gcc/testsuite/gfortran.dg/matmul_6.f90

   1 ! { dg-do run }
   2 ! PR 34566 - logical matmul used to give the wrong result.
   3 ! We check this by running through every permutation in
   4 ! multiplying two 3*3 matrices, and all permutations of multiplying
   5 ! a 3-vector and a 3*3 matrices  and checking against equivalence
   6 ! with integer matrix multiply.
   7 program main
   8   implicit none
   9   integer, parameter :: ki=4
  10   integer, parameter :: dimen=3
  11   integer :: i, j, k
  12   real, dimension(dimen,dimen) :: r1, r2
  13   integer, dimension(dimen,dimen) :: m1, m2
  14   logical(kind=ki), dimension(dimen,dimen) :: l1, l2
  15   logical(kind=ki), dimension(dimen*dimen) :: laux
  16   logical(kind=ki), dimension(dimen) :: lv
  17   integer, dimension(dimen) :: iv
  18
  19   do i=0,2**(dimen*dimen)-1
  20      forall (k=1:dimen*dimen)
  21         laux(k) = btest(i, k-1)
  22      end forall
  23      l1 = reshape(laux,shape(l1))
  24      m1 = ltoi(l1)
  25
  26      ! Check matrix*matrix multiply
  27      do j=0,2**(dimen*dimen)-1
  28         forall (k=1:dimen*dimen)
  29            laux(k) = btest(i, k-1)
  30         end forall
  31         l2 = reshape(laux,shape(l2))
  32         m2 = ltoi(l2)
  33         if (any(matmul(l1,l2) .neqv. (matmul(m1,m2) /= 0))) then
  34           call abort
  35         end if
  36      end do
  37
  38      ! Check vector*matrix and matrix*vector multiply.
  39      do j=0,2**dimen-1
  40         forall (k=1:dimen)
  41            lv(k) = btest(j, k-1)
  42         end forall
  43         iv = ltoi(lv)
  44         if (any(matmul(lv,l1) .neqv. (matmul(iv,m1) /=0))) then
  45           call abort
  46         end if
  47         if (any(matmul(l1,lv) .neqv. (matmul(m1,iv) /= 0))) then
  48           call abort
  49         end if
  50      end do
  51   end do
  52
  53 contains
  54   elemental function ltoi(v)
  55     implicit none
  56     integer :: ltoi
  57     real :: rtoi
  58     logical(kind=4), intent(in) :: v
  59     if (v) then
  60        ltoi = 1
  61     else
  62        ltoi = 0
  63     end if
  64   end function ltoi
  65
  66 end program main