gcc/testsuite/gfortran.dg/matmul_1.f90

   1 !{ dg-do run }
   2 ! Test MATMUL for various arguments and results
   3 ! (test values checked with GNU octave).
   4 ! PR18857 was due to an incorrect assertion that component base==0
   5 ! for both input arguments and the result.
   6 ! provided by Paul Thomas - pault@gcc.gnu.org
   7
   8 Program matmul_1
   9   integer, parameter                                :: N = 5
  10   integer, parameter                                :: T = 4
  11   integer                                           :: i
  12   real(kind=T), dimension(:,:), allocatable         :: a, b, c
  13   real(kind=T), dimension(N,N)                      :: x, y, z
  14
  15   allocate (a(2*N, N), b(N, N), c(2*N, N))
  16
  17   do i = 1, 2*N
  18     a(i, :) = real (i)
  19   end do
  20   b = 4.0_T
  21
  22   do i = 1, N
  23     x(i, :) = real (i)
  24   end do
  25   y = 2.0_T
  26
  27 !                           whole array
  28
  29   z = 0.0_T
  30   z = matmul (x, y)
  31   if (sum (z) /= 750.0_T) STOP 1
  32
  33 !                           array sections
  34
  35   c = 0.0_T
  36   c(1:3,1:2) = matmul (a(7:9,3:N), b(3:N,3:4))
  37   if (sum (c) /= 576.0_T) STOP 2
  38
  39 !                           uses a temp
  40
  41   c = 0.0_T
  42   c = matmul (a, b + x)
  43   if (sum (c) /= 9625.0_T) STOP 3
  44
  45 !                           returns to a temp
  46
  47   c = 0.0_T
  48   c = a + matmul (a, b)
  49   if (sum (c) /= 5775.0_T) STOP 4
  50
  51   deallocate (a, b, c)
  52
  53 end program matmul_1