[P4-discuss] Question regarding semantics of actions in P4-14 (v1.0.3)

Andy Fingerhut andy.fingerhut at gmail.com
Thu Jan 19 15:57:43 EST 2017


On Thu, Jan 19, 2017 at 12:49 PM, Andy Fingerhut <andy.fingerhut at gmail.com>
wrote:

> I have heard that the parallel semantics were included in P4_14 in an
> effort to make it easier to compile programs to a target similar to the RMT
> (Reconfigurable Match-action Table ?) architecture, by making it impossible
> to specify dependent arithmetic operations (dependent operations, if there
> is too long a chain, can't be calculated within a single clock cycle at
> high clock rates).  However, I don't think it is straightforward for a
> P4_16 compiler to determine the longest dependent chain in an action with
> sequential semantics.
>

Ugh.  I meant to say: "I _do_ think it is straightforward for a P4_16
compiler to determine the longest dependent chain in an action with
sequential semantics."

Andy
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