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* [Bug fortran/54262] New: LOC shouldn't use copy-in/copy-out
@ 2012-08-14 20:49 burnus at gcc dot gnu.org
2012-08-15 8:12 ` [Bug fortran/54262] " burnus at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: burnus at gcc dot gnu.org @ 2012-08-14 20:49 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54262
Bug #: 54262
Summary: LOC shouldn't use copy-in/copy-out
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: burnus@gcc.gnu.org
With CONTIGUOUS, the following program assigns the address of x->data to the C
pointer. However, without CONTIGUOUS one gets a copy-in/copy-out.
Expected: Also without CONTIGUOUS, one obtains the x->data address – and no
array is packed.
The expected result is in line with F2008/TS29113's handling of C_LOC.
Implementation: It might be possible to generate an interface for LOC where the
dummy is of "type(*), dimension(..)" – that could be sufficient, but for
scalars it requires a wrapper.
Test case:
subroutine foo(x, p)
use iso_c_binding
type(*), target, CONTIGUOUS :: x(..) ! or x(:)
type(c_ptr) :: p
p = transfer (loc(x), p)
end subroutine foo
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug fortran/54262] LOC shouldn't use copy-in/copy-out
2012-08-14 20:49 [Bug fortran/54262] New: LOC shouldn't use copy-in/copy-out burnus at gcc dot gnu.org
@ 2012-08-15 8:12 ` burnus at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: burnus at gcc dot gnu.org @ 2012-08-15 8:12 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54262
Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |burnus at gcc dot gnu.org
--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-08-15 08:11:58 UTC ---
>From trans-intrinsics.c's gfc_conv_intrinsic_loc:
if (ss == gfc_ss_terminator)
gfc_conv_expr_reference (se, arg_expr);
else
gfc_conv_array_parameter (se, arg_expr, ss, true, NULL, NULL, NULL);
The "true" is for "bool g77" which causes the copy-in/copy-out.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2012-08-14 20:49 [Bug fortran/54262] New: LOC shouldn't use copy-in/copy-out burnus at gcc dot gnu.org
2012-08-15 8:12 ` [Bug fortran/54262] " burnus at gcc dot gnu.org
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