[Bug tree-optimization/43627] [4.5 Regression] slow compilation (tree canonical iv takes 75%)

[rguenth at gcc dot gnu dot org]

------- Comment #15 from rguenth at gcc dot gnu dot org  2010-04-02 14:39 
-------
C testcase for the missed VRP, fails with long on x86_64 only, with
long long also on i?86:

extern void link_error (void) __attribute__((noreturn));
int n;
float *x;
int main()
{
  if (n > 0)
    {
      int i = 0;
      do
        {
          long index;
          i = i + 1;
          index = i;
          if (index <= 0)
            link_error ();
          x[index] = 0;
          i = i + 1;
          index = i;
          if (index <= 0)
            link_error ();
          x[index] = 0;
        }
      while (i < n);
    }
}


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43627