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Clarifications on range operators #1127

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Aug 8, 2022
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Clarifications on range operators #1127

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Clarifications on range operators
Aug 5, 2022
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Merge branch 'main' into issue1104
jnfoster Aug 8, 2022
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12 changes: 9 additions & 3 deletions p4-16/spec/P4-16-spec.mdk
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Expand Up @@ -4129,16 +4129,20 @@ values.
### Ranges { #sec-ranges }

The infix operator `..` takes two arguments of the same type `T`,
where `T` is either `bit<W>` or `int<W>`, and creates a value of
type `set<T>`. The set contains all values numerically between the
first and the second, inclusively. For example:
where `T` is either `bit<W>`, `int<W>`, or a serializable enum value,
and creates a value of type `set<T>`. The set contains all values
numerically between the first and the second, inclusively. For
example:

~ Begin P4Example
4w5 .. 4w8
~ End P4Example

denotes a set with values `4w5, 4w6, 4w7`, and `4w8`.

A range where the second value is smaller than the first one
represents an empty set.

### Products { #sec-tuples-of-sets }

Multiple sets can be combined using Cartesian product:
Expand Down Expand Up @@ -8344,6 +8348,8 @@ The P4 compiler should provide:

## Summary of changes made in version 1.2.4

* Clarified semantics of ranges where the start is bigger than the end (Section [#sec-ranges]).
* Allow ranges to be specified by serializable enums (Section [#sec-ranges]).
* Specified type produced by the `*sizeInB*` methods (Section [#sec-minsizeinbits]).
* Added section with operations on `match_kind` values (Section [#sec-match-kind-exprs]).

Expand Down