Edge case segfault with 0 OpenCL/CUDA devices

This release fixes an edge case that leads to a segmentation fault, when QTensorNetwork is used in the presence of 0 available OpenCL/CUDA devices.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.42...vm6502qv9.9.46
v1.30.25...v1.30.26

sha1sum results:
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QBDD deadlock fix (and style)

A potential deadlock in QBDD Kronecker products has been fixed. Beyond that, several (non-breaking) function prototype changes have been made in accordance with standards for style.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.37...vm6502q.v9.9.42
v1.30.24...v1.30.25

sha1sum results:
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QBDD and stabilizer optimization

QBDD and stabilizer methods have been optimized. An incorrect initialization of a default QEngine property was also fixed in the default constructor (though the incorrect initialization likely had no consequence).

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.33...vm6502q.v9.9.37
v1.30.23...v1.30.24

sha1sum results:
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QBdt and BigInteger debugging and performance

QBdt and BigInteger (alias bitCapInt) have been debugged. Additionally, one should see drastically improved performance with QBdt (despite significantly reduced parallelism utilization). Systemically, on GNU/Linux, the bitCapInt type now uses 128-bit "words" rather than 64-bit words, which should lead to some performance improvement.

Note that previous releases were almost universally built with capacity for 4095 qubits in a single simulator instance; in practicality, little besides stabilizer simulation can take advantage of the vast majority of this addressing capacity. This release limits to 127 qubits in a single simulator instance, but this is a "feasible" width for Qrack approximation techniques, and performance benefits from the change.

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.28...vm6502q.v9.9.33
v1.30.22...v1.30.23

sha1sum results:
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Stable maintenance release (debugging and style)

The past couple of months have seen almost exclusively style and debugging changes in Qrack. (We experimented with fixed-point math for certain applications, but it was only suitable on GNU/Linux, and the experiments mostly proved we are better leaving out fixed-point for now.) This release compared the current head of main branch to the state of Qrack about 2 months ago and whittled down the diff to a small and trustworthy set of bug fixes and adjustments according to style guide.

This release might constitute a relatively "complete" state of the core Qrack project, for a significant amount of time into the future. (Most future development is likely to focus on building out support for other quantum software frameworks.)

(Note that releases of PyQrack now aim to be semantic over build artifacts.)

Happy Qracking! You rock!

Full Changelog:
v1.30.20...v1.30.22
unitaryfund/qrack@vm6502q.v9.9.23...vm6502q.v9.9.28

sha1sum results:
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f556473d0494a602c1e90c995b6e9c3f83b37be7 pyqrack-1.30.22.tar.gz

QBdt debugging

QBdt error amortization suffered from an out-of-precision bug; this has been (completely) fixed.

(Note that release number is being considered semantic relative to artifacts.)

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.22...vm6502q.v9.9.23
v1.30.16...v1.30.20

sha1sum results:
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OpenCL kernel (and other) optimizations; Ubuntu PowerPC fix

Various micro-optimizations have been added, including OpenCL kernel optimizations. Because of OpenCL kernel updates, perform the following commands as necessary in the qrack repository directory:

$ make clean
$ cmake ..
$ ./qrack_cl_precompile

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.13...vm6502q.v9.9.22
v1.30.15...v1.30.16

sha1sum results:
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QUnitStateVector and QEngineOCL debugging

A new class QUnitStateVector can hold Schmidt-decomposed representation of state vectors. For now, specifically, it is used only for near-Clifford simulation with QUnitClifford.

A long-standing edge case in QEngineOCL::MAll() has also been fixed.

Full Changelog: v1.30.13...v1.30.15

sha1sum results:
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Random number generation improvements

Minor improvements have been made to Qrack's random number generator API. Most importantly, 32 divisions have been replaced with 32 multiplications when generating a random float with Rand(). Another possible point of improvement is that most-significant bit of the raw random bit stream now corresponds with most-significant bit of Rand(), where some devices and services for random number generation will tend to prioritize most-significant bit as slightly less biased for randomness than least-significant.

Full Changelog: unitaryfund/qrack@vm6502q.v9.9.8...vm6502q.v9.9.9

sha1sum results:
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Debug shared library observables API

This release fixes bugs in the observables API of the shared library. (It also fixes 16-bit floating-point builds, but this does not affect the packaged artifacts.)

Full Changelog: unitaryfund/qrack@vm6502q.v9.9.7...vm6502q.v9.9.8

sha1sum results:
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