[libre-riscv-dev] [Bug 355] New: game theory "state" packet engine needed

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Wed May 27 22:04:35 BST 2020


            Bug ID: 355
           Summary: game theory "state" packet engine needed
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: Other
                OS: Linux
            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: ---

it occurred to me that the branch system etc. is basically running game theory
(in hardware), running new "state" ahead.

the program counter, DEC SPR, and TB SPR, these all increment and need rollback
in a group.  there may also be other pieces of state information involved.

my feeling is that we will need a ring buffer, associated with the instruction
queue (or actually part of it) that contains each advancement of that state,
and thus we can roll it back without losing anything.

perhaps it is as simple as adding DEC and TB to the Decode2ExecuteType data

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