diff options
Diffstat (limited to 'gcc/testsuite/gfortran.dg/random_3.f90')
| -rw-r--r-- | gcc/testsuite/gfortran.dg/random_3.f90 | 36 |
1 files changed, 21 insertions, 15 deletions
diff --git a/gcc/testsuite/gfortran.dg/random_3.f90 b/gcc/testsuite/gfortran.dg/random_3.f90 index 8e087c48267..04910002c1f 100644 --- a/gcc/testsuite/gfortran.dg/random_3.f90 +++ b/gcc/testsuite/gfortran.dg/random_3.f90 @@ -1,10 +1,10 @@ ! { dg-do run } ! { dg-require-effective-target fortran_large_real } -! Check that the random_seed for real(10) or real(16) exists and that -! real(8) and real(10) or real(16) random number generators +! Check that the random_seed for real(10) exists and that +! real(8) and real(10) random number generators ! return the same sequence of values. ! Mostly copied from random_2.f90 -program random_4 +program random_3 integer,parameter :: k = selected_real_kind (precision (0.0_8) + 1) integer, dimension(:), allocatable :: seed @@ -13,17 +13,23 @@ program random_4 real, parameter :: delta = 1.d-10 integer n - call random_seed (size=n) - allocate (seed(n)) - call random_seed (get=seed) - ! Test both array valued and scalar routines. - call random_number(r8) - call random_number (r8(10)) + ! Run the test only if real(10) is available. With the current + ! xorshift1024* PRNG the real(16) generator uses two uint64_t values + ! for every real(16) value generated, and hence the sequences won't + ! be the same as with real(4,8,10). + if (k == 10) then + call random_seed (size=n) + allocate (seed(n)) + call random_seed (get=seed) + ! Test both array valued and scalar routines. + call random_number(r8) + call random_number (r8(10)) - ! Reset the seed and get the real(8) values. - call random_seed (put=seed) - call random_number(r10) - call random_number (r10(10)) + ! Reset the seed and get the real(8) values. + call random_seed (put=seed) + call random_number(r10) + call random_number (r10(10)) - if (any ((r8 - r10) .gt. delta)) call abort -end program random_4 + if (any ((r8 - r10) .gt. delta)) call abort + end if +end program random_3 |