Enum rustc_middle::mir::syntax::NonDivergingIntrinsic

pub enum NonDivergingIntrinsic<'tcx> {
    Assume(Operand<'tcx>),
    CopyNonOverlapping(CopyNonOverlapping<'tcx>),
}

Variants

Assume(Operand<'tcx>)

Denotes a call to the intrinsic function assume.

The operand must be a boolean. Optimizers may use the value of the boolean to backtrack its computation to infer information about other variables. So if the boolean came from a x < y operation, subsequent operations on x and y could elide various bound checks. If the argument is false, this operation is equivalent to TerminatorKind::Unreachable.

CopyNonOverlapping(CopyNonOverlapping<'tcx>)

Denotes a call to the intrinsic function copy_nonoverlapping.

First, all three operands are evaluated. src and dest must each be a reference, pointer, or Box pointing to the same type T. count must evaluate to a usize. Then, src and dest are dereferenced, and count * size_of::<T>() bytes beginning with the first byte of the src place are copied to the contiguous range of bytes beginning with the first byte of dest.

Needs clarification: In what order are operands computed and dereferenced? It should probably match the order for assignment, but that is also undecided.

Needs clarification: Is this typed or not, ie is there a typed load and store involved? I vaguely remember Ralf saying somewhere that he thought it should not be.

Trait Implementations

impl<'tcx> Clone for NonDivergingIntrinsic<'tcx>

fn clone(&self) -> NonDivergingIntrinsic<'tcx>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx> Debug for NonDivergingIntrinsic<'tcx>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'tcx, __D: TyDecoder<I = TyCtxt<'tcx>>> Decodable<__D> for NonDivergingIntrinsic<'tcx>

fn decode(__decoder: &mut __D) -> Self

impl Display for NonDivergingIntrinsic<'_>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'tcx, __E: TyEncoder<I = TyCtxt<'tcx>>> Encodable<__E> for NonDivergingIntrinsic<'tcx>

fn encode(&self, __encoder: &mut __E)

impl<'tcx> Hash for NonDivergingIntrinsic<'tcx>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where
    H: Hasher,
    Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'tcx, '__ctx> HashStable<StableHashingContext<'__ctx>> for NonDivergingIntrinsic<'tcx>

fn hash_stable(
    &self,
    __hcx: &mut StableHashingContext<'__ctx>,
    __hasher: &mut StableHasher
)

impl<'tcx> PartialEq<NonDivergingIntrinsic<'tcx>> for NonDivergingIntrinsic<'tcx>

fn eq(&self, other: &NonDivergingIntrinsic<'tcx>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'tcx> TypeFoldable<'tcx> for NonDivergingIntrinsic<'tcx>

fn try_fold_with<__F: FallibleTypeFolder<'tcx>>(
    self,
    __folder: &mut __F
) -> Result<Self, __F::Error>

The entry point for folding. To fold a value t with a folder f call: t.try_fold_with(f).

fn fold_with<F: TypeFolder<'tcx>>(self, folder: &mut F) -> Self

A convenient alternative to try_fold_with for use with infallible folders. Do not override this method, to ensure coherence with try_fold_with.

impl<'tcx> TypeVisitable<'tcx> for NonDivergingIntrinsic<'tcx>

fn visit_with<__V: TypeVisitor<'tcx>>(
    &self,
    __visitor: &mut __V
) -> ControlFlow<__V::BreakTy>

The entry point for visiting. To visit a value t with a visitor v call: t.visit_with(v).

fn has_vars_bound_at_or_above(&self, binder: DebruijnIndex) -> bool

Returns true if self has any late-bound regions that are either bound by binder or bound by some binder outside of binder. If binder is ty::INNERMOST, this indicates whether there are any late-bound regions that appear free.

fn has_vars_bound_above(&self, binder: DebruijnIndex) -> bool

Returns true if this type has any regions that escape binder (and hence are not bound by it).

fn has_escaping_bound_vars(&self) -> bool

Return true if this type has regions that are not a part of the type. For example, for<'a> fn(&'a i32) return false, while fn(&'a i32) would return true. The latter can occur when traversing through the former.

fn has_type_flags(&self, flags: TypeFlags) -> bool

fn has_projections(&self) -> bool

fn has_opaque_types(&self) -> bool

fn references_error(&self) -> bool

fn error_reported(&self) -> Result<(), ErrorGuaranteed>

fn has_non_region_param(&self) -> bool

fn has_infer_regions(&self) -> bool

fn has_infer_types(&self) -> bool

fn has_non_region_infer(&self) -> bool

fn needs_infer(&self) -> bool

fn has_placeholders(&self) -> bool

fn needs_subst(&self) -> bool

fn has_free_regions(&self) -> bool

“Free” regions in this context means that it has any region that is not (a) erased or (b) late-bound.

fn has_erased_regions(&self) -> bool

fn has_erasable_regions(&self) -> bool

True if there are any un-erased free regions.

fn is_global(&self) -> bool

Indicates whether this value references only ‘global’ generic parameters that are the same regardless of what fn we are in. This is used for caching.

fn has_late_bound_regions(&self) -> bool

True if there are any late-bound regions

fn still_further_specializable(&self) -> bool

Indicates whether this value still has parameters/placeholders/inference variables which could be replaced later, in a way that would change the results of impl specialization.

impl<'tcx> StructuralPartialEq for NonDivergingIntrinsic<'tcx>

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 72 bytes

Size for each variant:

• Assume: 32 bytes
• CopyNonOverlapping: 72 bytes