Enum ExceptionHandlingMode

#[repr(u8)]
pub enum ExceptionHandlingMode {
    IgnoreExactUnderflow = 0,
    SignalExactUnderflow = 1,
}

Select if the underflow exception should be signaled when the result is exact.

In IEEE 754, when exceptions are set to use the default handlers (they are ignored – the default for most programming languages), then underflow exceptions are only signalled when the result is not exact.

When exceptions are instead set to trap, then underflow exceptions are signalled even when the result is exact, to allow the exception handler to emulate flush-to-zero FP semantics.

Since simple-soft-float doesn’t support trapping exceptions, to simulate trapping exceptions, use SignalExactUnderflow as the exception handling mode and check status_flags after every operation.

Otherwise, use the default value of IgnoreExactUnderflow.

Variants

IgnoreExactUnderflow = 0

Use the default behavior of ignoring exact underflow.

SignalExactUnderflow = 1

Signal the UNDERFLOW exception even if the results are exact.

Trait Implementations

impl Clone for ExceptionHandlingMode

fn clone(&self) -> ExceptionHandlingMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ExceptionHandlingMode

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

Formats the value using the given formatter.

impl Default for ExceptionHandlingMode

fn default() -> ExceptionHandlingMode

Returns the “default value” for a type.

impl Hash for ExceptionHandlingMode

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 ExceptionHandlingMode

fn eq(&self, other: &ExceptionHandlingMode) -> 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 ExceptionHandlingMode

impl Eq for ExceptionHandlingMode

impl StructuralPartialEq for ExceptionHandlingMode