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jeremybenn |
! { dg-do run }
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! This checks the patch for PR25395, in which equivalences within one
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! segment were broken by indirect equivalences, depending on the
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! offset of the variable that bridges the indirect equivalence.
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!
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! This is a fortran95 version of the original testcase, which was
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! contributed by Harald Vogt
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program check_6
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common /abc/ mwkx(80)
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common /cde/ lischk(20)
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dimension listpr(20),lisbit(10),lispat(8)
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! This was badly compiled in the PR:
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equivalence (listpr(10),lisbit(1),mwkx(10)), &
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(lispat(1),listpr(10))
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lischk = (/0, 0, 0, 0, 0, 0, 0, 0, 0, 1, &
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2, 0, 0, 5, 6, 7, 8, 9,10, 0/)
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call set_arrays (listpr, lisbit)
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if (any (listpr.ne.lischk)) call abort ()
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call sub1
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call sub2
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call sub3
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end
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subroutine sub1
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common /abc/ mwkx(80)
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common /cde/ lischk(20)
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dimension listpr(20),lisbit(10),lispat(8)
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! This workaround was OK
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equivalence (listpr(10),lisbit(1)), &
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(listpr(10),mwkx(10)), &
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(listpr(10),lispat(1))
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call set_arrays (listpr, lisbit)
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if (any (listpr .ne. lischk)) call abort ()
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end
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!
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! Equivalences not in COMMON
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!___________________________
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! This gave incorrect results for the same reason as in MAIN.
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subroutine sub2
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dimension mwkx(80)
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common /cde/ lischk(20)
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dimension listpr(20),lisbit(10),lispat(8)
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equivalence (lispat(1),listpr(10)), &
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(mwkx(10),lisbit(1),listpr(10))
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call set_arrays (listpr, lisbit)
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if (any (listpr .ne. lischk)) call abort ()
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end
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! This gave correct results because the order in which the
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! equivalences are taken is different and was given in the PR.
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subroutine sub3
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dimension mwkx(80)
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common /cde/ lischk(20)
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dimension listpr(20),lisbit(10),lispat(8)
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equivalence (listpr(10),lisbit(1),mwkx(10)), &
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(lispat(1),listpr(10))
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call set_arrays (listpr, lisbit)
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if (any (listpr .ne. lischk)) call abort ()
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end
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subroutine set_arrays (listpr, lisbit)
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dimension listpr(20),lisbit(10)
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listpr = 0
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lisbit = (/(i, i = 1, 10)/)
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lisbit((/3,4/)) = 0
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end
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