Errors defined for ASIN function?

[ereisch]

Are there any runtime errors defined for the ASIN function, other than the obvious domain error of ABS(A) > 1.0?  I'm getting an underflow error when I perform ASIN(4.15e-5), which should be entirely valid as the result is only 2.38e-3 (well within the bounds of REAL*4).  Input and output data types are both REAL*4.

[ereisch]

Correction: Result is 4.15e-5, not 2.38e-3.  Still well within the capabilities of single precision though.

[mecej4]

Please report the problem with sufficient detail that will allow it to be reproduced, as recommended.

Here is a counter-example:

program xasin
implicit none
real :: x = 4.15e-5
!
print *,asin(x)
end program

Compiled using Ifort 19.1U3 on Windows, this program prints out:

  4.1499999E-05

[ereisch]

If you build the program to not mask underflow exceptions (which is not the default) and prevent flush-to-zero, it should throw an exception. I can't remember what those flags are offhand (the latter is -no-ftz IIRC).