Struct Log2Floor

pub struct Log2Floor;

The base 2 logarithm of the input, rounded down. See also: u64::ilog2.

Behavior

BEFORE: _ [x: u64]
AFTER:  _ [y: u32]

Preconditions

• the input x is properly BFieldCodec encoded
• the input x is not 0

Postconditions

• y is the base-2 integer logarithm of x
• y is properly BFieldCodec encoded

Trait Implementations

impl BasicSnippet for Log2Floor

fn inputs(&self) -> Vec<(DataType, String)>

fn outputs(&self) -> Vec<(DataType, String)>

fn entrypoint(&self) -> String

fn code(&self, _: &mut Library) -> Vec<LabelledInstruction>

fn sign_offs(&self) -> HashMap<Reviewer, SignOffFingerprint>

Contains an entry for every sign off.

fn annotated_code(&self, library: &mut Library) -> Vec<LabelledInstruction>

fn link_for_isolated_run(&self) -> Vec<LabelledInstruction>

fn init_stack_for_isolated_run(&self) -> Vec<BFieldElement>

Initial stack on program start, when the snippet runs in isolation.

fn stack_diff(&self) -> isize

impl Clone for Log2Floor

fn clone(&self) -> Log2Floor

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Log2Floor

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

Formats the value using the given formatter.

impl Hash for Log2Floor

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 PartialEq for Log2Floor

fn eq(&self, other: &Log2Floor) -> bool

Tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for Log2Floor

impl Eq for Log2Floor

impl StructuralPartialEq for Log2Floor