64 bit porting guide

Hello, I am porting my application from 32bit to 64bit architecture on intel. Can anyone point me to some good references for 64bit porting on intel platform(32bit i686 to 64bit x86_64) Thanks, manju

built-in atomic functions

Hello, Are there any new built-in implementations equivalent to atomic_read and atomic_write in latest releases ? if not should I rely on trick suggested in one of the earlier discussions as below ? ">>We don't have atomic read or atomic write builtins (ok, you could >>abuse __sync_fetch_and