Revert regression causing changes to store_bit_field_1.

	Revert
	2011-11-16  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>

	PR middle-end/50325
	* expmed.c (store_bit_field_1): Use extract_bit_field on big
	endian targets if the source cannot be exactly covered by word
	mode chunks.

From-SVN: r181598

gcc/ChangeLog

+2011-11-21  David S. Miller  <davem@davemloft.net>
+
+	Revert
+	2011-11-16  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
+
+	PR middle-end/50325
+	* expmed.c (store_bit_field_1): Use extract_bit_field on big
+	endian targets if the source cannot be exactly covered by word
+	mode chunks.
+
 2011-11-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR debug/50827

gcc/expmed.c

@@ -557,18 +557,9 @@ store_bit_field_1 (rtx str_rtx, unsigned HOST_WIDE_INT bitsize,
 					    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 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)
-	    value_word = extract_bit_field (value_word, new_bitsize, 0,
-					    true, false, NULL_RTX,
-					    BLKmode, word_mode);
-
-	  if (!store_bit_field_1 (op0, new_bitsize,
+
+	  if (!store_bit_field_1 (op0, MIN (BITS_PER_WORD,
+					    bitsize - i * BITS_PER_WORD),
 				  bitnum + bit_offset,
 				  bitregion_start, bitregion_end,
 				  word_mode,