6.9 Hints

ISO Standard Implementation
“The extent to which suggestions made by using the register storage-class specifier are effective (C90 6.5.1, C99 6.7.1).”
The register storage class can be used to locate certain objects in a register (see Section on Register Usage).
“The extent to which suggestions made by using the inline function specifier are effective (C99 6.7.4).”
A function might be inlined if a licensed compiler has the optimizers set to level 2 or higher. In other situations, the function will not be inlined.