[Libre-soc-isa] [Bug 1061] change extsb/h/w definitions to scale input size with XLEN rather than convert from fixed sizes

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1061

--- Comment #7 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #6)
> lkcl: note that imho you waay overcomplicated the extsb pseudocode, i think
> it should just be: RT <- EXTSXL((RA), XLEN/8)

had to be illustrated clearly and explicityly. 
EXTSXL is not clear nor in Power ISA v3.1 spec.

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