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* [Bug fortran/47386] New: Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized]
@ 2011-01-20 22:02 anlauf at gmx dot de
2011-01-20 22:03 ` [Bug middle-end/47386] " pinskia at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: anlauf at gmx dot de @ 2011-01-20 22:02 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47386
Summary: Wrong warning: ‘w.dim[2].stride’ may be used
uninitialized in this function [-Wuninitialized]
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: anlauf@gmx.de
Hi.
the following testcase demonstrates warnings that can be irritating:
% cat gfcbug112.f90
module gfcbug112
implicit none
logical :: ll = .false.
contains
subroutine calc_W (N, M)
integer, intent(in) :: N, M
real :: T(N,M,M) ! Temporary array 1
real, allocatable :: W(:,:,:) ! Temporary array 2
if(ll) then
allocate (W(N,M,M))
end if
T=0
if(ll) then
W = 0
deallocate (W)
end if
end subroutine calc_W
end module gfcbug112
% gfc-trunk -c -Wall -O gfcbug112.f90
gfcbug112.f90: In function ‘calc_w’:
gfcbug112.f90:5:0: warning: ‘w.dim[2].stride’ may be used uninitialized in this
function [-Wuninitialized]
One can get really many of these in large modules...
Harald
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/47386] Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized]
2011-01-20 22:02 [Bug fortran/47386] New: Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized] anlauf at gmx dot de
@ 2011-01-20 22:03 ` pinskia at gcc dot gnu.org
2011-01-21 11:50 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2011-01-20 22:03 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47386
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|fortran |middle-end
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-01-20 21:21:58 UTC ---
This is the "standard" uninitialized warning for predicates. There are a few
other bugs like this.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/47386] Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized]
2011-01-20 22:02 [Bug fortran/47386] New: Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized] anlauf at gmx dot de
2011-01-20 22:03 ` [Bug middle-end/47386] " pinskia at gcc dot gnu.org
@ 2011-01-21 11:50 ` rguenth at gcc dot gnu.org
2021-04-15 0:46 ` msebor at gcc dot gnu.org
2022-08-29 13:44 ` [Bug tree-optimization/47386] " rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-01-21 11:50 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47386
Richard Guenther <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2011.01.21 11:12:28
Ever Confirmed|0 |1
--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-01-21 11:12:28 UTC ---
Confirmed.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/47386] Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized]
2011-01-20 22:02 [Bug fortran/47386] New: Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized] anlauf at gmx dot de
2011-01-20 22:03 ` [Bug middle-end/47386] " pinskia at gcc dot gnu.org
2011-01-21 11:50 ` rguenth at gcc dot gnu.org
@ 2021-04-15 0:46 ` msebor at gcc dot gnu.org
2022-08-29 13:44 ` [Bug tree-optimization/47386] " rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-04-15 0:46 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47386
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2011-01-21 11:12:28 |2021-4-14
Blocks| |24639
CC| |msebor at gcc dot gnu.org
Known to fail| |10.2.0, 11.0, 4.6.0, 4.8.4,
| |4.9.4, 5.5.0, 6.4.0, 7.2.0,
| |8.3.0, 9.1.0
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Reconfirmed with GCC 11 and the output below.
$ gcc -O2 -S -Wall pr47386.f90
pr47386.f90:9:35:
9 | real, allocatable :: W(:,:,:) ! Temporary array 2
| ^
Warning: ‘w.dim[1].stride’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
pr47386.f90:18:12:
18 | W = 0
| ^
Warning: ‘w.dim[0].ubound’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
pr47386.f90:9:35:
9 | real, allocatable :: W(:,:,:) ! Temporary array 2
| ^
Warning: ‘w.dim[2].ubound’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
pr47386.f90:9:35: Warning: ‘w.offset’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
pr47386.f90:9:35: Warning: ‘w.dim[2].stride’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
pr47386.f90:9:35: Warning: ‘w.dim[1].ubound’ may be used uninitialized in this
function [-Wmaybe-uninitialized]
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24639
[Bug 24639] [meta-bug] bug to track all Wuninitialized issues
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug tree-optimization/47386] Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized]
2011-01-20 22:02 [Bug fortran/47386] New: Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized] anlauf at gmx dot de
` (2 preceding siblings ...)
2021-04-15 0:46 ` msebor at gcc dot gnu.org
@ 2022-08-29 13:44 ` rguenth at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-08-29 13:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47386
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |12.2.0
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Re-confirmed with GCC 12 and trunk. We diagnose a use of w.dim[1].ubound
conditional on ubound.1 > 0 && ll == 0. I believe we're jump-threading
if (ll) around the T = 0 stmt and then mixing up paths. -fno-thread-jumps
fixes
the thing.
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-08-29 13:44 UTC | newest]
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2011-01-20 22:02 [Bug fortran/47386] New: Wrong warning: ‘w.dim[2].stride’ may be used uninitialized in this function [-Wuninitialized] anlauf at gmx dot de
2011-01-20 22:03 ` [Bug middle-end/47386] " pinskia at gcc dot gnu.org
2011-01-21 11:50 ` rguenth at gcc dot gnu.org
2021-04-15 0:46 ` msebor at gcc dot gnu.org
2022-08-29 13:44 ` [Bug tree-optimization/47386] " rguenth at gcc dot gnu.org
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