Optimization Opportunity: Single-Pass window() Function

[luketpeterson]

The window() function performs 2 threshold operations (high and low). But the expensive part is performing the counting, and that only needs to be done once.

The threshold counting functions can be re-used by the window() function for a single-pass implementation.

[Adam-Vandervorst]

There's also an opportunity for a logic_window like a decision tree, though I've found it quite hard to replicate in C++ with ternary functions (AVX-512) as I desire.

Links to current 2-pass implementations:
Python
C++