[Libre-soc-isa] [Bug 966] create shift-and-add instruction

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=966

--- Comment #8 from Jacob Lifshay <programmerjake at gmail.com> ---
In the meeting today I pointed out that we probably also want shaddsw since C
likes to use int for array indexing.

shaddsw:
RT = RA + ((uint64_t)(int32_t)RB << (sh + 1))

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