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verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
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1 files changed, 164 insertions, 0 deletions

diff --git a/gcc/testsuite/gfortran.dg/aliasing_array_result_1.f90 b/gcc/testsuite/gfortran.dg/aliasing_array_result_1.f90
new file mode 100644
index 000000000..d8899d2ec
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/aliasing_array_result_1.f90
@@ -0,0 +1,164 @@
+! { dg-do run }
+! Tests the fic for PR44582, where gfortran was found to
+! produce an incorrect result when the result of a function
+! was aliased by a host or use associated variable, to which
+! the function is assigned. In these cases a temporary is
+! required in the function assignments. The check has to be
+! rather restrictive.  Whilst the cases marked below might
+! not need temporaries, the TODOs are going to be tough.
+!
+! Reported by Yin Ma <yin@absoft.com> and
+! elaborated by Tobias Burnus <burnus@gcc.gnu.org>
+!
+module foo
+  INTEGER, PARAMETER :: ONE = 1
+  INTEGER, PARAMETER :: TEN = 10
+  INTEGER, PARAMETER :: FIVE = TEN/2
+  INTEGER, PARAMETER :: TWO = 2
+  integer :: foo_a(ONE)
+  integer :: check(ONE) = TEN
+  LOGICAL :: abort_flag = .false. 
+contains
+  function foo_f()
+     integer :: foo_f(ONE)
+     foo_f = -FIVE
+     foo_f = foo_a - foo_f
+  end function foo_f
+  subroutine bar
+    foo_a = FIVE
+! This aliases 'foo_a' by host association.
+    foo_a = foo_f ()
+    if (any (foo_a .ne. check)) call myabort (0)
+  end subroutine bar
+  subroutine myabort(fl)
+    integer :: fl
+    print *, fl
+    abort_flag = .true.
+  end subroutine myabort
+end module foo
+
+function h_ext()
+  use foo
+  integer :: h_ext(ONE)
+  h_ext = -FIVE
+  h_ext = FIVE - h_ext
+end function h_ext
+
+function i_ext() result (h)
+  use foo
+  integer :: h(ONE)
+  h = -FIVE
+  h = FIVE - h
+end function i_ext
+
+subroutine tobias
+  use foo
+  integer :: a(ONE)
+  a = FIVE
+  call sub1(a)
+  if (any (a .ne. check)) call myabort (1)
+contains
+  subroutine sub1(x)
+    integer :: x(ONE)
+! 'x' is aliased by host association in 'f'.
+    x = f()
+  end subroutine sub1
+  function f()
+    integer :: f(ONE)
+    f = ONE
+    f = a + FIVE
+  end function f
+end subroutine tobias
+
+program test
+  use foo
+  implicit none
+  common /foo_bar/ c
+  integer :: a(ONE), b(ONE), c(ONE), d(ONE)
+  interface
+    function h_ext()
+      use foo
+      integer :: h_ext(ONE)
+    end function h_ext
+  end interface
+  interface
+    function i_ext() result (h)
+      use foo
+      integer :: h(ONE)
+    end function i_ext
+  end interface
+
+  a = FIVE
+! This aliases 'a' by host association
+  a = f()
+  if (any (a .ne. check)) call myabort (2)
+  a = FIVE
+  if (any (f() .ne. check)) call myabort (3)
+  call bar
+  foo_a = FIVE
+! This aliases 'foo_a' by host association.
+  foo_a = g ()
+  if (any (foo_a .ne. check)) call myabort (4)
+  a = FIVE
+  a = h()           ! TODO: Needs no temporary
+  if (any (a .ne. check)) call myabort (5)
+  a = FIVE
+  a = i()           ! TODO: Needs no temporary
+  if (any (a .ne. check)) call myabort (6)
+  a = FIVE
+  a = h_ext()       ! Needs no temporary - was OK
+  if (any (a .ne. check)) call myabort (15)
+  a = FIVE
+  a = i_ext()       ! Needs no temporary - was OK
+  if (any (a .ne. check)) call myabort (16)
+  c = FIVE
+! This aliases 'c' through the common block.
+  c = j()
+  if (any (c .ne. check)) call myabort (7)
+  call aaa
+  call tobias
+  if (abort_flag) call abort
+contains
+  function f()
+     integer :: f(ONE)
+     f = -FIVE
+     f = a - f
+  end function f
+  function g()
+     integer :: g(ONE)
+     g = -FIVE
+     g = foo_a - g
+  end function g
+  function h()
+     integer :: h(ONE)
+     h = -FIVE
+     h = FIVE - h
+  end function h
+  function i() result (h)
+     integer :: h(ONE)
+     h = -FIVE
+     h = FIVE - h
+  end function i
+  function j()
+     common /foo_bar/ cc
+     integer :: j(ONE), cc(ONE)
+     j = -FIVE
+     j = cc - j
+  end function j
+  subroutine aaa()
+    d = TEN - TWO
+! This aliases 'd' through 'get_d'.
+    d = bbb()
+    if (any (d .ne. check)) call myabort (8)
+  end subroutine aaa
+  function bbb()
+    integer :: bbb(ONE)
+    bbb = TWO
+    bbb = bbb + get_d()
+  end function bbb
+  function get_d()
+    integer :: get_d(ONE)
+    get_d = d
+  end function get_d
+end program test
+! { dg-final { cleanup-modules "foo" } }