gcc/testsuite/gfortran.dg/bessel_7.f90

   1 ! { dg-do run { xfail *-*-mingw* spu-*-* } }
   2 !
   3 ! PR fortran/36158
   4 ! PR fortran/33197
   5 !
   6 ! For mingw targets this test is disabled as the MS implementation
   7 ! of BESSEL_YN(n,x) has different results.  It returns NAN rather than
   8 ! -INF for "x=0.0" and all "n".
   9 !
  10 ! XFAILed for SPU targets since we don't have an accurate library
  11 ! implementation of the single-precision Bessel functions.
  12 !
  13 ! Run-time tests for transformations BESSEL_YN
  14 !
  15 implicit none
  16 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]
  17 real,parameter :: myeps(size(values)) = epsilon(0.0) &
  18                   * [2, 3, 4, 5, 8, 2, 12, 6, 7, 6, 31, 168 ]
  19 ! The following is sufficient for me - the values above are a bit
  20 ! more tolerant
  21 !                  * [0, 0, 0, 3, 3, 0, 9, 0, 2, 1, 22, 130 ]
  22 integer,parameter :: nit(size(values)) =  &
  23                  [100, 100, 100, 25, 15, 100, 10, 31, 7, 100, 7, 25 ]
  24 integer, parameter :: Nmax = 100
  25 real :: rec(0:Nmax), lib(0:Nmax)
  26 integer :: i
  27
  28 do i = 1, ubound(values,dim=1)
  29   call compare(values(i), myeps(i), nit(i), 6*epsilon(0.0))
  30 end do
  31
  32 contains
  33
  34 subroutine compare(X, myeps, nit, myeps2)
  35
  36 integer :: i, nit
  37 real X, myeps, myeps2
  38
  39 rec = BESSEL_YN(0, Nmax, X)
  40 lib = [ (BESSEL_YN(i, X), i=0,Nmax) ]
  41
  42 !print *, 'YN for X = ', X, ' -- Epsilon = ',epsilon(x)
  43 do i = 0, Nmax
  44 !  print '(i2,2e17.9,e12.2,f14.10,2l3)', i, rec(i), lib(i), &
  45 !        rec(i)-lib(i), ((rec(i)-lib(i))/rec(i))/epsilon(x), &
  46 !        i > nit .or. rec(i) == lib(i) &
  47 !                .or. abs((rec(i)-lib(i))/rec(i)) < myeps2, &
  48 !        rec(i) == lib(i) .or. abs((rec(i)-lib(i))/rec(i)) < myeps
  49 if (.not. (i > nit .or. rec(i) == lib(i) &
  50                    .or. abs((rec(i)-lib(i))/rec(i)) < myeps2)) &
  51   call abort ()
  52 if (.not. (rec(i) == lib(i) .or. abs((rec(i)-lib(i))/rec(i)) < myeps)) &
  53   call abort ()
  54 end do
  55
  56 end
  57 end