Library /sys$common/syshlp/helplib.hlb  —  CRTL  exp2  Return Values
    n                  2**x.
    HUGE_VAL           Overflow occurred; errno is set to ERANGE.
    1                  x is +0 or -0; errno is set to ERANGE.
    0                  x is -Inf or underflow occurred; errno is set
                       to ERANGE.
    x                  x is +Inf; errno is set to ERANGE.
    NaN                x is NaN; errno is set to EDOM.
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