Provided by: liblapack-doc_3.12.0-3build1.1_all
NAME
laisnan - laisnan: test for NaN, unoptimized
SYNOPSIS
Functions logical function dlaisnan (din1, din2) DLAISNAN tests input for NaN by comparing two arguments for inequality. logical function slaisnan (sin1, sin2) SLAISNAN tests input for NaN by comparing two arguments for inequality.
Detailed Description
Function Documentation
logical function dlaisnan (double precision, intent(in) din1, double precision, intent(in) din2) DLAISNAN tests input for NaN by comparing two arguments for inequality. 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. 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. Parameters DIN1 DIN1 is DOUBLE PRECISION DIN2 DIN2 is DOUBLE PRECISION Two numbers to compare for inequality. Author Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd. logical function slaisnan (real, intent(in) sin1, real, intent(in) sin2) SLAISNAN tests input for NaN by comparing two arguments for inequality. Purpose: This routine is not for general use. It exists solely to avoid over-optimization in SISNAN. SLAISNAN 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. Parameters SIN1 SIN1 is REAL SIN2 SIN2 is REAL Two numbers to compare for inequality. Author Univ. of Tennessee Univ. of California Berkeley Univ. of Colorado Denver NAG Ltd.
Author
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