[Bug fortran/59026] New: ELEMENTAL procedure with VALUE arguments emits wrong code
fxcoudert at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Nov 6 19:52:00 GMT 2013
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59026
Bug ID: 59026
Summary: ELEMENTAL procedure with VALUE arguments emits wrong
code
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: fxcoudert at gcc dot gnu.org
The following source is compiled into wrong code:
interface
elemental integer function foo(x)
integer, intent(in), value :: x
end function
end interface
print *, foo(42)
print *, foo([0,1])
end
For all versions of gfortran starting from 4.3 (and up to current trunk), the
second call to FOO is miscompiled. Looking at the generated code
(-fdump-tree-original), the first call is, as expected, by value:
D.1882 = foo (42);
_gfortran_transfer_integer_write (&dt_parm.0, &D.1882, 4);
while the second call is by-reference:
D.1887 = A.2[S.3];
D.1888 = foo (&D.1887);
_gfortran_transfer_integer_write (&dt_parm.1, &D.1888, 4);
This can be confirmed by adding an actual FOO function such as:
elemental integer function foo(x)
integer, intent(in), value :: x
foo = x - 1
end function
Running the complete program then yields:
41
1370438451 1370438451
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