[Bug tree-optimization/18892] New: missed SRA of a block copy

[pinskia at gcc dot gnu dot org]

The following function:
int f(int a)
{
  int i = a & -129;
  return i == 144;
}
Should be compiled to:
int f1(int a)
{
  return (a & -129) == 144; // aka return 0;
}

Yes this shows up in real code (gcc), found while testing out my tree combiner.

-- 
           Summary: missed SRA of a block copy
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org
 BugsThisDependsOn: 15459


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18892