64bit代码移植，推荐
1. What advantages do 64-bit processors have over 32-bit ones? http://www.codeproject.com/Tips/355672/What-advantages-do-64-bit-processors-have-over-32
There are 3 most obvious advantages of 64-bit processors over their 32-bit counterparts: extended address space, capacity increase and bigger number of general-purpose registers.
2. Lessons on development of 64-bit C/C++ applications http://www.viva64.com/en/l/ 详细的课程讲解
3. 20 issues of porting C++ code on the 64-bit platform http://www.codeproject.com/Articles/18855/20-issues-of-porting-C-code-on-the-64-bit-platform
4. Optimization of 64-bit programs http://www.codeproject.com/Articles/33565/Optimization-of-64-bit-programs
另外，还有一篇 AMD64 (EM64T) architecture http://www.codeproject.com/Articles/33704/AMD64-EM64T-architecture