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Improve error handling, parametrize storage, and add operations (#8)
- Replace assert! and panic! error handling with propagation of Result
- <10% throughput hit at any benchmarked condition, and improvements for some
- Make inner functions for operations (potentially) fallible
- Supports explicitly checking slice lengths to eliminate panic branches
- Supports user-defined operations that are fallible
- Make intermediate storage customizable to better support both application-level and embedded usages
- Add const generic parametrization of the size of storage
- Add compile-time customizable alignment for storage
- Add new logical operations
- min, max (for strictly Ord types, not float), fmin, fmax (floating-point NaN-handling min and max), lt, le, gt, ge, eq, ne
- Logical operations return T::one() or T::zero() instead of boolean
- Update benchmarks to allocate separate arrays for all inputs
- This helps to more-fairly test the Vec based methods, which otherwise derive a distinct and unrealistic advantage from only operating on a single input array for a many-step expression
- This has a much smaller effect on strobe, as its main feature is to reduce dependence on the locality of the input data
- Benchmarks now show strobe out-performing simple vectorization recipes for realistic expressions of depth 2 and higher (was 3 and higher)