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* [Bug tree-optimization/64739] New: Spurious "array subscript is above array bounds" warning
@ 2015-01-23 7:39 siddhesh at redhat dot com
2015-01-23 19:15 ` [Bug tree-optimization/64739] " rth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: siddhesh at redhat dot com @ 2015-01-23 7:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64739
Bug ID: 64739
Summary: Spurious "array subscript is above array bounds"
warning
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: siddhesh at redhat dot com
Reduced Reproducer:
$ cat foo.c
void
foo (char **inptrp, char *inend, int *wch, int *cnt)
{
int inlen = *cnt & 7;
if (inlen != 0)
{
char *inptr = *inptrp;
char bytebuf[4];
while (inptr < inend)
bytebuf[inlen++] = *inptr++;
*cnt = &bytebuf[inlen] - inptr;
*wch = *inptr;
}
}
$ gcc -O3 -Wall -o foo.s -S foo.c
foo.c: In function ‘foo’:
foo.c:11:16: warning: array subscript is above array bounds [-Warray-bounds]
bytebuf[inlen++] = *inptr++;
^
The warning disappears when one adds -fno-tree-vrp to the compile command.
The actual error appears when building the iconv bits in glibc.
>From gcc-bugs-return-474491-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Jan 23 08:13:57 2015
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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ada/64712] [5 Regression] FAIL: gnat.dg/unchecked_convert1.adb execution test (x86_64/-m32)
Date: Fri, 23 Jan 2015 08:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd712
Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed|2015-01-22 00:00:00 |2015-01-23
Ever confirmed|0 |1
--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
It's an uninitialized local variable.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/64739] Spurious "array subscript is above array bounds" warning
2015-01-23 7:39 [Bug tree-optimization/64739] New: Spurious "array subscript is above array bounds" warning siddhesh at redhat dot com
@ 2015-01-23 19:15 ` rth at gcc dot gnu.org
2015-01-26 13:07 ` izamyatin at gmail dot com
2015-01-28 22:15 ` rth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rth at gcc dot gnu.org @ 2015-01-23 19:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64739
Richard Henderson <rth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-01-23
CC| |rth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Henderson <rth at gcc dot gnu.org> ---
This seems to be related to induction variable elimination in some way,
because the VR for the offending unrolled iteration is [4,10].
Which is clearly silly.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/64739] Spurious "array subscript is above array bounds" warning
2015-01-23 7:39 [Bug tree-optimization/64739] New: Spurious "array subscript is above array bounds" warning siddhesh at redhat dot com
2015-01-23 19:15 ` [Bug tree-optimization/64739] " rth at gcc dot gnu.org
@ 2015-01-26 13:07 ` izamyatin at gmail dot com
2015-01-28 22:15 ` rth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: izamyatin at gmail dot com @ 2015-01-26 13:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64739
Igor Zamyatin <izamyatin at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |izamyatin at gmail dot com
--- Comment #2 from Igor Zamyatin <izamyatin at gmail dot com> ---
Looks quite similar to PR64277
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug tree-optimization/64739] Spurious "array subscript is above array bounds" warning
2015-01-23 7:39 [Bug tree-optimization/64739] New: Spurious "array subscript is above array bounds" warning siddhesh at redhat dot com
2015-01-23 19:15 ` [Bug tree-optimization/64739] " rth at gcc dot gnu.org
2015-01-26 13:07 ` izamyatin at gmail dot com
@ 2015-01-28 22:15 ` rth at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: rth at gcc dot gnu.org @ 2015-01-28 22:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64739
Richard Henderson <rth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Richard Henderson <rth at gcc dot gnu.org> ---
Yes indeed, this does seem to have been fixed along with 64277.
*** This bug has been marked as a duplicate of bug 64277 ***
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-01-28 22:15 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2015-01-23 7:39 [Bug tree-optimization/64739] New: Spurious "array subscript is above array bounds" warning siddhesh at redhat dot com
2015-01-23 19:15 ` [Bug tree-optimization/64739] " rth at gcc dot gnu.org
2015-01-26 13:07 ` izamyatin at gmail dot com
2015-01-28 22:15 ` rth at gcc dot gnu.org
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