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__thumb: Thumb Function

Thumb coded functions are defined using the __thumb function attribute.

<[>type<]> funcname (<[>args<]>) __thumb

Where:

type is the type of the value returned from the function. If no type is specified, int is assumed.
funcname is the name of the function.
args is the argument list for the function.
__thumb indicates the function is coded with the Thumb instruction set.

For example:

void MyARMfunc (void) __thumb  {    // use Thumb code for following function
  l = x + 4;
}

Note

  • The __thumb attribute switches the CARM Compiler to THUMB mode even if the ARM mode is selected.
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