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ieeeck(3) LAPACK ieeeck(3)

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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Wed Feb 7 2024 11:30:40 Version 3.12.0