[Bug tree-optimization/39672] New: Local statics not promoted to const

[rguenth at gcc dot gnu dot org]

For

int foo(void)
{
  static int blah = 1;
  return blah;
}

we should be able to promote blah to TREE_READONLY during ipa-reference (or
local analysis) if blah does not have its address taken and is not written
to in the function body.

This occurs for example in 189.lucas via

        real(kind=r16), save :: mt,one=1,two=2,one_fourth,pi,theta,theta2

note the save attribute.


-- 
           Summary: Local statics not promoted to const
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39672