re PR rtl-optimization/40086 (cris-elf gfortran.dg/forall_1.f90 -O1 execution)

	PR rtl-optimization/40086
	* reorg.c (relax_delay_slots): When looking for redundant insn at
	the branch target, use next_real_insn, not next_active_insn.

From-SVN: r154751

gcc/ChangeLog

+2009-11-30  Hans-Peter Nilsson  <hp@axis.com>
+
+	PR rtl-optimization/40086
+	* reorg.c (relax_delay_slots): When looking for redundant insn at
+	the branch target, use next_real_insn, not next_active_insn.
+
 2009-11-30  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* doc/install.texi: Update minimum MPC version to 0.8.

gcc/reorg.c

@@ -3506,8 +3506,11 @@ relax_delay_slots (rtx first)
 	    }
 
 	  /* If the first insn at TARGET_LABEL is redundant with a previous
-	     insn, redirect the jump to the following insn process again.  */
-	  trial = next_active_insn (target_label);
+	     insn, redirect the jump to the following insn and process again.
+	     We use next_real_insn instead of next_active_insn so we
+	     don't skip USE-markers, or we'll end up with incorrect
+	     liveness info.  */
+	  trial = next_real_insn (target_label);
 	  if (trial && GET_CODE (PATTERN (trial)) != SEQUENCE
 	      && redundant_insn (trial, insn, 0)
 	      && ! can_throw_internal (trial))