ieeeck

Checks if the infinity and NaN arithmetic is safe. Called by ilaenv.

Syntax

ival = ieeeck( ispec, zero, one )

Include Files

The FORTRAN 77 interfaces are specified in the mkl_lapack.fi include file (to be used in Fortran programs) and in the mkl_lapack.h include file (to be used in C programs).

Description

The function ieeeck is called from ilaenv to verify that infinity and possibly NaN arithmetic is safe, that is, will not trap.

Input Parameters

ispec

INTEGER.

Specifies whether to test just for infinity arithmetic or both for infinity and NaN arithmetic:

If ispec = 0: Verify infinity arithmetic only.

If ispec = 1: Verify infinity and NaN arithmetic.

zero

REAL. Must contain the value 0.0

This is passed to prevent the compiler from optimizing away this code.

one

REAL. Must contain the value 1.0

This is passed to prevent the compiler from optimizing away this code.

Output Parameters

ival

INTEGER.

If ival = 0: Arithmetic failed to produce the correct answers.

If ival = 1: Arithmetic produced the correct answers.