gcc/testsuite/gfortran.dg/bessel_7.f90

   1 ! { dg-do run }
   2 !
   3 ! PR fortran/36158
   4 ! PR fortran/33197
   5 !
   6 ! Run-time tests for transformations BESSEL_YN
   7 !
   8 implicit none
   9 real,parameter :: values(*) = [0.0, 0.5, 1.0, 0.9, 1.8,2.0,3.0,4.0,4.25,8.0,34.53, 475.78]
  10 real,parameter :: myeps(size(values)) = epsilon(0.0) &
  11                   * [2, 3, 4, 5, 8, 2, 12, 6, 7, 6, 30, 168 ]
  12 ! The following is sufficient for me - the values above are a bit
  13 ! more tolerant
  14 !                  * [0, 0, 0, 3, 3, 0, 9, 0, 2, 1, 22, 130 ]
  15 integer,parameter :: nit(size(values)) =  &
  16                  [100, 100, 100, 25, 15, 100, 10, 31, 7, 100, 7, 25 ]
  17 integer, parameter :: Nmax = 100
  18 real :: rec(0:Nmax), lib(0:Nmax)
  19 integer :: i
  20
  21 do i = 1, ubound(values,dim=1)
  22   call compare(values(i), myeps(i), nit(i), 6*epsilon(0.0))
  23 end do
  24
  25 contains
  26
  27 subroutine compare(X, myeps, nit, myeps2)
  28
  29 integer :: i, nit
  30 real X, myeps, myeps2
  31
  32 rec = BESSEL_YN(0, Nmax, X)
  33 lib = [ (BESSEL_YN(i, X), i=0,Nmax) ]
  34
  35 !print *, 'YN for X = ', X, ' -- Epsilon = ',epsilon(x)
  36 do i = 0, Nmax
  37 !  print '(i2,2e17.9,e12.2,f14.10,2l3)', i, rec(i), lib(i), &
  38 !        rec(i)-lib(i), ((rec(i)-lib(i))/rec(i))/epsilon(x), &
  39 !        i > nit .or. rec(i) == lib(i) &
  40 !                .or. abs((rec(i)-lib(i))/rec(i)) < myeps2, &
  41 !        rec(i) == lib(i) .or. abs((rec(i)-lib(i))/rec(i)) < myeps
  42 if (.not. (i > nit .or. rec(i) == lib(i) &
  43                    .or. abs((rec(i)-lib(i))/rec(i)) < myeps2)) &
  44   call abort ()
  45 if (.not. (rec(i) == lib(i) .or. abs((rec(i)-lib(i))/rec(i)) < myeps)) &
  46   call abort ()
  47 end do
  48
  49 end
  50 end