[Libre-soc-isa] [Bug 614] Modify SVP64 to support scalar instructions (where VL==0 doesn't convert them to nop)

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Sun Aug 1 19:04:19 BST 2021


Luke Kenneth Casson Leighton <lkcl at lkcl.net> changed:

           What    |Removed                     |Added
                 CC|                            |lkcl at lkcl.net
         Resolution|---                         |INVALID
             Status|CONFIRMED                   |RESOLVED

--- Comment #1 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
conceptually this one is a "no".  anything which relies on checking VL
and changing behaviour is unworkable from a Dependency Hazard perspective,
as well as breaking the rule of abstraction and total independence between
Prefix and Suffix.

i've just experimented with this for FFT and bit-reversed instructions,
breaking this fundamentally critical design rule, and it has been absolute

hard "no".

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