[Libre-soc-bugs] [Bug 555] encode a dotproduct in a single instruction

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=555

--- Comment #6 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
reminder of what dotproduct is:

    result = 0
    for i in range(x):
        result += a[i] * b[i]

which makes sense for fma as long as RC starts out as zero.

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