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* [Bug ada/61466] New: Array index check optimized away
@ 2014-06-10 20:11 simon at pushface dot org
2015-01-09 7:04 ` [Bug ada/61466] " simon at pushface dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: simon at pushface dot org @ 2014-06-10 20:11 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61466
Bug ID: 61466
Summary: Array index check optimized away
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ada
Assignee: unassigned at gcc dot gnu.org
Reporter: simon at pushface dot org
Created attachment 32916
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32916&action=edit
Source code (package spec/body, main procedure)
In the attached code, the index check in procedure Violate on the “Output: out
Arr” parameter is present with -O0 but is omitted with higher levels. This is
clearly visible with -gnatG:
-O0:
L_1 : for j in input'first .. input'last loop
B_2 : declare
[constraint_error when
not (integer(j) in modifier'first .. modifier'last)
"index check failed"]
product : constant integer := modifier (j);
begin
[constraint_error when
not (integer(j) in output'first .. output'last)
"index check failed"]
output (j) := product / 2;
end B_2;
end loop L_1;
-O1:
L_1 : for j in input'first .. input'last loop
B_2 : declare
[constraint_error when
not (integer(j) in modifier'first .. modifier'last)
"index check failed"]
product : constant integer := modifier (j);
begin
output (j) := product / 2;
end B_2;
end loop L_1;
The bug is present at least in GCC 4.6 on Debian and GCC 4.7 .. 4.9 on Mac OS
X, also in GNAT GPL 2012 .. 2014.
>From gcc-bugs-return-453637-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jun 10 20:18:54 2014
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From: "simon at pushface dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/61027] gnatcmd gets SIGABRT during exception handling
Date: Tue, 10 Jun 2014 20:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61027
--- Comment #1 from simon at pushface dot org ---
Same problem with “gnatchop -h” (which, in this case, exits via an exception):
[...]
exception
when Types.Terminate_Program =>
null;
end Gnatchop;
>From gcc-bugs-return-453638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jun 10 21:15:39 2014
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From: "fdumont at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/29988] More stl_tree.h enhancements: improving operatorDate: Tue, 10 Jun 2014 21:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=29988
François Dumont <fdumont at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fdumont at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |fdumont at gcc dot gnu.org
Target Milestone|--- |4.10.0
--- Comment #1 from François Dumont <fdumont at gcc dot gnu.org> ---
I am working on a patch to reuse nodes. Not only for the copy assignment but
also for C++11 move assignment and assignment from initialization list.
>From gcc-bugs-return-453639-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jun 10 23:19:51 2014
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From: "P at draigBrady dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/53131] -Wlogical-op: ready for prime time in -Wall ?
Date: Tue, 10 Jun 2014 23:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idS131
Bug 53131 depends on bug 43772, which changed state.
Bug 43772 Summary: Errant -Wlogical-op warning when testing limits
https://gcc.gnu.org/bugzilla/show_bug.cgi?idC772
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug ada/61466] Array index check optimized away
2014-06-10 20:11 [Bug ada/61466] New: Array index check optimized away simon at pushface dot org
@ 2015-01-09 7:04 ` simon at pushface dot org
2015-01-09 12:16 ` [Bug ada/61466] array index check optimized away with optimization ebotcazou at gcc dot gnu.org
2015-02-05 11:41 ` ebotcazou at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: simon at pushface dot org @ 2015-01-09 7:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61466
--- Comment #1 from simon at pushface dot org ---
Still present in gcc version 5.0.0 20141228
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug ada/61466] array index check optimized away with optimization
2014-06-10 20:11 [Bug ada/61466] New: Array index check optimized away simon at pushface dot org
2015-01-09 7:04 ` [Bug ada/61466] " simon at pushface dot org
@ 2015-01-09 12:16 ` ebotcazou at gcc dot gnu.org
2015-02-05 11:41 ` ebotcazou at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2015-01-09 12:16 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61466
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-01-09
CC| |ebotcazou at gcc dot gnu.org
Summary|Array index check optimized |array index check optimized
|away |away with optimization
Ever confirmed|0 |1
--- Comment #2 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Ouch.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug ada/61466] array index check optimized away with optimization
2014-06-10 20:11 [Bug ada/61466] New: Array index check optimized away simon at pushface dot org
2015-01-09 7:04 ` [Bug ada/61466] " simon at pushface dot org
2015-01-09 12:16 ` [Bug ada/61466] array index check optimized away with optimization ebotcazou at gcc dot gnu.org
@ 2015-02-05 11:41 ` ebotcazou at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2015-02-05 11:41 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61466
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
URL| |https://gcc.gnu.org/ml/gcc-
| |patches/2015-02/msg00334.ht
| |ml
Resolution|--- |FIXED
Target Milestone|--- |5.0
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
This will be fixed in the upcoming 5.0 release.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2014-06-10 20:11 [Bug ada/61466] New: Array index check optimized away simon at pushface dot org
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2015-01-09 12:16 ` [Bug ada/61466] array index check optimized away with optimization ebotcazou at gcc dot gnu.org
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