[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 #1 from Jacob Lifshay <programmerjake at gmail.com> ---
proposed:
XLEN=8:
extsb: 1-bit -> 8-bit sign extension
extsh: 2-bit -> 8-bit sign extension
extsw: 4-bit -> 8-bit sign extension
XLEN=16:
extsb: 2-bit -> 16-bit sign extension
extsh: 4-bit -> 16-bit sign extension
extsw: 8-bit -> 16-bit sign extension
XLEN=32:
extsb: 4-bit -> 32-bit sign extension
extsh: 8-bit -> 32-bit sign extension
extsw: 16-bit -> 32-bit sign extension
XLEN=64:
extsb: 8-bit -> 64-bit sign extension
extsh: 16-bit -> 64-bit sign extension
extsw: 32-bit -> 64-bit sign extension

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