tree.c (build1): Set TREE_SIDE_EFFECTS for expressions that always have side-effects.

        * tree.c (build1): Set TREE_SIDE_EFFECTS for expressions that
        always have side-effects.  Use memset not bzero.
        (make_node): Likewise.

From-SVN: r29817

1 files changed, 24 insertions, 3 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 221afba..8f70747 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -1028,7 +1028,7 @@ make_node (code)
   else
     {
       t = (tree) obstack_alloc (obstack, length);
-      bzero ((PTR) t, length);
+      memset ((PTR) t, 0, length);
     }
 
 #ifdef GATHER_STATISTICS
@@ -3115,8 +3115,10 @@ build1 (code, type, node)
   if (ggc_p)
     t = ggc_alloc_tree (length);
   else
-    t = (tree) obstack_alloc (obstack, length);
-  bzero ((PTR) t, length);
+    {
+      t = (tree) obstack_alloc (obstack, length);
+      memset ((PTR) t, 0, length);
+    }
 
 #ifdef GATHER_STATISTICS
   tree_node_counts[(int)kind]++;
@@ -3138,6 +3140,25 @@ build1 (code, type, node)
 	TREE_RAISES (t) = 1;
     }
 
+  switch (code)
+    {
+    case INIT_EXPR:
+    case MODIFY_EXPR:
+    case VA_ARG_EXPR:
+    case RTL_EXPR:
+    case PREDECREMENT_EXPR:
+    case PREINCREMENT_EXPR:
+    case POSTDECREMENT_EXPR:
+    case POSTINCREMENT_EXPR:
+      /* All of these have side-effects, no matter what their
+	 operands are.  */
+      TREE_SIDE_EFFECTS (t) = 1;
+      break;
+	  
+    default:
+      break;
+    }
+
   return t;
 }