[Libre-soc-isa] [Bug 937] instructions for bigint shift and prefix-code encode

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=937

--- Comment #8 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #7)

> def dshl(a, b, n):
>     mask = (1 << (64 - n % 64)) - 1
>     v = (a & mask) | (b & ~mask)
>     return rotl64(v, n)

https://git.libre-soc.org/?p=openpower-isa.git;a=commitdiff;h=0a43abe68960962f419b68d0357ad4b4274a9b74

muxes for selecting sources is next

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