* \fn fixed fixsub (fixed x, fixed y) * \brief Subtract a fixed point value from another. * * This function subtracts the fixed point values \a y from the fixed * point value \a x, and returns the difference. * * \param x The minuend. * \param y The subtrahend. * * \return The difference. If the result runs out of range of fixed point, * this function sets \a errno to \a ERANGE.
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