From 1d44a174235c0c57c938cc88cff5ec088146d4fa Mon Sep 17 00:00:00 2001
From: Miguel Sofer <miguel.sofer@gmail.com>
Date: Tue, 18 Mar 2008 18:52:07 +0000
Subject: fix and simplify the OFFSET computation for TclStackAlloc

---
 generic/tclExecute.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/generic/tclExecute.c b/generic/tclExecute.c
index 31df1a7..1677a78 100644
--- a/generic/tclExecute.c
+++ b/generic/tclExecute.c
@@ -13,7 +13,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclExecute.c,v 1.368 2008/03/18 17:58:30 dgp Exp $
+ * RCS: @(#) $Id: tclExecute.c,v 1.369 2008/03/18 18:52:07 msofer Exp $
  */
 
 #include "tclInt.h"
@@ -860,12 +860,11 @@ TclFinalizeExecution(void)
 
 static inline int
 OFFSET(
-    Tcl_Obj **markerPtr)
+    void *ptr)
 {
     int mask = TCL_ALLOCALIGN-1;
-    int base = PTR2INT(markerPtr) & 0xFFFFFF;
-    int new = (base + TCL_ALLOCALIGN) & ~mask;
-    return (new - base);
+    int base = PTR2INT(ptr) & mask;
+    return (TCL_ALLOCALIGN - base)/sizeof(Tcl_Obj**);
 }
 
 #define MEMSTART(markerPtr) \
-- 
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