func math/bits.OnesCount64

5 uses

	math/bits (current package)
		bits.go#L115: 	return OnesCount64(uint64(x))
		bits.go#L134: func OnesCount64(x uint64) int {

	google.golang.org/protobuf/internal/impl
		decode.go#L186: 	if mi.numRequiredFields > 0 && bits.OnesCount64(requiredMask) != int(mi.numRequiredFields) {
		validate.go#L566: 		if numRequiredFields > 0 && bits.OnesCount64(st.requiredMask) != numRequiredFields {

	google.golang.org/protobuf/internal/set
		ints.go#L14: 	return bits.OnesCount64(uint64(*bs))

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