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Package bits

import "math/bits"
Overview
Index
Examples

Overview ▾

Package bits implements bit counting and manipulation functions for the predeclared unsigned integer types.

Index ▾

Package files

bits.go bits_tables.go

Constants

UintSize is the size of a uint in bits.

const UintSize = uintSize

func LeadingZeros

func LeadingZeros(x uint) int

LeadingZeros returns the number of leading zero bits in x; the result is UintSize for x == 0.

func LeadingZeros16

func LeadingZeros16(x uint16) int

LeadingZeros16 returns the number of leading zero bits in x; the result is 16 for x == 0.

Example

LeadingZeros16(0000000000000001) = 15

func LeadingZeros32

func LeadingZeros32(x uint32) int

LeadingZeros32 returns the number of leading zero bits in x; the result is 32 for x == 0.

Example

LeadingZeros32(00000000000000000000000000000001) = 31

func LeadingZeros64

func LeadingZeros64(x uint64) int

LeadingZeros64 returns the number of leading zero bits in x; the result is 64 for x == 0.

Example

LeadingZeros64(0000000000000000000000000000000000000000000000000000000000000001) = 63

func LeadingZeros8

func LeadingZeros8(x uint8) int

LeadingZeros8 returns the number of leading zero bits in x; the result is 8 for x == 0.

Example

LeadingZeros8(00000001) = 7

func Len

func Len(x uint) int

Len returns the minimum number of bits required to represent x; the result is 0 for x == 0.

func Len16

func Len16(x uint16) (n int)

Len16 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

Example

Len16(0000000000001000) = 4

func Len32

func Len32(x uint32) (n int)

Len32 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

Example

Len32(00000000000000000000000000001000) = 4

func Len64

func Len64(x uint64) (n int)

Len64 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

Example

Len64(0000000000000000000000000000000000000000000000000000000000001000) = 4

func Len8

func Len8(x uint8) int

Len8 returns the minimum number of bits required to represent x; the result is 0 for x == 0.

Example

Len8(00001000) = 4

func OnesCount

func OnesCount(x uint) int

OnesCount returns the number of one bits ("population count") in x.

func OnesCount16

func OnesCount16(x uint16) int

OnesCount16 returns the number of one bits ("population count") in x.

Example

OnesCount16(0000000000001110) = 3

func OnesCount32

func OnesCount32(x uint32) int

OnesCount32 returns the number of one bits ("population count") in x.

Example

OnesCount32(00000000000000000000000000001110) = 3

func OnesCount64

func OnesCount64(x uint64) int

OnesCount64 returns the number of one bits ("population count") in x.

Example

OnesCount64(0000000000000000000000000000000000000000000000000000000000001110) = 3

func OnesCount8

func OnesCount8(x uint8) int

OnesCount8 returns the number of one bits ("population count") in x.

Example

OnesCount8(00001110) = 3

func Reverse

func Reverse(x uint) uint

Reverse returns the value of x with its bits in reversed order.

func Reverse16

func Reverse16(x uint16) uint16

Reverse16 returns the value of x with its bits in reversed order.

Example

0000000000010011
1100100000000000

func Reverse32

func Reverse32(x uint32) uint32

Reverse32 returns the value of x with its bits in reversed order.

Example

00000000000000000000000000010011
11001000000000000000000000000000

func Reverse64

func Reverse64(x uint64) uint64

Reverse64 returns the value of x with its bits in reversed order.

Example

0000000000000000000000000000000000000000000000000000000000010011
1100100000000000000000000000000000000000000000000000000000000000

func Reverse8

func Reverse8(x uint8) uint8

Reverse8 returns the value of x with its bits in reversed order.

Example

00010011
11001000

func ReverseBytes

func ReverseBytes(x uint) uint

ReverseBytes returns the value of x with its bytes in reversed order.

func ReverseBytes16

func ReverseBytes16(x uint16) uint16

ReverseBytes16 returns the value of x with its bytes in reversed order.

Example

0000000000001111
0000111100000000

func ReverseBytes32

func ReverseBytes32(x uint32) uint32

ReverseBytes32 returns the value of x with its bytes in reversed order.

Example

00000000000000000000000000001111
00001111000000000000000000000000

func ReverseBytes64

func ReverseBytes64(x uint64) uint64

ReverseBytes64 returns the value of x with its bytes in reversed order.

Example

0000000000000000000000000000000000000000000000000000000000001111
0000111100000000000000000000000000000000000000000000000000000000

func RotateLeft

func RotateLeft(x uint, k int) uint

RotateLeft returns the value of x rotated left by (k mod UintSize) bits. To rotate x right by k bits, call RotateLeft(x, -k).

func RotateLeft16

func RotateLeft16(x uint16, k int) uint16

RotateLeft16 returns the value of x rotated left by (k mod 16) bits. To rotate x right by k bits, call RotateLeft16(x, -k).

Example

0000000000001111
0000000000111100
1100000000000011

func RotateLeft32

func RotateLeft32(x uint32, k int) uint32

RotateLeft32 returns the value of x rotated left by (k mod 32) bits. To rotate x right by k bits, call RotateLeft32(x, -k).

Example

00000000000000000000000000001111
00000000000000000000000000111100
11000000000000000000000000000011

func RotateLeft64

func RotateLeft64(x uint64, k int) uint64

RotateLeft64 returns the value of x rotated left by (k mod 64) bits. To rotate x right by k bits, call RotateLeft64(x, -k).

Example

0000000000000000000000000000000000000000000000000000000000001111
0000000000000000000000000000000000000000000000000000000000111100
1100000000000000000000000000000000000000000000000000000000000011

func RotateLeft8

func RotateLeft8(x uint8, k int) uint8

RotateLeft8 returns the value of x rotated left by (k mod 8) bits. To rotate x right by k bits, call RotateLeft8(x, -k).

Example

00001111
00111100
11000011

func TrailingZeros

func TrailingZeros(x uint) int

TrailingZeros returns the number of trailing zero bits in x; the result is UintSize for x == 0.

func TrailingZeros16

func TrailingZeros16(x uint16) (n int)

TrailingZeros16 returns the number of trailing zero bits in x; the result is 16 for x == 0.

Example

TrailingZeros16(0000000000001110) = 1

func TrailingZeros32

func TrailingZeros32(x uint32) int

TrailingZeros32 returns the number of trailing zero bits in x; the result is 32 for x == 0.

Example

TrailingZeros32(00000000000000000000000000001110) = 1

func TrailingZeros64

func TrailingZeros64(x uint64) int

TrailingZeros64 returns the number of trailing zero bits in x; the result is 64 for x == 0.

Example

TrailingZeros64(0000000000000000000000000000000000000000000000000000000000001110) = 1

func TrailingZeros8

func TrailingZeros8(x uint8) int

TrailingZeros8 returns the number of trailing zero bits in x; the result is 8 for x == 0.

Example

TrailingZeros8(00001110) = 1