diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 2122acc2350a..b60098e50029 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2013-04-30  Richard Sandiford  <rsandifo@linux.vnet.ibm.com>
+
+	* explow.c (plus_constant): Pass "mode" to immed_double_int_const.
+	Use gen_int_mode rather than GEN_INT.
+
 2013-04-30  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* value-prof.c (stream_in_histogram_value): Remove the strayed
diff --git a/gcc/explow.c b/gcc/explow.c
index 08a66537b904..7da8bc75f193 100644
--- a/gcc/explow.c
+++ b/gcc/explow.c
@@ -106,10 +106,10 @@ plus_constant (enum machine_mode mode, rtx x, HOST_WIDE_INT c)
 	  if (overflow)
 	    gcc_unreachable ();
 
-	  return immed_double_int_const (v, VOIDmode);
+	  return immed_double_int_const (v, mode);
 	}
 
-      return GEN_INT (INTVAL (x) + c);
+      return gen_int_mode (INTVAL (x) + c, mode);
 
     case CONST_DOUBLE:
       {
@@ -124,7 +124,7 @@ plus_constant (enum machine_mode mode, rtx x, HOST_WIDE_INT c)
 	     To fix, add constant support wider than CONST_DOUBLE.  */
 	  gcc_assert (GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_DOUBLE_INT);
 
-	return immed_double_int_const (v, VOIDmode);
+	return immed_double_int_const (v, mode);
       }
 
     case MEM: