1IEEECK(1)           LAPACK auxiliary routine (version 3.1)           IEEECK(1)
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NAME

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

10       INTEGER FUNCTION IEEECK( ISPEC, ZERO, ONE )
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12           INTEGER      ISPEC
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14           REAL         ONE, ZERO
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PURPOSE

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

22       ISPEC   (input) INTEGER
23               Specifies  whether  to  test  just  for inifinity arithmetic or
24               whether to test for infinity and NaN arithmetic.  =  0:  Verify
25               infinity arithmetic only.
26               = 1: Verify infinity and NaN arithmetic.
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28       ZERO    (input) REAL
29               Must  contain  the value 0.0 This is passed to prevent the com‐
30               piler from optimizing away this code.
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32       ONE     (input) REAL
33               Must contain the value 1.0 This is passed to prevent  the  com‐
34               piler from optimizing away this code.
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36               RETURN  VALUE:   INTEGER = 0:  Arithmetic failed to produce the
37               correct answers
38               = 1:  Arithmetic produced the correct answers
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42               Return if we were only asked to check infinity arithmetic
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46 LAPACK auxiliary routine (versionNo3v.e1m)ber 2006                       IEEECK(1)