I cut lots of yew, and I cry a little every time I think about all the wood I've ruined from trying to split a log. I now always saw yew trying to get the most out of every log. Even here in yew country, nice yew is rare and tough to find.
Yew bark is real easy to read, and I'd never cut anything twisted or gnarly anyways. If the bark looks nice and straight, saw away. 8" is a huge log, please post a pic! Where do you live?