---
name: "ieeeck"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/ieeeck/3lapack"
---

# ieeeck(3lapack)

is called from the ILAENV to verify that Infinity and possibly NaN arithmetic is safe (i.e

## NAME

IEEECK - is called from the ILAENV to verify that Infinity and possibly NaN arithmetic is safe (i.e

## SYNOPSIS

- INTEGER FUNCTION

  IEEECK( ISPEC, ZERO, ONE )

- INTEGER

  ISPEC

- REAL

  ONE, ZERO

## PURPOSE

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

## ARGUMENTS

- ISPEC (input) INTEGER

  Specifies whether to test just for inifinity arithmetic or whether to test for infinity and NaN arithmetic. = 0: Verify infinity arithmetic only.\
   \= 1: Verify infinity and NaN arithmetic.

- ZERO (input) REAL

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

- ONE (input) 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 Return if we were only asked to check infinity arithmetic