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Using the XOR swap algorithm to exchange nibbles between variables without the use of temporary storage. In computer programming, the exclusive or swap (sometimes shortened to XOR swap) is an algorithm that uses the exclusive or bitwise operation to swap the values of two variables without using the temporary variable which is normally required.
The simplest and probably most widely used method to swap two variables is to use a third temporary variable: define swap (x, y) temp := x x := y y := temp While this is conceptually simple and in many cases the only convenient way to swap two variables, it uses extra memory.
One would assume that "swapping a variable with itself" effectively does nothing. The standard, intuitive algorithm that uses a temporary variable indeed comes out that way, but the XOR algorithm will xor the variable with itself, thus setting it to zero instead. But this is wrong. Why don't we let A = B = 5, and see what happens: A := A xor B
Temporary variables, along with XOR swaps and arithmetic operators, are one of three main ways to exchange the contents of two variables. To swap the contents of variables "a" and "b" one would typically use a temporary variable temp as follows, so as to preserve the data from a as it is being overwritten by b: temp := a a := b b := temp
1 cup (2 sticks) unsalted butter, at room temperature. 2 large eggs. 2 3/4 cups flour. 1/4 cup instant vanilla pudding mix. 1 teaspoon cream of tartar1 teaspoon baking soda. 1 teaspoon salt.
Olena Ruban/Getty Images. 4. Incompatible: Taurus and Aquarius. The zodiac’s bull is stable and predictable, especially in matters of the heart.That can spell romance and reliability for some ...
Single compare, double swap Compares one pointer but writes two. The Itanium's cmp8xchg16 instruction implements this, [15] where the two written pointers are adjacent. Multi-word compare-and-swap Is a generalisation of normal compare-and-swap. It can be used to atomically swap an arbitrary number of arbitrarily located memory locations.
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