@zukov
I checked with and without byte swapping in DOSBox for hi-res modes, and it seems didn't add any measurable difference for final usage with JIT.

Also doing some more tests, and the parts I found which suffer from an endian issue at the moment are:
1).taking a screenshot in 15/16/32 bit modes
2).recorded sound of a video recorded via ctrl+alt+f5. The video itself records and plays correctly, but audio completely noise as jmarsh saying before.