github.com/nicocha30/gvisor-ligolo@v0.0.0-20230726075806-989fa2c0a413/pkg/bits/bits64.go (about)

     1  package bits
     2  
     3  // IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
     4  func IsOn64(mask, bits uint64) bool {
     5  	return mask&bits == bits
     6  }
     7  
     8  // IsAnyOn returns true if *any* bit set in 'bits' is set in 'mask'.
     9  func IsAnyOn64(mask, bits uint64) bool {
    10  	return mask&bits != 0
    11  }
    12  
    13  // Mask returns a T with all of the given bits set.
    14  func Mask64(is ...int) uint64 {
    15  	ret := uint64(0)
    16  	for _, i := range is {
    17  		ret |= MaskOf64(i)
    18  	}
    19  	return ret
    20  }
    21  
    22  // MaskOf is like Mask, but sets only a single bit (more efficiently).
    23  func MaskOf64(i int) uint64 {
    24  	return uint64(1) << uint64(i)
    25  }
    26  
    27  // IsPowerOfTwo returns true if v is power of 2.
    28  func IsPowerOfTwo64(v uint64) bool {
    29  	if v == 0 {
    30  		return false
    31  	}
    32  	return v&(v-1) == 0
    33  }