Change #252849

Comments

swscale/ops_optimizer: apply optimizations in a more predictable order
Instead of blindly interleaving re-ordering and minimizing optimizations,
separate this loop into several passes - the first pass will minimize the
operation list in-place as much as possible, and the second pass will apply any
desired re-orderings. (We also want to try pushing clear back before any other
re-orderings, as this can trigger more phase 1 optimizations)

This restructuring leads to significantly more predictable and stable behavior,
especially when introducing more operation types going forwards. Does not
actually affect the current results, but matters with some upcoming changes
I have planned.

Changed files

• libswscale/ops_optimizer.c