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! { dg-do run }

! Check the fix for PR28005, in which the mechanism for dealing

! with matmul (transpose (a), b) would cause wrong results for

! matmul (a(i, 1:n), b(1:n, 1:n)).

!

! Based on the original testcase contributed by

! Tobias Burnus  

!

   implicit none

   integer, parameter         ::  nmax = 3

   integer                    ::  i, n = 2

   integer, dimension(nmax,nmax) ::  iB=0 , iC=1

   integer, dimension(nmax,nmax) ::  iX1=99, iX2=99, iChk

   iChk = reshape((/30,66,102,36,81,126,42,96,150/),(/3,3/))

! This would give 3, 3, 99

   iB = reshape((/1 ,3 ,0 ,2 ,5 ,0 ,0 ,0 ,0 /),(/3,3/))

   iX1(1:n,1) = matmul( iB(2,1:n),iC(1:n,1:n) )

! This would give 4, 4, 99

   ib(3,1) = 1

   iX2(1:n,1) = matmul( iB(2,1:n),iC(1:n,1:n) )

! Whereas, we should have 8, 8, 99

   if (any (iX1(1:n,1) .ne. (/8, 8, 99/))) call abort ()

   if (any (iX1 .ne. iX2)) call abort ()

! Make sure that the fix does not break transpose temporaries.

   iB = reshape((/(i, i = 1, 9)/),(/3,3/))

   ic = transpose (iB)

   iX1 = transpose (iB)

   iX1 = matmul (iX1, iC)

   iX2 = matmul (transpose (iB), iC)

   if (any (iX1 .ne. iX2)) call abort ()

   if (any (iX1 .ne. iChk)) call abort ()

end