hammingweight
Count the number of set bits in a 32-bit integer
8 bits representing the number 7 look like this: 00000111 Three bits are set. What are the algorithms to d开发者_如何学Goetermine the number of set bits in a 32-bit integer?This is known as the \'Ham[详细]
2023-03-05 18:27 分类：问答Hamming weight/population count in T-SQL
I\'m looking for a fast way to calculate the hamming weight/population count/\"the number of 1 bits\" of a BINARY(1024) field. MySQL has a BIT_COUNT function that does something like that. I couldn\'t[详细]
2023-03-04 11:26 分类：问答Optimizing Long.bitCount
I have a program that is making a huge number of calls to Long.bitCount(), so many that it is taking 33% of cycles on one CPU core.Is there a way to implement it that is faster than the Sun JDK versio[详细]
2023-02-07 05:07 分类：问答Counting the number of bits that are set
I want to count the number of bits in a binary number that are set. For example, user enter the number 97 which is 01100001 in binary. The program should give me that 3 bits are set using MIPS ISA.[详细]
2023-01-17 06:16 分类：问答Bit popcount for large buffer, with Core 2 CPU (SSSE3)
I\'m looking for the fastest way to popcount on large buffer of 512 or more bytes. I can guarantee any required alignment, and the buffer size is always a power of 2. The buffer corresponds to block a[详细]
2023-01-16 00:42 分类：问答How many 1s in an n-bit integer?
An interesting problem I ran into today: wha开发者_运维百科t is the fastest way to count the number of 1s in an n-bit integer? Is it possible to beat O(n)?[详细]
2022-12-09 19:16 分类：问答
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