INNER CODE UNIT · Go

xform

ericlagergren/decimal · big.go:679

	xform := x.form // in case z == x
	z.copyAbs(x)
	z.form = xform ^ signbit
	return z
}

// CopySign sets z to x with the sign of y and returns z.
//
// It accepts NaN values.
func (z *Big) CopySign(x, y *Big) *Big {
	if debug {
		x.validate()
		y.validate()
	}
	// Pre-emptively capture signbit in case z == y.
	sign := y.form & signbit
	z.copyAbs(x)
	z.form |= sign

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