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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.
If the hardware has instructions to compute half-precision math, it is often faster than single or double precision. If the system has SIMD instructions that can handle multiple floating-point numbers within one instruction, half precision can be twice as fast by operating on twice as many numbers simultaneously. [13]
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.
Protocol Buffers (Protobuf) is a free and open-source cross-platform data format used to serialize structured data. It is useful in developing programs that communicate with each other over a network or for storing data.
Lighting and reflection calculations, as in the video game OpenArena, use the fast inverse square root code to compute angles of incidence and reflection.. Fast inverse square root, sometimes referred to as Fast InvSqrt() or by the hexadecimal constant 0x5F3759DF, is an algorithm that estimates , the reciprocal (or multiplicative inverse) of the square root of a 32-bit floating-point number in ...
It is very slow and in practice done in a different and faster way resulting in fast syndrome-based compression. We split H {\displaystyle H} into sub-matrices H i {\displaystyle H_{i}} of size r × n / w {\displaystyle r\times n/w} and we fix a bijection from the bit strings of length w log ( n / w ) {\displaystyle w\log(n/w)} to the set ...
The MD5 message-digest algorithm is a widely used hash function producing a 128-bit hash value. MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4 , [ 3 ] and was specified in 1992 as RFC 1321.
[7] [8] [9] The trend of general-purpose computing on GPUs may lead to wider use of SIMD in the future. Adoption of SIMD systems in personal computer software was at first slow, due to a number of problems. One was that many of the early SIMD instruction sets tended to slow overall performance of the system due to the re-use of existing ...