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! { dg-do run }
! PR fortran/49010
! MOD/MODULO sign of zero.
! We wish to provide the following guarantees:
! MOD(A, P): The result has the sign of A and a magnitude less than
! that of P.
! MODULO(A, P): The result has the sign of P and a magnitude less than
! that of P.
! Here we test only with constant arguments (evaluated with
! mpfr_fmod), as we don't want to cause failures on targets with a
! crappy libm. But, a target where fmod follows C99 Annex F is
! fine. Also, targets where GCC inline expands fmod (such as x86(-64))
! are also fine.
program mod_sign0_1
implicit none
real :: r, t
r = mod (4., 2.)
t = sign (1., r)
if (t < 0.) STOP 1
r = modulo (4., 2.)
t = sign (1., r)
if (t < 0.) STOP 2
r = mod (-4., 2.)
t = sign (1., r)
if (t > 0.) STOP 3
r = modulo (-4., 2.)
t = sign (1., r)
if (t < 0.) STOP 4
r = mod (4., -2.)
t = sign (1., r)
if (t < 0.) STOP 5
r = modulo (4., -2.)
t = sign (1., r)
if (t > 0.) STOP 6
r = mod (-4., -2.)
t = sign (1., r)
if (t > 0.) STOP 7
r = modulo (-4., -2.)
t = sign (1., r)
if (t > 0.) STOP 8
end program mod_sign0_1
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