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authorjofret2009-04-28 07:17:00 +0000
committerjofret2009-04-28 07:17:00 +0000
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Moving lapack to right place
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- LOGICAL FUNCTION DLAISNAN(DIN1,DIN2)
-*
-* -- LAPACK auxiliary routine (version 3.1) --
-* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
-* November 2006
-*
-* .. Scalar Arguments ..
- DOUBLE PRECISION DIN1,DIN2
-* ..
-*
-* Purpose
-* =======
-*
-* This routine is not for general use. It exists solely to avoid
-* over-optimization in DISNAN.
-*
-* DLAISNAN checks for NaNs by comparing its two arguments for
-* inequality. NaN is the only floating-point value where NaN != NaN
-* returns .TRUE. To check for NaNs, pass the same variable as both
-* arguments.
-*
-* Strictly speaking, Fortran does not allow aliasing of function
-* arguments. So a compiler must assume that the two arguments are
-* not the same variable, and the test will not be optimized away.
-* Interprocedural or whole-program optimization may delete this
-* test. The ISNAN functions will be replaced by the correct
-* Fortran 03 intrinsic once the intrinsic is widely available.
-*
-* Arguments
-* =========
-*
-* DIN1 (input) DOUBLE PRECISION
-* DIN2 (input) DOUBLE PRECISION
-* Two numbers to compare for inequality.
-*
-* =====================================================================
-*
-* .. Executable Statements ..
- DLAISNAN = (DIN1.NE.DIN2)
- RETURN
- END