* loop.c (insert_loop_mem): Ignore memory clobbers.

From-SVN: r30973

gcc/ChangeLog

@@ -6,6 +6,8 @@ Thu Dec 16 10:43:35 MET 1999  Jan Hubicka  <hubicka@freesoft.cz>
 
 Thu Dec 16 02:41:26 1999  Richard Henderson (rth@cygnus.com)
 
+	* loop.c (insert_loop_mem): Ignore memory clobbers.
+
 	* combine.c (simplify_comparison): Reduce (OP (MINUS A B) 0)
 	to (OP A B).
 

gcc/loop.c

@@ -9643,6 +9643,10 @@ insert_loop_mem (mem, data)
     case MEM:
       break;
 
+    case CLOBBER:
+      /* We're not interested in MEMs that are only clobbered.  */
+      return -1;
+
     case CONST_DOUBLE:
       /* We're not interested in the MEM associated with a
 	 CONST_DOUBLE, so there's no need to traverse into this.  */