Index: flow.c
===================================================================
RCS file: /cvs/gcc/egcs/gcc/flow.c,v
retrieving revision 1.324
diff -u -r1.324 flow.c
--- flow.c	2000/08/14 05:59:49	1.324
+++ flow.c	2000/08/15 14:35:30
@@ -5562,11 +5562,13 @@
 			  * INTVAL (XEXP (SET_SRC (x), 1)));
   int regno = REGNO (SET_DEST (x));
   rtx y = pbi->reg_next_use[regno];
+
   if (y != 0
       && BLOCK_NUM (y) == BLOCK_NUM (insn)
-      /* Don't do this if the reg dies, or gets set in y; a standard addressing
-	 mode would be better.  */
-      && ! dead_or_set_p (y, SET_DEST (x))
+      /* We cannot use pre-increment if y clobbers the register REGNO.
+         We can still consider a register that is not used after y,
+         hoping pre-increment is faster than indexed addressing.  */
+      && ! reg_set_p (SET_DEST (x), y)
       && try_pre_increment (y, SET_DEST (x), amount))
     {
       /* We have found a suitable auto-increment