}

	return r
}

//go:linkname runtime_rand runtime.rand
func runtime_rand() uint64

// runtimeSource is an implementation of Source64 that uses the runtime
// fastrand functions.
type runtimeSource struct {
	// The mutex is used to avoid race conditions in Read.
	mu sync.Mutex
}

func (*runtimeSource) Int63() int64 {
	return int64(runtime_rand() & rngMask)
}

// convenience functions.
var globalRand = &Rand{src: runtimeSource{}}

//go:linkname runtime_rand runtime.rand
func runtime_rand() uint64

// runtimeSource is a Source that uses the runtime fastrand functions.
type runtimeSource struct{}

func (runtimeSource) Uint64() uint64 {
	return runtime_rand()
}

// Int64 returns a non-negative pseudo-random 63-bit integer as an int64