From: Guillermo J. Rozas <edu/mit/csail/zurich/gjr>
Date: Sun, 21 May 1989 03:57:49 +0000 (+0000)
Subject: Fix bug in node/noop?.  variable-assigned? can't be used because it is
X-Git-Tag: 20090517-FFI~12061
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=d3d39ce48060a914a29ddaf5ca311f92739a00e3;p=mit-scheme.git

Fix bug in node/noop?.  variable-assigned? can't be used because it is
set up by phase/design-environment-frames which runs AFTER
phase/subproblem-ordering which is using this procedure.
---

diff --git a/v7/src/compiler/fgopt/reuse.scm b/v7/src/compiler/fgopt/reuse.scm
index dc9f1849d..0809756e2 100644
--- a/v7/src/compiler/fgopt/reuse.scm
+++ b/v7/src/compiler/fgopt/reuse.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/fgopt/reuse.scm,v 1.2 1989/04/21 17:09:50 markf Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/fgopt/reuse.scm,v 1.3 1989/05/21 03:57:49 jinx Rel $
 
 Copyright (c) 1988 Massachusetts Institute of Technology
 
@@ -304,7 +304,11 @@ MIT in each case. |#
 	   (cond ((rvalue/reference? rvalue)
 		  (let ((variable (reference-lvalue rvalue)))
 		    (and (eq? target variable)
-			 (not (variable-in-cell? variable)))))
+			 ;; This is no good because this field
+			 ;; is not yet set up at this stage
+			 ;; of the compilation.
+			 ;; (not (variable-in-cell? variable))
+			 (not (variable-assigned? variable)))))
 		 ((rvalue/block? rvalue)
 		  (and (block? target)
 		       (eq? (block-parent target) rvalue)))