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Date: Mon, 03 Jun 2002 04:46:00 -0000
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From: Michael Veksler <veksler@il.ibm.com>
Subject: Re: c++/6914: -O2 and -O give different results for the same valid
 FP code
Reply-To: Michael Veksler <veksler@il.ibm.com>
X-SW-Source: 2002-06/txt/msg00057.txt.bz2
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The following reply was made to PR c++/6914; it has been noted by GNATS.

From: Michael Veksler <veksler@il.ibm.com>
To: gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, veksler@il.ibm.com,
   gcc-bugs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:  
Subject: Re: c++/6914: -O2 and -O give different results for the same valid
 FP code
Date: Mon, 03 Jun 2002 14:47:32 +0300

 http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6914
 
 I managed to simplify this example, to a trivial C code.
 Please change category to C
 
 -------------- simplified example ----------
 double f();
 
 int main()
 {
     double a = 1.0 / f();
     double b = 1.0 / f();
 
     if(a < b)
          return 1;
 
     return 0;
 }
 
 double f() { return 3; }
 ----------- end example ----------
 
 The exit status of the resulting executable should be 0, but when compiled
 with -O2 it is 1.