1 files changed, 33 insertions, 0 deletions
diff --git a/pkg/bits/bits64.go b/pkg/bits/bits64.go
new file mode 100644
index 000000000..73117b19b
--- /dev/null
+++ b/pkg/bits/bits64.go
@@ -0,0 +1,33 @@
+package bits
+
+// IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
+func IsOn64(mask, bits uint64) bool {
+	return mask&bits == bits
+}
+
+// IsAnyOn returns true if *any* bit set in 'bits' is set in 'mask'.
+func IsAnyOn64(mask, bits uint64) bool {
+	return mask&bits != 0
+}
+
+// Mask returns a T with all of the given bits set.
+func Mask64(is ...int) uint64 {
+	ret := uint64(0)
+	for _, i := range is {
+		ret |= MaskOf64(i)
+	}
+	return ret
+}
+
+// MaskOf is like Mask, but sets only a single bit (more efficiently).
+func MaskOf64(i int) uint64 {
+	return uint64(1) << uint64(i)
+}
+
+// IsPowerOfTwo returns true if v is power of 2.
+func IsPowerOfTwo64(v uint64) bool {
+	if v == 0 {
+		return false
+	}
+	return v&(v-1) == 0
+}