func runtime/internal/sys.Len64

3 uses

	runtime/internal/sys (current package)
		intrinsics.go#L99: func Len64(x uint64) (n int) {
		intrinsics.go#L153: func LeadingZeros64(x uint64) int { return 64 - Len64(x) }

	runtime
		histogram.go#L119: 	if l := sys.Len64(uint64(duration)); l < timeHistMinBucketBits {

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