Enum BranchPredictionError 

pub enum BranchPredictionError {
    ReturnAddressStackZeroEntries,
    BranchTargetBufferZeroEntries,
    TaggedGeometricHistoryLowTooSmall,
    TaggedGeometricHistoryFactorTooSmall,
    TaggedGeometricHistoryTooLong,
    TaggedGeometricHistoryHighLowerThanLow,
    TaggedGeometricTableZeroEntries(usize),
    TaggedGeometricTableTooSmallTag(usize),
    TaggedGeometricTableTooLargeTag(usize),
}

Represents an error inside the configuration of a branch predictor.

Variants

ReturnAddressStackZeroEntries

The return address doesn’t have any entries and thus doesn’t function.

BranchTargetBufferZeroEntries

The branch target buffer doesn’t hold any entries and thus doesn’t function.

TaggedGeometricHistoryLowTooSmall

A history length below 2 would mean no history tracking, defeating the purpose.

TaggedGeometricHistoryFactorTooSmall

The history size must increase from one table to the next for the predictor to function. The calculated factor is too small to achieve that.

TaggedGeometricHistoryTooLong

The global history grows to excessive values.

TaggedGeometricHistoryHighLowerThanLow

The history length of the table with the longest one is smaller than the history length of the table with the smallest one.

TaggedGeometricTableZeroEntries(usize)

The prediction table contains no value, making it useless. Contains index of the offending table.

TaggedGeometricTableTooSmallTag(usize)

The tag of entries inside the table is too small to be useful. Contains index of the offending table.

TaggedGeometricTableTooLargeTag(usize)

The tag of entries inside the table is too big. It’s an arbitrary limit to achieve fast simulation.

Trait Implementations

impl Debug for BranchPredictionError

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

Formats the value using the given formatter.

impl Display for BranchPredictionError

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

Formats the value using the given formatter.

impl Error for BranchPredictionError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.