[Libre-soc-isa] [Bug 908] indexed remap needs defined behavior for out-of-bounds indexes

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=908

--- Comment #7 from Jacob Lifshay <programmerjake at gmail.com> ---
vsx has precedent for zeroing elements with out-of-bounds indexes: the xxpermx
instruction basically does:
v <- VA || VB
for i in 0 to 15
    if VC.byte[i].bit[0:2] != UIM then
        VT.byte[i] <- 0
    else
        VT.byte[i] <- v.byte[VC.byte[i].bit[3:7]]

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