On a Compaq Alpha (Tru64 Unix, 4.0F), the following code (from test_descr.py) produces unaligned access warnings when run: class L(long): pass coerce(L(0), 0) coerce(L(0), 0L) coerce(0, L(0)) coerce(0L, L(0)) Unaligned access pid=5070 <python> va=0x1400c9266 pc=0x120031228 ra=0x120031218 inst=0xa6000000 Unaligned access pid=5070 <python> va=0x1400d9086 pc=0x120031228 ra=0x120031218 inst=0xa6000000 Unaligned access pid=5070 <python> va=0x1400c9266 pc=0x120031228 ra=0x120031218 inst=0xa6000000 Unaligned access pid=5070 <python> va=0x1400c9266 pc=0x120031228 ra=0x120031218 inst=0xa6000000 I'll try to chase this further, but work is a bit fraught at the moment... If you want me to log it as a bug, let me know. -- Mark Favas - m.favas@per.dem.csiro.au CSIRO, Private Bag No 5, Wembley, Western Australia 6913, AUSTRALIA