# `nupp.math.u64` Unsigned 64-bit bit counts and prefix parity. ## Functions ### `andBits` _function_ ```nupp local andBits: @nosuspend function(a: uint64, b: uint64): uint64 ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `a` | `uint64` | | | `b` | `uint64` | | #### Returns | Type | Description | | --- | --- | | `uint64` | | ### `leadingZeros` _function_ ```nupp local leadingZeros: @nosuspend function(a: uint64): uint32 ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `a` | `uint64` | | #### Returns | Type | Description | | --- | --- | | `uint32` | | ### `popcount` _function_ ```nupp local popcount: @nosuspend function(a: uint64): uint32 ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `a` | `uint64` | | #### Returns | Type | Description | | --- | --- | | `uint32` | | ### `prefixXor` _function_ ```nupp local prefixXor: @nosuspend function(a: uint64): uint64 ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `a` | `uint64` | | #### Returns | Type | Description | | --- | --- | | `uint64` | | ### `sub` _function_ ```nupp local sub: @nosuspend function(a: uint64, b: uint64): uint64 ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `a` | `uint64` | | | `b` | `uint64` | | #### Returns | Type | Description | | --- | --- | | `uint64` | | ### `trailingZeros` _function_ ```nupp local trailingZeros: @nosuspend function(a: uint64): uint32 ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `a` | `uint64` | | #### Returns | Type | Description | | --- | --- | | `uint32` | |