core.bitop

This module contains a collection of bit-level operations.

Members

Functions

_popcnt ushort _popcnt(ushort x)
int _popcnt(uint x)
int _popcnt(ulong x): Calculates the number of set bits in an integer using the X86 SSE4 POPCNT instruction. POPCNT is not available on all X86 CPUs.
bitswap uint bitswap(uint x): Reverses the order of bits in a 32-bit integer.
bitswap ulong bitswap(ulong x): Reverses the order of bits in a 64-bit integer.
bsf int bsf(uint v)
int bsf(ulong v): Scans the bits in v starting with bit 0, looking for the first set bit.
bsr int bsr(uint v)
int bsr(ulong v): Scans the bits in v from the most significant bit to the least significant bit, looking for the first set bit.
bswap uint bswap(uint v): Swaps bytes in a 4 byte uint end-to-end, i.e. byte 0 becomes byte 3, byte 1 becomes byte 2, byte 2 becomes byte 1, byte 3 becomes byte 0.
bswap ulong bswap(ulong v): Swaps bytes in an 8 byte ulong end-to-end, i.e. byte 0 becomes byte 7, byte 1 becomes byte 6, etc. This is meant to be recognized by the compiler as an intrinsic.
bt int bt(size_t* p, size_t bitnum): Tests the bit. (No longer an intrisic - the compiler recognizes the patterns in the body.)
btc int btc(size_t* p, size_t bitnum): Tests and complements the bit.
btr int btr(size_t* p, size_t bitnum): Tests and resets (sets to 0) the bit.
bts int bts(size_t* p, size_t bitnum): Tests and sets the bit.
byteswap ushort byteswap(ushort x): Swaps bytes in a 2 byte ushort.
inp ubyte inp(uint port_address)
inpl uint inpl(uint port_address)
inpw ushort inpw(uint port_address): Reads I/O port at port_address.
outp ubyte outp(uint port_address, ubyte value)
outpl uint outpl(uint port_address, uint value)
outpw ushort outpw(uint port_address, ushort value): Writes and returns value to I/O port at port_address.
popcnt int popcnt(uint x)
int popcnt(ulong x): Calculates the number of set bits in an integer.
rol T rol(T value, uint count)
T rol(T value)
ror T ror(T value, uint count)
T ror(T value): Bitwise rotate value left (rol) or right (ror) by count bit positions.

Structs

BitRange struct BitRange: Range over bit set. Each element is the bit number that is set.

core.bitop

Members

Functions

Structs

Meta

Source

License

Copyright

Authors