re PR rtl-optimization/51044 (gfortran.dg/alloc_comp_class_2.f90 …

re PR rtl-optimization/51044 (gfortran.dg/alloc_comp_class_2.f90  gfortran.dg/widechar_intrinsics_10.f90 -O1 ICE)

	PR rtl-optimization/51044
	* dse.c (emit_inc_dec_insn_before): Ensure new_insn is an instruction
	rather than just insn body.

From-SVN: r181861

gcc/ChangeLog

 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

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;