- If z is 0, one of x or y is 0, and the other is infinite, raise   an invalid exception and return an NaN. - If a long double has 113 bits of precision, implement fma in terms   of simple long double arithmetic instead of complicated double arithmetic. - If a long double is the same as a double, alias fma as fmal.
- If z is 0, one of x or y is 0, and the other is infinite, raise
  an invalid exception and return an NaN.
- If a long double has 113 bits of precision, implement fma in terms
  of simple long double arithmetic instead of complicated double arithmetic.
- If a long double is the same as a double, alias fma as fmal.

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