[Bug rtl-optimization/19001] New: Loops with power of two step and variable bounds not unrolled

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

Loop of the following form

int check(int a,int b, char *c)
{
for(;a<b;a+=4)
  if(c[a]==1) return a;
return a;
}

(with step being power of two and > 1, and bounds variable) does not get unrolled.
It may happen that this loop is infinite, but this should not prevent unrolling.

-- 
           Summary: Loops with power of two step and variable bounds not
                    unrolled
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: rakdver at gcc dot gnu dot org
        ReportedBy: rakdver at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19001