blob: af05574ed3e5e1a8e3a1df9f17988f39ee4c6473 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
! { dg-do run }
! { dg-options "-fno-sign-zero" }
!
! 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
|
