Re: c++/3594: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8

Re: c++/3594: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8

[davem]

Synopsis: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8

State-Changed-From-To: analyzed->closed
State-Changed-By: davem
State-Changed-When: Fri May  3 14:49:01 2002
State-Changed-Why:
    Since it is fixed in current sources, it is
    closed.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=3594

Re: c++/3594: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8

[ciceron]

Synopsis: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8

State-Changed-From-To: open->analyzed
State-Changed-By: ciceron
State-Changed-When: Thu Nov 29 03:46:12 2001
State-Changed-Why:
    confirmed as bug for 2.95.3
    fixed in 3.0.2 and 3.1

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=3594&database=gcc

Re: c++/3594: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8

[ciceron]

The following reply was made to PR c++/3594; it has been noted by GNATS.

From: ciceron@gcc.gnu.org
To: andreas@dwl.co.uk, gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org,
  gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:  
Subject: Re: c++/3594: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8
Date: 29 Nov 2001 11:46:13 -0000

 Synopsis: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8
 
 State-Changed-From-To: open->analyzed
 State-Changed-By: ciceron
 State-Changed-When: Thu Nov 29 03:46:12 2001
 State-Changed-Why:
     confirmed as bug for 2.95.3
     fixed in 3.0.2 and 3.1
 
 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&pr=3594&database=gcc

c++/3594: (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8

[andreas]

>Number:         3594
>Category:       c++
>Synopsis:       (<expr != 0) != 0 bad code with -O2 under sparc solaris 2.8
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 06 08:26:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Andreas Damm
>Release:        2.95.3
>Organization:
>Environment:
sparc-sun-solaris2.8
>Description:
When compiling the test program with c++ -O2, the last assembly command is left of in the generated code (and x, 1, x) which leads to incorrect results.
Compiling with gcc is OK. So is leaving of the != 0.
Function foo is one line: return FD_ISSET(fd, fdset) != 0;
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="bug.ii.bz2"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="bug.ii.bz2"
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