-;;; Called after a transform has been applied to CALL: if the call has a DX
-;;; result, propagate the DXness to the new functional as well.
-;;;
-;;; This is needed in case an earlier call to LOCALL-ANALYZE-COMPONENT
-;;; collected DX information before the transformation, in which case a later
-;;; call to LOCALL-ANALYZE-COMPONENT would not pick up the DX declaration
-;;; again, since the call has already been converted. (In other words, work
-;;; around the fact that optimization iterates, and locall analysis may have
-;;; already run by the time we are able to transform something.)
-(defun maybe-propagate-dynamic-extent (call fun)
- (when (lambda-p fun)
- (let* ((lvar (combination-lvar call))
- (cleanup (or (and lvar (lvar-dynamic-extent lvar))
- (return-from maybe-propagate-dynamic-extent)))
- (ret (lambda-return fun))
- (res (if ret
- (return-result ret)
- (return-from maybe-propagate-dynamic-extent)))
- (dx (car (rassoc lvar (cleanup-info cleanup) :test #'eq)))
- (new-dx-lvars (if (and dx res)
- (handle-nested-dynamic-extent-lvars dx res)
- (return-from maybe-propagate-dynamic-extent))))
- (when new-dx-lvars
- ;; This builds on what RECOGNIZE-DYNAMIC-EXTENT-LVARS does above.
- (aver (eq call (block-last (node-block call))))
- (dolist (cell new-dx-lvars)
- (let ((lvar (cdr cell)))
- (aver (not (lvar-dynamic-extent lvar)))
- (push cell (cleanup-info cleanup))
- (setf (lvar-dynamic-extent (cdr cell)) cleanup)))))))
-