[Libre-soc-isa] [Bug 1243] 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

--- Comment #3 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Jacob Lifshay from comment #1)
> and x86-64 OoO cpus often have a microarchitectural zero register.

more stuff about zero registers: https://yarchive.net/comp/zero_register.html

as you know, ppc sorta has a zero register in that many instructions use zero
instead of loading from a GPR when given register number 0.

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