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* [Bug middle-end/97391] New: [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter
@ 2020-10-12 22:12 msebor at gcc dot gnu.org
2020-10-12 22:12 ` [Bug middle-end/97391] " msebor at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: msebor at gcc dot gnu.org @ 2020-10-12 22:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97391
Bug ID: 97391
Summary: [11 Regression] bogus -Warray-bounds accessing a
multidimensional array parameter
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
Both warnings below are incorrect.
$ cat xx.c && gcc -O2 -S -Wall xx.c
void f (char a[3][5])
{
for (int i = 0; i < 3; i++)
for (int j = 0; j < 5; j++)
a[i][j] = 0;
}
xx.c: In function ‘f’:
xx.c:5:8: warning: array subscript ‘char[5][0]’ is partly outside array bounds
of ‘char[3]’ [-Warray-bounds]
5 | a[i][j] = 0;
| ~^~~
xx.c:1:14: note: while referencing ‘a’
1 | void f (char a[3][5])
| ~~~~~^~~~~~~
xx.c:5:15: warning: ‘__builtin_memset’ forming offset [3, 14] is out of the
bounds [0, 3] [-Warray-bounds]
5 | a[i][j] = 0;
| ~~~~~~~~^~~
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/97391] [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter
2020-10-12 22:12 [Bug middle-end/97391] New: [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter msebor at gcc dot gnu.org
@ 2020-10-12 22:12 ` msebor at gcc dot gnu.org
2020-10-13 6:24 ` rguenth at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: msebor at gcc dot gnu.org @ 2020-10-12 22:12 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97391
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |56456
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
Keywords| |diagnostic
Last reconfirmed| |2020-10-12
Ever confirmed|0 |1
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Looks like a bug in gimple_parm_array_size() that computes the size of function
array parameters.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56456
[Bug 56456] [meta-bug] bogus/missing -Warray-bounds
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/97391] [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter
2020-10-12 22:12 [Bug middle-end/97391] New: [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter msebor at gcc dot gnu.org
2020-10-12 22:12 ` [Bug middle-end/97391] " msebor at gcc dot gnu.org
@ 2020-10-13 6:24 ` rguenth at gcc dot gnu.org
2020-10-14 21:37 ` cvs-commit at gcc dot gnu.org
2020-10-14 21:38 ` msebor at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-10-13 6:24 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97391
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |11.0
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/97391] [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter
2020-10-12 22:12 [Bug middle-end/97391] New: [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter msebor at gcc dot gnu.org
2020-10-12 22:12 ` [Bug middle-end/97391] " msebor at gcc dot gnu.org
2020-10-13 6:24 ` rguenth at gcc dot gnu.org
@ 2020-10-14 21:37 ` cvs-commit at gcc dot gnu.org
2020-10-14 21:38 ` msebor at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2020-10-14 21:37 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97391
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Sebor <msebor@gcc.gnu.org>:
https://gcc.gnu.org/g:14d83c6f584c321989b43526dc9437de4381aa47
commit r11-3901-g14d83c6f584c321989b43526dc9437de4381aa47
Author: Martin Sebor <msebor@redhat.com>
Date: Wed Oct 14 15:19:39 2020 -0600
PR middle-end/97391 - bogus -Warray-bounds accessing a multidimensional
array parameter
gcc/ChangeLog:
PR middle-end/97391
* builtins.c (gimple_parm_array_size): Peel off one less layer
of array types.
gcc/testsuite/ChangeLog:
PR middle-end/97391
* gcc.dg/Warray-bounds-68.c: New test.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/97391] [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter
2020-10-12 22:12 [Bug middle-end/97391] New: [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter msebor at gcc dot gnu.org
` (2 preceding siblings ...)
2020-10-14 21:37 ` cvs-commit at gcc dot gnu.org
@ 2020-10-14 21:38 ` msebor at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: msebor at gcc dot gnu.org @ 2020-10-14 21:38 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97391
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Fixed in r11-3901.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-10-12 22:12 [Bug middle-end/97391] New: [11 Regression] bogus -Warray-bounds accessing a multidimensional array parameter msebor at gcc dot gnu.org
2020-10-12 22:12 ` [Bug middle-end/97391] " msebor at gcc dot gnu.org
2020-10-13 6:24 ` rguenth at gcc dot gnu.org
2020-10-14 21:37 ` cvs-commit at gcc dot gnu.org
2020-10-14 21:38 ` msebor at gcc dot gnu.org
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