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Recent questions tagged bit

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bit manipulation - Computing the Parity

I don't fully understand this algorithm of calculating the parity bit. Can someone please explain in detail? The following ... return y & 1; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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498 views

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bit manipulation - Swapping bits at a given point between two bytes

Let's say I have these two numbers: x = 0xB7 y = 0xD9 Their binary representations are: x = 1011 0111 y = ... Bitwise, how can I achieve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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474 views

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bit manipulation - Why does OR 0 round numbers in Javascript?

I'm under the impression that the Number type in Javascript stores any number, integer or float, according to the ... IEEE). Is this correct? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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478 views

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bit manipulation - Why does bitwise AND of two short values result in an int value in Java?

short permissions = 0755; short requested = 0700; short result = permissions & requested; I get a compiler ... (short) permissions & requested See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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681 views

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bit manipulation - Signed extension from 24 bit to 32 bit in C++

I have 3 unsigned bytes that are coming over the wire separately. [byte1, byte2, byte3] I need to convert ... is using two's complement. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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677 views

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bit manipulation - Python: Set Bits Count (popcount)

Few blob's have been duplicated in my database(oracle 11g), performed XOR operations on the blob using UTL_RAW.BIT_XOR ... in a 32-bit integer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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504 views

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bit fields - C++ bitfield packing with bools

I've just done a test with bitfields, and the results are surprising me. class test1 { public: bool test_a:1; bool ... C++ Builder 2007, btw...) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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669 views

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bit manipulation - How to efficiently de-interleave bits (inverse Morton)

This question: How to de-interleave bits (UnMortonizing?) has a good answer for extracting one of the two halves ... (either scalar or SIMD). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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333 views

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bit manipulation - Adding two numbers without + operator (Clarification)

I know that we can use the logic of binary adder where Sum = a XOR b and Carry = a AND b I have ... or multiplied by 2 during each recursion? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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519 views

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bit manipulation - Simplest way to check if two integers have same sign?

Which is the simplest way to check if two integers have same sign? Is there any short bitwise trick to do this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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504 views

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bit manipulation - Why is "i & (i ^ (i - 1))" equivalent to "i & (-i)"

I had this in part of the code. Could anyone explain how i & (i ^ (i - 1)) could be reduced to i & (-i)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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447 views

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bit fields - Questions about C bitfields

Is bitfield a C concept or C++? Can it be used only within a structure? What are the other places we can ... OUTPUT: sizeof struct s = 12 bytes See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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511 views

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bit manipulation - Difference between signed and unsigned on bitwise operations

Is there any difference between signed and unsigned variables on bitwise operations? For example,when dealing with ... with signed numbers? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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474 views

1 answer

bit manipulation - How do I represent and work with n-bit vectors in Python?

In an assignment I am currently working on we need to work with bit vectors, but I am very unsure of how to ... vector and ignoring the 4 bits. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

544 views

1 answer

bit manipulation - How to de-interleave bits (UnMortonizing?)

What is the most efficient way to de-interleave bits from a 32 bit int? For this particular case, I'm only ... to improve speed or reduce space? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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804 views

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bit manipulation - C Programming - XOR Bitwise Operation

What operation does the following C' statement perform? star = star ^ 0b00100100; (A) Toggles bits 2 and 5 of ... . Can someone help me out? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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760 views

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bit manipulation - Fastest way to set __m256 value to all ONE bits

How can I set a value of 1 to all bits in an __m256 value? Using either AVX or AVX2 intrinsics? To get ... setzero, followed by a vector NOT. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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744 views

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bit shift - Declaring 64-bit variables in C

I have a question. uint64_t var = 1; // this is 000000...00001 right? And in my code this works: var ^ (1 << ... var ^ ( (uint64_t) 1 << 43 ) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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790 views

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bit manipulation - Check if a number is non zero using bitwise operators in C

Check whether a number x is nonzero using the legal operators except !. Examples: isNonZero(3) = 1, isNonZero(0) ... we do it without using ! ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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626 views

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bit manipulation - The difference between logical shift right, arithmetic shift right, and rotate right

I've been reading the classic Hacker's delight and I am having trouble understanding the difference between logical ... doubt seems too simple. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

629 views

1 answer

bit manipulation - Bits counting algorithm (Brian Kernighan) in an integer time complexity

Can someone explains why Brian Kernighan's algorithm takes O(log N) to count set bits (1s) in an integer. A simple ... how we get O(log N). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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683 views

1 answer

bit manipulation - Why should I use bitwise/bitmask in PHP?

I am working on a user-role / permission system in PHP for a script. Below is a code using a bitmask method for ... echo 'Access denied.'; } ?> See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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564 views

1 answer

bit manipulation - How do I get bit-by-bit data from an integer value in C?

I want to extract bits of a decimal number. For example, 7 is binary 0111, and I want to get 0 1 1 1 all ... , can I do something else for this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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470 views

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bit manipulation - Weird result of Java Integer left shift

I'm a little confused now by java left shift operation, 1<<31 = 0x80000000 --> this I can understand ... effort when compile to instructions. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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397 views

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bit manipulation - Bitwise Multiply and Add in Java

I have the methods that do both the multiplication and addition, but I'm just not able to get my head ... to learn bitwise operations in Java. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

656 views

1 answer

bit manipulation - Is there a way to perform a circular bit shift in C#?

I know that the following is true int i = 17; //binary 10001 int j = i << 1; //decimal 34, binary ... a single operation, not a for loop. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

490 views

1 answer

bit manipulation - Checking flag bits java

I have a problem with flag bits. I have an int variable to hold flags. First I set some flags to that variable. ... I don't know to do it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

481 views

1 answer

bit manipulation - Javascript Tilde & Two's complement

Two's complement method - generates -(x + 1). for example when JavaScript encounters the Tilde he uses this method ... where this -6 came from ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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