1IEEECK(1)           LAPACK auxiliary routine (version 3.2)           IEEECK(1)
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NAME

6       IEEECK - is 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

21       ISPEC   (input) INTEGER
22               Specifies  whether  to  test  just  for inifinity arithmetic or
23               whether to test for infinity and NaN arithmetic.  =  0:  Verify
24               infinity arithmetic only.
25               = 1: Verify infinity and NaN arithmetic.
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27       ZERO    (input) REAL
28               Must  contain  the value 0.0 This is passed to prevent the com‐
29               piler from optimizing away this code.
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31       ONE     (input) REAL
32               Must contain the value 1.0 This is passed to prevent  the  com‐
33               piler from optimizing away this code.  RETURN VALUE:  INTEGER =
34               0:  Arithmetic failed to produce the correct answers
35               = 1:  Arithmetic produced the correct answers Return if we were
36               only asked to check infinity arithmetic
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40 LAPACK auxiliary routine (versionNo3v.e2m)ber 2008                       IEEECK(1)