[Libre-soc-isa] [Bug 940] New: SVP64 LD/ST auto-increment mode (working with LDST-update)

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Mon Oct 3 17:16:20 BST 2022


            Bug ID: 940
           Summary: SVP64 LD/ST auto-increment mode (working with
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: Other
                OS: Linux
            Status: CONFIRMED
          Severity: enhancement
          Priority: ---
         Component: Specification
          Assignee: lkcl at lkcl.net
          Reporter: lkcl at lkcl.net
                CC: libre-soc-isa at lists.libre-soc.org
   NLnet milestone: ---

the 68000 PDP8 PDP11 and 6600 all had auto-increment addressing modes.
Power ISA has LDST-with-update which is not quite the same but almost:
update-with-immediate on a Vector advances by the immediate, but has
an initial "one too many adds"

autoincrementing should use the EA *before* the add is performed
(i.e. just RA) as an option.  thus on loop exit RA is set to
point to where the *next* batch starts.

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