diff -up ../_clean/gcc/expmed.c gcc/expmed.c
--- ../_clean/gcc/expmed.c	2011-12-09 15:20:36.000000000 +0100
+++ gcc/expmed.c	2011-12-09 15:23:01.000000000 +0100
@@ -543,7 +543,8 @@ store_bit_field_1 (rtx str_rtx, unsigned
 	 is not allowed.  */
       fieldmode = GET_MODE (value);
       if (fieldmode == VOIDmode)
-	fieldmode = smallest_mode_for_size (nwords * BITS_PER_WORD, MODE_INT);
+	fieldmode = smallest_mode_for_size (nwords *
+					    BITS_PER_WORD, MODE_INT);
 
       last = get_last_insn ();
       for (i = 0; i < nwords; i++)
@@ -557,9 +558,21 @@ store_bit_field_1 (rtx str_rtx, unsigned
 					    0)
 				     : (int) i * BITS_PER_WORD);
 	  rtx value_word = operand_subword_force (value, wordnum, fieldmode);
+	  unsigned HOST_WIDE_INT new_bitsize =
+	    MIN (BITS_PER_WORD, bitsize - i * BITS_PER_WORD);
 
-	  if (!store_bit_field_1 (op0, MIN (BITS_PER_WORD,
-					    bitsize - i * BITS_PER_WORD),
+	  /* If the remaining chunk doesn't have full wordsize we have
+	     to make sure that for big endian machines the higher order
+	     bits are used.  */
+	  if (new_bitsize < BITS_PER_WORD && BYTES_BIG_ENDIAN && !backwards)
+	    value_word = simplify_expand_binop (word_mode, lshr_optab,
+						value_word,
+						GEN_INT (BITS_PER_WORD
+							 - new_bitsize),
+						NULL_RTX, true,
+						OPTAB_LIB_WIDEN);
+
+	  if (!store_bit_field_1 (op0, new_bitsize,
 				  bitnum + bit_offset,
 				  bitregion_start, bitregion_end,
 				  word_mode,
--- ../_clean/gcc/optabs.c	2011-12-23 23:39:30.000000000 +0100
+++ gcc/optabs.c	2011-12-24 18:40:01.000000000 +0100
@@ -659,7 +659,7 @@ expand_ternary_op (enum machine_mode mod
    calculated at compile time.  The arguments and return value are
    otherwise the same as for expand_binop.  */
 
-static rtx
+rtx
 simplify_expand_binop (enum machine_mode mode, optab binoptab,
 		       rtx op0, rtx op1, rtx target, int unsignedp,
 		       enum optab_methods methods)
diff -up ../_clean/gcc/optabs.h gcc/optabs.h
--- ../_clean/gcc/optabs.h	2011-12-23 23:39:30.000000000 +0100
+++ gcc/optabs.h	2011-12-24 18:40:01.000000000 +0100
@@ -859,6 +859,10 @@ extern rtx expand_ternary_op (enum machi
 extern rtx expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
 			 enum optab_methods);
 
+extern rtx simplify_expand_binop (enum machine_mode mode, optab binoptab,
+				  rtx op0, rtx op1, rtx target, int unsignedp,
+				  enum optab_methods methods);
+
 extern bool force_expand_binop (enum machine_mode, optab, rtx, rtx, rtx, int,
 				enum optab_methods);