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Diffstat (limited to 'gcc/testsuite/gfortran.dg/equiv_6.f90')
-rw-r--r-- | gcc/testsuite/gfortran.dg/equiv_6.f90 | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/gcc/testsuite/gfortran.dg/equiv_6.f90 b/gcc/testsuite/gfortran.dg/equiv_6.f90 new file mode 100644 index 000000000..1ab1a0513 --- /dev/null +++ b/gcc/testsuite/gfortran.dg/equiv_6.f90 @@ -0,0 +1,77 @@ +! { dg-do run } +! This checks the patch for PR25395, in which equivalences within one +! segment were broken by indirect equivalences, depending on the +! offset of the variable that bridges the indirect equivalence. +! +! This is a fortran95 version of the original testcase, which was +! contributed by Harald Vogt <harald.vogt@desy.de> +program check_6 + common /abc/ mwkx(80) + common /cde/ lischk(20) + dimension listpr(20),lisbit(10),lispat(8) +! This was badly compiled in the PR: + equivalence (listpr(10),lisbit(1),mwkx(10)), & + (lispat(1),listpr(10)) + lischk = (/0, 0, 0, 0, 0, 0, 0, 0, 0, 1, & + 2, 0, 0, 5, 6, 7, 8, 9,10, 0/) + +! These two calls replace the previously made call to subroutine +! set_arrays which was erroneous because of parameter-induced +! aliasing. + call set_array_listpr (listpr) + call set_array_lisbit (lisbit) + + if (any (listpr.ne.lischk)) call abort () + call sub1 + call sub2 + call sub3 +end +subroutine sub1 + common /abc/ mwkx(80) + common /cde/ lischk(20) + dimension listpr(20),lisbit(10),lispat(8) +! This workaround was OK + equivalence (listpr(10),lisbit(1)), & + (listpr(10),mwkx(10)), & + (listpr(10),lispat(1)) + call set_array_listpr (listpr) + call set_array_lisbit (lisbit) + if (any (listpr .ne. lischk)) call abort () +end +! +! Equivalences not in COMMON +!___________________________ +! This gave incorrect results for the same reason as in MAIN. +subroutine sub2 + dimension mwkx(80) + common /cde/ lischk(20) + dimension listpr(20),lisbit(10),lispat(8) + equivalence (lispat(1),listpr(10)), & + (mwkx(10),lisbit(1),listpr(10)) + call set_array_listpr (listpr) + call set_array_lisbit (lisbit) + if (any (listpr .ne. lischk)) call abort () +end +! This gave correct results because the order in which the +! equivalences are taken is different and was given in the PR. +subroutine sub3 + dimension mwkx(80) + common /cde/ lischk(20) + dimension listpr(20),lisbit(10),lispat(8) + equivalence (listpr(10),lisbit(1),mwkx(10)), & + (lispat(1),listpr(10)) + call set_array_listpr (listpr) + call set_array_lisbit (lisbit) + if (any (listpr .ne. lischk)) call abort () +end + +subroutine set_array_listpr (listpr) + dimension listpr(20) + listpr = 0 +end + +subroutine set_array_lisbit (lisbit) + dimension lisbit(10) + lisbit = (/(i, i = 1, 10)/) + lisbit((/3,4/)) = 0 +end |