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LLVM-GCC has included this function since version 1.5 in June 2005. [16] In the C++ Standard Library, the bit-array data structure bitset has a count() method that counts the number of bits that are set. In C++20, a new header <bit> was added, containing functions std::popcount and std::has_single_bit, taking arguments of unsigned integer types.
LZCNT is related to the Bit Scan Reverse (BSR) instruction, but sets the ZF (if the result is zero) and CF (if the source is zero) flags rather than setting the ZF (if the source is zero). Also, it produces a defined result (the source operand size in bits) if the source operand is zero.
Unlike the bitset in C++, the Java BitSet does not have a "size" state (it has an effectively infinite size, initialized with 0 bits); a bit can be set or tested at any index. In addition, there is a class EnumSet, which represents a Set of values of an enumerated type internally as a bit vector, as a safer alternative to bit fields.
The result of shifting by a bit count greater than or equal to the word's size is undefined behavior in C and C++. [ 2 ] [ 3 ] Right-shifting a negative value is implementation-defined and not recommended by good coding practice; [ 4 ] the result of left-shifting a signed value is undefined if the result cannot be represented in the result type.
The complementary operation that finds the index or position of the most significant set bit is log base 2, so called because it computes the binary logarithm ⌊log 2 (x)⌋. [1] This is closely related to count leading zeros ( clz ) or number of leading zeros ( nlz ), which counts the number of zero bits preceding the most significant one bit.
[1] [2] A bit field is most commonly used to represent integral types of known, fixed bit-width, such as single-bit Booleans. The meaning of the individual bits within the field is determined by the programmer; for example, the first bit in a bit field (located at the field's base address ) is sometimes used to determine the state of a ...
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An interface represents physical nodes and "virtual" result nodes of an operator. Instances of this interface are created on demand during a trie traversal. Compound expressions, involving more than one operator, can be expressed directly by combining these operators as an operator can be used as argument (input) for another operator.