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Refactoring improved adder implementation #359

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@msoeken msoeken commented Oct 26, 2020

This PRs refactors the recent changes by @TviNet in #358 to address #335.

With these changes the operations Carry and Sum are no longer needed inside the Standard library, but have been exposed as public API, and therefore cannot be removed.

@msoeken msoeken mentioned this pull request Oct 27, 2020
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I'm not sure I can approve this PR because I will need some more background on the refactor (and possibly an explanation with a whiteboard or so :)) but it looks like you also made some nice code formatting changes!

Standard/src/Arithmetic/Integer.qs Show resolved Hide resolved
CCNOT (carryIn, summand2, carryOut);
CCNOT(summand1, summand2, carryOut);
CNOT(summand1, summand2);
CCNOT(carryIn, summand2, carryOut);
}

/// # Summary
/// Implements a compute carry gate using a temporary logical-AND construction.
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Is this related to figure 1 in this paper (https://arxiv.org/pdf/1709.06648.pdf)? If yes could we link it here?

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This operation is not related to that paper. It has been used in the previous implementation, and only remains in the code, because it has been exposed as public API. It basically computes the majority-of-three function out-of-place into carryOut, but also changes the state of summand2.

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Ok thanks! Is there another reference we can link here?

Co-authored-by: Guen P <guenp@microsoft.com>
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