__softfp keyword asserts that a function uses software floating-point linkage. It is implicitly added to functions when softfp linkage is used.
__softfp is a function qualifier. It affects the type of the function.
This keyword has the
Calls to the function pass floating-point arguments in integer registers. If the result is a floating-point value, the value is returned in integer registers. This duplicates the behavior of compilation targeting software floating-point.
This keyword enables the same library to be used by sources compiled to use hardware and software floating-point.
In C++, if a virtual function qualified with the
__softfp keyword is to
be overridden, the overriding function must also be declared as
If the functions do not match, the compiler generates an error.