From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 19991 invoked by alias); 14 Mar 2014 16:51:17 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 19927 invoked by uid 48); 14 Mar 2014 16:51:13 -0000 From: "manu at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/60517] warning/error for taking address of member of a temporary object Date: Fri, 14 Mar 2014 16:51:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 4.9.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: manu at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-03/txt/msg01177.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D60517 --- Comment #7 from Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez --- (In reply to Marc Glisse from comment #6) > (In reply to Marc Glisse from comment #5) > > I would need a different (middle-end) warning that > > detects return &local_var, >=20 > To confirm this, I looked at the last dangling reference I debugged, > recompiled it with -O3 -fkeep-inline-functions, and a grep for "return &"= in > the .optimized dump showed: > return &one; > return &one; > return &D.495451.c_; > (where "one" is a global variable, but D.495451 is a local variable) > so even this trivial version of the warning would be useful. To avoid duplicates, the front-end could just return something else, like N= ULL, when it detects this case (I guess the behavior is undefined and we can do whatever we want, no?). >>From gcc-bugs-return-446309-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Mar 14 16:59:23 2014 Return-Path: Delivered-To: listarch-gcc-bugs@gcc.gnu.org Received: (qmail 25017 invoked by alias); 14 Mar 2014 16:59:23 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Delivered-To: mailing list gcc-bugs@gcc.gnu.org Received: (qmail 24969 invoked by uid 48); 14 Mar 2014 16:59:20 -0000 From: "sje at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/60528] New: MIPS GCC puts out complex constant incorrectly when in big-endian mode Date: Fri, 14 Mar 2014 16:59:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: unknown X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: sje at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter cc cf_gcctarget Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-03/txt/msg01178.txt.bz2 Content-length: 1510 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60528 Bug ID: 60528 Summary: MIPS GCC puts out complex constant incorrectly when in big-endian mode Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: sje at gcc dot gnu.org CC: rsandifo at gcc dot gnu.org Target: mips-*-* The included test program prints out: x = 0.634964 1.298458 x = inf inf on MIPS instead of: x = 0.634964 1.298458 x = 0.182506 1.163916 To reproduce the problem you need to compile the program with no optimization (-O0) and in big-endian mode. Little endian mode seems fine. When I compare the assembly language output to an earlier 4.8.1 GCC, the latest GCC output contains the following code to store the complex constant passed in to csinh: $LC0: .word 1071927711 .word 3624173458 .word 1073006203 .word 1962331215 Earlier GCC compilers that worked contained: $LC0: .word 1071927711 .word -670793838 .word 1073006203 .word 1962331215 Test case: #include #include #include int main() { double complex x; x = 0.63496391478473613 + 1.2984575814159773I; printf("x = %f %f\n", creal(x), cimag(x)); x = csinh(x); printf("x = %f %f\n", creal(x), cimag(x)); return 0; }