0.8.7.1:

[sbcl.git] / src / compiler / macros.lisp

diff --git a/src/compiler/macros.lisp b/src/compiler/macros.lisp
index e96a92b..c92c88a 100644 (file)
--- a/src/compiler/macros.lisp
+++ b/src/compiler/macros.lisp
@@ -631,15 +631,22 @@
 
 ;;; Like DO-NODES, only iterating in reverse order. Should be careful
 ;;; with block being split under us.
-(defmacro do-nodes-backwards ((node-var lvar block) &body body)
+(defmacro do-nodes-backwards ((node-var lvar block &key restart-p) &body body)
   (let ((n-block (gensym))
        (n-prev (gensym)))
     `(loop with ,n-block = ,block
-           for ,node-var = (block-last ,n-block) then (ctran-use ,n-prev)
+           for ,node-var = (block-last ,n-block) then
+                           ,(if restart-p
+                                `(if (eq ,n-block (ctran-block ,n-prev))
+                                     (ctran-use ,n-prev)
+                                     (block-last ,n-block))
+                                `(ctran-use ,n-prev))
            for ,n-prev = (when ,node-var (node-prev ,node-var))
            and ,lvar = (when (and ,node-var (valued-node-p ,node-var))
                         (node-lvar ,node-var))
-           while ,node-var
+           while ,(if restart-p
+                      `(and ,node-var (not (block-to-be-deleted-p ,n-block)))
+                      node-var)
            do (progn
                 ,@body))))