35 lines
643 B
Fortran
35 lines
643 B
Fortran
! { dg-do run }
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! { dg-options "-O2" }
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program m
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double precision :: y,z
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call b(1.0d0,y,z)
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if (ABS (z - 1.213) > 0.1) call abort
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contains
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subroutine b( x, y, z)
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implicit none
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double precision :: x,y,z
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integer :: i, k
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double precision :: h, r
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y = 1.0d0
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z = 0.0d0
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h = 0
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DO k = 1,10
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h = h + 1.0d0/k
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r = 1
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DO i = 1,k
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r = (x/(2*i) ) * r
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END DO
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y = y + (-1)**k * r
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z = z + (-1)**(k+1) * h * r
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IF ( ABS(2*k/x*r) < 1d-6 ) EXIT
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END DO
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z = 2*y
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end subroutine b
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end program m
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