Man page - ieeeck(3)

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ieeeck(3) LAPACK ieeeck(3)

ieeeck - ieeeck: verify inf and NaN are safe


integer function ieeeck (ispec, zero, one)
IEEECK

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.

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Thu Aug 7 2025 17:26:25 Version 3.12.0