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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...53 push rbx
4004e7: 31 db xor ebx,ebx
4004e9: 41 8d 34 1c lea esi,[r12+rbx*1]
4004ed: 41 8d 7c 1d 00 lea edi,[r13+rbx*1+0x0]
4004f2: e8 db ff ff ff call 4004d2 <_ZL3addRKiS0_.isra.0&g...
Best practices for overriding isEqual: and hash
...
A simple XOR over the hash values of critical properties is sufficient
99% of the time.
For example:
- (NSUInteger)hash
{
return [self.name hash] ^ [self.data hash];
}
Solution found at http://nshipster.com/equality/ by Mat...
How to reverse a singly linked list using only two pointers?
...out using a third. Simply cast the pointers to a int/long and perform the XOR operation a couple of times. This is one of those C tricks that makes for a fun question, but doesn't have any practical value.
Can you reduce the O(n) complexity? No, not really. Just use a doubly linked list if yo...
What does |= (single pipe equal) and &=(single ampersand equal) mean
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I think you want to use a XOR instead of an AND for this.
– GameZelda
Aug 4 '11 at 13:59
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How can I map True/False to 1/0 in a Pandas DataFrame?
...r: numpy boolean subtract, the -` operator, is deprecated, use the bitwise_xor, the ^ operator, or the logical_xor function instead.` Using @User's answer fixes this.
– Amadou Kone
Mar 13 '19 at 16:01
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Is there XNOR (Logical biconditional) operator in C#?
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XOR = A or B, but Not A & B or neither (Can't be equal [!=])
XNOR is therefore the exact oppoiste, and can be easily represented by == or ===.
However, non-boolean cases present problems, like in this example:
a = 5
b =...
Calculate last day of month in JavaScript
...0 : 31 days
That means you can shift the value 3 places with >> 3, XOR the bits with the original ^ m and see if the result is 1 or 0 in bit position 0 using & 1. Note: It turns out + is slightly faster than XOR (^) and (m >> 3) + m gives the same result in bit 0.
JSPerf results: ...
A Java collection of value pairs? (tuples?)
... a true tuple. For example the hashcode implementation in SimpleEntry just xors the codes of the elements, so <a,b> hashes to the same value as <b,a>. Tuple implementations often sort lexicographically, but SimpleEntry doesn't implement Comparable. So be careful out there...
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Merge multiple lines (two blocks) in Vim
...ng block (in the example in the question abc and def) have the same length XOR
the first line of the starting block is the longest, and you don't care about the additional spaces in between) XOR
The first line of the starting block is not the longest, and you additional spaces to the end.
...
Bash if statement with multiple conditions throws an error
...ither or both of its operands are true. You're thinking of "exclusive or" (XOR), which is true if exactly one of its operands is true. (Actually, there are versions of XOR that work on more than 2 operands, in which case it's true if an odd number of operands are true.)
– Gordo...