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* [Bug libgcc/67379] New: libgcc2.c negation of -2147483648 cannot be represented in type 'int'
@ 2015-08-28 8:39 zeccav at gmail dot com
2015-08-28 9:32 ` [Bug libgcc/67379] " rguenth at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: zeccav at gmail dot com @ 2015-08-28 8:39 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67379
Bug ID: 67379
Summary: libgcc2.c negation of -2147483648 cannot be
represented in type 'int'
Product: gcc
Version: 5.2.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: libgcc
Assignee: unassigned at gcc dot gnu.org
Reporter: zeccav at gmail dot com
Target Milestone: ---
In libgcc2.c:1842
int m;
unsigned int n = m < 0 ? -m : m;
when m==-2147483648
I get the following message from the sanitizer
/home/vitti/gcc-5.2.0/libgcc/libgcc2.c:1842:31: runtime error: negation of
-2147483648 cannot be represented in type 'int'; cast to an unsigned type to
negate this value to itself
I suggest changing the line to the correct version
unsigned int n = m < 0 ? - (unsigned int) m : m;
to avoid undefinite behaviour
This is running the gfortran testsuite file integer_exponentiation_1.f90
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug libgcc/67379] libgcc2.c negation of -2147483648 cannot be represented in type 'int' 2015-08-28 8:39 [Bug libgcc/67379] New: libgcc2.c negation of -2147483648 cannot be represented in type 'int' zeccav at gmail dot com @ 2015-08-28 9:32 ` rguenth at gcc dot gnu.org 2015-09-07 7:40 ` zeccav at gmail dot com 2021-02-27 8:48 ` zeccav at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu.org @ 2015-08-28 9:32 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67379 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2015-08-28 Ever confirmed|0 |1 --- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libgcc/67379] libgcc2.c negation of -2147483648 cannot be represented in type 'int' 2015-08-28 8:39 [Bug libgcc/67379] New: libgcc2.c negation of -2147483648 cannot be represented in type 'int' zeccav at gmail dot com 2015-08-28 9:32 ` [Bug libgcc/67379] " rguenth at gcc dot gnu.org @ 2015-09-07 7:40 ` zeccav at gmail dot com 2021-02-27 8:48 ` zeccav at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: zeccav at gmail dot com @ 2015-09-07 7:40 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67379 --- Comment #2 from Vittorio Zecca <zeccav at gmail dot com> --- There is a similar bug in gcc/function.c:254 unsigned HOST_WIDE_INT size = FRAME_GROWS_DOWNWARD ? -offset : offset; when offset == -9223372036854775808 Should I open a new bug? ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug libgcc/67379] libgcc2.c negation of -2147483648 cannot be represented in type 'int' 2015-08-28 8:39 [Bug libgcc/67379] New: libgcc2.c negation of -2147483648 cannot be represented in type 'int' zeccav at gmail dot com 2015-08-28 9:32 ` [Bug libgcc/67379] " rguenth at gcc dot gnu.org 2015-09-07 7:40 ` zeccav at gmail dot com @ 2021-02-27 8:48 ` zeccav at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: zeccav at gmail dot com @ 2021-02-27 8:48 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67379 Vittorio Zecca <zeccav at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |FIXED Status|NEW |RESOLVED --- Comment #3 from Vittorio Zecca <zeccav at gmail dot com> --- Fixed in bug 99236. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-02-27 8:48 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-08-28 8:39 [Bug libgcc/67379] New: libgcc2.c negation of -2147483648 cannot be represented in type 'int' zeccav at gmail dot com 2015-08-28 9:32 ` [Bug libgcc/67379] " rguenth at gcc dot gnu.org 2015-09-07 7:40 ` zeccav at gmail dot com 2021-02-27 8:48 ` zeccav at gmail dot com
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