aha! I think.

[Simon Marlow]

On 27 October 2005 09:05, John Meacham wrote:

> but an alignment issue sounds more likely, if we are stradling 4 byte
> boundries with our 8 byte pointers and ints, that could affect things
> very much. it is the number one cause of performance problems
> according to the AMD optimization manual.

AFAIK we never misalign 8-byte things on x86_64.  We align everything to
8 bytes.

Cheers,
	Simon