[Libre-soc-isa] [Bug 1071] maybe add parallel prefix sum remap mode

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=1071

--- Comment #4 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
https://libre-soc.org/openpower/sv/remap/

3.1 Parallel Reduction Mode

Creates the Schedules for Parallel Tree Reduction.

    submode=0b00 selects the left operand index
    submode=0b01 selects the right operand index

it's *just* about possible to squeeze in alternative modes
without going overboard - svshape's 3rd dimension (zdim)
could in theory be used to indicate an alternative reduction
algorithm.

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