blob: 28134a9e76d7ef634c4147d31c3bce863da66e84 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
package bits
// IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
func IsOn32(mask, bits uint32) bool {
return mask&bits == bits
}
// IsAnyOn returns true if *any* bit set in 'bits' is set in 'mask'.
func IsAnyOn32(mask, bits uint32) bool {
return mask&bits != 0
}
// Mask returns a T with all of the given bits set.
func Mask32(is ...int) uint32 {
ret := uint32(0)
for _, i := range is {
ret |= MaskOf32(i)
}
return ret
}
// MaskOf is like Mask, but sets only a single bit (more efficiently).
func MaskOf32(i int) uint32 {
return uint32(1) << uint32(i)
}
// IsPowerOfTwo returns true if v is power of 2.
func IsPowerOfTwo32(v uint32) bool {
if v == 0 {
return false
}
return v&(v-1) == 0
}
|
