[cpp-threads] Brief example ITANIUM Implementation for C/C++ Memory Model

[Alexander Terekhov]

Following the lead of

http://www.rdrop.com/users/paulmck/scalability/paper/N2745r.2008.12.16a.html
(cmpxchg aside for a moment aside, "Store Seq Cst" is surely busted)

here's a brief example ITANIUM implementation for C/C++ Memory Model:

(cmpxchg aside for a moment)

Load Relaxed:  ld
Load Consume:  ld
Load Acquire:  ld.acq
Load Seq_Cst:  mf,ld.acq
Store Relaxed: st
Store Release: st.rel
Store Seq Cst: st.rel,mf
Consume Fence: <ignore>
Acquire Fence: mf
Release Fence: mf
Acq_Rel Fence: mf
Seq_Cst Fence: mf

Any objections and/or questions?

TIA.

regards,
alexander.