diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index fe1d9c3b257063d71e0154868fa03454ad70be3e..a9263afaef24272bc68c7802efeb184a2f48ea94 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+2016-11-16  Richard Sandiford  <richard.sandiford@arm.com>
+	    Alan Hayward  <alan.hayward@arm.com>
+	    David Sherwood  <david.sherwood@arm.com>
+
+	* expr.c (emit_group_load_1): Tighten check for whether an
+	access involves only one operand of a CONCAT.  Use extract_bit_field
+	for constants if the bit range does span the whole operand.
+
 2016-11-16  Richard Sandiford  <richard.sandiford@arm.com>
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>
diff --git a/gcc/expr.c b/gcc/expr.c
index 0b0946de3457051ec848fceafe412ed8a08acc5f..985c2b3285f9289eeaac43293f85195b5f3d0d5b 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -2175,19 +2175,22 @@ emit_group_load_1 (rtx *tmps, rtx dst, rtx orig_src, tree type, int ssize)
 	{
 	  unsigned int slen = GET_MODE_SIZE (GET_MODE (src));
 	  unsigned int slen0 = GET_MODE_SIZE (GET_MODE (XEXP (src, 0)));
+	  unsigned int elt = bytepos / slen0;
+	  unsigned int subpos = bytepos % slen0;
 
-	  if ((bytepos == 0 && bytelen == slen0)
-	      || (bytepos != 0 && bytepos + bytelen <= slen))
+	  if (subpos + bytelen <= slen0)
 	    {
 	      /* The following assumes that the concatenated objects all
 		 have the same size.  In this case, a simple calculation
 		 can be used to determine the object and the bit field
 		 to be extracted.  */
-	      tmps[i] = XEXP (src, bytepos / slen0);
-	      if (! CONSTANT_P (tmps[i])
-		  && (!REG_P (tmps[i]) || GET_MODE (tmps[i]) != mode))
+	      tmps[i] = XEXP (src, elt);
+	      if (subpos != 0
+		  || subpos + bytelen != slen0
+		  || (!CONSTANT_P (tmps[i])
+		      && (!REG_P (tmps[i]) || GET_MODE (tmps[i]) != mode)))
 		tmps[i] = extract_bit_field (tmps[i], bytelen * BITS_PER_UNIT,
-					     (bytepos % slen0) * BITS_PER_UNIT,
+					     subpos * BITS_PER_UNIT,
 					     1, NULL_RTX, mode, mode, false);
 	    }
 	  else