Topic       : C-Language Documentation
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Subject     : Documentation/C-Language
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View Ref-File[ Storage Classes: register ]

Use registers D0-D5 for data (char, short, int and long)
registers A0-A4 for pointers and FPU registers FP0-FP5 for double or
float (when available).

When these registers are used up, revert to auto storage class (store
on stack).

Pure C passes function parameters as register variables.  (See cdecl).

Register variables are primarily used with non-optimizing compilers
for greater speed.  With Pure C, register variables are not needed.

Note: Registers D0-D2, A0-A2, and FP0-FP2 (when used) will be saved to
      the stack whenever a function is called.