Struct rustc_apfloat::ieee::X87DoubleExtendedS

pub struct X87DoubleExtendedS;

Trait Implementations

impl Semantics for X87DoubleExtendedS

const QNAN_SIGNIFICAND: u128 = 13_835_058_055_282_163_712u128

For x87 extended precision, we want to make a NaN, not a pseudo-NaN. Maybe we should expose the ability to make pseudo-NaNs?

fn from_bits(bits: u128) -> IeeeFloat<Self>

Integer bit is explicit in this format. Intel hardware (387 and later) does not support these bit patterns: exponent = all 1’s, integer bit 0, significand 0 (“pseudoinfinity”) exponent = all 1’s, integer bit 0, significand nonzero (“pseudoNaN”) exponent = 0, integer bit 1 (“pseudodenormal”) exponent != 0 nor all 1’s, integer bit 0 (“unnormal”) At the moment, the first two are treated as NaNs, the second two as Normal.

const BITS: usize = 80usize

Total number of bits in the in-memory format.

const PRECISION: usize = 64usize

Number of bits in the significand. This includes the integer bit.

const MAX_EXP: ExpInt = 16_383i16

The largest E such that 2^E is representable; this matches the definition of IEEE 754.

fn to_bits(x: IeeeFloat<Self>) -> u128

const MIN_EXP: ExpInt = _

The smallest E such that 2^E is a normalized number; this matches the definition of IEEE 754.

const QNAN_BIT: usize = _

The significand bit that marks NaN as quiet.

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.

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