Describes implementation-defined aspects of the ARM C compiler and C library relating to floating-point operations, as required by the ISO C standard.
Floating-point quantities are stored in IEEE format:
floatvalues are represented by IEEE single-precision values
doublevalues are represented by IEEE double-precision values.
long double quantities
the word containing the sign, the exponent, and the most significant
part of the mantissa is stored with the lower machine address in
big-endian mode and at the higher address in little-endian mode.