(store_fixed_bit_field): Adjust BITPOS so that it

fits inside MODE before adjusting OFFSET to get an aligned address.

From-SVN: r6658

diff --git a/gcc/expmed.c b/gcc/expmed.c
index b6269c6..5a06dbf 100644 (file)
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -569,6 +569,16 @@ store_fixed_bit_field (op0, offset, bitsize, bitpos, value, struct_align)
 
       total_bits = GET_MODE_BITSIZE (mode);
 
+      /* Make sure bitpos is valid for the chosen mode.  Adjust BITPOS to
+        be be in the range 0 to total_bits-1, and put any excess bytes in
+        OFFSET.  */
+      if (bitpos >= total_bits)
+       {
+         offset += (bitpos / total_bits) * (total_bits / BITS_PER_UNIT);
+         bitpos -= ((bitpos / total_bits) * (total_bits / BITS_PER_UNIT)
+                    * BITS_PER_UNIT);
+       }
+
       /* Get ref to an aligned byte, halfword, or word containing the field.
         Adjust BITPOS to be position within a word,
         and OFFSET to be the offset of that word.