Hello Computing Performance,
Ran into this deck recently, and although it is a bit dated, it has
nice benchmarks and micro-benchmarks comparing 32bit and 64bit x86
architecture performance.
http://www.amd64.org/fileadmin/user_upload/pub/64bit_Linux-Myths_and_Facts.pdf
Slide 11 has a nice acknowledgement of SUSE's work on GCC enablement
(remember, this is 2008) that I am sure will be appreciated by several
of you on the list :)
Best -Federico