cse.c (count_reg_usage): Count registers used in addresses of CLOBBERs.

        * cse.c (count_reg_usage): Count registers used in addresses of
        CLOBBERs.

From-SVN: r21012

gcc/ChangeLog

+Wed Jul  8 21:43:14 1998  Jeffrey A Law  (law@cygnus.com)
+
+	* cse.c (count_reg_usage): Count registers used in addresses of
+	CLOBBERs.
+
 Wed Jul  8 15:08:29 1998  Jim Wilson  <wilson@cygnus.com>
 
 	* Makefile.in (STAGESTUFF): Readd line lost during June 9 FSF merge.

gcc/cse.c

@@ -8784,7 +8784,13 @@ count_reg_usage (x, counts, dest, incr)
     case CONST_DOUBLE:
     case SYMBOL_REF:
     case LABEL_REF:
-    case CLOBBER:
+      return;
+
+    case CLOBBER:                                                        
+      /* If we are clobbering a MEM, mark any registers inside the address
+         as being used.  */
+      if (GET_CODE (XEXP (x, 0)) == MEM)
+	count_reg_usage (XEXP (XEXP (x, 0), 0), counts, NULL_RTX, incr);
       return;
 
     case SET: