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The issue of store-forwarding stalls was discussed a while back on the list...
By any chance, do you remember what were those discussions? I tried searching the archives for "store forwarding" but couldn't find relevant results. The ones I could find were too old[1] (e.g. 32-bit Pentium 4) or were talking about something else (e.g. store forwarding inside LuaJIT IR).
-- Hugo [1] http://lua-users.org/lists/lua-l/2005-08/msg00462.html