oracular (3) ieeeck.3.gz

NAME

       ieeeck - ieeeck: verify inf and NaN are safe

SYNOPSIS

   Functions
       integer function ieeeck (ispec, zero, one)
           IEEECK

Detailed Description

Function Documentation

   integer function ieeeck (integer ispec, real zero, real one)
       IEEECK

       Purpose:

            IEEECK is called from the ILAENV to verify that Infinity and
            possibly NaN arithmetic is safe (i.e. will not trap).

       Parameters
           ISPEC

                     ISPEC is INTEGER
                     Specifies whether to test just for infinity arithmetic
                     or whether to test for infinity and NaN arithmetic.
                     = 0: Verify infinity arithmetic only.
                     = 1: Verify infinity and NaN arithmetic.

           ZERO

                     ZERO is REAL
                     Must contain the value 0.0
                     This is passed to prevent the compiler from optimizing
                     away this code.

           ONE

                     ONE is REAL
                     Must contain the value 1.0
                     This is passed to prevent the compiler from optimizing
                     away this code.

             RETURN VALUE:  INTEGER
                     = 0:  Arithmetic failed to produce the correct answers
                     = 1:  Arithmetic produced the correct answers

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

Author

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