1.3.3 Quad-Precision Functions (Sun Studio 12: Fortran Library Reference)

Sun Studio 12: Fortran Library Reference

1.3.3 Quad-Precision Functions

These subprograms are quadruple-precision (REAL*16) math functions and subroutines.

In general, these do not correspond to standard generic intrinsic functions; data types are determined by the usual data typing rules.

The quadruple precision functions must appear in a REAL*16 statement

Table 1–4 Quadruple-Precision libm Functions


Function Name	Return Type
`q_copysign``( x, y )` `q_fabs``( x )` `q_fmod``( x )` `q_infinity``( )`	*`REAL16` `REAL16`* *`REAL16` `REAL16`*
`iq_finite``( x )` `iq_fp_class``( x )` `iq_ilogb``( x )` `iq_isinf``( x )` `iq_isnan``( x )` `iq_isnormal``( x )` `iq_issubnormal``( x )` `iq_iszero``( x )` `iq_signbit``( x )`	`INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER`
`q_max_normal``()` `q_max_subnormal``()` `q_min_normal``()` `q_min_subnormal``()` `q_nextafter``( x, y )` `q_quiet_nan``( n )` `q_remainder``( x, y )` `q_scalbn``( x, n )` `q_signaling_nan``( n )`	*`REAL16` `REAL16`* *`REAL16` `REAL16`* *`REAL16` `REAL16`* *`REAL16` `REAL16`* *`REAL16`**

The variables c, l, p, s, u, x, and y are of type quadruple precision. Variable n is of type INTEGER.
Explicitly type these functions with a REAL*16 statement or with an appropriate IMPLICIT statement.
sind(x), asind(x), … take degrees rather than radians.

If you need to use any other quadruple-precision libm function, you can call it using $PRAGMA C(fcn) before the call. For details, see the chapter on the C–Fortran interface in the Fortran Programming Guide.