Looking at memset's implementation on November 28, 2010 assembly mac os x +0 x86_64 assembly mac os x x86_64
Calling _printf from 64bit code under Mac OS X on November 23, 2010 assembly mac os x +0 x86_64 assembly mac os x x86_64
Hello world in 64bit, Mac OS X on November 18, 2010 assembly mac os x +0 x86_64 assembly mac os x x86_64