[Libre-soc-isa] [Bug 1057] split out all int/fp min/max ops into their own RFC ls013

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1057

--- Comment #13 from Jacob Lifshay <programmerjake at gmail.com> ---
vector minuw is useful as a replacement for the sequence:
u64x4 -> u32x4 -> minu -> u64x4
or other min-at-half-width ops.
note we need half-width compare anyway for vector cmp[l]w, so having
min[u]w/max[u]w mostly just means adding an output mux assuming compare is in
the same ALU as 2-in 1-out gpr ops.

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