(store_split_bit_field): For BYTES_BIG_ENDIAN, only

pad on left if value not in memory.

From-SVN: r6429

gcc/expmed.c

@@ -721,11 +721,19 @@ store_split_bit_field (op0, bitsize, bitpos, value, align)
 			 >> (bitsize - bitsdone - thissize))
 			& (((HOST_WIDE_INT) 1 << thissize) - 1));
       else
-	/* The args are chosen so that the last part
-	   includes the lsb.  */
-	part = extract_fixed_bit_field (word_mode, value, 0, thissize,
-					BITS_PER_WORD - bitsize + bitsdone,
-					NULL_RTX, 1, align);
+	{
+	  /* The args are chosen so that the last part
+	     includes the lsb.  */
+	  int bit_offset = 0;
+	  /* If the value isn't in memory, then it must be right aligned
+	     if a register, so skip past the padding on the left.  If it
+	     is in memory, then there is no padding on the left.  */
+	  if (GET_CODE (value) != MEM)
+	    bit_offset = BITS_PER_WORD - bitsize;
+	  part = extract_fixed_bit_field (word_mode, value, 0, thissize,
+					  bit_offset + bitsdone,
+					  NULL_RTX, 1, align);
+	}
 #else
       /* Fetch successively more significant portions.  */
       if (GET_CODE (value) == CONST_INT)