Manfred Spraul wrote:
Is the Itanium tas implementation correct? I think it should be
xchg4.aqv instead of just xchg4 - as far as I know a normal atomic
exchange is is not a memory barrier on Itanium. At least the Linux
kernel version contains "cmpxchg4.aqv".
Sorry for the noise, I'm wrong:
Itanium automatically uses acquire semantics with xchg.
See top of page 16 on
http://h21007.www2.hp.com/dspp/files/unprotected/itanium/spinlocks.pdf
--
Manfred
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