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- The specifiers auto and register are rarely used explicitly. They
- can be applied only to objects declared in a block or to formal
- arguments of functions. To explicitly declare such objects or
- arguments to have auto storage is redundant. The storage class
- register is a hint to the compiler that the object is heavily
- used. Specifying register storage may have no effect, and may, in
- some cases, adversely affect the optimization and portability of
- your code.
-