reorg.c (fill_slots_from_thread): Check side_effects_p when trying the "opposite…

reorg.c (fill_slots_from_thread): Check side_effects_p when trying the "opposite arithmetic" approach.

	* reorg.c (fill_slots_from_thread): Check side_effects_p when
	trying the "opposite arithmetic" approach.

From-SVN: r33125

gcc/ChangeLog

+Wed Apr 12 22:44:11 2000  Hans-Peter Nilsson  <hp@axis.com>
+
+	* reorg.c (fill_slots_from_thread): Check side_effects_p when
+	trying the "opposite arithmetic" approach.
+
 Wed Apr 12 20:51:20 2000  J"orn Rennecke <amylaar@cygnus.co.uk>
 
 	* sh.h (STRUCT_VALUE): Just 0 for TARGET_HITACHI.

gcc/reorg.c

@@ -2808,7 +2808,8 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
       dest = SET_DEST (pat), src = SET_SRC (pat);
       if ((GET_CODE (src) == PLUS || GET_CODE (src) == MINUS)
 	  && rtx_equal_p (XEXP (src, 0), dest)
-	  && ! reg_overlap_mentioned_p (dest, XEXP (src, 1)))
+	  && ! reg_overlap_mentioned_p (dest, XEXP (src, 1))
+	  && ! side_effects_p (pat))
 	{
 	  rtx other = XEXP (src, 1);
 	  rtx new_arith;