ordeals - to include more details about what needs to
be done?

Also, I think I have categorized it under the correct milestone and that it
blocks bug #383 'Complete first functional power9 core' but I also think I may
be mistaken so please correct me :)


Referenced Bugs:

https://bugs.libre-soc.org/show_bug.cgi?id=383
[Bug 383] Complete first functional POWER9 Core
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