gcc/testsuite/gfortran.dg/bessel_7.f90

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