[Libre-soc-isa] [Bug 1242] New: SV REMAP: store REMAP indices in 16 64-bit SPRs

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1242

            Bug ID: 1242
           Summary: SV REMAP: store REMAP indices in 16 64-bit SPRs
           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: ---

there is a problem with using GPRs for indices
in svindex, but also a lack of flexibility in
the REMAP shortcut instructions.

this is solved by having a separate regfile for
REMAP Indices (all of them) where svshape2/3/4
svoffset and svindex all rewrite them, but they
can be overwritten simply by using mtspr (or sv.mtspr)

this solves a major problem of GPR Hazards.

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