An ia32 LOCK/XADD bug.

[Ulrich Drepper]

amodra@one.net.au writes:

> > 1. How to write a correct exchange_and_add? Is exchange_and_add_1 ok?
> 
> I think you'll need to use "=&r" and "=&m" as output constraints.

No, why?  Without the & the instruction is explained exactly right.

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