[Libre-soc-isa] [Bug 1183] New: add /mrr mode (reverse mode) to Data-Dependent Fail-First CR_ops

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1183

            Bug ID: 1183
           Summary: add /mrr mode (reverse mode) to Data-Dependent
                    Fail-First CR_ops
           Product: Libre-SOC's first SoC
           Version: unspecified
          Hardware: PC
                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: ---

it was discovered when implementing pow(x,y,mod) in the cryptoprimitives
grant that "reverse data-dependent fail-first" is needed. this bugreport
needs to implement that, but there is only room to do so for the 5-bit
mode of CR_ops. fortunately this covers sv.cmpi which is a critically
important use-case.

---

https://bugs.libre-soc.org/show_bug.cgi?id=1044#c56

* TODO spec
* TODO powerdecoder (prefix mostly)
* TODO insndb
* TODO ISACaller unit tests
* TODO binutils
* TODO binutils unit tests

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