target-ppc: improve stxvw4x implementation
Manipulate data and store 8bytes instead of 4bytes.
Vector (32-bit elements):
+----------+----------+----------+----------+
|
00112233 |
44556677 |
8899AABB |
CCDDEEFF |
+----------+----------+----------+----------+
Store results in following:
Big-Endian Storage
+-------------+-------------+-------------+-------------+
| 00 11 22 33 | 44 55 66 77 | 88 99 AA BB | CC DD EE FF |
+-------------+-------------+-------------+-------------+
Little-Endian Storage
+-------------+-------------+-------------+-------------+
| 33 22 11 00 | 77 66 55 44 | BB AA 99 88 | FF EE DD CC |
+-------------+-------------+-------------+-------------+
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>