Shuffle comments around a bit.

[libpcap] / optimize.c

diff --git a/optimize.c b/optimize.c
index f143e8ad0280ef8d8c4c4440ec12abb3eaf92001..ccb4ab8ed6476646db3d349d1b060d0ef611b1c0 100644 (file)
--- a/optimize.c
+++ b/optimize.c
@@ -22,7 +22,7 @@
  */
 #ifndef lint
 static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/libpcap/optimize.c,v 1.81 2004-11-13 22:32:42 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/libpcap/optimize.c,v 1.82 2004-11-14 00:28:18 guy Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -1195,16 +1195,23 @@ opt_blk(b, do_stmts)
 
        /*
         * Initialize the atom values.
-        * If we have no predecessors, everything is undefined.
-        * Otherwise, we inherent our values from our predecessors.
-        * If any register has an ambiguous value (i.e. control paths are
-        * merging) give it the undefined value of 0.
         */
        p = b->in_edges;
-       if (p == 0)
+       if (p == 0) {
+               /*
+                * We have no predecessors, so everything is undefined
+                * upon entry to this block.
+                */
                memset((char *)b->val, 0, sizeof(b->val));
-       else {
+       } else {
+               /*
+                * Inherit values from our predecessors.
+                */
                memcpy((char *)b->val, (char *)p->pred->val, sizeof(b->val));
+               /*
+                * If any register has an ambiguous value (i.e., control
+                * paths are merging), give it the undefined value of 0.
+                */
                while ((p = p->next) != NULL) {
                        for (i = 0; i < N_ATOMS; ++i)
                                if (b->val[i] != p->pred->val[i])