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* [Bug fortran/31014] New: missed-optimization: unnecessary invokation of _gfortran_internal_pack
@ 2007-03-01 17:55 burnus at gcc dot gnu dot org
2007-03-01 19:22 ` [Bug fortran/31014] " burnus at gcc dot gnu dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: burnus at gcc dot gnu dot org @ 2007-03-01 17:55 UTC (permalink / raw)
To: gcc-bugs
Calling _gfortran_internal_pack is not needed, if it is clear that the array is
contiguous. If it is further known that the called procedure uses
dimension(*), the creation of the array struct is also unnessarily.
In the following, the _gfortran_internal_pack call itself is unneeded:
external foo
! At compile-time known bounds, could be a local or dummy variable
! Could also be the dummy argument "a(*)",
! if one specifies below the bounds "a(1:<some value>[:1])"
real :: a(2:12)
call foo( a(:) )
call foo( a(2:) )
call foo( a(:12) )
call foo( a(2:12:1) )
The current tree looks like:
struct array1_real4 parm.0;
parm.0.dtype = 281;
[...] // Initialize array struct, OK!
D.1362 = _gfortran_internal_pack (&parm.0);
foo (D.1362);
_gfortran_internal_unpack (&parm.0, D.1362);
_gfortran_internal_free (D.1362);
The last four lines can be replaced by a simple "foo(&parm.0)".
Note that for one dimension, even
call foo (a(2:5) ) ! reduced ubound
or
call foo ( a(4:)) ! increased lbound
are possible without needing _gfortran_internal_pack.
If one knows that the called subroutine takes dimension(*) then there is also
no need to fill the array struct:
interface
subroutine foo(x)
real :: x(*)
end subroutine foo
end interface
real :: a(*) ! Can also be, e.g. "a(1:12)"
call foo(a(2:5:1))
end subroutine
Here, one can simply call
foo(&a[1])
instead of filling the array struct and calling then _gfortran_internal_pack.
--
Summary: missed-optimization: unnecessary invokation of
_gfortran_internal_pack
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: enhancement
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: burnus at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31014
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug fortran/31014] missed-optimization: unnecessary invokation of _gfortran_internal_pack
2007-03-01 17:55 [Bug fortran/31014] New: missed-optimization: unnecessary invokation of _gfortran_internal_pack burnus at gcc dot gnu dot org
@ 2007-03-01 19:22 ` burnus at gcc dot gnu dot org
2007-03-01 19:36 ` tkoenig at gcc dot gnu dot org
2010-02-20 22:17 ` burnus at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: burnus at gcc dot gnu dot org @ 2007-03-01 19:22 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from burnus at gcc dot gnu dot org 2007-03-01 19:22 -------
And analogously for these kinds of dummy arguments:
subroutine x(a,n)
integer :: n
real :: a(n)
interface
subroutine foo(x,n)
integer :: n
real :: x(n)
end subroutine foo
end interface
call foo(a(:),n)
end
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31014
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug fortran/31014] missed-optimization: unnecessary invokation of _gfortran_internal_pack
2007-03-01 17:55 [Bug fortran/31014] New: missed-optimization: unnecessary invokation of _gfortran_internal_pack burnus at gcc dot gnu dot org
2007-03-01 19:22 ` [Bug fortran/31014] " burnus at gcc dot gnu dot org
@ 2007-03-01 19:36 ` tkoenig at gcc dot gnu dot org
2010-02-20 22:17 ` burnus at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2007-03-01 19:36 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from tkoenig at gcc dot gnu dot org 2007-03-01 19:36 -------
Confirmed.
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2007-03-01 19:36:13
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31014
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug fortran/31014] missed-optimization: unnecessary invokation of _gfortran_internal_pack
2007-03-01 17:55 [Bug fortran/31014] New: missed-optimization: unnecessary invokation of _gfortran_internal_pack burnus at gcc dot gnu dot org
2007-03-01 19:22 ` [Bug fortran/31014] " burnus at gcc dot gnu dot org
2007-03-01 19:36 ` tkoenig at gcc dot gnu dot org
@ 2010-02-20 22:17 ` burnus at gcc dot gnu dot org
2 siblings, 0 replies; 4+ messages in thread
From: burnus at gcc dot gnu dot org @ 2010-02-20 22:17 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from burnus at gcc dot gnu dot org 2010-02-20 22:17 -------
Close as FIXED. Seemingly, the issues reported here are now fixed. Cf.
http://gcc.gnu.org/ml/fortran/2010-02/msg00162.html and PR 36932, PR 36933, PR
43072, and PR 43111.
--
burnus at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31014
^ permalink raw reply [flat|nested] 4+ messages in thread
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2007-03-01 17:55 [Bug fortran/31014] New: missed-optimization: unnecessary invokation of _gfortran_internal_pack burnus at gcc dot gnu dot org
2007-03-01 19:22 ` [Bug fortran/31014] " burnus at gcc dot gnu dot org
2007-03-01 19:36 ` tkoenig at gcc dot gnu dot org
2010-02-20 22:17 ` burnus at gcc dot gnu dot org
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