Hammer drill is for running 3/16 holes in masonary, and not well at that. I have a corded Hilti hammer drill, a corded Milwaukee 1/2 Hole shooter w/hammer option, and a 24v Bosch hammer drill, I never use them as hammer drills. I do however own a Bosch 1" rotary hammer, and as "danski" pointed out, you dont want a hammer drill for 1/2" anchors. Its a tall order, asking a hammer drill to run 1/2" holes, but its a hot knife through butter with a rotary hammer.
That said, rent or borrow one from somebody. Surely dont go buy a hammer drill, unless you see yourself drilling masonry to hang pictures in the future, because that is about all they are good for, drilling holes for Tapcons, even then I still use the Rotary Hammer, because the hammer drill is LOUD and SLOW chasing tiny drill bits, let alone a 1/2".