laisnan - laisnan: test for NaN, unoptimized

Generated automatically by Doxygen for LAPACK from the source code. Version 3.12.0 Thu Aug 7 2025 17:26:25 laisnan(3)

logicalfunctiondlaisnan(doubleprecision,intent(in)din1,doubleprecision,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. ParametersDIN1 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. logicalfunctionslaisnan(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. ParametersSIN1 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.

laisnan - laisnan: test for NaN, unoptimized

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.