Add clarifying comment
Add stub for SSE2 resizer cores. Combine common scalar code paths into a policy-based template function
Miscellaneous cleanups
SSE2 optimized core for f32. Direct port of AVX2 core (up to 30% slower)
Enable /arch:AVX2 and /arch:SSE2 for individual files
Cleanups
SSE2 optimized core for u16
Additional optimization heuristics