[Libre-soc-isa] [Bug 1243] New: when loading index registers, have defined behavior for out of range indexes

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1243

            Bug ID: 1243
           Summary: when loading index registers, have defined behavior
                    for out of range indexes
           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: programmerjake at gmail.com
                CC: libre-soc-isa at lists.libre-soc.org
   NLnet milestone: ---

(In reply to Jacob Lifshay from bug #1242 comment #3)
> (In reply to Jacob Lifshay from bug #1242 comment #1)
> > if there's separate registers, i think it makes it easier to handle
> > out-of-range indexes because svindex can simply do
> > 
> > for i in range(VL):
> >     v = READ_INPUT(i)
> >     index[i] = 0 if v >= VL else v
> 
> to be clear, this means that out of range indexes cause you to access
> element 0 instead.
> e.g. if the input indexes are [1, 2345, 0, 2]
> and you run:
> sv.index *input
> # svremap something set *in2 to be remapped
> sv.mv *out, *in2
> 
> then out = [in2[1], in2[0], in2[0], in2[2]]

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