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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _cabs function calculates the absolute value of a complex
     number, which must be a structure of type _complex (or _complexl).
     The structure <z> is composed of a real component <x> and an
     imaginary component <y>. A call to one of the _cabs routines is
     equivalent to the following:
 
          sqrt( z.x * z.x + z.y * z.y )
 
     The _cabsl function uses an 80-bit long double form of arguments
     and return values. In all other respects, it is identical to the
     _cabs function.
 
     Return Value
 
     On overflow, these functions call _matherr (or _matherrl), return
     HUGE_VAL (or _LHUGE_VAL for _cabsl), and set errno to ERANGE.
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