Can registers be stored before jump or branch?

[Jiang Alan]

   I want to write a machine target for GCC. But It requires that all the 
registers GCC alloced in a basic block shall store its content to memory 
before any branch or jump or function call. After the branch etc, the 
memory data shall be reloaded into registers, no necessary the same one as 
before. 

   Can this be implemented using target macros? If it can, what shall I 
write to do such a thing?

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