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46 lines
1.4 KiB
46 lines
1.4 KiB
#include "clapack.h" |
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logical slaisnan_(real *sin1, real *sin2) |
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{ |
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/* System generated locals */ |
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logical ret_val; |
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/* -- LAPACK auxiliary routine (version 3.1) -- */ |
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/* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. */ |
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/* November 2006 */ |
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/* .. Scalar Arguments .. */ |
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/* .. */ |
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/* Purpose */ |
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/* ======= */ |
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/* This routine is not for general use. It exists solely to avoid */ |
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/* over-optimization in SISNAN. */ |
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/* SLAISNAN checks for NaNs by comparing its two arguments for */ |
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/* inequality. NaN is the only floating-point value where NaN != NaN */ |
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/* returns .TRUE. To check for NaNs, pass the same variable as both */ |
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/* arguments. */ |
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/* Strictly speaking, Fortran does not allow aliasing of function */ |
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/* arguments. So a compiler must assume that the two arguments are */ |
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/* not the same variable, and the test will not be optimized away. */ |
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/* Interprocedural or whole-program optimization may delete this */ |
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/* test. The ISNAN functions will be replaced by the correct */ |
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/* Fortran 03 intrinsic once the intrinsic is widely available. */ |
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/* Arguments */ |
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/* ========= */ |
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/* SIN1 (input) REAL */ |
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/* SIN2 (input) REAL */ |
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/* Two numbers to compare for inequality. */ |
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/* ===================================================================== */ |
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/* .. Executable Statements .. */ |
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ret_val = *sin1 != *sin2; |
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return ret_val; |
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} /* slaisnan_ */
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