! Program to test the MATMUL intrinsic
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! Program to test the MATMUL intrinsic
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program intrinsic_matmul
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program intrinsic_matmul
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implicit none
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implicit none
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integer, dimension(2, 3) :: a
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integer, dimension(2, 3) :: a
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integer, dimension(3, 2) :: b
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integer, dimension(3, 2) :: b
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integer, dimension(2) :: x
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integer, dimension(2) :: x
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integer, dimension(3) :: y
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integer, dimension(3) :: y
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integer, dimension(2, 2) :: r
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integer, dimension(2, 2) :: r
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integer, dimension(3) :: v
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integer, dimension(3) :: v
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real, dimension (2,2) :: aa
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real, dimension (2,2) :: aa
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real, dimension (4,2) :: cc
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real, dimension (4,2) :: cc
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a = reshape((/1, 2, 2, 3, 3, 4/), (/2, 3/))
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a = reshape((/1, 2, 2, 3, 3, 4/), (/2, 3/))
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b = reshape((/1, 2, 3, 3, 4, 5/), (/3, 2/))
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b = reshape((/1, 2, 3, 3, 4, 5/), (/3, 2/))
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x = (/1, 2/)
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x = (/1, 2/)
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y = (/1, 2, 3/)
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y = (/1, 2, 3/)
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r = matmul(a, b)
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r = matmul(a, b)
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if (any(r .ne. reshape((/14, 20, 26, 38/), (/2, 2/)))) call abort
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if (any(r .ne. reshape((/14, 20, 26, 38/), (/2, 2/)))) call abort
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v = matmul(x, a)
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v = matmul(x, a)
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if (any(v .ne. (/5, 8, 11/))) call abort
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if (any(v .ne. (/5, 8, 11/))) call abort
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v(1:2) = matmul(a, y)
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v(1:2) = matmul(a, y)
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if (any(v(1:2) .ne. (/14, 20/))) call abort
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if (any(v(1:2) .ne. (/14, 20/))) call abort
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aa = reshape((/ 1.0, 1.0, 0.0, 1.0/), shape(aa))
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aa = reshape((/ 1.0, 1.0, 0.0, 1.0/), shape(aa))
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cc = 42.
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cc = 42.
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cc(1:2,1:2) = matmul(aa, transpose(aa))
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cc(1:2,1:2) = matmul(aa, transpose(aa))
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if (any(cc(1:2,1:2) .ne. reshape((/ 1.0, 1.0, 1.0, 2.0 /), (/2,2/)))) call abort
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if (any(cc(1:2,1:2) .ne. reshape((/ 1.0, 1.0, 1.0, 2.0 /), (/2,2/)))) call abort
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if (any(cc(3:4,1:2) .ne. 42.)) call abort
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if (any(cc(3:4,1:2) .ne. 42.)) call abort
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end program
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end program
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