[Bug tree-optimization/25528] New: missed LIM on the tree level (complex types)

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

Take the following code:
int f(void)
{
  static _Complex double t;
  int i, j;
  for(i = 0;i<2;i++)
    for(j = 0;j<2;j++)
      t *= .5 * 1.0;
  return t;
}

---
At -O1, we get on the tree level for the loop:
<L7>:;
  CI.33 = IMAGPART_EXPR <t> * 5.0e-1;
  REALPART_EXPR <t> = REALPART_EXPR <t> * 5.0e-1;
  IMAGPART_EXPR <t> = CI.33;
  REALPART_EXPR <t> = REALPART_EXPR <t> * 5.0e-1;
  IMAGPART_EXPR <t> = CI.33 * 5.0e-1;
  i = i + 1;
  if (i != 2) goto <L7>; else goto <L5>;

The stores to t is not pulled at all out of the loop.


-- 
           Summary: missed LIM on the tree level (complex types)
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, TREE
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25528