ifcvt.c (noce_process_if_block): Don't use an insn_b from test_bb if insn_a uses x.

        * ifcvt.c (noce_process_if_block): Don't use an insn_b from
        test_bb if insn_a uses x.

From-SVN: r33737

gcc/ChangeLog

@@ -5,6 +5,9 @@
 
 	* flow.c (mark_set_1): Respect not_dead when updating reg_live.
 
+	* ifcvt.c (noce_process_if_block): Don't use an insn_b from
+	test_bb if insn_a uses x.
+
 2000-05-06  Zack Weinberg  <zack@wolery.cumb.org>
 
  	* cpphash.h: Remove conditional #define of __extension__.

gcc/ifcvt.c

@@ -1078,7 +1078,8 @@ noce_process_if_block (test_bb, then_bb, else_bb, join_bb)
 	  || GET_CODE (insn_b) != INSN
 	  || (set_b = single_set (insn_b)) == NULL_RTX
 	  || ! rtx_equal_p (x, SET_DEST (set_b))
-	  || reg_mentioned_p (x, cond))
+	  || reg_mentioned_p (x, cond)
+	  || reg_mentioned_p (x, a))
 	insn_b = set_b = NULL_RTX;
     }
   b = (set_b ? SET_SRC (set_b) : x);