Function EncodeFloatAscending

pkg/util/encoding/float.go:36–54

EncodeFloatAscending returns the resulting byte slice with the encoded float64 appended to b. The encoded format for a float64 value f is, for positive f, the encoding of the 64 bits (in IEEE 754 format) re-interpreted as an int64 and encoded using EncodeUint64Ascending. For negative f, we keep the

(b []byte, f float64)

// This ordering ensures that NaNs are always sorted first in either encoding
// direction, and that after them a logical ordering is followed.
func EncodeFloatAscending(b []byte, f float64) []byte {
	// Handle the simplistic cases first.
	switch {
	case math.IsNaN(f):
		return append(b, floatNaN)
	case f == 0:
		// This encodes both positive and negative zero the same. Negative zero uses
		// composite indexes to decode itself correctly.
		return append(b, floatZero)
	}
	u := math.Float64bits(f)
	if u&(1<<63) != 0 {
		u = ^u
		b = append(b, floatNeg)
	} else {
		b = append(b, floatPos)
	}
	return EncodeUint64Ascending(b, u)
}

// EncodeFloatDescending is the descending version of EncodeFloatAscending.
func EncodeFloatDescending(b []byte, f float64) []byte {