gcc/testsuite/gfortran.dg/nint_2.f90

   1 ! Test that NINT gives right results even in corner cases
   2 !
   3 ! PR 31202
   4 ! http://gcc.gnu.org/ml/fortran/2005-04/msg00139.html
   5 !
   6 ! { dg-do run }
   7 ! { dg-xfail-run-if "PR 33271, math library bug" { powerpc-ibm-aix powerpc*-*-linux* *-*-mingw* } { "-O0" } { "" } }
   8   real(kind=8) :: a
   9   integer(kind=8) :: i1, i2
  10   real :: b
  11   integer :: j1, j2
  12
  13   a = nearest(0.5_8,-1.0_8)
  14   i2 = nint(nearest(0.5_8,-1.0_8))
  15   i1 = nint(a)
  16   if (i1 /= 0 .or. i2 /= 0) call abort
  17
  18   a = 0.5_8
  19   i2 = nint(0.5_8)
  20   i1 = nint(a)
  21   if (i1 /= 1 .or. i2 /= 1) call abort
  22
  23   a = nearest(0.5_8,1.0_8)
  24   i2 = nint(nearest(0.5_8,1.0_8))
  25   i1 = nint(a)
  26   if (i1 /= 1 .or. i2 /= 1) call abort
  27
  28   b = nearest(0.5,-1.0)
  29   j2 = nint(nearest(0.5,-1.0))
  30   j1 = nint(b)
  31   if (j1 /= 0 .or. j2 /= 0) call abort
  32
  33   b = 0.5
  34   j2 = nint(0.5)
  35   j1 = nint(b)
  36   if (j1 /= 1 .or. j2 /= 1) call abort
  37
  38   b = nearest(0.5,1.0)
  39   j2 = nint(nearest(0.5,1.0))
  40   j1 = nint(b)
  41   if (j1 /= 1 .or. j2 /= 1) call abort
  42
  43   a = 4503599627370497.0_8
  44   i1 = nint(a,kind=8)
  45   i2 = nint(4503599627370497.0_8,kind=8)
  46   if (i1 /= i2 .or. i1 /= 4503599627370497_8) call abort
  47
  48   a = -4503599627370497.0_8
  49   i1 = nint(a,kind=8)
  50   i2 = nint(-4503599627370497.0_8,kind=8)
  51   if (i1 /= i2 .or. i1 /= -4503599627370497_8) call abort
  52   end