[Bug tree-optimization/28230] [4.2 Regression] -O2 -fwrapv miscompiles gcc, binutils, gzip.

[pinskia at gcc dot gnu dot org]

------- Comment #12 from pinskia at gcc dot gnu dot org  2006-09-21 03:37 
-------
Actually note here is one for 32bit targets also:
void foo( unsigned long long bb, unsigned short tn, unsigned e, unsigned* w );
void foo( unsigned long long bb, unsigned short tn, unsigned e, unsigned* w )
{
        unsigned n = tn + bb;
        do {
                e = (e > n) ? e : *w;
                n -= (e > n) ? n : e;
                if (*w)
                        *w = 0;
        } while ( n );
}
int main()
{
        unsigned w = 0;
        foo( 0, 0, 0, &w );
        return 0;
}


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |blocker
  GCC build triplet|x86-64-linux                |
   GCC host triplet|x86-64-linux                |
 GCC target triplet|x86-64-linux                |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28230