Why do SSE integer averaging instructions (PAVGB/PAVGW) add 1 to temporary sum before calculating final result?

It's to give correct rounding, i.e. Round to nearest rather than truncation. In general when you divide by N with integer values you need to do this to get correct rounding.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.