1! { dg-do run }
2! Check the fix for PR28005, in which the mechanism for dealing
3! with matmul (transpose (a), b) would cause wrong results for
4! matmul (a(i, 1:n), b(1:n, 1:n)).
5!
6! Based on the original testcase contributed by
7! Tobias Burnus  <tobias.burnus@physik.fu-berlin.de>
8!
9   implicit none
10   integer, parameter         ::  nmax = 3
11   integer                    ::  i, n = 2
12   integer, dimension(nmax,nmax) ::  iB=0 , iC=1
13   integer, dimension(nmax,nmax) ::  iX1=99, iX2=99, iChk
14   iChk = reshape((/30,66,102,36,81,126,42,96,150/),(/3,3/))
15
16! This would give 3, 3, 99
17   iB = reshape((/1 ,3 ,0 ,2 ,5 ,0 ,0 ,0 ,0 /),(/3,3/))
18   iX1(1:n,1) = matmul( iB(2,1:n),iC(1:n,1:n) )
19
20! This would give 4, 4, 99
21   ib(3,1) = 1
22   iX2(1:n,1) = matmul( iB(2,1:n),iC(1:n,1:n) )
23
24! Whereas, we should have 8, 8, 99
25   if (any (iX1(1:n,1) .ne. (/8, 8, 99/))) call abort ()
26   if (any (iX1 .ne. iX2)) call abort ()
27
28! Make sure that the fix does not break transpose temporaries.
29   iB = reshape((/(i, i = 1, 9)/),(/3,3/))
30   ic = transpose (iB)
31   iX1 = transpose (iB)
32   iX1 = matmul (iX1, iC)
33   iX2 = matmul (transpose (iB), iC)
34   if (any (iX1 .ne. iX2)) call abort ()
35   if (any (iX1 .ne. iChk)) call abort ()
36end
37