go/src/math/bits.go

const uvnan …

const uvinf …

const uvneginf …

const uvone …

const mask …

const shift …

const bias …

const signMask …

const fracMask …

// Inf returns positive infinity if sign >= 0, negative infinity if sign < 0.
func Inf(sign int) float64 { … }

// NaN returns an IEEE 754 “not-a-number” value.
func NaN() float64 { … }

// IsNaN reports whether f is an IEEE 754 “not-a-number” value.
func IsNaN(f float64) (is bool) { … }

// IsInf reports whether f is an infinity, according to sign.
// If sign > 0, IsInf reports whether f is positive infinity.
// If sign < 0, IsInf reports whether f is negative infinity.
// If sign == 0, IsInf reports whether f is either infinity.
func IsInf(f float64, sign int) bool { … }

// normalize returns a normal number y and exponent exp
// satisfying x == y × 2**exp. It assumes x is finite and non-zero.
func normalize(x float64) (y float64, exp int) { … }