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Module `core.bitop`

This module contains a collection of bit-level operations.

Functions

Name	Description
`_popcnt(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(x)`	Reverses the order of bits in a 32-bit integer.
`bitswap(x)`	Reverses the order of bits in a 64-bit integer.
`bsf(v)`	Scans the bits in v starting with bit 0, looking for the first set bit.
`bsr(v)`	Scans the bits in v from the most significant bit to the least significant bit, looking for the first set bit.
`bswap(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(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(p, bitnum)`	Tests the bit. (No longer an intrisic - the compiler recognizes the patterns in the body.)
`btc(p, bitnum)`	Tests and complements the bit.
`btr(p, bitnum)`	Tests and resets (sets to 0) the bit.
`bts(p, bitnum)`	Tests and sets the bit.
`byteswap(x)`	Swaps bytes in a 2 byte ushort.
`inp(port_address)`	Reads I/O port at port_address.
`inpl(port_address)`	Reads I/O port at port_address.
`inpw(port_address)`	Reads I/O port at port_address.
`outp(port_address, value)`	Writes and returns value to I/O port at port_address.
`outpl(port_address, value)`	Writes and returns value to I/O port at port_address.
`outpw(port_address, value)`	Writes and returns value to I/O port at port_address.
`popcnt(x)`	Calculates the number of set bits in an integer.
`rol(value, count)`	Bitwise rotate `value` left (`rol`) or right (`ror`) by `count` bit positions.
`ror(value, count)`	Bitwise rotate `value` left (`rol`) or right (`ror`) by `count` bit positions.

Structs

Name	Description
`BitRange`	Range over bit set. Each element is the bit number that is set.

Authors

Don Clugston, Sean Kelly, Walter Bright, Alex Rønne Petersen, Thomas Stuart Bockman

License

Boost License 1.0