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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:

  • float values are represented by IEEE single-precision values

  • double and long double values are represented by IEEE double-precision values.

For double and 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.