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<a href="https://github.com/ProjectQ-Framework/ProjectQ/commit/<a class=hub.com/ProjectQ-Framework/ProjectQ/commit/f27286f520ff8b1ca2dec9142b01b59a2490fcd5">f27286f52<a href="https://github.com/ProjectQ-Framework/ProjectQ/commit/f27286f520ff8b1ca2dec9142b01b59a2490fcd5">&quot;&gt;C++ simulator performance improvements (#329)

* C++ simulator performance: make the swap-gate run in native C++

It was defined as a BasicMathGate before which made it run as python
code through the emulate_math_wrapper. The new variant just uses its
matrix representation to run it in native code.

* C++ simulator performance: add dedicated C++ code for common math gates

The BasicMathGate uses a C++ python wrapper (emulate_math_wrapper) to allow generic
calculations which makes it very slow. This detects some math gates and
provides a native C++ implementation for it.

* C++ simulator performance: use larger memory alignment

* C++ simulator performance: recycle large StateVector memory buffers

This avoids costly std::vector copying/reallocations by using some
static std::vector to reuse the allocated buffer (just by std::swap&amp;#39;ing
a vector into a buffer for later use when it would be deallocated
otherwise).

* C++ simulator performance: improve compiler flags

* Add test coverage for constant math emulation

* Revert &amp;quot;Add test coverage for constant math emulation&quot;

This reverts commit </a><a class="double-link" href="https://github.com/ProjectQ-Framework/ProjectQ/commit/<a class="double-link" href="https://github.com/ProjectQ-Framework/ProjectQ/commit/3bb8a2cc7fd595db48b0f4d260124ccfe60d7fcf">3bb8a2cc7</a>">3bb8a2cc7</a><a href="https://github.com/ProjectQ-Framework/ProjectQ/commit/f27286f520ff8b1ca2dec9142b01b59a2490fcd5">.

* Add test coverage for constant math emulation

54 of 54 new or added lines in 3 files covered. (100.0%)

12237 of 12261 relevant lines covered (99.8%)

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