Re: c++/5494: ((++a)+(++a)) yeilds 4 on x86, but 3 on everything else.

Re: c++/5494: ((++a)+(++a)) yeilds 4 on x86, but 3 on everything else.

[ljrittle]

Synopsis: ((++a)+(++a)) yeilds 4 on x86, but 3 on everything else.

State-Changed-From-To: open->closed
State-Changed-By: ljrittle
State-Changed-When: Fri Jan 25 16:00:59 2002
State-Changed-Why:
    Not a compiler bug.
    
    There are zero sequence points within this expression:
    
    ((++a)+(++a))
    
    In semi-layman's terms, prefix and postfix ++/-- may
    only be used once per object per pair of consecutive
    sequence points.
    
    If you don't know what a sequence point is, then please
    consult the C standard for more details...

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=5494

c++/5494: ((++a)+(++a)) yeilds 4 on x86, but 3 on everything else.

[carpman]

>Number:         5494
>Category:       c++
>Synopsis:       ((++a)+(++a)) yeilds 4 on x86, but 3 on everything else.
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 25 11:36:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Guild of the Void Pointer
>Release:        gcc 2.95.2
>Organization:
>Environment:
MAC OS X and Debian Linux.
>Description:
this code..

void main(void){
 int a=0;

 cout << ((++a)+(++a)) << endl; 
}

will produce 4 on x86, but 3 on every other arch I can test.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: