Enum x86_64_xsave::RoundingControl

#[repr(u8)]
pub enum RoundingControl {
    RoundToNearest,
    RoundDownTowardNegativeInfinity,
    RoundUpTowardPositiveInfinity,
    RoundTowardZero,
}

In the Intel 64 and IA-32 architectures, the rounding mode is controlled by a 2-bit rounding-control (RC) field.

Although these two RC fields perform the same function, they control rounding for different execution environments within the processor. The RC field in the x87 FPU control register controls rounding for computations performed with the x87 FPU instructions; the RC field in the MXCSR register controls rounding for SIMD floating-point computations performed with the SSE/SSE2 instructions.

Variants

RoundToNearest

Round to nearest (even).

Rounded result is the closest to the infinitely precise result.

If two values are equally close, the result is the even value (that is, the one with the least-significant bit of zero). Default.

RoundDownTowardNegativeInfinity

Round down (toward −∞).

Rounded result is closest to but no greater than the infinitely precise result.

RoundUpTowardPositiveInfinity

Round up (toward +∞)

Rounded result is closest to but no less than the infinitely precise result.

RoundTowardZero

Round toward zero (Truncate).

Rounded result is closest to but no greater in absolute value than the infinitely precise result.

Trait Implementations

impl PartialOrd<RoundingControl> for RoundingControl

fn partial_cmp(&self, other: &RoundingControl) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]

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

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

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

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for RoundingControl

impl PartialEq<RoundingControl> for RoundingControl

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

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

#[must_use]

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

This method tests for !=.

impl Clone for RoundingControl

fn clone(&self) -> RoundingControl

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Ord for RoundingControl

fn cmp(&self, other: &RoundingControl) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl Eq for RoundingControl

impl Debug for RoundingControl

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

Formats the value using the given formatter.

impl Hash for RoundingControl

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, 

Feeds a slice of this type into the given [Hasher].