[Bug rtl-optimization/21485] BYTEmark numsort: performance regression 3.4.3 -> 4.0.0 with -O3 optimization

["steven at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From steven at gcc dot gnu dot org  2005-05-10 09:46 -------
This is the function (reindented) where we spend almost all of our time: 
 
void 
NumSift (long *array, unsigned long i, unsigned long j) 
{ 
  unsigned long k; 
  long temp; 
  while ((i + i) <= j) 
    { 
      k = i + i; 
      if (k < j) 
        if (array[k] < array[k + 1L]) 
          ++k; 
      if (array[i] < array[k]) 
        { 
          temp = array[k]; 
          array[k] = array[i]; 
          array[i] = temp; 
          i = k; 
        } 
      else 
        i = j + 1; 
    } 
  return; 
} 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21485