Method Normalize

fflib/v1/extfloat.go:199–231

Normalize normalizes f so that the highest bit of the mantissa is set, and returns the number by which the mantissa was left-shifted.

()

// Normalize normalizes f so that the highest bit of the mantissa is
// set, and returns the number by which the mantissa was left-shifted.
func (f *extFloat) Normalize() (shift uint) {
	mant, exp := f.mant, f.exp
	if mant == 0 {
		return 0
	}
	if mant>>(64-32) == 0 {
		mant <<= 32
		exp -= 32
	}
	if mant>>(64-16) == 0 {
		mant <<= 16
		exp -= 16
	}
	if mant>>(64-8) == 0 {
		mant <<= 8
		exp -= 8
	}
	if mant>>(64-4) == 0 {
		mant <<= 4
		exp -= 4
	}
	if mant>>(64-2) == 0 {
		mant <<= 2
		exp -= 2
	}
	if mant>>(64-1) == 0 {
		mant <<= 1
		exp -= 1
	}
	shift = uint(f.exp - exp)
	f.mant, f.exp = mant, exp
	return
}

// Multiply sets f to the product f*g: the result is correctly rounded,
// but not normalized.