diff --git a/gcc/reload1.c b/gcc/reload1.c
index 62ac6d71d1fa..80cb8c3933f8 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -8305,6 +8305,9 @@ reload_cse_record_set (set, body)
 		continue;
 	      if (dest_mode == GET_MODE (XEXP (x, 0)))
 		tmp = XEXP (x, 0);
+	      else if (GET_MODE_BITSIZE (dest_mode)
+		        > GET_MODE_BITSIZE (GET_MODE (XEXP (x, 0))))
+		continue;
 	      else
 		tmp = gen_lowpart_common (dest_mode, XEXP (x, 0));
 	      if (tmp)