[libre-riscv-dev] [Bug 338] New: CompUnitALU needs go_die to be wired to ALU shadow mask

[bugzilla-daemon@libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=338

            Bug ID: 338
           Summary: CompUnitALU needs go_die to be wired to ALU shadow
                    mask
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: PC
                OS: Mac OS
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Source Code
          Assignee: lkcl@lkcl.net
          Reporter: lkcl@lkcl.net
                CC: libre-riscv-dev@lists.libre-riscv.org
   NLnet milestone: ---

this is for ALU cancellation.  when go_die is pulled on a Comp Unit, it
indicates
that the result - computed or in transit to *be* computed - is no longer
required
and must be dropped on the floor, immediately.

ALU pipelines are to be set up with "cancellation" capability.  this is set
from nmutil.concurrentunit.ReservationStations "maskwid" parameter, which is
set one per CompUnit.  with the cancellation mask being N bits wide,
N go_die CompUnits may be connected together on the front, one go_die signal
to each cancellation mask bit.

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