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Defined in rt_fp.h, this function returns
the address of the floating-point status word, which resides by
default in __user_libspace. It is not part of
the C library standard, but is supported by the ARM C library as
an extension.
If __rt_fp_status_addr() is not defined,
the default implementation from the C library is used. The value
is initialized when __rt_lib_init() calls _fp_init().
The constants for the status word are listed in fenv.h.
The default floating-point status is 0.
Using ARM® C and C++ Libraries and Floating-Point Support: