func math.Signbit

8 uses

	math (current package)
		atan2.go#L43: 		if x >= 0 && !Signbit(x) {
		dim.go#L55: 		if Signbit(x) {
		dim.go#L91: 		if Signbit(x) {
		gamma.go#L140: 		if Signbit(x) {
		pow.go#L66: 			if Signbit(x) && isOddInt(y) {
		pow.go#L71: 			if Signbit(x) && isOddInt(y) {
		signbit.go#L8: func Signbit(x float64) bool {

	math/big
		float.go#L560: 	z.neg = math.Signbit(x) // handle -0, -Inf correctly

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