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bit manipulation
Bit manipulation is the act of algorithmically manipulating bits or other pieces of data shorter than a word. Computer programming tasks that require bit manipulation include low-level device control, error detection and correction algorithms, data compression, encryption algorithms, and optimization. For most other tasks, modern programming languages allow the programmer to work directly with abstractions instead of bits that represent those abstractions. Source code that does bit manipulation makes use of the bitwise operations: AND, OR, XOR, NOT, and bit shifts.
Bit manipulation, in some cases, can obviate or reduce the need to loop over a data structure and can give many-fold speed ups, as bit manipulations are processed in parallel, but the code can become more difficult to write and maintain.
== Terminology ==
''Bit twiddling'' and ''bit bashing'' are often used interchangeably with bit manipulation, but sometimes exclusively refer to clever or non-obvious ways or uses of bit manipulation, or tedious or challenging low-level device control data manipulation tasks.
The term ''bit twiddling'' dates from early computing hardware, where computer operators would make adjustments by tweaking or ''twiddling'' computer controls. As computer programming languages evolved, programmers adopted the term to mean any handling of data that involved bit-level computation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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