Dennis Sweeney

Based on https://github.com/psf/pyperf/issues/22: Example: ``` py -m pyperf compare_to ..\cpython\floatbench.json ..\multiply\floatbench.json --table --win_percentage +----------------+----------------------------+-----------------------------------------------+ | Benchmark | ..\cpython\floatbench.json | ..\multiply\floatbench.json | +================+============================+===============================================+ | int: x*x | 28.5 ns | 27.7...

gh-97912: Avoid quadratic behavior when adding LOAD_FAST_CHECK

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* Issue: gh-97912

Avoid `exc=None; del exc` in bytecode where unnecessary

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See https://github.com/faster-cpython/ideas/issues/490. To break reference cycles, the compiler has an implicit `del e` at the end of an exception handler. To make `UnboundLocalError`s impossible during that deletion, the compiler adds...

Functional changes: * `DELETE_FAST` now assumes its argument is bound; it no longer raises `UnboundLocalError` by itself. * When the state of a local is uncertain, `del x` compiles to...

Request: Cythonize `dhsw_snf`

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### Problem Description The `dhsw_snf` function in [`matrix_utils.py`](https://github.com/sagemath/sage/blob/develop/src/sage/homology/matrix_utils.py) seems to be the bottleneck in some chain complex integral homology computations that I'm running. I'm working with matrices roughly of the...