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* [Bug c/61903] New: signed integer overflow in expmed.c store_fixed_bit_filed_1
@ 2014-07-25 7:56 zeccav at gmail dot com
2014-07-25 8:03 ` [Bug c/61903] " zeccav at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: zeccav at gmail dot com @ 2014-07-25 7:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61903
Bug ID: 61903
Summary: signed integer overflow in expmed.c
store_fixed_bit_filed_1
Product: gcc
Version: 4.9.1
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: zeccav at gmail dot com
Compiling testsuite code pr28045.c the sanitizer claims that a signed integer
overflow occurs at expmed.c:1071
"../../gcc-4.9.1/gcc/expmed.c:1071:41: runtime error: signed integer overflow:
-9223372036854775808 + -1 cannot be represented in type 'long int'"
The offending instruction is
"v &= ((HOST_WIDE_INT) 1 << bitsize) - 1;"
This is in store_fixed_bit_field_1 on x86-64.
^ permalink raw reply [flat|nested] 5+ messages in thread* [Bug c/61903] signed integer overflow in expmed.c store_fixed_bit_filed_1 2014-07-25 7:56 [Bug c/61903] New: signed integer overflow in expmed.c store_fixed_bit_filed_1 zeccav at gmail dot com @ 2014-07-25 8:03 ` zeccav at gmail dot com 2014-07-25 8:10 ` [Bug middle-end/61903] " pinskia at gcc dot gnu.org ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: zeccav at gmail dot com @ 2014-07-25 8:03 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61903 --- Comment #1 from Vittorio Zecca <zeccav at gmail dot com> --- Same runtime error at line 1076 of expmed.c "&& v == ((HOST_WIDE_INT) 1 << bitsize) - 1)" compiling pr28045.c ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/61903] signed integer overflow in expmed.c store_fixed_bit_filed_1 2014-07-25 7:56 [Bug c/61903] New: signed integer overflow in expmed.c store_fixed_bit_filed_1 zeccav at gmail dot com 2014-07-25 8:03 ` [Bug c/61903] " zeccav at gmail dot com @ 2014-07-25 8:10 ` pinskia at gcc dot gnu.org 2014-09-01 9:19 ` mpolacek at gcc dot gnu.org 2014-09-01 9:22 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu.org @ 2014-07-25 8:10 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61903 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2014-07-25 Component|c |middle-end Ever confirmed|0 |1 --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- if (bitsize < HOST_BITS_PER_WIDE_INT) v &= ((HOST_WIDE_INT) 1 << bitsize) - 1; Should be an easy fix to change HOST_WIDE_INT to unsigned HOST_WIDE_INT. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/61903] signed integer overflow in expmed.c store_fixed_bit_filed_1 2014-07-25 7:56 [Bug c/61903] New: signed integer overflow in expmed.c store_fixed_bit_filed_1 zeccav at gmail dot com 2014-07-25 8:03 ` [Bug c/61903] " zeccav at gmail dot com 2014-07-25 8:10 ` [Bug middle-end/61903] " pinskia at gcc dot gnu.org @ 2014-09-01 9:19 ` mpolacek at gcc dot gnu.org 2014-09-01 9:22 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: mpolacek at gcc dot gnu.org @ 2014-09-01 9:19 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61903 --- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Author: mpolacek Date: Mon Sep 1 09:18:43 2014 New Revision: 214781 URL: https://gcc.gnu.org/viewcvs?rev=214781&root=gcc&view=rev Log: PR middle-end/61903 * expmed.c (store_fixed_bit_field_1): Shift UHWI 1 instead of HWI 1. Change the type of V to unsigned HOST_WIDE_INT. Modified: trunk/gcc/ChangeLog trunk/gcc/expmed.c ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug middle-end/61903] signed integer overflow in expmed.c store_fixed_bit_filed_1 2014-07-25 7:56 [Bug c/61903] New: signed integer overflow in expmed.c store_fixed_bit_filed_1 zeccav at gmail dot com ` (2 preceding siblings ...) 2014-09-01 9:19 ` mpolacek at gcc dot gnu.org @ 2014-09-01 9:22 ` mpolacek at gcc dot gnu.org 3 siblings, 0 replies; 5+ messages in thread From: mpolacek at gcc dot gnu.org @ 2014-09-01 9:22 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61903 Marek Polacek <mpolacek at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |mpolacek at gcc dot gnu.org Resolution|--- |FIXED Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org Target Milestone|--- |5.0 --- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> --- Fixed. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-09-01 9:22 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-07-25 7:56 [Bug c/61903] New: signed integer overflow in expmed.c store_fixed_bit_filed_1 zeccav at gmail dot com 2014-07-25 8:03 ` [Bug c/61903] " zeccav at gmail dot com 2014-07-25 8:10 ` [Bug middle-end/61903] " pinskia at gcc dot gnu.org 2014-09-01 9:19 ` mpolacek at gcc dot gnu.org 2014-09-01 9:22 ` mpolacek at gcc dot gnu.org
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