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! { dg-do run }

!

! PR fortran/40675

!

! Fortran 77 just had: "The value of a signed zero is the same as

! the value of an unsigned zero." and g77 returned for SIGN(1.0, -0.0) = 1.0

!

! Fortran 95+ has for SIGN: "Case  (iv):  If B is of type real and is zero,

! then ... (c) If B is negative real zero, the value of the result is -|A|".

! On architectures, where signed zeros are supported, gfortran's SIGN thus

! returns for B=-0.0 the -|A|.

!

program s

   x = sign(1.,0.)

   y = sign(1.,-0.)

   if (x /=  1.) call abort()

   if (y /= -1.) call abort()

   x = 1.

   y = 0.

   x = sign(x, y)

   y = sign(x, -y)

   if (x /=  1.) call abort()

   if (y /= -1.) call abort()

end program s