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

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri May 22 17:16:20 BST 2020


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

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