1 | *> \brief \b SLAISNAN |
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2 | * |
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3 | * =========== DOCUMENTATION =========== |
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4 | * |
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5 | * Online html documentation available at |
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6 | * http://www.netlib.org/lapack/explore-html/ |
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7 | * |
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8 | *> \htmlonly |
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9 | *> Download SLAISNAN + dependencies |
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10 | *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/slaisnan.f"> |
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11 | *> [TGZ]</a> |
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12 | *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/slaisnan.f"> |
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13 | *> [ZIP]</a> |
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14 | *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/slaisnan.f"> |
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15 | *> [TXT]</a> |
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16 | *> \endhtmlonly |
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17 | * |
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18 | * Definition: |
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19 | * =========== |
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20 | * |
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21 | * LOGICAL FUNCTION SLAISNAN( SIN1, SIN2 ) |
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22 | * |
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23 | * .. Scalar Arguments .. |
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24 | * REAL SIN1, SIN2 |
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25 | * .. |
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26 | * |
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27 | * |
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28 | *> \par Purpose: |
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29 | * ============= |
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30 | *> |
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31 | *> \verbatim |
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32 | *> |
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33 | *> This routine is not for general use. It exists solely to avoid |
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34 | *> over-optimization in SISNAN. |
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35 | *> |
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36 | *> SLAISNAN checks for NaNs by comparing its two arguments for |
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37 | *> inequality. NaN is the only floating-point value where NaN != NaN |
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38 | *> returns .TRUE. To check for NaNs, pass the same variable as both |
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39 | *> arguments. |
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40 | *> |
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41 | *> A compiler must assume that the two arguments are |
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42 | *> not the same variable, and the test will not be optimized away. |
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43 | *> Interprocedural or whole-program optimization may delete this |
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44 | *> test. The ISNAN functions will be replaced by the correct |
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45 | *> Fortran 03 intrinsic once the intrinsic is widely available. |
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46 | *> \endverbatim |
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47 | * |
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48 | * Arguments: |
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49 | * ========== |
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50 | * |
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51 | *> \param[in] SIN1 |
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52 | *> \verbatim |
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53 | *> SIN1 is REAL |
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54 | *> \endverbatim |
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55 | *> |
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56 | *> \param[in] SIN2 |
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57 | *> \verbatim |
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58 | *> SIN2 is REAL |
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59 | *> Two numbers to compare for inequality. |
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60 | *> \endverbatim |
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61 | * |
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62 | * Authors: |
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63 | * ======== |
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64 | * |
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65 | *> \author Univ. of Tennessee |
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66 | *> \author Univ. of California Berkeley |
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67 | *> \author Univ. of Colorado Denver |
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68 | *> \author NAG Ltd. |
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69 | * |
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70 | *> \date November 2011 |
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71 | * |
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72 | *> \ingroup auxOTHERauxiliary |
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73 | * |
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74 | * ===================================================================== |
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75 | LOGICAL FUNCTION SLAISNAN( SIN1, SIN2 ) |
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76 | * |
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77 | * -- LAPACK auxiliary routine (version 3.4.0) -- |
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78 | * -- LAPACK is a software package provided by Univ. of Tennessee, -- |
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79 | * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
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80 | * November 2011 |
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81 | * |
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82 | * .. Scalar Arguments .. |
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83 | REAL SIN1, SIN2 |
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84 | * .. |
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85 | * |
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86 | * ===================================================================== |
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87 | * |
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88 | * .. Executable Statements .. |
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89 | SLAISNAN = (SIN1.NE.SIN2) |
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90 | RETURN |
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91 | END |
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