;; (in the ordinary build procedure anyway) essentially everything
;; which is reachable at this point will remain reachable for the
;; entire run.
- #+sbcl (sb-ext:purify)
+ ;;
+ ;; (Except that purifying actually slows down GENCGC). -- JES, 2006-05-30
+ #+(and sbcl (not gencgc))
+ (sb-ext:purify)
(values))