DLAISNAN - Online Linux Manual PageSection : 1
Updated : November 2008
Source : LAPACK auxiliary routine (version 3.2)
Note : LAPACK auxiliary routine (version 3.2)

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NAMEDLAISNAN - routine i not for general use

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SYNOPSISLOGICAL FUNCTION  DLAISNAN(DIN1,DIN2)  DOUBLE PRECISION DIN1,DIN2

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PURPOSEThis 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.
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.

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ARGUMENTSDIN1 (input) DOUBLE PRECISION  DIN2 (input) DOUBLE PRECISION Two numbers to compare for inequality. 0

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