pub enum ControlNodeKind {
    Block {
        insts: EntityList<DataInst>,
    },
    Select {
        kind: SelectionKind,
        scrutinee: Value,
        cases: SmallVec<[ControlRegion; 2]>,
    },
    Loop {
        initial_inputs: SmallVec<[Value; 2]>,
        body: ControlRegion,
        repeat_condition: Value,
    },
}

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Block

Fields

Linear chain of DataInsts, executing in sequence.

This is only an optimization over keeping DataInsts in ControlRegion linear chains directly, or even merging DataInst with ControlNode.

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Select

Fields

§scrutinee: Value

Choose one ControlRegion out of cases to execute, based on a single value input (scrutinee) interpreted according to SelectionKind.

This corresponds to “gamma” (γ) nodes in (R)VSDG, though those are sometimes limited only to a two-way selection on a boolean condition.

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Loop

Fields

§initial_inputs: SmallVec<[Value; 2]>
§repeat_condition: Value

Execute body repeatedly, until repeat_condition evaluates to false.

To represent “loop state”, body can take inputs, getting values from:

  • on the first iteration: initial_inputs
  • on later iterations: body’s own outputs (from the last iteration)

As the condition is checked only after the body, this type of loop is sometimes described as “tail-controlled”, and is also equivalent to the C-like do { body; } while(repeat_condition) construct.

This corresponds to “theta” (θ) nodes in (R)VSDG.

Trait Implementations§

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impl Clone for ControlNodeKind

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fn clone(&self) -> ControlNodeKind

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for Twhere T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.