47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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#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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