gcc/testsuite/gfortran.dg/matmul_4.f90

   1 ! { dg-do run }
   2 ! Check the fix for PR28947, in which the mechanism for dealing
   3 ! with matmul (a, transpose (b)) would cause wrong results for
   4 ! a having a rank == 1.
   5 !
   6 ! Contributed by Harald Anlauf  <anlauf@gmx.de>
   7 !
   8 program gfcbug40
   9   implicit none
  10
  11   real :: h(3,3), mat(2,3)
  12
  13   h(:,:) = - HUGE (1.0)/4       ! Preset unused elements suitably...
  14
  15   h(3,:) = 0
  16   h(3,3) = 1
  17   mat(:,:) = 1
  18   h(3,:) = h(3,:) + matmul (matmul (h(3,:), transpose (mat)), mat)
  19
  20   if (any (h(3,:) .ne. (/2.0, 2.0, 3.0/))) call abort ()
  21
  22 end program gfcbug40