diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 66093b15d5b..1e06e7f516f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2011-11-30  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/51044
+	* dse.c (emit_inc_dec_insn_before): Ensure new_insn is an instruction
+	rather than just insn body.
+
 	PR target/50725
 	* function.c (thread_prologue_and_epilogue_insns): If
 	stack_realign_drap, add drap_reg to SET_UP_BY_PROLOGUE
diff --git a/gcc/dse.c b/gcc/dse.c
index ddabd3de0c6..13d2f27ca23 100644
--- a/gcc/dse.c
+++ b/gcc/dse.c
@@ -895,7 +895,12 @@ emit_inc_dec_insn_before (rtx mem ATTRIBUTE_UNUSED,
   /* We can reuse all operands without copying, because we are about
      to delete the insn that contained it.  */
   if (srcoff)
-    new_insn = gen_add3_insn (dest, src, srcoff);
+    {
+      start_sequence ();
+      emit_insn (gen_add3_insn (dest, src, srcoff));
+      new_insn = get_insns ();
+      end_sequence ();
+    }
   else
     new_insn = gen_move_insn (dest, src);
   info.first = new_insn;