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7.10 Hints

Describes implementation-defined aspects of the Arm® C compiler and C library relating to registers, as required by the ISO C standard.

The extent to which suggestions made by using the register storage-class specifier are effective (6.7.1).
The register storage-class specifier is ignored as a means to control how fast the access to an object is. For example, an object might be allocated in register or allocated in memory regardless of whether it is declared with register storage-class.
The extent to which suggestions made by using the inline function specifier are effective (6.7.4).
The inline function specifier is ignored as a means to control how fast the calls to the function are made. For example, a function might be inlined or not regardless of whether it is declared inline.
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