37 lines
1.2 KiB
Fortran
37 lines
1.2 KiB
Fortran
! { dg-do run }
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! Check the fix for PR28005, in which the mechanism for dealing
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! with matmul (transpose (a), b) would cause wrong results for
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! matmul (a(i, 1:n), b(1:n, 1:n)).
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!
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! Based on the original testcase contributed by
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! Tobias Burnus <tobias.burnus@physik.fu-berlin.de>
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!
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implicit none
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integer, parameter :: nmax = 3
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integer :: i, n = 2
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integer, dimension(nmax,nmax) :: iB=0 , iC=1
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integer, dimension(nmax,nmax) :: iX1=99, iX2=99, iChk
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iChk = reshape((/30,66,102,36,81,126,42,96,150/),(/3,3/))
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! This would give 3, 3, 99
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iB = reshape((/1 ,3 ,0 ,2 ,5 ,0 ,0 ,0 ,0 /),(/3,3/))
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iX1(1:n,1) = matmul( iB(2,1:n),iC(1:n,1:n) )
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! This would give 4, 4, 99
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ib(3,1) = 1
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iX2(1:n,1) = matmul( iB(2,1:n),iC(1:n,1:n) )
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! Whereas, we should have 8, 8, 99
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if (any (iX1(1:n,1) .ne. (/8, 8, 99/))) call abort ()
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if (any (iX1 .ne. iX2)) call abort ()
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! Make sure that the fix does not break transpose temporaries.
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iB = reshape((/(i, i = 1, 9)/),(/3,3/))
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ic = transpose (iB)
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iX1 = transpose (iB)
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iX1 = matmul (iX1, iC)
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iX2 = matmul (transpose (iB), iC)
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if (any (iX1 .ne. iX2)) call abort ()
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if (any (iX1 .ne. iChk)) call abort ()
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end
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