+(defun handle-nested-dynamic-extent-lvars (lvar)
+ (let ((uses (lvar-uses lvar)))
+ ;; Stack analysis wants DX value generators to end their
+ ;; blocks. Uses of mupltiple used LVARs already end their blocks,
+ ;; so we just need to process used-once LVARs.
+ (when (node-p uses)
+ (node-ends-block uses))
+ ;; If this LVAR's USE is good for DX, it is either a CAST, or it
+ ;; must be a regular combination whose arguments are potentially DX as well.
+ (flet ((recurse (use)
+ (etypecase use
+ (cast
+ (handle-nested-dynamic-extent-lvars (cast-value use)))
+ (combination
+ (loop for arg in (combination-args use)
+ when (lvar-good-for-dx-p arg)
+ append (handle-nested-dynamic-extent-lvars arg))))))
+ (cons lvar
+ (if (listp uses)
+ (loop for use in uses
+ when (use-good-for-dx-p use)
+ nconc (recurse use))
+ (when (use-good-for-dx-p uses)
+ (recurse uses)))))))
+