go/src/math/logb.go

// Logb returns the binary exponent of x.
//
// Special cases are:
//
//	Logb(±Inf) = +Inf
//	Logb(0) = -Inf
//	Logb(NaN) = NaN
func Logb(x float64) float64 { … }

// Ilogb returns the binary exponent of x as an integer.
//
// Special cases are:
//
//	Ilogb(±Inf) = MaxInt32
//	Ilogb(0) = MinInt32
//	Ilogb(NaN) = MaxInt32
func Ilogb(x float64) int { … }

// ilogb returns the binary exponent of x. It assumes x is finite and
// non-zero.
func ilogb(x float64) int { … }